Thematische Bibliographien / FEA validation

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Auswahl der wissenschaftlichen Literatur zum Thema „FEA validation“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 10. Februar 2022

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Zeitschriftenartikel zum Thema "FEA validation"

Panagiotopoulou, O., S. D. Wilshin, E. J. Rayfield, S. J. Shefelbine und J. R. Hutchinson. „What makes an accurate and reliable subject-specific finite element model? A case study of an elephant femur“. Journal of The Royal Society Interface 9, Nr. 67 (13.07.2011): 351–61. http://dx.doi.org/10.1098/rsif.2011.0323.

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Finite element modelling is well entrenched in comparative vertebrate biomechanics as a tool to assess the mechanical design of skeletal structures and to better comprehend the complex interaction of their form–function relationships. But what makes a reliable subject-specific finite element model? To approach this question, we here present a set of convergence and sensitivity analyses and a validation study as an example, for finite element analysis (FEA) in general, of ways to ensure a reliable model. We detail how choices of element size, type and material properties in FEA influence the results of simulations. We also present an empirical model for estimating heterogeneous material properties throughout an elephant femur (but of broad applicability to FEA). We then use an ex vivo experimental validation test of a cadaveric femur to check our FEA results and find that the heterogeneous model matches the experimental results extremely well, and far better than the homogeneous model. We emphasize how considering heterogeneous material properties in FEA may be critical, so this should become standard practice in comparative FEA studies along with convergence analyses, consideration of element size, type and experimental validation. These steps may be required to obtain accurate models and derive reliable conclusions from them.

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Acar, Dogan, Mevlut Turkoz, Hasan Gedikli und Omer Necati Cora. „Finite Element Analysis and Experimental Validation of Warm Hydromechanical Deep Drawing Process“. Applied Mechanics and Materials 686 (Oktober 2014): 535–39. http://dx.doi.org/10.4028/www.scientific.net/amm.686.535.

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This study intended to establish finite element analysis (FEA) model of warm hydro mechanical deep drawing process (WHMD) of cylindrical cups by means of commercial FEA package Ls-Dyna The validity of established FEA model is verified by means of WHMD experiments through several studies. It was noted that the established model successfully simulated the real process leading to significant cost and time spent on trial-error stage in hydromechanical deep-drawing of lightweight alloys.

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Kořínek, Jan. „Validation of Sinus Filter Choke Temperature Model“. TRANSACTIONS ON ELECTRICAL ENGINEERING 5, Nr. 2 (30.03.2020): 53–58. http://dx.doi.org/10.14311/tee.2016.2.053.

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<span lang="EN-GB">This article discusses the relationship between the losses of a sinus filter choke. Its influence on the loaded sinus filter temperature field distribution within and on the surface, verification of these performance and temperature relationships. It includes three-dimensional transient finite element analysis (FEA) of the sinus filter choke temperature conditions based on a mathematical description of the conduction, free convection and losses and describing temperature field validation methodology. In addition, there is shown mutual evaluation of the validation measurement and FEA simulation. Finally, there are outlined further options for the future optimisation of the sinus filter choke thermal simulation.</span>

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P. Hassan, Mohamed, Abdullah Saad Mahmud, A. S. M. Rafie und Rizal Zahari. „Alternative Numerical Validation Methodology for Short-Term Development Projects“. Applied Mechanics and Materials 564 (Juni 2014): 638–43. http://dx.doi.org/10.4028/www.scientific.net/amm.564.638.

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Virtual prototyping has been increasingly taking over the process of sole physical tests. Companies are reporting up to 80% reduction in errors when using virtual tests through the design process. Conventional numerical validation methodology however, is not as beneficial for short-term projects because any new numerical scenario has to be validated before being used. Although during the conceptual stage, relative values can be sufficient. The alternative methodology proposed also uses realistic loads. It comprise applying these loads on a functioning structure to verify them. The modified version of the structure is then relatively validated by being tested under these verified loads. Thus, bypassing the physical tests requirement. Aerodynamic loads are acquired from simulating the Gulfstream IV-SP forward fuselage during climbing, cruising and landing. Mechanical loads are acquired from estimating structural weight and impact load during landing. In total, three finite element models were created. Autodesk softwares were used to perform CFD and FEA. Only greater loads were applied during FEA. Results simplified neglected cruising data for having lowest values. Comparing estimated weights of functional and modified structures showed a possible 15% weight savings. While the FEA results showed a promising 45% less inquired stress within the modified structure.

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De Strycker, Maarten, Pascal Lava, Wim Van Paepegem, Luc Schueremans und Dimitri Debruyne. „Validation of Welding Simulations Using Thermal Strains Measured with DIC“. Applied Mechanics and Materials 70 (August 2011): 129–34. http://dx.doi.org/10.4028/www.scientific.net/amm.70.129.

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Residual stresses can affect the performance of steel tubes in many ways and as a result their magnitude and distribution is of particular interest to many applications. Residual stresses in cold-rolled steel tubes mainly originate from the rolling of a flat plate into a circular cross section (involving plastic deformations) and the weld bead that closes the cross section (involving non-uniform heating and cooling). Focus in this contribution is on the longitudinal weld bead that closes the cross section. To reveal the residual stresses in the tubes under consideration, a finite element analysis (FEA) of the welding step in the production process is made. The FEA of the welding process is validated with the temperature evolution of the thermal simulation and the strain evolution for the mechanical part of the analysis. Several methods for measuring the strain evolution are available and in this contribution it is investigated if the Digital Image Correlation (DIC) technique can record the strain evolution during welding. It is shown that the strain evolution obtained with DIC is in agreement with that found by electrical resistance strain gauges. The results of these experimental measuring methods are compared with numerical results from a FEA of the welding process.

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Bright, Jen A. „A review of paleontological finite element models and their validity“. Journal of Paleontology 88, Nr. 4 (Juli 2014): 760–69. http://dx.doi.org/10.1666/13-090.

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Finite element analysis (FEA) is a powerful quantitative tool that models mechanical performance in virtual reconstructions of complex structures, such as animal skeletons. The unique potential of FEA to elucidate the function, performance, and ecological roles of extinct taxa is an alluring prospect to paleontologists, and the technique has gained significant attention over recent years. However, as with all modeling approaches, FE models are highly sensitive to the information that is used to construct them. Given the imperfect quality of the fossil record, paleontologists are unlikely to ever know precisely which numbers to feed into their models, and it is therefore imperative that we understand how variation in FEA inputs directly affects FEA results. This is achieved through sensitivity and validation studies, which assess how inputs influence outputs, and compare these outputs to experimental data obtained from extant species. Although these studies are restricted largely to primates at present, they highlight both the power and the limitations of FEA. Reassuringly, FE models seem capable of reliably reproducing patterns of stresses and strains even with limited input data, but the magnitudes of these outputs are often in error. Paleontologists are therefore cautioned not to over-interpret their results. Crucially, validations show that without knowledge of skeletal material properties, which are unknowable from fossilized tissues, absolute performance values such as breaking stresses cannot be accurately determined. The true power of paleontological FEA therefore lies in the ability to manipulate virtual representations of morphology, to make relative comparisons between models, and to quantitatively assess how evolutionary changes of shape result in functional adaptations.

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L'Anson, R., J. Peña, R. Postic und J.-P. Barret. „Finite Element Analysis Applied to Radial Aircraft Tyre Engineering“. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, Nr. 1 (Januar 1996): 109–16. http://dx.doi.org/10.1243/pime_proc_1996_210_349_02.

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The application of finite element analysis (FEA) to the design of radial aircraft tyres is shown to be an effective and efficient tool which can be used for conducting tyre and tyre wheel design studies. This paper describes the specific conditions under which FEA is applied by Michelin to the radial aircraft tyre, and presents an example of its application to the analysis of the tyre and wheel rim contact pressures. Model definition, calculated tyre displacement and rim contact pressure distributions are included. Validation of the FEA prediction against experimental results is demonstrated for a main landing gear tyre.

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Kim, Hong Seok, Muammer Koç, Jun Ni und Amit Ghosh. „Finite Element Modeling and Analysis of Warm Forming of Aluminum Alloys—Validation Through Comparisons With Experiments and Determination of a Failure Criterion“. Journal of Manufacturing Science and Engineering 128, Nr. 3 (19.09.2005): 613–21. http://dx.doi.org/10.1115/1.2194065.

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In this study, thermomechanically coupled finite element analysis (FEA) was performed for forming aluminum rectangular cups at elevated temperatures. In order to identify the onset of a failure during FEA, applicability, accuracy, and repeatability of three different failure criteria (maximum load, minimum thickness, and thickness ratio) were investigated. The thickness ratio criterion was selected since it resulted in accurate prediction of necking-type failure when compared with experimental measurements obtained under a variety of warm forming conditions. Predicted part depth values from FEA at various die-punch temperature combinations and blank holder pressures conditions were also compared with experiments, and showed good agreement. Forming limit diagrams were established at three different warm forming temperature levels (250°C, 300°C, and 350°C). An increasing limiting strain was observed with increasing forming temperature both in FEA and experiments. In addition, strain distributions on the formed part obtained under different die-punch temperature combinations were also compared to further validate the accuracy of FEA. A high temperature gradient between die and punch (Tdie>Tpunch) was found to result in increased formability; i.e., high part depths.

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Tarfaoui, Mostapha, und Papa Birame Gning. „Experimental Investigation and Finite Element Analysis of Dynamic Behavior and Damage of Glass/Epoxy Tubular Structures“. Key Engineering Materials 471-472 (Februar 2011): 951–56. http://dx.doi.org/10.4028/www.scientific.net/kem.471-472.951.

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This paper presents finite element analysis (FEA) of static and dynamic tests of thick filament wound glass/epoxy tubes. The first part involves the validation of elastic properties and identification of damage initiation and its development in dynamic tests. The results of FEA of the dynamic tests without damage appeared satisfactory. An impact model, including material property degradation, is used for damage prediction. The simulated damage is compared with that obtained experimentally. The sizes of projected and cumulated surfaces are of the same order of magnitude as in the experimental measurements.

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Zhang, Peng, Song He, Michael C. Muir und G. S. J. Gautam. „Eccentricity Effects on NVH Performance of Interior Permanent Magnets Machines for Hybrid and Electric Vehicles“. INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, Nr. 4 (01.08.2021): 2384–92. http://dx.doi.org/10.3397/in-2021-2124.

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For the hybrid electric vehicles (HEVs) and electric vehicles (EVs) applications, the electric machine drive unit system provides the main noise source, especially in the presence of faults. Eccentricity is one of the most common faults, which is mainly caused by the motors' package design and assembling process. There are four main types of eccentricity for motors: static offset, dynamic offset, static tilt and dynamic tilt, which are presented and analyzed. Both two-dimensional (2D) and 3-dimentional (3D) finite element analysis (FEA) are utilized in the electromagnetic field analysis for an Interior Permanent Magnet (IPM) motor. The corresponding methodologies for the mesh and force mapping to the mechanical FEA for the NVH analysis are presented. The NVH test shows that both 2D and 3D FEA can provide reasonable accuracy for the motor eccentricity fault analysis. The 2D FEA is the most common method used in the design optimization and early performance prediction for electrical. For the 3D FEA, due to the high requirement for the computer hardware and computation capability, it is usually used in the final validation for electrical machines' performance. The sensitivity of motor performance versus the airgap heights and eccentricities are studied.

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Dissertationen zum Thema "FEA validation"

Lashore, Michael. „Mathematical Model Validation of a Center of Gravity Measuring Platform Using Experimental Tests and FEA“. DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1467.

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This thesis sets out to derive an analytical model for a center of gravity (CG) measuring platform and examines its validity through experimental testing and Finite Element Modeling. The method uses a two-stage platform tilting process to first locate the planar CG coordinates and then find the third CG coordinate normal to the platform. An uncertainty model of the measuring platform was also developed, both CG and uncertainty models were implemented in the form of a MATLAB code. A load cell sizing task was also added to the code to assist the Integration Engineers at Jet Propulsion Laboratory in selecting load cells to design their own version of the CG Platform. The constructed CG Platform for this project used an array of six strain gauges, four C2A-06-062LT-120 Tee Rosettes and two C2A-06-031WW-120 Stacked Rosettes. They were bonded onto the legs of three truss shaped bipods. Results from the Platform Tilting Tests could not be used to validate the CG model as the measured CG and weight values found from the experimental tests contained a considerable amount of error. The errors in the Platform Tilting Tests are believed to stem from the initial errors observed during the bipod rod and strain gauge calibration tests. As an alternative, an FE model of the CG measuring platform was created as another means of validation. The math model of the CG measuring platform was successfully validated by showing that there was less than a 0.01% different between the bipod loads predicted from the MATLAB code and the FE model. Using the FEM generated loads as inputs into the CG code to calculate a CG matched the initial point mass or CG created in the FE model within a 0.01% difference. To validate the CG model even further, another test should be performed using a CG Platform prototype instrumented with load cells to generate new experimental data and compare them with the results from the FE model.

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Longmire, Leala S. „Design, Optimization, and Validation of a Rear Subframe to allow for the Integration of an Electric Powertrain“. The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594907186413918.

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Rydman, Joakim. „Validation of blast simulation models via drop-tower tests“. Thesis, Umeå universitet, Institutionen för fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-149403.

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This study aims to validate a screw joint simulation model used by BAE Systems in LS-DYNA during blast simulations. It is important that the screw joint simulation model is physically correct, since the simulation results can influence major design decisions. The study provides a short overview on the subject of bolts and screws, material deformation and stress and strain in materials, of the finite element method (FEM) and on some specific numerical methods used in this study. BAE Systems started a validation project of the screw joint simulation model in 2015, but it was not finished due to other priorities. In this older project some drop-tower tests measuring the axial force in a screw joint were conducted. These old tests can now serve as validation data for the screw joint simulation model. The screw joint simulation model used by BAE Systems is dependent on a special kind of finite element formulation; a so called beam element. This study provides a finite element analysis on this simulation model, which is implemented through an established industry FEM solver called LS-DYNA. The validation of the screw joint simulation model is done against three drop-tower experiments performed at 900, 1000 and 1100mm drop height respectively. The drop-tower experiments were replicated in LS-DYNA, with a prescribed velocity on the falling parts rather than simulating a free fall and non-elastic impact. A comparison between the simulation model using beam elements, that is used by BAE Systems, and a similar simulation model using solid elements is presented as part of the validation. To make sure that the result of the study is confident, a local mesh convergence study and a study of the mass scaling numerical method in LS-DYNA is also presented. The results show that the screw joint simulation model using beam elements is valid according to the available experimental data. In one of the experiments, where the drop-test was performed twice, an average maximum force on the screw was measured to be 33.5+-4.8 kN. Simulations of the same case, under the same conditions, using beam elements resulted in a maximum force on the screw of 35.4 kN, well within the experimental result range. In the other two drop-tower experiments, the simulated results showed correlation considering the error sources in the simulation model and the statistical spread that is present in the experimental results. The simulation model using beam elements is also similar to the results using solid elements, which also indicates that the beam model is valid. All in all, it is shown that the beam model can be used to produce safe results that either overestimate or place the simulations of the axial force in the screw in the upper spread of the measurements.

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Sylliaasen, Scott J. „The Development and Validation of a Finite Element Model of a Canine Rib For Use With a Bone Remodeling Algorithm“. DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/415.

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Studies are currently being performed to determine the effects of bisphosphonate treatments on the structure and density of bone tissue. One of the pathways for gaining a better understanding of the effects of this and other treatments involves creating a computer simulation. Theory suggests that bone tissue structure and density are directly related to the manner in which the tissue is loaded. Remodeling is the process in which bone tissue is resorbed in areas of low stress distributions, and generated in areas of high stress distributions. Previous studies have utilized numerical methods and finite element methods to predict bone structure as a result of stress distributions within the tissues. The Finite Element method was chosen for this study. This study was done on a canine (beagle) rib. The goal of this study was to develop an FEA model of the rib that would be used in conjunction with a bone remodeling algorithm, to model the behavior of the bone tissue. Appropriate boundary conditions, loads, and loading cycles were determined from literature, and applied. Respiration was assumed as the dominating activity; therefore the muscles involved in respiration were the primary source of the rib loading. The model also included an integrated UMAT sub-routine, which utilized data from the FEA model to iterate bone tissue densities and structures. The model closely predicted the porosities of the bone tissue, when compared to actual tissue samples, as well as what literature describes.

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Walters, David Michael. „Design, Validation, and Optimization of a Rear Sub-frame with Electric Powertrain Integration“. The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437665533.

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Procházka, Vojtěch. „Výpočtová analýza oka ramene nápravy osobního automobilu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443750.

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This thesis is focused on behavior of control arm opening with bushing pressed in. The tested component is a part of control arm of a car. The parts were tested in tensile and compressive strength. Real experiments were measured by optical system Aramis during the testing to determine deformations of the part. These tests are also modeled by a finite element method using an Abaqus software. In GOM Correlate software is created full-field comparison of deformation results from Aramis and FEA. Based on this comparison computational model is calibrated. Sensitivity analysis is performed at the end of the thesis.

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Maranhão, César Miguel Ramos. „FEM analysis in machining and experimental validation“. Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/2460.

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Mestrado em Engenharia Mecânica
A presente investigação contempla a simulação numérica e validação experimental de processos de maquinagem. O estudo consiste na simulação numérica da maquinagem de materiais de alto desempenho como a liga de alumínio 7075 e o aço inox AISI 316 com validação experimental. Diversas simulações e validações foram conduzidas de modo a cobrir uma gama de parâmetros de maquinagem. Forças de corte e de avanço, potência de maquinagem, máxima temperatura de corte e deformação plástica foram validadas com sucesso. Finalmente, foram modeladas outras grandezas nomeadamente tensões residuais no aço inoxidável. ABSTRACT: The present investigation contemplates numerical simulation and experimental validation of machining processes. The study consists in simulating the machining of high performance materials like aluminium alloy 7075 and stainless steel AISI 316 with experimental validation. Several simulations and validations were conducted in order to cover a wide range of machining parameters. Cutting and feed forces, cutting power, maximum cutting temperature and plastic strain were validated with success. Finally, residual stresses in stainless steel were also modelled.

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Moravej, Maryam. „Développement et validation des matériaux métalliques pour stents cardiovasculaires biodégradables par dépôt électrolytique“. Thesis, Université Laval, 2011. http://www.theses.ulaval.ca/2011/27897/27897.pdf.

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Les stents coronariens métalliques dégradables émergent comme une alternative possible aux stents permanents fabriqués à partir de métaux résistants à la corrosion comme l'acier inoxydable 316L. Le fer pur est un candidat intéressant pour les stents dégradables en termes de propriétés mécaniques, de dégradation et de biocompatibilité. Ce projet est le premier à étudier la faisabilité d’utiliser l'électroformage pour produire le fer comme matériau structural dans les stents dégradables. Dans ce projet, un processus de dépôt électrolytique a d’abord été développé. Les couches de fer produites ont une microstructure fine, une limite élastique élevée ainsi qu’une résistance à la traction ayant des valeurs comparables à celles de l'acier inoxydable 316L. Un traitement thermique de recuit à 550 ˚C pendant 1 h a produit une recristallisation dans le fer et a amélioré sa ductilité de 8 à 18 %. Des tests de corrosion par polarisation potentiodynamique et par immersion statique et dynamique ont permis l’étude de la dégradation du fer électroformé en solution de Hank. Il a été montré que le fer électrodéposé se corrode plus rapidement que le fer Armco ® déjà implanté comme stents biodégradables. L'effet de la densité de courant en tant que paramètre de l'électroformage sur la microstructure et la dégradation de fer a aussi été étudié. L’étude de diffraction d'électrons rétrodiffusés (EBSD) a montré que différentes microstructures, y compris la taille des grains et la texture, peuvent être produites à différentes densités de courant de 1 à 10 A dm-2. Le plus haut taux de dégradation a été obtenu pour le fer fabriqué à 5 A dm-2, car celui-ci possède la plus petite taille de grains et ceux-ci sont équiaxes avec des orientations aléatoires qui présentent un plus grand volume de joints de grains entraînant un taux de dégradation plus rapide. Enfin, le procédé d’électroformage a été appliqué avec succès pour la fabrication de mini-tubes de fer. Les mini-tubes de fer ont été électroformés sur les échantillons cylindriques d’étain qui ont été décollés par fusion du substrat après le processus. Les mini-tubes ont ensuite été utilisés pour la fabrication de stents de fer par découpe au laser. Les stents de fer ont montré une taille moyenne des grains de 5 µm après recuit et décapage à l'acide. Cette taille du grain est plus fine que celle généralement obtenue pour des stents SS 316L et pourrait fournir des propriétés mécaniques élevées et une dégradation ciblée pour les stents de fer électroformés.
Degradable metallic coronary stents have emerged as possible alternatives for permanent stents fabricated from corrosion-resistant metals such as 316L stainless steel (316L SS). Pure iron has shown to be an interesting candidate for degradable stents in terms of mechanical properties, degradation and biocompatibility. This project is the first to investigate the feasibility of using electroforming process for production of iron for degradable stents where the material is used for a load-bearing application. In this project, firstly, an electroforming process was developed. The produced iron foils showed a fine microstructure and high yield and tensile strength were also obtained comparable to those of 316L SS. Annealing at 550˚C for 1h induced recrystallization in iron and improved its ductility from 8 to 18%. The investigation of the degradation of electroformed iron in Hank’s solution using potentiodynamic polarization, static immersion and dynamic degradation tests showed that it corrodes faster than Armco® iron previously investigated for degradable stents. The effect of current density as an electroforming parameter on the microstructure and thereby the degradation of iron was also studied. Electron backscatter diffraction (EBSD) showed that different microstructures including grain size and texture were produced at different current densities from 1-10 A dm-2. The highest degradation rate was obtained for iron fabricated at 5 A dm-2 since it possesses small grain size and equiaxed grains with random orientations providing more grain boundary volume can be held responsible for its faster degradation rate compared to the other iron samples. Finally, the electroforming process was successfully applied for the fabrication of iron tubes. Iron tubes were electroformed on Sn cylinders which were separated from them by melting after the process. The tubes were then used for the fabrication of iron stents by laser-cutting. Iron stents fabricated from electroformed tubes demonstrated an average grain size of 5 µm after annealing and acid-pickling. This grain size is finer than what usually obtained for 316L SS stents and could potentially provide high mechanical properties and targeted degradation for electroformed iron stents.

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Caycho-Rodríguez, Tomás, José M. Tomás, Miguel Barboza-Palomino, José Ventura-León, Miguel Gallegos, Mario Reyes-Bossio und Lindsey W. Vilca. „Assessment of Fear of COVID-19 in Older Adults: Validation of the Fear of COVID-19 Scale“. Springer, 2021. http://hdl.handle.net/10757/655711.

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There is no information in Peru on the prevalence of mental health problems associated with COVID-19 in older adults. In this sense, the aim of the study was to gather evidence on the factor structure, criterion-related validity, and reliability of the Spanish version of the Fear of COVID-19 Scale (FCV-19S) in this population. The participants were 400 older adults (mean age = 68.04, SD = 6.41), who were administered the Fear of COVID-19 Scale, Revised Mental Health Inventory-5, Patient Health Questionnaire-2 items, and Generalized Anxiety Disorder Scale 2 items. Structural equation models were estimated, specifically confirmatory factor analysis (CFA), bifactor CFA, and structural models with latent variables (SEM). Internal consistency was estimated with composite reliability indexes (CRI) and omega coefficients. A bifactor model with both a general factor underlying all items plus a specific factor underlying items 1, 2, 4, and 5 representing the emotional response to COVID better represents the factor structure of the scale. This structure had adequate fit and good reliability, and additionally fear of COVID had a large effect on mental health. In general, women had more fear than men, having more information on COVID was associated to more fear, while having family or friends affected by COVID did not related to fear of the virus. The Spanish version of the Fear of COVID-19 Scale presents evidence of validity and reliability to assess fear of COVID-19 in the Peruvian older adult population.

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Cabrera, Carlos Andres Cuenca. „Ductile failure prediction using phenomenological fracture model for steels: calibration, validation and application“. Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-27082018-075853/.

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The present thesis shows the analysis, calibration, and application of the stress modified criticai strain criterion to predict ductile failure for an A285 steel. To obtain the mechanical behavior of the material, experimental tests were carried out by implementation of 5 different types of geometries: smooth round bar, notched round bar (R=1 , 2, 3 mm), and, deep and shallow cracked SE(B) specimens. Then, for the calibration process of the mechanical properties finite element models were generated, using 30 solid elements with 8 nodes (C308), matching the geometry and the properties of the tested specimens. To calibrate the elastoplastic behavior was used the experimental and numerical response obtained from the smooth and notched round bar specimens; and, for the damage calibration was used the responses obtained from both deep and shallow crack SE(B) specimens. Once the mechanical properties were calibrated, then there were obtained the SMSC criterion factors represented by the equation ..... and, the damage condition which is represented by the displacement at failure (.......) and exponential factor (....). This calibrated model was able to recover the SE(B) experimental responses that validate the use of the characterized material in a complex structure. Then, the fully characterized material was applied in two pipelines which have externai initial circumferential elliptical crack; being the first one pipe with shallow crack and the second one with deep crack. Finally, both pipes were submitted to tension loads to predict the ductile damage behavior, obtaining the necessary load to the crack start growing, and the evolution of the failure.
A presente dissertação apresenta o processo de análise, calibração e aplicação das propriedades mecânicas, incluindo o comportamento elastoplástico e de dano, para o aço A285, utilizando o critério \"Stress modified criticai strain\" (SMCS). Para obter o comportamento mecânico do material, testes experimentais foram realizados com a implementação de 5 tipos diferentes de geometrias: barra cilíndrica sem entalhe, barra cilíndrica com entalhe (R = 1, 2, 3 mm) e corpos de prova SE(B) com trinca inicial profunda e rasa. Para o processo de calibração das propriedades mecânicas foram gerados modelos de elementos finitos, utilizando elementos sólidos 30 com 8 nós (C3D8), que representam de forma adequada a geometria e as propriedades dos corpos de prova testados. Para calibrar o comportamento elastoplástico e iniciação do dano, utilizou-se a resposta experimental e numérica obtida para as amostras de barra cilíndrica com e sem entalhe; e, para a calibração da evolução do dano, foram utilizadas as respostas obtidas para os espécimes SEB de trincas profundas e rasa. Este modelo calibrado foi capaz de recuperar as respostas experimentais dos corpos de prova SE(B), o que valida o uso do material caracterizado em uma estrutura complexa. Uma vez calibradas as propriedades mecânicas, foram obtidos os fatores do critério SMSC representados pela equação ....... , e, a condição de dano que é representada pelo deslocamento na falha .... e o fator de amolecimento exponencial .... . Depois, o material totalmente caracterizado foi aplicado em dois dutos que possuem trinca elíptica circunferencial inicial externa; sendo o primeiro tubo com trinca superficial e o segundo com trinca profunda. Finalmente, ambos os tubos foram submetidos a cargas de tensão para prever o comportamento do dano dúctil, obtendo a carga necessária para o início do crescimento da trinca e a evolução da falha.

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Bücher zum Thema "FEA validation"

Draft Guideline on Validation of Analytical Procedures for Pharmaceuticals (Fda Harmonisation). Interpharm Pr, 1994.

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Haider, Syed Imtiaz. Pharmaceutical Master Validation Plan: The Ultimate Guide to FDA, GMP, and GLP Compliance. Informa Healthcare, 2001.

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Stokes, David. Testing Computers Systems for FDA/MHRA Compliance (Computer Systems Validation Life Cycle Activities). Informa Healthcare, 2003.

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Pharmaceutical Computer Validation Introduction Manual and CD, GMP (Good Manufacturing Practices) Training Introduction To Meet FDA Regulations in the ... on Computer System Validation and Part 11. UniversityOfHealthCare, 2003.

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Farb, Daniel. Pharmaceutical Computer Validation Introduction 5 Users: GMP (Good Manufacturing Practices) Training Introduction to Meet FDA Regulations in the Use of ... on Computer System Validation and Part 11. UniversityOfHealthCare, 2005.

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Part 11 and Computer Validation Manual and CD, The FDA Regulations on Part 11, Electronic Records and Electronic Signatures, For Pharmaceutical, Medical ... Emphasis on Computer System Validation a. UniversityOfHealthCare, 2003.

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Guide to Inspections of Oral Solid Dosage Forms-Pre/Post Approval Issues for Development and Validation (Fda Inspection Guidelines). Interpharm Pr, 1994.

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PIAE EUROPE 2021. VDI Verlag, 2021. http://dx.doi.org/10.51202/9783181023853.

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Contents Structural components/Strukturbauteile Development of an energy-absorbing structural element made of polyamide integrated in the plastic front-end carrier of the new Mercedes S-Class ..... 1 Entwicklung eines energieabsorbierenden Strukturelements aus Polyamid integriert im Kunststoff-Frontendträger der neuen Mercedes S-Klasse ..... 5 BAGS: Highly-integrated front-end module carrier ..... 9 BAGS: Hochintegrierter Front End Modulträger ..... 19 Surfaces/Oberflächen Lightweight plastic construction with visible surface as examplified by the Volkswagen ID 3 tailgate ..... 29 Kunststoffleichtbau mit Sichtoberfläche am Beispiel der Heckklappe Volkswagen ID3 ..... 39 Breakthrough in producing soft and sustainable interior surfaces by injection moulding of TPE ..... 49 Simulation The all-new MAN high-roof cab – epoxy sandwich RTM – simulated using FEM and crashed under real conditions ..... 61 Epoxid-Sandwich-RTM – FEM gerechnet und real gecrasht ..... 75 Development and validation of a simulation methodology for the prediction of surface defects for plastic components with metallic effect pig...

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Celik, I. Experimental and Computational Aspects of Validation of Multiphase Flow Cfd Codes: Presented at the 1994 Asme Fluids Engineering Division Summer Meeti (Fed). American Society of Mechanical Engineers, 1994.

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ELIV 2019. VDI Verlag, 2019. http://dx.doi.org/10.51202/9783181023570.

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Der Bericht ist ausschließlich als PDF-Dokument erschienen! Content Foreword 1 ADAS Seeing With Sound – Next-level 3D ultrasonic sensors based on echolocation 5 N. Knappstein, Toposens, Munich Ensuring the reliability, availability and safety of fully automated and autonomous transport systems through modern system architectures 11 J. Heinrich, A. Braasch, Institut für Qualitäts- und Zuverlässigkeitsmanagement GmbH, Wuppertal; F. Plinke, Institut für Qualitäts- und Zuverlässigkeitsmanagement GmbH, Hamburg ADAS/AD Systems: Efficient Testing & Validation – From data acquisition to data analytics 21 M. Kremer, M. Kreutz, M. Luxen, S. Christiaens, FEV Europe GmbH, Aachen Problems and solution spaces for driver-initiated handover from automatic to manual driving mode 31 J. Klesing, Nexteer Automotive, Auburn Hills, USA; S. Safour, Nexteer Automotive, Paris, France UX User-centred development of a display concept for fully automated driving – A methodical approach 45 L. Gaue...

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Buchteile zum Thema "FEA validation"

Saouma, Victor, Alain Sellier, Stéphane Multon und Yann Le Pape. „Benchmark Problems for AAR FEA Code Validation“. In Diagnosis & Prognosis of AAR Affected Structures, 381–410. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44014-5_21.

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Kelleher, Jordan E., Michael D. Hayward und Paul J. Gloeckner. „Connecting Rod FEA Validation Using Digital Image Correlation“. In Advancement of Optical Methods in Experimental Mechanics, Volume 3, 157–62. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22446-6_20.

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Patel, Jash H., Vinayak H. Khatawate, Gaurav Jain und Param Shah. „Static Analysis of Tripod Housing Using FEA and Its Validation“. In Proceedings of International Conference on Intelligent Manufacturing and Automation, 763–76. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4485-9_75.

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Sonawane, Ishan, und A. Muthuraja. „FEA Validation of Experimental Results of First Ply Failure of Composite Structure“. In Lecture Notes on Multidisciplinary Industrial Engineering, 947–54. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9072-3_79.

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Moorcroft, David M., und Joseph Pellettiere. „Impact of Numerical Model Verification and Validation Within FAA Certification“. In Model Validation and Uncertainty Quantification, Volume 3, 249–55. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15224-0_26.

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Burdick, Richard K., David J. LeBlond, Lori B. Pfahler, Jorge Quiroz, Leslie Sidor, Kimberly Vukovinsky und Lanju Zhang. „Process Design: Stage 1 of the FDA Process Validation Guidance“. In Statistical Applications for Chemistry, Manufacturing and Controls (CMC) in the Pharmaceutical Industry, 115–54. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50186-4_3.

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Burdick, Richard K., David J. LeBlond, Lori B. Pfahler, Jorge Quiroz, Leslie Sidor, Kimberly Vukovinsky und Lanju Zhang. „Process Qualification: Stage 2 of the FDA Process Validation Guidance“. In Statistical Applications for Chemistry, Manufacturing and Controls (CMC) in the Pharmaceutical Industry, 155–72. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50186-4_4.

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Stefania, Spada, Germanà Danila, Sessa Fabrizio und Lidia Ghibaudo. „FCA Ergonomics Proactive Approach in Developing New Cars: Virtual Simulations and Physical Validation“. In Advances in Intelligent Systems and Computing, 57–63. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41627-4_6.

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Chen, Yixiong, Yang Yang, Zhanyao Lei, Mingyuan Xia und Zhengwei Qi. „Bootstrapping Automated Testing for RESTful Web Services“. In Fundamental Approaches to Software Engineering, 46–66. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-71500-7_3.

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AbstractModern RESTful services expose RESTful APIs to integrate with diversified applications. Most RESTful API parameters are weakly typed, which greatly increases the possible input value space. This poses difficulties for automated testing tools to generate effective test cases to reveal web service defects related to parameter validation. We call this phenomenon the type collapse problem. To remedy this problem, we introduce FET (Format-encoded Type) techniques, including the FET, the FET lattice, and the FET inference to model fine-grained information for API parameters. Enhanced by FET techniques, automated testing tools can generate targeted test cases. We demonstrate Leif, a trace-driven fuzzing tool, as a proof-of-concept implementation of FET techniques. Experiment results on 27 commercial services show that FET inference precisely captures documented parameter definitions, which helps Leif to discover 11 new bugs and reduce $$72\% \sim 86\%$$ 72 % ∼ 86 % fuzzing time as compared to state-of-the-art fuzzers.

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Burdick, Richard K., David J. LeBlond, Lori B. Pfahler, Jorge Quiroz, Leslie Sidor, Kimberly Vukovinsky und Lanju Zhang. „GMP Monitoring and Continuous Process Verification: Stage 3 of the FDA Process Validation Guidance“. In Statistical Applications for Chemistry, Manufacturing and Controls (CMC) in the Pharmaceutical Industry, 173–91. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50186-4_5.

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Konferenzberichte zum Thema "FEA validation"

Marjani, Mehrsa, Moustafa El-Gindy, David Philipps, Fredrik Öijer und Inge Johansson. „FEA Tire Modeling and Validation Techniques“. In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46514.

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Recent advances in power and efficiency of computerized modeling methods has made it easier to develop accurate tire models. These newer models are now created with such accuracy that it has become easy to predict the experimental tire’s behavior and characteristics. These models are helpful with determining tire, tire-road, and tire-soil interaction properties. By creating virtual models, the overall capital for research and development can be reduced as well as replacing unavailable experimental tires for research. This research paper mainly focuses on the validation of computer generated FEA tire models which are then used for the prediction of the experimental tire’s rolling resistance, static and dynamic characteristics. Experimental data, such as rolling resistance and vertical acceleration are used in validation simulations in order to tune the virtual model to match the experimental tire’s behavior. The tire that was used for this research is a six-groove 445/50R22.5 FEA truck tire, which was constructed and validated over the course of this research.

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Derradji-Aouat, Ahmed, Melanie Sarzynski und Roger Cordes. „Iceberg Ice Constitutive Modeling and FEA Validation“. In OTC Arctic Technology Conference. Offshore Technology Conference, 2015. http://dx.doi.org/10.4043/25590-ms.

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Pike, Kelly, Z. C. Lin und Alan Tahran. „SEM Validation Technique for FEA of Small Specimens“. In ASME 2007 2nd Frontiers in Biomedical Devices Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/biomed2007-38038.

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The use of the SEM to make direct surface measurements on small test specimens enables the FEA analyst to construct and validate an individual specimen model. The technique is also valuable to engineers so that they can calibrate their fatigue test samples before and after fatigue test regimes.

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Zhou, Lei, Quinn Leland, Earl Gregory, Wendell Brokaw, Louis Chow, Yeong-Ren Lin, Jared Bindl et al. „Lumped Node Thermal Modeling of EMA with FEA Validation“. In Power Systems Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2010. http://dx.doi.org/10.4271/2010-01-1749.

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Salleh, Mohd Rizal, Qing Ping Yang, Peng Wei und Barry Jones. „Experimental Validation of FEA Modeling of Touch Trigger Probes“. In 2007 IEEE Instrumentation & Measurement Technology Conference IMTC 2007. IEEE, 2007. http://dx.doi.org/10.1109/imtc.2007.379096.

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Zhao, Tianwen (Tina), Amy Martinez und Hengchu Cao. „Experimental Validation of SAPIEN Transcatheter Heart Valve FEA Models“. In ASME 2013 Conference on Frontiers in Medical Devices: Applications of Computer Modeling and Simulation. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fmd2013-16053.

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The Edwards SAPIEN transcatheter heart valve (Figure 1) is designed for heart valve replacement in patients with severe aortic stenosis without open-heart surgery. Physiological FEA analyses have been performed to provide an assessment of the fracture and fatigue resistance of the device during deployment and operation. The present study validates FEA frame models by comparing the crimping behavior of the FEA models with the results of crimping experiments.

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Marzola da Cunha, Luís Fernando, Matheus Lisboa Cardoch Valdes, Rhander Viana, Danilo dos Santos Oliveira und Luiz Eduardo Rodrigues Vieira. „CHASSIS TORSIONAL RIGIDITY: VALIDATION OF FEA DATA BY EXPERIMENTAL TEST“. In 25th International Congress of Mechanical Engineering. ABCM, 2019. http://dx.doi.org/10.26678/abcm.cobem2019.cob2019-2174.

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Taylor, William, Joe Fuehne, Richard Lyon, Jaesu Kim und J. K. Lee. „FEA Simulation and Experimental Validation of Catalytic Converter Structural Integrity“. In SAE 2000 World Congress. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2000. http://dx.doi.org/10.4271/2000-01-0219.

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Koyama, Masato, Takahiro Mikami und Yasutaka Fujimoto. „Validation of spiral motor parameters by FEA and experimental identification“. In 2013 IEEE 22nd International Symposium on Industrial Electronics (ISIE). IEEE, 2013. http://dx.doi.org/10.1109/isie.2013.6563856.

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Abdennadher, I., R. Kessentini und A. Masmoudi. „Analytical derivation and FEA validation of the inductances of CWPMM“. In 2009 6th International Multi-Conference on Systems, Signals and Devices (SSD). IEEE, 2009. http://dx.doi.org/10.1109/ssd.2009.4956711.

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Berichte der Organisationen zum Thema "FEA validation"

Park, Byoung, Richard Leavy und John Henry Niederhaus. Penetration of rod projectiles in semi-infinite targets : a validation test for Eulerian X-FEM in ALEGRA. Office of Scientific and Technical Information (OSTI), März 2013. http://dx.doi.org/10.2172/1088058.

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Park, Byoung Y., R. B. Leavy und John H. Niederhaus. Penetration of Rod Projectiles in Semi-Infinite Targets: A Validation Test for Eulerian X-FEM in Alegra. Fort Belvoir, VA: Defense Technical Information Center, März 2013. http://dx.doi.org/10.21236/ada580847.

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NUMERICAL STUDY ON SHEAR BEHAVIOUR OF ENHANCED C-CHANNELS IN STEEL-UHPC-STEEL SANDWICH STRUCTURES. The Hong Kong Institute of Steel Construction, September 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.4.

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This paper firstly developed a three-dimensional (3D) finite element model (FEM) for enhanced C-channels (ECs) in steel-UHPC-steel sandwich structures (SUSSSs). The FEM was validated by 12 push-out tests on ECs with UHPC. With the validated FEM, this paper performed in-depth parametric studies on shear behaviours of ECs with ultra-high performance concrete (UHPC). These investigated parameters included bolt-hole gap (a), grade (M) and diameter (d) of bolt, core strength (fc), length of C-channel (Lc), and prestressing force ratio on bolt (ρ) in ECs. Under shear forces, the ECs in UHPC exhibited successive fractures of bolts and C-channels. Increasing the bolt-hole gap within 0-2 mm has no harm on the ultimate shear resistance, but greatly improves the slip capacity of ECs. Increasing grade and diameter of bolts improves the shear resistance and ductility of ECs through increasing the PB/PC (shear strength of bolt to that of C-channel) ratio. Increasing the core strength increased the shear resistance, but reduced the ductility of ECs due to the reduced PB/PC ratio. The ECs with Lc value of 50 mm offer the best ductility. Prestressing force acting on the bolts reduced the shear strength and ductility of ECs with UHPC. Analytical models were proposed to estimate the ultimate shear resistance and shear-slip behaviours of ECs with UHPC. The extensive validations of these models against 12 tests and 31 FEM analysis cases proved their reasonable evaluations on shear behaviours of ECs with UHPC.

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