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Srithep, Yottha. "A study on material distribution, mechanical properties, and numerical simulation in co-injection molding." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1204150909.
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Kim, Nam Hyung. "INJECTION-COMPRESSION AND CO-INJECTION MOLDINGS OF AMORPHOUS POLYMERS: VISCOELASTIC SIMULATION AND EXPERIMENT." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1230065091.
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Dissertation (Ph. D.)--University of Akron, Dept. of Polymer Engineering, 2009."May, 2009." Title from electronic dissertation title page (viewed 11/27/2009) Advisor, Avraam I. Isayev; Committee members, James L. White, Erol Sancaktar, Kevin Kreider, Minel J. Braun; Department Chair, Sadhan C. Jana; Dean of the College, Stephen Cheng; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Tran, Ngoc Tu. "Creating material properties for thermoset injection molding simulation process." Universitätsverlag Chemnitz, 2019. https://monarch.qucosa.de/id/qucosa%3A38380.
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Um den Spritzgießprozess zu simulieren, sind korrekte Materialdaten nötig. Diese Daten umfassen Viskositätsmodelle, Wärmekapazitätskoeffizienten, Wärmeleitfähigkeitskoeffizienten, PVT-Modelle und bei reaktiven Materialien Härtungsmodelle. Bei der Spritzgießsimulation von Thermoplasten sind die Materialdaten in der Regel in den Simulationstools verfügbar. Der Anwender kann problemlos Thermoplastmaterialdaten auswählen, die bereits in die Materialdatenbank der Simulationswerkzeuge eingebettet waren, um die gesamten Phasen des Thermoplastspritzgießprozesses zu simulieren. Bei der Duroplastspritzgießsimulation sind nur begrenzt Materialdaten vorhanden und selten aus der Datenbank der Simulationswerkzeuge verfügbar, da sie nicht nur bei der Messung rheologischer und thermischer Eigenschaften, sondern auch bei der Modellierung rheologischer und kinetischer mathematischer Modelle kompliziert sind. Daher ist es notwendig, eigene Materialdaten zu generieren. Um dieses Problem zu lösen, bedarf es einer umfangreichen Wissensbasis bei der Messung von Materialeigenschaften sowie der Erstellung eines Optimierungsalgorithmus´. Um den Prozess des duroplastischen Spritzgießens exakt zu simulieren, bedarf es zudem fundierter Kenntnisse über die Formfüllungseigenschaften dieser Materialien. Die Untersuchung des Fließverhaltens von duroplastischen Spritzgießmassen im Inneren der Kavität ist jedoch nicht ausreichend beschrieben. Bisher gab es noch keine veröffentlichten Hinweise, die zeigen, wie man aus experimentellen Messdaten (thermische und rheologische Daten) für den reaktiven Spritzgießsimulationsprozess komplette Materialdaten für Duroplaste erzeugen kann. Diese Probleme führen zu einer Abhängigkeit der Anwender von der Materialdatenbank der Simulationssoftware, was zu einer Einschränkung der Anwendung der Computersimulation in der duroplastischen Spritzgießsimulation und dem Vergleich zwischen experimentellen und Simulationsergebnissen führt. Darüber hinaus stellt sich die Frage, ob es beim Füllen der Kavität ein Wandgleiten zwischen Duroplastschmelze und Wandoberfläche gibt oder nicht. Aus diesem Grund wird die Wirkung des Wandgleitens auf die Kavitätenoberfläche bei der Simulation des duroplastischen Spritzgießens immer noch vernachlässigt. Die vorliegende Arbeit konzentriert sich auf drei wichtige wissenschaftliche Ziele. Das erste ist die Innovation eines neuen technischen Verfahrens zur physikalischen Erklärung des Formfüllverhaltens von duroplastischen Spritzgießmassen. Das zweite Hauptziel ist die Entwicklung einer numerischen Methode zur Erstellung eines duroplastischen Materialdatenblattes zur Simulation der Formfüllung von duroplastischen Spritzgießmassen. Schließlich wird die Erstellung von Simulationswerkzeugen auf der Grundlage der physikalischen Gegebenheiten und des erzeugten Materialdatenblattes durchgeführt.To simulate the injection molding process, it is necessary to set material data. The material data for an injection molding process must include a viscosity model and its fitted coefficients, heat capacity coefficients, thermal conductivity coefficients, a PVT model and its coefficients, a curing model and its coefficients (only for reactive injection molding). With thermoplastics injection molding simulation, the material data is generally available from simulation tools. Users could easily choose thermoplastics material data that was already embedded in the material data bank of simulation tools to simulate the entire phases of thermoplastics injection molding process. However, with thermosets injection molding simulation, the material data is found in limited sources and seldom available from data bank of simulation tools because of complication not only in rheological and thermal properties measurement but also in modeling rheological and cure kinetics mathematical models. Therefore, with thermoset injection molding compounds that its material data bank has not been found in data bank of simulation tools, before setting material data, it is necessary to create its own material data that simulation packages do not supply a tool. Therefore, to solve this problem, it requires an extensive knowledge base in measurements of material properties as well as optimization algorithm. In addition, to simulate exactly the thermosets injection molding compound process, it requires a profound knowledge in the mold filling characteristics of thermoset injection molding compounds. However, investigation of flow behavior of thermosets injection molding compounds inside the mold has not been adequately described. Up to now, there has not been any article that shows a complete way to create thermoset material data from measured experimental data (thermal data and rheological data) for the reactive injection molding simulation process. These problems are leading to the users ‘dependency on the material data bank of simulation tools, leading to restriction in application of computer simulation in the thermoset injection molding simulation and comparison between experimental and simulation results. Furthermore, there is still a big question related to whether there is or no slip phenomenon between thermosets melt and the wall surface during filling the cavity, for which has not yet been found an exact answer. Because of this the effect of wall slip on the cavity surface is still ignored during thermoset injection molding simulation process. This thesis focused on three key scientific goals. The first one is innovation of a new technical method to explain the mold filling behavior of thermoset injection molding compounds physically. The second key goal is developing numerical method to create thermoset material data sheet for simulation of mold filling characterizations of thermoset injection molding compounds. Finally, creating a simulation tool base on the physical technique and generated material data sheet.
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Shi, Jianjun. "Experiment and simulation of micro injection molding and microwave sintering." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2064/document.
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Procédé de moulage par injection de poudres est constitué de quatre étapes principales: la préparation des matières premières, moulage par injection, le déliantage et le frittage. Cette thèse présente les recherches sur deux aspects principaux: la micro-injection et frittage par micro -ondes. Les contributions principaux peuvent être conclues dans les quatre aspects suivants: Modification et complément de l'algorithme précédent pour la simulation du procédé de moulage par injection; L'évaluation et la mise en œuvre de l'effet de tension de surface en simulation pour micro-injection; Micro-ondes expériences de frittage de compacts basés sur l'acier inoxydable 17-4PH; Réalisation de la simulation de frittage à micro-ondes avec couplage de la multi-physique, y compris le chauffage à micro-ondes classique, le transfert de chaleur, et le supplément de modèle pour la densification de frittage de la poudre compactéPowder Injection molding process consists off our main stages: feedstock preparation, injection molding, debinding and sintering. The thesis presents the research on two main aspects: micro injectionmolding and microwave sintering. The main contributions can be concluded in thefollowing four aspects: Modification and supplement of previous algorithm for the simulation ofinjection molding process; Evaluation and implementation of surface tension effect in simulation for micro injection; Microwave sintering experiments of compacts based on 17-4PH stainles ssteel; Realization of the microwave sintering simulation with the coupling of multi-physics,including the classic microwave heating, heat transfer, and the supplement of model for sintering densification of powder impacts
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Gydemo, Jessica. "Simulation of injection molded fiber reinforced polymers." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62758.
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Riddles, Mornay. "Prediction of shrinkage and warpage in injection moulded components using computational analysis." Thesis, Peninsula Technikon, 2003. http://hdl.handle.net/20.500.11838/1265.
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Thesis (MTech (Mechanical Engineering))--Peninsula Technikon, 2003Injection moulding is a process by which molten polymer is forced into an empty cavity of the desired shape. At its melting point, polymers undergo a volumetric expansion when heated, and volumetric contraction when cooled. This volumetric contraction is called shrinkage. Once the mould cavity is filled, more pressure is applied and additional polymer is packed into the cavity and held to compensate for the anticipated shrinkage as the polymer solidifies. The cooling takes place via the cooling channels where the polymer is cooled until a specific ejection criterion is met. Heat from the polymer is lost to the surrounding mould, a part of this heat reaches the cooling channel surfaces, which in turn exchange heat with the circulating cooling fluid. Due to the complexity of injection moulded parts and the cooling channel layout, it is difficult to achieve balanced cooling of parts. Asymmetric mould temperature distribution causes contractions of• the polymer as it cools from its melting temperature to room temperature. This results in residual stresses, which causes the part to warp after ejection. Given the understanding of the mathematical model describing the heat transfer process during the cooling stage, the objectives of this study were three fold. Firstly, an alternative numerical model for the heat transfer process was developed. The proposed model was used to investigate the cooling stress build-up during the injection moulding process.
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Jüttner, Gabor, Tham Nguyen-Chung, Günter Mennig, and Michael Gehde. "Simulation of the Filling Process in Micro-Injection Moulding." Universitätsbibliothek Chemnitz, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200801189.
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Nowadays, the filling and solidification of macro-scale injection mouldings can be predicted using commercial CAE software. For micro-injection moulding, the conventional tools do not work for all process conditions. The reasons might be the lack of high quality database used in the simulation and the improperly specified boundary conditions which do not reflect the real state in the cavity. Special aspects like surface tension or "size dependent" viscosity might also be responsible for the inaccuracy of the simulations.
In this paper, those aspects related to the boundary conditions were taken into consideration, especially the thermal contact behaviour and the melt compression in the barrel which affects not only the temperature of the melt due to the compression heating, but also reduces the actual volume rate in the cavity. It can be shown that the heat transfer coefficient between the melt and the mould wall has a significant influence on the simulation results. In combination with precise material data and considering the reduction of the volume rate due to the melt compression in the barrel, the heat transfer coefficient may be quantified by means of reverse engineering. In general, it decreases when either the cavity thickness or the injection speed increases. It is believed that a pressure dependent model for the heat transfer coefficient would be more suitable to describe the thermal contact behaviour in micro injection moulding. The melt compression in the barrel affects definitely the filling behaviour and subsequently the heat transfer in the cavity as well, which is especially true for micro parts of high aspect ratio.
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Kong, Xiangji. "Development and characterization of polymer- metallic powder feedstocks for micro-injection molding." Phd thesis, Université de Franche-Comté, 2011. http://tel.archives-ouvertes.fr/tel-00844736.
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Micro-Powder Injection Moulding (Micro-PIM) technology is one of the key technologies that permit to fit with the increasing demands for smaller parts associated to miniaturization and functionalization in different application fields. The thesis focuses first on the elaboration and characterization of polymer-powder mixtures based on 316L stainless steel powders, and then on the identification of physical and material parameters related to the sintering stage and to the numerical simulations of the sintering process. Mixtures formulation with new binder systems based on different polymeric components have been developed for 316L stainless steel powders (5 µm and 16 µm). The characterization of the resulting mixtures for each group is carried out using mixing torque tests and viscosity tests. The mixture associated to the formulation comprising polypropylene + paraffin wax + stearic acid is well adapted for both powders and has been retained in the subsequent tests, due to the low value of the mixing torque and shear viscosity. The critical powder volume loading with 316L stainless steel powder (5 µm) according to the retained formulation has been established to 68% using four different methods. Micro mono-material injection (with 316L stainless steel mélange) and bi-material injection (with 316L stainless steel mélange and Cu mélange) are properly investigated. Homogeneity tests are observed for mixtures before and after injection. A physical model well suited for sintering stage is proposed for the simulation of sintering stage. The identification of physical parameters associated to proposed model are defined from the sintering stages in considering 316L stainless steel (5 µm)mixtures with various powder volume loadings (62%, 64% and 66%). Beam-bending tests and free sintering tests and thermo-Mechanical-Analyses (TMA) have also investigated. Three sintering stages corresponding to heating rates at 5 °C/min, 10 °C/min and 15 °C/min are used during both beam-bending tests and free sintering tests. On basis of the results obtained from dilatometry measurements, the shear viscosity module G, the bulk viscosity module K and the sintering stress σs are identified using Matlab® software. Afterwards, the sintering model is implemented in the Abaqus® finite element code, and appropriate finite elements have been used for the support and micro-specimens, respectively. The physical material parameters resulting from the identification experiments are used to establish the proper 316L stainless steel mixture, in combination with G, K and σs parameters. Finally, the sintering stages up to 1200 °C with three heating rates (5 °C/min, 10 °C/min and 15 °C/min) are also simulated corresponding to the four micro-specimen types (powder volume loading of 62%, 64% and 66%). The simulated shrinkages and relative densities of the sintered micro-specimens are compared to the experimental results indicating a proper agreement
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Hernández, Aguilar José Ramón. "Computational and experimental evaluation of two models for the simulation of thermoplastics injection molding." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ64224.pdf.
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Carrillo, Antonio J. "Residual Stresses and Birefringence in Gas-assisted Injection Molding of Amorphous Polymers: Simulation and Experiment." University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1214313599.
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Liu, Yao. "Heat transfer process between polymer and cavity wall during injection molding." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-157361.
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Injection molding is one of the most commonly applied processing methods for plastic components. Heat transfer coefficient (HTC), which describes the heat conducting ability of the interface between a polymer and cavity wall, significantly influences the temperature distribution of a polymer and mold during injection molding and thus affects the process and quality of plastic products. This thesis focuses on HTC under diverse processing situations. On the basis of the heat conducting principle, a theoretical model for calculating HTC was presented. Injection mold specially used for measuring and calculating HTC was designed and fabricated. Experimental injection studies under different processing conditions, especially different surface roughness, were performed for acquiring necessary temperature data. The heat quantity across the interface and HTC between a polymer and cavity wall was calculated on the basis of experimental results. The influence of surface roughness on HTC during injection molding was investigated for the first time. The factors influencing the HTC were analyzed on the basis of the factor weight during injection molding. Subsequently FEM (Finite element method) simulations were carried out with observed and preset value of HTC respectively and the relative crystallinity and part density were obtained. In the comparison between results from simulation and experiment, the result calculated with observed HTC shows better agreement with actually measured value, which can verify the reliability and precision of the injection molding simulation with observed HTC. The results of this thesis is beneficial for understanding the heat transfer process comprehensively, predicting temperature distribution, arranging cooling system, reducing cycle time and improving precision of numerical simulationDas Spritzgießen ist eines der am häufigsten angewandten Verarbeitungsverfahren zur Herstellung von Kunststoffkomponenten. Der Wärmedurchgangskoeffizient (WDK), welcher den Wärmeübergang zwischen Kunststoff und Werkzeugwand beschreibt, beeinflusst während des Spritzgießens maßgeblich die Temperaturverteilung im Bauteil und dem Werkzeug und folglich den Prozess und die Qualität der Kunststoffprodukte. Der Inhalt dieser Arbeit beschäftigt sich mit dem WDK unter verschiedenen Prozessbedingungen. Auf Grundlage des Wärmeleitungsprinzips wurde ein theoretisches Modell für die Berechnung des WDK vorgestellt. Es wurde dazu ein Spritzgießwerkzeug konstruiert und hergestellt, welches Messungen zur späteren Berechnung des WDK ermöglicht. Praktische Spritzgießversuche unter verschiedenen Prozessbedingungen, insbesondere unterschiedlicher Oberflächenrauheit, wurden für die Erfassung der erforderlichen Temperaturdaten durchgeführt. Auf Grundlage der experimentellen Ergebnisse wurde der Wärmeübergang zwischen dem Polymer und der Werkzeugwand berechnet. Der Einfluss der Oberflächenrauhigkeit auf den WDK wurde hierbei zum ersten Mal untersucht. Auf Grundlage des Bauteilgewichtes wurden anschließend die Faktoren, die den WDK beeinflussen, berechnet. Des Weiteren wurden FEM-Simulationen (Finite Element Methode) mit dem gemessenen und dem voreingestellten WDK durchgeführt und daraus der Kristallinitätsgrad und die Bauteildichte gewonnen. Der Vergleich zwischen den realen Ergebnissen und der Simulation zeigt, dass die Berechnungen mit dem gemessenen WDK eine bessere Übereinstimmung mit den realen Werten aufweist, was die Zuverlässigkeit und Präzision der Spritzgusssimulation bestätigt. Die Ergebnisse dieser Arbeit tragen zum umfassenden Verständnis des Wärmeübergangs im Spritzgießprozess, zur Vorhersage der Temperaturverteilung, zur Auslegung des Kühlsystems, zur Reduzierung der Zykluszeit und zur Verbesserung der Genauigkeit der numerischen Simulation bei
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Patcharaphun, Somjate. "Characterization and Simulation of Material Distribution and Fiber Orientation in Sandwich Injection Molded Parts." Doctoral thesis, Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601845.
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In this work, the material distribution, structure of fiber orientation and fiber attrition in
sandwich and push-pull injection molded short fiber composites are investigated, regarding the
effect of fiber content and processing parameters, given its direct relevance to mechanical
properties. The prediction of the tensile strength of conventional, sandwich and push-pull
injection molded short fiber composites are derived by an analytical method of modified rule of
mixtures as a function of the area fraction between skin and core layers. The effects of fiber
length and fiber orientation on the tensile strength are studied in detail. Modeling of the
specialized injection molding processes have been developed and performed with the simulation
program in order to predict the material distribution and the fiber orientation state. The secondorder
orientation tensor (a11) approach is used to describe and calculate the local fiber
orientation state. The accuracy of the model prediction is verified by comparing with
corresponding experimental measurements to gain a further basic understanding of the melt flow
induced fiber orientation during sandwich and push-pull injection molding processes.
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Liu, Yao. "Heat transfer process between polymer and cavity wall during injection molding." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2014. https://monarch.qucosa.de/id/qucosa%3A20165.
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Injection molding is one of the most commonly applied processing methods for plastic components. Heat transfer coefficient (HTC), which describes the heat conducting ability of the interface between a polymer and cavity wall, significantly influences the temperature distribution of a polymer and mold during injection molding and thus affects the process and quality of plastic products. This thesis focuses on HTC under diverse processing situations.
On the basis of the heat conducting principle, a theoretical model for calculating HTC was presented. Injection mold specially used for measuring and calculating HTC was designed and fabricated. Experimental injection studies under different processing conditions, especially different surface roughness, were performed for acquiring necessary temperature data. The heat quantity across the interface and HTC between a polymer and cavity wall was calculated on the basis of experimental results. The influence of surface roughness on HTC during injection molding was investigated for the first time. The factors influencing the HTC
were analyzed on the basis of the factor weight during injection molding. Subsequently FEM (Finite element method) simulations were carried out with observed and preset value of HTC respectively and the relative crystallinity and part density were obtained. In the comparison between results from simulation and experiment, the result calculated with observed HTC shows better agreement with actually measured value, which can verify the reliability and precision of the injection molding simulation with observed HTC. The results of this thesis is beneficial for understanding the heat transfer process comprehensively, predicting
temperature distribution, arranging cooling system, reducing cycle time and improving precision of numerical simulation.Das Spritzgießen ist eines der am häufigsten angewandten Verarbeitungsverfahren zur Herstellung von Kunststoffkomponenten. Der Wärmedurchgangskoeffizient (WDK), welcher den Wärmeübergang zwischen Kunststoff und Werkzeugwand beschreibt, beeinflusst während des Spritzgießens maßgeblich die Temperaturverteilung im Bauteil und dem Werkzeug und folglich den Prozess und die Qualität der Kunststoffprodukte. Der Inhalt dieser Arbeit beschäftigt sich mit dem WDK unter verschiedenen Prozessbedingungen. Auf Grundlage des Wärmeleitungsprinzips wurde ein theoretisches Modell für die Berechnung des WDK vorgestellt. Es wurde dazu ein Spritzgießwerkzeug konstruiert und hergestellt, welches Messungen zur späteren Berechnung des WDK ermöglicht. Praktische Spritzgießversuche unter verschiedenen Prozessbedingungen, insbesondere unterschiedlicher Oberflächenrauheit, wurden für die Erfassung der erforderlichen Temperaturdaten durchgeführt. Auf Grundlage der experimentellen Ergebnisse wurde der Wärmeübergang zwischen dem Polymer und der Werkzeugwand berechnet. Der Einfluss der Oberflächenrauhigkeit auf den WDK wurde hierbei zum ersten Mal untersucht. Auf Grundlage des Bauteilgewichtes wurden anschließend die Faktoren, die den WDK beeinflussen, berechnet. Des Weiteren wurden FEM-Simulationen (Finite Element Methode) mit dem gemessenen und dem voreingestellten WDK durchgeführt und daraus der Kristallinitätsgrad und die Bauteildichte gewonnen. Der Vergleich zwischen den realen Ergebnissen und der Simulation zeigt, dass die Berechnungen mit dem gemessenen WDK eine bessere Übereinstimmung mit den realen Werten aufweist, was die Zuverlässigkeit und Präzision der Spritzgusssimulation bestätigt. Die Ergebnisse dieser Arbeit tragen zum umfassenden Verständnis des Wärmeübergangs im Spritzgießprozess, zur Vorhersage der Temperaturverteilung, zur Auslegung des Kühlsystems, zur Reduzierung der Zykluszeit und zur Verbesserung der Genauigkeit der numerischen Simulation bei.
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Villarreal-Marroquin, Maria G. "A Metamodel based Multiple Criteria Optimization via Simulation Method for Polymer Processing." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1356518813.
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Velez-Garcia, Gregorio Manuel. "Experimental Evaluation and Simulations of Fiber Orientation in Injection Molding of Polymers Containing Short Glass Fibers." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27335.
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Injection molded short fiber reinforced composites have generated commercial interest in the manufacturing of lightweight parts used in semi-structural applications. Predicting these materials’ fiber orientation with quantitative accuracy is crucial for technological advancement, but the task is difficult because of the effect of inter-particle interactions at high concentrations of fiber found in parts of commercial interest.
A complete sample preparation procedure was developed to obtain optical micrographs with optimal definition of elliptical and non-elliptical footprint borders. Two novel aspects in this procedure were the use of tridimensional markers to identify specific locations for analysis and the use of controlled-etching to produce small shadows where fibers recede into the matrix. These images were used to measure fiber orientation with a customized image analysis tool. This tool contains several modifications that we introduced in the method of ellipses which allow us to determine tridimensional fiber orientation and to obtain measurements in regions with fast changes in orientation. The tool uses the location of the shadow to eliminate the ambiguity problem in orientation and characterizes non-elliptical footprints to obtain the orientation in small sampling areas.
Cavitywise measurements in two thin center-gated disks showed the existence of an asymmetric profile of orientation at the gate and an orientation profile that washed out gradually at the entry region until disappearing at about 32 gap widths. This data was used to assess the prediction of cavitywise orientation using a delay model for fiber orientation with model parameters obtained from rheometrical experiments. Model predictions combining slip correction and experimentally determined orientation at the gate are in agreement with experimental data for the core layers near the end-of-fill region.
Radialwise measurements of orientation at the shell, transition and core layer, and microtextural description of the advancing front are included in this dissertation. The analysis and assessment of the radial evolution of fiber orientation and advancing front based on comparing the experimental data with simulation results are under ongoing investigation.Ph. D.
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Sanchez, Urbina Israel. "Optimizing flow of plastic PBT with 45% glass and mineral fiber reinforcement in an injection over mold process using Taguchi, CPk and mold flow simulation software approaches." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.
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Tran, Ngoc Tu [Verfasser], Michael [Akademischer Betreuer] Gehde, Michael [Gutachter] Gehde, and Thomas [Gutachter] Seul. "Creating material properties for thermoset injection molding simulation process / Ngoc Tu Tran ; Gutachter: Michael Gehde, Thomas Seul ; Betreuer: Michael Gehde." Chemnitz : Universitätsverlag Chemnitz, 2020. http://d-nb.info/1219664421/34.
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Simoes, Ricardo J. F. "Mechanical behavior and performance of injection molded semi-crystalline polymers." Thesis, University of North Texas, 2003. https://digital.library.unt.edu/ark:/67531/metadc5528/.
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I have used computer simulations to investigate the behavior of polymeric materials at the molecular level. The simulations were performed using the molecular dynamics method with Lennard-Jones potentials defining the interactions between particles in the system.
Significant effort was put into the creation of realistic materials on the computer. For this purpose, an algorithm was developed based on the step-wise polymerization process. The resulting computer-generated materials (CGMs) exhibit several features of real materials, such as molecular weight distribution and presence of chain entanglements.
The effect of the addition of a liquid crystalline (LC) phase to the flexible matrix was also studied. The concentration and distribution of the second phase (2P) were found to influence the mechanical and tribological properties of the CGMs. The size of the 2P agglomerates was found to have negligible influence on the properties within the studied range. Moreover, although the 2P reinforcement increases the modulus, it favors crack formation and propagation. Regions of high LC concentration exhibit high probability of becoming part of the crack propagation path. Simulations of the tensile deformation under a uniaxial force have shown that the molecular deformation mechanisms developing in the material depend on several variables, such as the magnitude of the force, the force increase rate, and the level of orientation of the chains. Three-dimensional (3D) graphical visualization tools were developed for representation and analysis of the simulation results. These also present interesting educational possibilities. Computer simulations provide us information which is inaccessible experimentally. From the concomitant use of simulations and experiments, a better understanding of the molecular phenomena that take place during deformation of polymers has been established.
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Nevřivý, Lukáš. "Technologie výroby plastového držáku střešního nosiče." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241702.
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This master’s thesis focuses on a design of injection mold which is used for manufacturing of a plastic holder of roof rack. The first part includes shape analysis of the holder and explains function of the product as well as specify essential requirements which must be met. The choice of the most suitable manufacturing technology is followed by theoretical part which deals with literature review of plastic materials, technology of injection molding and basics of injection mold designing. Practical part includes overall design of the mold for the holder of roof rack based on technological calculations. Practical part is followed by mold flow analysis simulation showing suitability of designed mold along with selection of suitable injection molding machine based on product construction design and technological process of manufacturing. The conclusion of master’s thesis includes an economical evaluation of proposed manufacturing technology.
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Kříbala, Milan. "Výroba součásti Dvojité koleno HTHT32/40 GI." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417092.
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The diploma thesis deals with the design of an injection mold for manufacturing double elbow, which finds its use in the siphon assembly. The part will be made of polypropylene with the trade name Tatren HT 25 11. The production batch size is set at 100,000 units in 3 months. Firstly, the analysis of the part is done including a detailed specification of its function and criteria that must be met by the component. Furthermore, a suitable technology for the production of the part is chosen. The theory of injection molding and mold design is made on the basis of the chosen injection technology. Subsequently, in the practical part is made a complete design of injection mold including technological calculations and simulations. An injection molding machine is chosen for the proposed injection mold. The conclusion of the thesis consists of technical - economic evaluation of the production of double elbow.
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Biglione, Jordan. "Simulation et optimisation du procédé d'injection soufflage cycle chaud." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0079/document.
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Le procédé d'injection soufflage est rendu accessible aux presses d'injection standard à travers le procédé d'injection soufflage cycle chaud, sans stockage puis réchauffe de la préforme. Le but étant de rendre accessible la production de petites séries de pièces creuses à des entreprises possédant un parc machine de presse à injecter. Les pièces sont réalisées en polypropylène et sont soufflées juste après avoir été injectées. Ce processus implique que la préforme se doit d'être suffisamment malléable pour être soufflée mais suffisamment visqueuse pour éviter de se rompre durant la phase de soufflage. Ces contraintes conduisent à une fenêtre de mise en oeuvre réduite, comprise entre la température de fusion du polymère et la température de cristallisation, soit le domaine ou le polypropylène est à l'état amorphe et suffisamment froid pour avoir une viscosité conséquente sans cristalliser. Ce procédé cycle chaud implique des gradients de température, de grands taux d'étirages et d'importantes cinétiques de refroidissement. Des mesures de rhéométrie à l'état fondu sont réalisées pour identifier le comportement de la matière dans la plage de température du procédé, de même que des tests de calorimétrie différentielle. L'observation du procédé et l'étude de la cristallisation du matériau permettent de supposer que ce dernier reste à l'état fondu durant la phase de soufflage. Un modèle rhéologique de Cross est utilisé, avec la dépendance thermique prise en compte par une loi d'Arrhénius. Le procédé est simulé à l'aide d'un logiciel de calcul par éléments finis dédié aux écoulements de fluides complexes (POLYFLOW) dans l'espace de travail ANSYS Workbench. La géométrie autorise une approche axisymétrique, facilitant ainsi la modélisation. Le calcul transitoire est lancé sous conditions anisothermes et l'auto-échauffement est considéré. Des études de sensibilité sont réalisées et révèlent l'influence de paramètres procédé tels que le comportement du matériau, la pression de soufflage et le champ de température initial. Des mesures d'épaisseurs sont réalisées en utilisant une méthode de traitement d'image permettant l'analyse des images numérisées de pièces découpées et des images issues de tomographie X des pièces. Les résultats simulés sont comparés aux mesures expérimentales. Le modèle présente les mêmes tendances que les mesures. L'existence de déformations élongationnelles, mais aussi par cisaillement lors du soufflage après contact avec le moule, est discutée. Une boucle d'optimisation est mise en place afin de déterminer numériquement la géométrie optimale de préforme. Des points de contrôle sont placés le long de la préforme et l'algorithme d'optimisation modifie les épaisseurs à ces pointsSingle stage injection blow molding process, without preform storage and reheat, could be run on a standard injection molding machine, with the aim of producing short series of specific hollow parts. The polypropylene bottles are blown right after being injected. The preform has to remain sufficiently malleable to be blown while being viscous enough to avoid being pierced during the blow molding stage. These constraints lead to a small processing window, and so the process takes place between the melting temperature and the crystallization temperature, where the polypropylene is in his molten state but cool enough to enhance its viscosity without crystallizing. This single stage process introduces temperature gradients, molecular orientation, high stretch rate and high cooling rate. Melt rheometry tests were performed to characterize the polymer behavior in the temperature range of the process, as well as Differential Scanning Calorimetry. A viscous Cross model is used with the thermal dependence assumed by an Arrhenius law. The process is simulated through a finite element code (POLYFLOW) in the Ansys Workbench framework. The geometry allows an axisymmetric approach. The transient simulation is run under anisothermal conditions and viscous heating is taken into account. Thickness measurements using image analysis are done and the simulation results are compared to the experimental ones. The experimental measurements are done by analizing tomography datas. The simulation shows good agreements with the experimental results. The existence of elongational strain as well as shear strain during the blowing after contact with the mold is discussed. An optimization loop is run to determine an optimal initial thickness repartition by the use of a Predictor/Corrector method to minimize a given objective function. Design points are defined along the preform and the optimization modifies the thickness at these locations. This method is compared to the Downhill Simplex Method and shows better efficiency
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Müller, Sascha, Sebastian Iwan, Marcel Meyer, and Lothar Kroll. "Integrative Prozess- und Bauteilsimulation für kurzfaserverstärkte Spritzgießbauteile." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-226118.
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Thermoplastische Kunststoffe werden zur Steigerung der mechanischen Eigenschaften häufig mit Kurzfasern verstärkt, wodurch sich jedoch eine anisotrope Eigenschaftscharakteristik einstellt. Dies führt oftmals zu ungewohntem Werkstoff- und Bauteilverhalten. Die Fertigungsparameter und -randbedingungen im Spritzgießprozess besitzen einen großen Einfluss auf lokale Faserorientierungen, wovon auch die globalen Bauteileigenschaften abhängen. Für eine werkstoffgerechte Auslegung von derartigen Bauteilen sind tiefgreifende Verständnisse über die mechanischen, thermischen und rheologischen Eigenschaften sowie die Kopplung von Spritzgieß- und Bauteilsimulation unerlässlich. Diese sogenannte integrative Simulation wird am Beispiel eines Strukturbauteiles aufgezeigt.
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Lin, Tsui-Hsun. "Birefringence, Anisotropic Shrinkage and Luminance in Injection Molded Light-Guide Plate: Modeling and Experiment." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1232005891.
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Dissertation (Ph. D.)--University of Akron, Dept. of Polymer Engineering, 2009."May, 2009." Title from electronic dissertation title page (viewed 11/27/2009) Advisor, Avraam I. Isayev; Committee members, James L. White, Thein Kyu, Kevin Kreider, Shi-Qing Wang; Department Chair, Sadhan C. Jana; Dean of the College, Stephen Cheng; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
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Nugay, Isik Isil. "POLYURETHANES in RIGID and FLEXIBLE ELECTRONICSNOVEL HYBRID PROCESSING TECHNIQUES and REAL-TIME MONITORING OF MATERIAL PROPERTIES." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1406633847.
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Maillot, Isabelle. "Simulation du remplissage/compactage pour la mise en forme des thermoplastiques par injection : applications industrielles." Université Joseph Fourier (Grenoble ; 1971-2015), 1993. http://www.theses.fr/1993GRE10029.
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Ce travail porte sur la modelisation des phases de remplissage et de compactage dans le procede de mise en forme des thermoplastiques par injection. Le but de notre etude est d'etablir un modele unique pour calculer l'ecoulement du polymere fondu dans la cavite refroidie de l'empreinte en tenant compte de la compressibilite des le debut du remplissage, de sorte que le compactage dans les zones remplies est simule sans rupture de modele. Le probleme instationnaire est non lineaire par le frot couplage des equations entre elles et par la variabilite des proprietes physiques (viscosite non newtonienne dependant fortement de la temperature et du taux de cisaillement, compressibilite, figeage, cristallisation partielle). Basees sur l'hypothese de hele shaw qui conduit a une formulation pression pour le calcul de la vitesse tangente, les equations sont resolues par des methodes de volumes finis construits sur la surface moyenne de la coque tridimensionnelle discretisee par triangulation elements finis pl. On montre que l'equation locale en pression permet d'evaluer les effets de convection transverse classiquement negliges dans les etudes existantes. L'avancee du front de matiere est calculee par un algorithme particulierement robuste issu d'une approche diphasique du systeme polymere/air. Des tests de convergence et de comparaisons avec des solutions analytiques connues valident les schemas numeriques utilises. Nous decrivons enfin la confrontation avec des mesures experimentales sur des problemes industriels complexes
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Khamzin, Yersin. "Technologie vstřikování zkušebních těles z termoplastů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-444217.
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The diploma thesis focuses on the optimization of technological parameters of plastic injection molding and the study of the influence of technological parameters on the quality of molded test specimens’ type 1A. The quality of molded parts for 3 types of polypropylene (PP) with different melt flow rate (Mosten GB 002, Mosten GB 218, Mosten MA 230) and 1 type of polystyrene (PS) (Krasten PS GP 154) was evaluated in terms of dimensional stability and weight. The contribution of software for modeling the plastic injection molding process was evaluated in this work. SOLIDWORKS Plastics software was used to optimize technological parameters. The construction of the bodies, mold and cooling system was constructed, and test bodies were produced on the basis of parameters obtained from the simulation of the injection molding process. Their quality parameters were compared with a 3D model and for each of the studied materials the optimal technological parameters were selected in terms of quality and the degree of influence of individual injection parameters on the quality of moldings was evaluated. The accordance of the results of the theoretical simulation with the real experiment was proved and a computational module independent of the optimized quality parameters, generally suitable for optimizing the quality parameters of the injected parts, was developed.
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Bhagavatula, Narayan L. "Modeling and experimental verification of pressure prediction in the in-mold coating process for thermoplastic substrates." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1145371989.
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Franc, Vladimír. "Návrh robotické buňky pro obsluhu vstřikolisů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400976.
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The aim of this thesis is to design a robotic cell for automated injection molding operation. At the beginning of this paper, the input parameters and the assignment are analyzed. This is then followed up by the layout of the workplace, design of its equipment, selection of robots and the design of their end effectors and peripherals with regard to the specified boundary conditions and operator’s safety. The output of this work is a 3D cell model and its simulation model in PLM software Siemens Process Simulate, which verifies the production cycle time.
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Imaddahen, Amine. "Étude expérimentale multi-échelle et modélisation hybride prédictive du comportement, de l'endommagement et de la durée de vie en fatigue d’un matériau composite polypropylène / fibres de verre." Thesis, Paris, HESAM, 2020. http://www.theses.fr/2020HESAE063.
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L’objectif final de ce travail est de proposer un outil numérique capable de prédire l'endommagement et la durée de vie en fatigue des matériaux et structures en composite à matrice thermoplastique. Pour ce faire, une étude expérimentale multi-échelle du matériaux PPGF40 (polypropylène chargé en fibre de verre à 40% en masse) est réalisée. Une analyse qualitative, mais aussi quantitative des différents mécanismes d’endommagement se produisant lors d’une sollicitation mécanique a été réalisée à travers des essais de flexion trois points in situ MEB, des essais de fatigue interrompus et des observations des faciès de rupture en monotone et en fatigue. A la lumière de ces essais nous avons conclu que la décohésion de l’interface fibre-matrice et la propagation des fissures à travers les interfaces apparait être le phénomène prépondérant menant à la ruine du matériau et cela indépendamment de l’orientation des fibres et du mode de sollicitation monotone ou fatigue. La démarche hybride proposée est basée sur un modèle micromécanique / phénoménologique permettant de prendre en compte l’endommagement à l’interface fibre-matrice et la plasticité de la matrice. Pour ce faire, un critère local statistique d’endommagement à l’interface fibre-matrice est introduit dans un modèle de Mori et Tanaka et la linéarisation du comportement plastique de la matrice est réalisée pas à pas, en utilisant une approche en champs moyens avec une formulation sécante. Le modèle micromécanique utilisé permet alors de prédire le comportement du matériau sous chargement monotone et notamment la première perte de rigidité en fatigue. L’analyse des résultats montre que cette dernière est directement liée à la durée de vie en fatigue du matériau. Ainsi, une méthodologie prédictive de la durée de vie est proposée et validée pour différentes configurations microstructurales. Un critère de rupture en fatigue est proposé en fonction du nombre de cyclesThe main objective of this work, is to provide a numerical tool, capable of predicting the damage and fatigue life of thermoplastic matrix composites materials and structures. To do this, a multi-scale experimental study of the PPGF40 material (polypropylene loaded with 40% by mass of glass fiber) is carried out. A qualitative, but also a quantitative analysis of the various damage mechanisms occurring during mechanical loading was carried out through in-situ three-points SEM bending tests, interrupted fatigue tests and observations of fracture faces in monotonic and cyclic loading. In the light of these tests, we concluded that the decohesion of the fiber-matrix interface, and the propagation of cracks through the interfaces, appears to be, the predominant damage phenomenon leading to the fracture of the material and that, regardless of the orientation of the fibers and the loading mode. The proposed hybrid approach is based on a micromechanical / phenomenological model taking into account the damage at the fiber / matrix interface and the plasticity of the matrix. To do this, a local statistical criterion of damage at the fiber-matrix interface is introduced into a Mori and Tanaka model, and the linearization of the plastic behavior of the matrix is done step by step, using the mean field approach with a secant formulation. The micromechanical model used then, makes it possible to predict the behavior of the material under monotonic loading, and in particular the first stiffness loss during the fatigue. Analysis of the experimental results shows that the latter is directly related to the fatigue life of the material. Thus, a predictive methodology of the fatigue life is proposed and validated for various microstructural configurations. A fatigue failure criterion is proposed according to the number of cycles
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Johansson, Hanna, and Maria Sundin. "Produktutformning och materialval för formsprutning : beträffande polymera material." Thesis, Linköpings universitet, Maskinkonstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-138501.
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Formsprutning är en tillverkningsmetod somställer krav på produkters utformning. För att göra en lämplig ingötsplacering räcker inte alltid riktlinjer utan en produktspecifik analys kan vara nödvändig. Materialval kräver en tydlig kravspecifikation och kan med fördel göras i samråd med en materialexpert. Riktlinjer för Design for manufacturing and assembly inkluderar bland annat rekommendationer för formgivning. Detta kandidatarbete strävar efter att hjälpa produktutvecklare att tidigt i produktutvecklingsprocessen ta hänsyn till tillverkningsaspekter. Baserat på litteraturstudier, intervjuer och fallstudier har riktlinjer tagits fram för materialval, design for manufacturing and assembly och formgivning för formsprutning. Arbetet är avgränsat till att endast titta på formsprutningsbara termoplaster. Arbetet, som genomförts vid Linköpings universitet, är en del av projektet Säkra monteringsverktyg som resulterade i ett portabelt dödmansgrepp. Defallstudier som genomfördes inom projektetbehandlar värdering av koncept utifrån produktionsperspektiv, materialval och formsprutningsanalyser i programmet Moldflow. Arbetet resulterade i riktlinjer för applicering av metoden design for manufacturing and assembly, formsprutningsanpassning samt materialval. Fallstudien i Säkra monteringsverktyg utmynnade ien värdering av koncept utifrån produktionsaspekter, ett materialval baserat på projektets kravspecifikation och rekommendationer för produktens utformning med syfte att optimera dess tillverkning. En slutsats av arbetet är att produktionsanpassning av produktens utformning bör ske tidigt i utvecklingsprocessen. En annan slutsats är att besök i industrin, hos exempelvis ett formsprutningsföretag, leder till bättre förståelse av vilka krav som behöver uppfyllas för att en produkt ska vara möjlig att producera. Om simuleringsprogram för formsprutning finns bör det användas i kombination med riktlinjer för produktutformning. Ytterligare en slutsats som gjorts är att materialval underlättas genom tidig kontakt med materialleverantörer. Materialvalet baseras på kravspecifikationen och därför bör kraven tydliggöras och dess rimlighet kontrolleras innan materialvalet sker.Injection molding is a manufacturing method that requires specific features to attain manufacturability. Gating suitability requires analysis and mere guidelines do not always provide the correct gate placement. Material selection requires a pronounced specification and is preferably supervised by an expert. Guidelines concerning design for manufacturing and assembly include, among other things, recommendations directly affecting the shape of the product. The aim for this bachelor thesis is to aid product developers and designers in taking manufacturing aspects into account early in the product development process. This is achieved by providing them with guidelines regarding material selection, injection molding, as well as design for manufacturing and assembly. The thesis is limited to thermoplastic materials suitable for injection molding and its results are based off thorough literature research, interviews and case studies. This bachelor thesis project, which is conducted at Linköping University,is a part of a project calledSafe manual assembly tools, and the resulting portable enabling device developed in Safe manual assembly toolsis used as case studies in this thesis. The case studies include: evaluation of concepts concerning manufacturability; material selection; and injection molding analysis through the software Moldflow. The thesis results in guidelines concerning design for manufacturing and assembly, injection molding and material selection. The case study is requited with concept selection suggestions, a selection of material that meets the specification of requirements stated in Safe manual assembly tools and design recommendations that aim to improve the manufacturability of the concept. This bachelor thesis concludes that design alterations striving to meet requirements for manufacturability should be made early in the devolpment process. Visiting the polymer-based product manufacturing industry offers better insight into which requirements that need to be fulfilled to make a product producible. Injection molding simulation software, if such is available, should be used in combination with design guidelines.The thesis also concludes that material selection is simplified through early contact with suppliers of material. Material selection is based off the specification of requirements and therefore requirements specified in the specification should be clarified and have their plausibility confirmed before the selection takes place.
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Maitre, Emmanuel. "Sur une classe d'équations à double non linéarité : application à la simulation numérique d'un écoulement visqueux compressible." Phd thesis, Université Joseph Fourier (Grenoble), 1997. http://tel.archives-ouvertes.fr/tel-00004955.
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L'origine de ce travail est l'étude d'un problème industriel sur la mise en forme des thermoplastiques par injection. Nous nous sommes concentrés sur la partie remplissage du moule et sur la détermination de la position du front du polymère. Le travail présenté dans cette thèse comprend donc deux parties: => L'étude mathématique et numérique de l'équation en pression qui régit l'écoulement du polymère fondu. A partir de cet exemple nous avons mis en évidence et étudié une famille nouvelle d'équations à double non linéarité. => La détermination de l'interface polymère-air par des méthodes de suivi de lignes de niveau, l'interface étant décrite comme la ligne de niveau zéro d'une inconnue auxiliaire, que nous devons calculer. Nous avons obtenu l'existence d'une solution à l'équation de transport linéaire avec conditions aux limites à laquelle satisfait cette nouvelle inconnue. Puis nous avons mis au point une méthode numérique pour le calcul de l'interface polymère/air, en résolvant par éléments finis / volumes finis l'équation en pression et l'équation de transport du front. Notre méthode présente l'avantage d'une mise en oeuvre relativement aisée, robuste car elle permet de gérer les changements de topologie du front.
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玲, 井上, and Akira Inoue. "射出成形におけるスクリュ形状の最適化に関する研究." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13044921/?lang=0, 2017. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB13044921/?lang=0.
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多様化する樹脂材料の射出成形において，目的に応じた溶融状態を得るための高度な可塑化技術が求められている．本研究では，流動シミュレーションを用いて可塑化現象を定量化し，所望の溶融状態に対する影響因子を明らかにすることでスクリュ形状を最適化し，実験検証により検討の妥当性を確認した．また，スクリュ形状を3Dプリンタによりプロトタイピングし，疑似流体を用いた可視化モデル実験を提案し，新規スクリュの開発手法としての有効性を示した．In injection molding of diversified resins, it has been required advancement of plasticizing technology in order to realize a melting condition according to purpose. This study investigated quantifying phenomena by flow simulation, and optimizing the screw design by clarifying the influence factors for the desired melting condition. The effects of optimized screw were confirmed the validity of results by experimental validations. Also, models experiments of visualizing test that utilized simulated fluid and prototyped screw by 3D printer were proposed, there were indicated efficacy for the development approach of new screw design.
博士(工学)
Doctor of Philosophy in Engineering
同志社大学
Doshisha University
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Ortman, Kevin Charles. "Assessing an Orientation Model and Stress Tensor for Semi-Flexible Glass Fibers in Polypropylene Using a Sliding Plate Rheometer: for the Use of Simulating Processes." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/77164.
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Great interest exists in adding long fibers into polymeric fluids due to the increase in properties associated with the composite, as compared to the neat resin. These properties, however, are dependent on the fiber orientations generated during processing, such as injection molding. In an effort to optimize industrial processing, optimize mold design, and maximize desired properties of the final part, it is highly desirable to predict long fiber orientation as a function of processing conditions.
The purpose of this research is to use rheology as a fundamental means of understanding the transient orientation behavior of concentrated long glass (> 1mm) fiber suspensions. Specifically, this research explores the method of using rheology as a means of obtaining stress tensor and orientation model parameters needed to accurately predict the transient fiber orientation of long glass fiber reinforced polypropylene, in a well-defined simple shear flow, with the hopes of extending the knowledge gained from these fundamental experiments for the use of simulating processing flows, such as injection molding. Two fiber orientation models were investigated to predict the transient orientation of the long glass fiber systems explored. One model, the Folgar-Tucker model, has been particularly useful for predicting fiber orientation in short glass fiber systems and was used in this paper to assess its performance with long glass fibers. A second orientation model, one that accounts for the semi-flexibility of fibers, was extended to describe non-dilute suspension and coupled with an augmented stress tensor that accounts for fiber bending. Stress tensor and orientation model parameters were determined (in all cases) by best fitting these coupled equations to measured stress data obtained using a sliding plate rheometer. Results showed the semi-flexible orientation model and stress tensor combination, overall, provided improved rheological results as compared to the Folgar-Tucker model when coupled with the stress tensor of Lipscomb (1988). Furthermore, it was found that both stress tensors required empirical modification to accurately fit the measured data. Both orientation models provided encouraging results when predicting the transient fiber orientation in a sliding plate rheometer, for all initial fiber orientations explored. Additionally, both orientation models provided encouraging results when the model parameters, determined from the rheological study, were used for the purpose of predicting fiber orientation in an injection molded center-gated disk.Ph. D.
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Mazahir, Syed Makhmoor. "Improvement in Orientation Predictions of High-Aspect Ratio Particles in Injection Mold Filling Simulations." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/50654.
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Glass fiber based polymer composites based injection molded parts provide a light-weight high-strength alternative for use in automobile applications. These composites have enhanced mechanical properties compared to those of pure polymers, if the fibers are oriented in the right direction. One of the major challenges in processing of these composites is to control the fiber orientation in the final product. The evolution of short glass fiber orientation in a center-gated disk was experimentally determined along the radial direction at three different heights representative of the shell, transition and core layers, respectively. Orientation data along the shell and transition layers in the lubrication region show shear flow effects, which tends to align the fibers along the flow direction. In the core layer, where the extension in the "-direction dominates, fibers tend to get aligned along the "-direction. In the frontal flow region orientation in the flow direction drops in all three layers due to fountain flow effects.
Fiber orientation predictions in coupled and decoupled transient simulations using the Folgar-Tucker model, and the two slow versions of the Folgar-Tucker model, namely the slip Folgar-Tucker model and the reduced strain closure (RSC) model were compared with the experimental data. Measured inlet orientation was used in all simulations and model parameters were determined by fitting model predictions to rheological data under startup of shear. Pseudo-concentration method was implemented for the modeling of the advancing front and fountain flow effects in the region near the front. Discontinuous Galerkin finite element method and a third order Runge-Kutta total variance diminishing time integration scheme were implemented for the solution of the orientation and transport equations. In the lubrication region of the shell layer, all three orientation models provided a good match with the experimental data. In the frontal region, fountain flow simulations showed characteristic features seen in r- and z-profiles of orientation, although the experimental data showed these features at a relatively larger distance behind the front while the simulations predicted these effects only upto a small distance behind the front. On the other hand, orientation predictions with the Hele-Shaw flow approximation showed significant over-predictions in the frontal region. With model parameters determined from fitting to rheological data, coupling did not show any significant improvements. However, with the use of a smaller value of the fiber interaction parameter, coupling showed significant improvement in orientation predictions in all three layers in the frontal region.
The simulation scheme was extended to long fiber systems by comparing available long fiber orientation data in a center-gated disk with model predictions using the Bead-Rod model which considers fiber bending, a property exhibited by long semi-flexible fibers. The Bead-Rod model showed improvements over rigid fiber models in the lubrication region of the shell layer. However, close to the front, both models showed similar predictions. In fountain flow simulations, the flow features seen in the r- and z-profiles were much better predicted with both the models while Hele-Shaw flow approximation showed over-prediction of orientation in the flow direction, especially in the shell layer.
Ph. D.
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Naumann, Roman. "Wireless Networking in Future Factories: Protocol Design and Evaluation Strategies." Doctoral thesis, Humboldt-Universität zu Berlin, 2020. http://dx.doi.org/10.18452/21013.
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Industrie-4.0 bringt eine wachsende Nachfrage an Netzwerkprotokollen mit sich, die es erlauben, Informationen vom Produktionsprozess einzelner Maschinen zu erfassen und verfügbar zu machen. Drahtlose Übertragung erfüllt hierbei die für industrielle Anwendungen benötigte Flexibilität, kann in herausfordernden Industrieumgebungen aber nicht immer zeitnahe und zuverlässige Übertragung gewährleisten. Die Beiträge dieser Arbeit behandeln schwerpunktmäßig Protokollentwurf und Protokollevaluation für industrielle Anwendungsfälle. Zunächst identifizieren wir Anforderungen für den industriellen Anwendungsfall und leiten daraus konkrete Entwufskriterien ab, die Protokolle erfüllen sollten. Anschließend schlagen wir Protokollmechanismen vor, die jene Entwurfskriterien für unterschiedliche Arten von Protokollen umsetzen, und die in verschiedenem Maße kompatibel zu existierenden Netzwerken und existierender Hardware sind: Wir zeigen, wie anwendungsfallspezifische Priorisierung von Netzwerkdaten dabei hilft, zuverlässige Übertragung auch unter starken Störeinflüssen zu gewährleisten, indem zunächst eine akkurate Vorschau von Prozessinformationen übertragen wird. Für deren Fehler leiten wir präziser Schranken her. Ferner zeigen wir, dass die Fairness zwischen einzelnen Maschinen durch Veränderung von Warteschlangen verbessert werden kann, wobei hier ein Teil der Algorithmen von Knoten innerhalb des Netzwerks durchgeführt wird. Ferner zeigen wir, wie Network-Coding zu unserem Anwendungsfall beitragen kann, indem wir spezialisierte Kodierungs- und Dekodierungsverfahren einführen. Zuletzt stellen wir eine neuartige Softwarearchitektur und Evaluationstechnik vor, die es erlaubt, potentiell proprietäre Protokollimplementierungen innerhalb moderner diskreter Ereignissimulatoren zu verwenden. Wir zeigen, dass unser vorgeschlagener Ansatz ausreichend performant für praktische Anwendungen ist und, darüber hinaus, die Validität von Evaluationsergebnissen gegenüber existierenden Ansätzen verbessert.As smart factory trends gain momentum, there is a growing need for robust information transmission protocols that make available sensor information gathered by individual machines. Wireless transmission provides the required flexibility for industry adoption but poses challenges for timely and reliable information delivery in challenging industrial environments. This work focuses on to protocol design and evaluation aspects for industrial applications. We first introduce the industrial use case, identify requirements and derive concrete design principles that protocols should implement. We then propose mechanisms that implement these principles for different types of protocols, which retain compatibility with existing networks and hardware to varying degrees: we show that use-case tailored prioritization at the source is a powerful tool to implement robustness against challenged connectivity by conveying an accurate preview of information from the production process. We also derive precise bounds for the quality of that preview. Moving parts of the computational work into the network, we show that reordering queues in accordance with our prioritization scheme improves fairness among machines. We also demonstrate that network coding can benefit our use case by introducing specialized encoding and decoding mechanisms. Last, we propose a novel architecture and evaluation techniques that allows incorporating possibly proprietary networking protocol implementations with modern discrete event network simulators, rendering, among others, the adaption of protocols to specific industrial use cases more cost efficient. We demonstrate that our approach provides sufficient performance and improves the validity of evaluation results over the state of the art.
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Ou, Huibin. "Modélisation multi-physiques et simulations numériques du moulage par injection mono et bi matières thermoplastique / silicone liquide." Thesis, Besançon, 2015. http://www.theses.fr/2015BESA2001/document.
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La famille des élastomères silicones LSR (Liquid Silicone Rubber) de haute technicité est identifiée comme celle possédant les plus forts arguments de développement au cours des prochaines décennies en raison de leurs propriétés spécifiques et de leurs facilités de mise en forme en grande série. Notamment, le moulage par injection du LSR sur d’autres matières telles que les thermoplastiques ou les métaux est aujourd’hui possible, ce qui ouvre la possibilité d’obtenir des composants multi-matières, multi-couleurs et de nouvelles fonctionnalités. Cette thèse se concentre sur la transformation des élastomères silicones LSR dans le but de mieux appréhender les phénomènes impliqués, afin d’améliorer les procédés d’élaboration et d’optimiser les conditions de transformation des composants élastométriques mono ou bi-matières à géométrie et propriété fonctionnelle bien définie. Les comportements rhéologique, cinétique et thermique des élastomères silicones ont été étudiés et caractérisés sous des conditions réelles de mise en œuvre par différentes méthodes associées. Un modèle thermo-rhéo-cinétique a été développé et ensuite implémenté dans un code de calcul de remplissage Cadmould® pour simuler le moulage par injection des élastomères silicones LSR ou encore le surmoulage de thermoplastiques. Pour la validation des modèles choisis et des paramètres identifiés, les essais d’injection sur l’outillage industrielle instrumenté ont été réalisés et confrontés à des résultats numériques obtenus. Enfin, la caractérisation de l’adhésion et l’adhérence interfaciale entre les thermoplastiques et les élastomères silicones a été réalisé sous différentes sollicitations complexes. De plus, l’évolution d’adhérence interfaciale des assemblages collés au cours de la vulcanisation des élastomères silicones a été caractérisée par l’essai de traction en utilisant un rhéomètre rotatif sous différentes modes de chauffageThe family of high technology silicone elastomers LSR (Liquid Silicone Rubber) is identified as having the strongest arguments for development in the coming decades due to their unique properties and easy forming in large series. In particular, the injection molding of LSR on other materials such as thermoplastics or metals is possible today, which opens the possibility of obtaining multi-material, multi-color and new features components. The work presented in this thesis focuses on the transformation of silicone elastomers in order to better understand the phenomena involved, as to improve production processes and optimize processing conditions for mono or bi-material components in geometry and property functional well defined. The rheological, curing kinetic and thermal behaviors of silicone elastomers have been studied and characterized under real conditions of production by different methods combined. A thermo-rheo-kinetic model was then developed and implemented in commercial computer software Cadmould® to simulate the injection molding process of LSR or the overmolding process of LSR on to thermoplastics. For the validation of the models chosen and the parameters identified, the injection molding tests on industrial instrumented tools were performed and compared to numerical results. Finally, the characterization of interfacial adhesion between the thermoplastic and silicone elastomers was carried out under various adhesion tests. Moreover, the evolution of interfacial adhesion in thermoplastic/silicone components during the vulcanization of silicone elastomers has been characterized by the tensile test using a rotating rheometer in different heating cycles
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Mnekbi, Djebali Cheima. "Rhéologie des polymères fondus à hauts taux de cisaillement : application à la microinjection." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00820185.
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La rhéologie à hauts taux de cisaillement pour deux polymères, le PEHD semi-cristallin et le PMMA amorphe a été étudiée. Des outils de rhéométrie classique, un rhéomètre plan-plan en mode dynamique, et un rhéomètre capillaire, ont été utilisés dans des conditions extrêmes (avec des filières pour la rhéométrie capillaire de diamètres allant jusqu'à 0,3 mm) mais les dépouillements de ces résultats ont été fait suivant les hypothèses conventionnelles en négligeant les instabilités et les phénomènes physiques qui interviennent lors de ces écoulements.Nous avons par la suite développé un modèle mathématique de l'écoulement dans un capillaire pour rendre compte de l'importance des différents phénomènes physiques qui peuvent avoir lieu dans des écoulements extrêmes, à savoir l'échauffement et la piezodépendance de la viscosité, la compressibilité et le glissement à la paroi. Les résultats du modèle développé ont été comparés avec les résultats expérimentaux.Nous avons aidé au développement d'une presse de microinjection originale et nous l'avons testée avec un moule de plaque instrumenté d'épaisseur allant jusqu'à 0,2 mm. Nous avons montré qu'il était possible de réaliser des pièces de qualité ce qui est avéré par des mesures de pression, vitesse et de température bien reproductibles. Nous avons exploité les données rhéologiques expérimentales dans la modélisation de la phase de remplissage avec le logiciel de calcul Rem3D. Des corrélations entre les mesures expérimentales et les calculs ont été réalisées en comparant l'évolution des pressions dans le système d'alimentation et dans l'empreinte.
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Chen, Cheng-Kang, and 陳正剛. "Simulation of the injection molding of microstructures." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/04366983840429761012.
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碩士國立交通大學
機械工程系所
96
In recent years, how to form smaller and higher-aspect-ratio of micro structures has been the focus of plastic-forming. It is hard to directly observe the flow condition and measure the internal state of molten plastic in the process of micro-injection molding, because of high temperature and high pressure. The purpose of this study is to obtain the information which can not be directly obtained in the process of micro- injection molding by numerical simulation analysis. The information of molten plastic in the process of micro-injection molding can be obtained in numerical simulation result. The simulation results show that it, consist of the surface layer, the middle layer, and the core layer formed from the lateral surface to the interior, can be found in the base-plate of the injection molded. In the microstructure with 10 μm thickness, the flow condition of molten plastic is fountain flow. The pressure distributions in thickness direction in a micro-cavity are not symmetrical to the center line of the thickness. The temperature of molten plastic decreases fast, and becomes lower than melting temperature or Tg in a short time after the melt filling into the micro-cavity. Although the filling speed of the molten plastic in the micro-cavity is low to be about 1% of that in the major cavity, the maximum shear rate of the melt in the micro-cavity is high to be four times of that in the major cavity.
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Wang, Wei-Tsan, and 王唯讚. "Molecular Dynamics Simulation of Molding Filling in Nano-Injection Molding Process." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/32393555864076768289.
Full textAbstract:
碩士國立清華大學
化學工程學系
94
In this research, molecular dynamics simulation is adopted to simulate the molding filling in nano-injection molding process. Our work divided into two parts is as follows. (I) Glass transition temperature : Molecular dynamics is adopted to simulate the glass transition temperature of polypropylene at different chain length, and the chain length has 200, 400 and 800 , respectively. The simulated purpose is to explore the relation between the chain length(molecular weight) of polymer and the glass transition temperature of polymer. (II) We adopt molecular dynamics to simulate the nano-scale injection molding process, and investigate the defects during molding filling process. With decreasing the injection velocity, the adsorption phenomena at the entrance of mold will become more obvious. The orientation of polymer is obvious at the wall of runner and the wall which faces the entrance of mold. While the temperature of system at 350 K, polymer has less tendency to adsorb on the wall.
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Hsu, Kuo Fu, and 徐國福. "The Numerical Simulation of Multi-Component Injection Molding." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/51917033469414639998.
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Qiu, Zheng-Cheng, and 邱正成. "Optimization of Plastic Lenses in Injection Molding and Computer Simulation." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/19316786893324778806.
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Liou, Kuang Yuan, and 劉光原. "The Simulation of the Cooling Process in Plastic Injection Molding." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/63103831960635179236.
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林紹文. "Simulation of mold filling with solidification for injection molding process." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/33204007682310765498.
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李進順. "Research on Simulation of Injection Molding for Barrel-Shaped Plastic Part." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/48966360316726286505.
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碩士逢甲大學
機械與電腦輔助工程學系
103
The study used computer-aided mold flow analysis software Autodesk Simulation Moldflow Synergy to investigate the key factors of long cylindrical high-magnification zoom lens barrel plastic part in the process of forming, and the influences on the formability and roundness with different injection forms and gate location setting. Results showed that the cavity center easily gather heat in the process of forming the plastic long cylindrical zoom lens barrel, so the cooling channel in the central core is necessary. The camera barrel forming process with non-uniform thickness caused hesitation for the formability has very huge influence. The compound injection system which has three equal distributed pin-point gates in the barrel top and three equal distributed side gates just below the thin grooves improves the effectiveness of hesitation and the data of forming and the roundness. It has better performance in the experiments of serval kinds of injection system. Hence, hesitation and roundness could be controlled through the design of the gate location and number of gates.
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Chen, Yu-Peng, and 陳佑朋. "Optimization of process parameters for injection molding simulation of bolt catch." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/vh33tb.
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碩士國立中央大學
機械工程學系
106
Metal Injection Molding (MIM) has taken a place in the production of precision metal parts due to the advantages of high productivity and high complexity. Control of the injection molding stage, the quality, and the feedstock is the important issue. Especially for combination of feedstock which is composed of binder and metal powder also makes the rheology more difficult to know. The situation of powder binder separation often occurs during the filling process. In this study, molding simulation was used to optimize the parameters, and to improve the problem of green parts warpage and powder concentration uniformity for MIM. The analysis process is separated into two major stages. In the first stage, the initial simulation is performed to verify the short shot of experiments. Furthermore, the working window for injection molding is established. In the second stage, the experimental design of the Taguchi method is adopted to get the optimization for warpage and powder concentration uniformity. The results of first stage show that the experimental short shot similar to simulated one. In addition, the position of the welding line can also be well predicted. The optimization results of the Moldex3D Design of Expert (DOE) show that the maximum improvement on warpage achieves 11.6%. When these optimized parameters are used in experiments, the maximum improvement on warpage can achieve 57.78%, and the average improvement achieves 20%. Moreover, the optimized parameters can reduce the cycle time of 3s compared with the original design, which brings significant benefits to the dimensional precision and production efficiency. Before optimization of powder concentration uniformity, the original powder concentration percentage was between 56.8169% and 62.7930% and its average powder concentration was 60.0313%. After optimization, the powder concentration percentage is between 58.6520% and 60.2703% and its average powder concentration is 60.0145%. Therefore, the powder concentration becomes uniform. In other words, this parameter adjustment can reduce the local powder accumulation or the powder binder separation.
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Su, Shiuan-Cheng, and 蘇軒丞. "The Optimization of Injection Molding Parameters Based on Photoelastic Simulation Technology." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/85026396512458657274.
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碩士國立交通大學
機械工程學系
98
The plastic products are widely used in many items in all walks of life. They play an important role in those appearance and structural parts. With the improvement of the quality of plastic materials and the new method of the plastic material technique appear, the plastic products are used in high-precision mechanical devices and spare-parts more and more widely. However, there are many problems still affect the quality. The main purpose of this study wants to research the residual stress of the plastic products after the injection molding manufacturing process, find the effect of the manufacturing conditions and the relationship. Then create a process of optimization for both residual stress and warpage. Using the 3D moldflow analysis software - Moldex3D and Taguchi’s experimental method and controlling the manufacturing conditions to analyze the rectangular sheet and the part of robot foots. To Observes the residual stress, we use the simulation photoelastic method to analyze the distribution of the residual stress. Therefore, find and analyze the relationship of the residual stress and warpage. Expect to maintain the ideal shape and can also improve the residual stress and warpage after the injection molding manufacturing process of plastic products. According to this paper, in the injecting time, melting temperature, packing time, cooling time, packing pressure, and injecting pressure, the manufacturing conditions have the most effective to residual stress are injecting time and melting temperature. The manufacturing conditions have the most effective to warpage are cooling time and packing pressure. Using these relationships, we can generalize a batter combination of manufacturing conditions to optimize both residual stress and warpage.
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WANG, JI, and 王紀. "Simulation and processing-mechanical property relationships in injection molding of polypropylene." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/36409705932223338904.
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Lu, Ping-Hang, and 呂秉翰. "Molecular Dynamics Simulation of Injection Molding Filling System on Nano-Scale Flow." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/42142350101665855108.
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碩士國立清華大學
化學工程學系
95
In this research, molecular dynamics simulation is adopted to simulate the glass transition temperature of polyethlene and the molding filling in nano-injection molding process. Our work divided into two parts is as follows. I. Glass transition temperature：Molecular dynamics is adopted to simulate the glass transition temperature of polymer at different chain lengths, and the chain lengths are 100,200,400 and 800, respectively. The purpose of the simulation is to explore not only the relation between the chain length and the glass transition temperature of polymer, but also the relation between the pressure and the glass transition temperature of polymer at the same chain length. II. Unsteady nano injection molding：With increasing chain length, the density of local system gets more uniform.The probability of warpage becomes great with increasing the interaction between metal particle and polymer particle. Besides, the simulation results between Pt and Au are almost the same. However, if the injection velocity is too large, more plastics will be wasted and the filling quality is relatively bad. Finally, when the temperature is on the increase, the polymer gets easier to be processed and the density in the mold gets more uniform.
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Minh-SangTran and 陳民山. "Experiment and Simulation of Induction Heating System for Injection Molding Machine Barrel." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/23373849900049644444.
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碩士國立成功大學
機械工程學系碩博士班
100
Induction heating method has been widely used for a long time and its applications are quite popular such as brazing, surface hardening, forming, plastic reflow, soldering… Electromagnetic induction heating method has a lot of advantages such as precise temperature control, low energy consumption, high heating speed, environmental pollution limit and production cycle reduction. Based on effective heating applications of the above method, it is proposed to apply heat for injection molding machine barrel and hot runner instead of using the resistance heating method. Therefore, this method will be researched and discussed in this study. The focal point of this thesis is to design a solenoid coil in order to heat barrel and hot runner. In another case, the magnetic flux concentrator is attached on the coil to evaluate its effect. Besides, a simulation of induction heating system using ANSYS software is also performed. Finally, the experiment results will be compared to simulation results to evaluate the feasibility of simulation method. In experiment tests for barrel, the average heating rates were 0.56 0C/sec, 0.53 0C/sec, 0.51 0C/sec, 0.47 0C/sec and 0.49 0C/sec for induction heating type 1, 2, 3, 4 and resistance type, respectively. Similarly, the average temperature uniformities were 90.88%, 91.59%, 90.7%, 95.82% and 95.71%, respectively. In addition, the temperature uniformities difference between experiment results and simulation results also brought out many positive results. These differences were only 5.93%, 2.59%, 2.86% and 2.44% for types 1, 2, 3 and 4, respectively. From the experiment results for hot-runner, the results after adjusting brought out more improvement and uniformity compared to the results before adjusting. The temperature uniformities were 64.9%, 66.19%, 67% before adjusting and 91.4%, 91.1%, 90.62% after adjusting for power level 22.5A, 18.5A and 15.5A, respectively. Furthermore, average heating rate could reach 2.82 0C/sec. The results of temperature uniformity differences between experiments and simulations were from 2.44% to 6.31% for 3 power levels.
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Wang, Tzu-Yi, and 王子怡. "The experiment and simulation of plastic injection molding product with metal insert." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/33155262768953453070.
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碩士國立高雄應用科技大學
模具系碩士在職專班
101
In my in-depth study of metal embedded in plastic injection molding and structural design of relationship. This research results provide the latest embedded product design basis. First use ABAQS finite element analysis software to analyze the different structures of the flexural deformation capacity and further analysis using Moldflow software in the same injection molding process parameters to analyzed the difference in structures. This verifies the reliability and practical control deformation to obtain the most stable structure condition. The original experimental thesis the inserts is thickness 0.3 mm warping deformation of 0.84mm. After the insert structural optimize and change the thickness to 0.4mm and the inserts after warping deformation to 0.20mm. It’s based on the cost and weight of design consideration to optimized design of the original insert with thickness of 0.3mm, by using Taguchi analysis software to define the optimal combination of Moldflow injections molding process parameters. In order to achieve the minimum amount of warping and products assembly requirements flatness fell 0.2mm or less. As the research results show adjust the mold temperature and melting temperature can effectively reduce the amount of Warping deformation , which changed the mold temperature to most influential factor.