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Dissertations / Theses on the topic 'Plastic design'
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Kaartinen, Johanna. "A Checklist for Plastic Product Design: Preventing Pitfalls in a Design Process and Premature Failures of Plastic Products." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-9683.
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Designing an injection molded plastic part requires optimizing the part with respect to various stakeholders’ needs throughout its life cycle. The conditions in which a product is operating in service are often inadequately understood or specified, resulting in wrong material selection, which in turn leads to failure when the product is used. Many aspects interrelate with the initial part design and the essential rules of each should be taken into account to ensure a well-functioning plastic product. Regardless, a part design often passes sequentially from concept development to the manufacturing phase with features that unnecessarily complicate production, add costs and weaken the intended embodiment of the product. Therefore, a checklist was developed to ensure that oversights do not happen and verify that a design fulfills the requirements set for it. The commissioning company in the project was the design office Sytyte Oy. The aim of this thesis work was to investigate the effects of design decisions on the product’s feasibility and performance in service. The study focused on the underlying reasons for failures in plastic products, failure phenomena and ways of preventing them. The project started with literature research. To support the theoretical review, a small-scale survey was conducted among operators in plastic industry in Finland to strengthen the outcome of the project. The findings from the research were compiled into a checklist. The approach into the list was adopted from the FMEA method aiming to create a stripped-down version of it. The result offers a tool for anticipating and spotting possible failures by bringing up the influences that most frequently affect the part performance. It contributes to preventing delays in processing and premature failures in service. The checklist was verified by specialist consultation to receive suggestions and requirements for improvements and to ensure its reliability.
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Nilsson, Ola, and Ronny Winquist. "Design of an integrated plastic device." Thesis, Halmstad University, School of Business and Engineering (SET), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-2542.
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Midkiff, Corey J. "Plastic voided slab systems: applications and design." Kansas State University, 2013. http://hdl.handle.net/2097/16874.
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Master of ScienceDepartment of Architectural Engineering
Kimberly Waggle Kramer
Reinforced concrete slabs are one of the most common components in modern building construction. Reinforced concrete slabs with plastic voids slabs are a new and innovative type of structural, concrete slab system developed to allow for lighter self-weight of the structure while maintaining similar load carrying capacity of a solid slab. Plastic voided slabs are capable of reducing the amount of concrete necessary to construct a building by 30 percent or more. This reduction can be beneficial in terms of financial savings as well as building performance. This report examines a two-way, reinforced concrete slab with plastic voids construction in comparison to traditional flat plate reinforced concrete slab construction. The design process for plastic voided slabs is directly compared with traditional two-way flat plate reinforced concrete slabs through a design comparison of typical bays of 20’ by 20’ (6m by 6m), 25’ by 25’ (7.6m by 7.6m), 30’ by 30’ (9m by 9m) and 35’ by 35’ (10.7m by 10.7m). The traditional slab design process follows the ACI 318-11 Building Code Requirements for Structural Concrete chapter 13 Direct Design Method, while the plastic voided slab design process is modified from the BubbleDeck Design Guide for compliance with BCA using AS3600 and EC2. Sizes of traditional slab bays are compared to sizes of plastic voided slab bays. Results of the comparison study are presented.
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Slaughter, Andrew Edward. "Design and fatigue of a structural wood-plastic composite." Online access for everyone, 2004. http://www.dissertations.wsu.edu/Thesis/Summer2004/a%5Fslaughter%5F072704.pdf.
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Masuku, Eric S. "Intelligent CAD mould design for injection moulding." Thesis, University of Bath, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323605.
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Tam, Thomas Kam-Hung. "Computer methods for optimal plastic design of frames." Thesis, Queen's University Belfast, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317120.
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Buys, Alexander George. "Performance evaluation of aluminium alloy 7075 for use in tool design for the plastic industry." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1246.
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Thesis (MTech (Mechanical Engineering))--Cape Peninsula University of Technology, 2009.The objective of this project was to measure the performance of high-strength aluminium alloys as injection mould material compared against conventionally used tool steel.
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Leinster, James Carson. "The design of steel frames using plastic theory." Thesis, Queen's University Belfast, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277487.
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Noteware, Madison Leigh. "Application of plastic design in steel table shelters." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111520.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2017.Cataloged from PDF version of thesis. "June 2017."
Includes bibliographical references (pages 59-62).
One of the initial applications of plastic theory of structures was the Morrison Shelter, an indoor air raid shelter designed by John Fleetwood Baker (1901 - 1985) during the Second World War to protect British civilians from unrelenting German air raids. Baker integrated his previous work on plasticity of steel frames into the design of Morrison shelters that employed ductility and continuity, which are key principles of plastic theory. Although Morrison Shelters have been praised for their life saving capability and use of plastic theory, a technical analysis of its design process has been lacking from the historical record. To explore the use of plasticity in the Morrison Shelter's design process, the Baker Papers stored in the Churchill Archives Centre were searched. From these materials, the impact of plasticity on the efficiency of steel frames was critically investigated. This study quantifies the savings in steel due to the use of plastic theory in the design of the Morrison Shelter. The value of savings, which was particularly significant during wartime scarcity, has been previously stated without showing technical verification. The Morrison Shelter's design objectives are still relevant today, particularly in developing nations where the use of plasticity to design steel table-shelters can protect school children in areas of high seismic vulnerability by providing shelters in the form of lightweight steel-framed school desks. The investigation of the concise, plastic calculations used to design the Morrison Shelter serve as inspiration for replication in future applications that need lightweight, simple structures that expect to experience impact loads.
by Madison Leigh Noteware.
M. Eng.
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Zhu, Yan. "Rational design of plastic packaging for alcoholic beverages." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLA020.
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La perception des emballages alimentaires est passée d’utile à source majeure de contaminants dans les aliments et menace pour l’environnement. La substitution du verre par des con-tenants en plastiques recyclés ou biosourcés réduit l’impact environnemental des boissons embouteillées. La thèse a développé de nouveaux outils de simulation 3D et d’optimisation pour accélérer le prototypage des emballages éco-efficaces pour les boissons alcoolisées. La durée de conservation des boissons, la sécurité sanitaire des matériaux plastiques recyclés, les contraintes mécaniques, et la quantité de déchets sont considérées comme un seul problème d'optimisation multicritères. Les nouvelles bouteilles sont générées virtuellement et itérativement en trois étapes comprenant : i) une [E]valuation multiéchelle des transferts de masse couplés ; ii) une étape de [D]écision validant les contraintes techniques (forme, capacité, poids) et réglementaires (durée de conservation, migrations); iii) une étape globale de ré[S]olution recherchant des solutions de Pareto acceptables. La capacité de prédire la durée de vie des liqueurs dans des conditions réelles a été testée avec succès sur environ 500 miniatures en PET (polyéthylène téréphtalate) sur plusieurs mois. L’ensemble de l’approche a été conçu pour gérer tout transfert de matière couplé (perméation, sorption, migration). La sorption mutuelle est prise en compte via une formulation polynaire de Flory-Huggins. Une formulation gros grain de la théorie des volumes libres de Vrentas et Duda a été développée pour prédire les propriétés de diffusion dans les polymères vitreux de l’eau et des solutés organiques dans des polymères arbitraires (polyesters, polyamides, polyvinyles, polyoléfines). 409 diffusivités issues de la littérature ou mesurées ont été utilisée pour validation. La contribution de la relaxation du PET vitreux a été analysée par sorption différentielle (binaire et ternaire) de 25 à 50 °C. Une partie du code source sera partagé afin d'encourager l'intégration de davantage de paramètres affectant la durée de conservation des boissons et des produits alimentaires (cinétique d'oxydation, piégeage d'arômes)The view of plastic food packaging turned from useful to a major source of contaminants in food and an environmental threat. Substituting glass by recycled or biosourced plastic containers reduces environmental impacts for bottled beverages. The thesis developed a 3D computational and optimization framework to accelerate the prototyping of eco-efficient packaging for alcoholic beverages. Shelf-life, food safety, mechanical constraints, and packaging wastes are considered into a single multicriteria optimization problem. New bottles are virtually generated within an iterative three steps process involving: i) a multiresolution [E]valuation of coupled mass transfer; ii) a [D]ecision step validating technical (shape, capacity, weight) and regulatory (shelf-life, migrations) constraints; iii) a global [Solving] step seeking acceptable Pareto solutions. The capacity to predict shelf-life of liquors in real conditions was tested successfully on ca. 500 hundred bottle min iatures in PET (polyethylene terephthalate) over several months. The entire approach has been designed to manage any coupled mass transfer (permeation, sorption, migration). Mutual sorption is considered via polynary Flory-Huggins formulation. A blob formulation of the free-volume theory of Vrentas and Duda was developed to predict the diffusion properties in glassy polymers of water and organic solutes in arbitrary polymers (polyesters, polyamides, polyvinyls, polyolefins). The validation set included 433 experimental diffusivities from literature and measured in this work. The contribution of polymer relaxation in glassy PET was analyzed in binary and ternary differential sorption using a cosorption microbalance from 25 to 50°C. Part of the framework will be released as an open-source project to encourage the integration of more factors affecting the shelf-life of beverages and food products (oxidation kinetics, aroma scalping)
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Nitsche, Tanja Marie. "About Solving and Dissolving : Investigating the design possibilities of bio plastic." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-14906.
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Translating the conceptual term of sustainability into materials and exploring bio plastics in order to generate visually and tacitly intriguing objects are the aims for this project. Other designers and previous projects in the field of textile design showed how the material works in a small scale. This project used the material’s design properties to generate groups of object elements. The three main design properties of the material, transparency, biomorph expression and flexibility, and their opposites, opaqueness, geometric expression and stiffness, were combined in different sets which resulted in the used artistic methodology. Therefore, the material properties and earlier established techniques formed the base for finding the overall forms of the installations. The collection and a book about the surface design possibilities for plant based plastic show how the material can be manufactured. The installations focus on the interplay between colour, light and shadow, material texture and pattern in relation to the overall shape of the object. Moulding, laser cutting and the addition of other ingredients like recycled paper, fibres and mica powder influenced the material’s durability, flexibility, transparency and texture. Experiments revealed that the colours change over time and all of them are highly influenced in their intensity and shade by the light source behind the material. This project visualises how all these factors interact and which techniques and tools are required to process the new material. Moreover, it generates new options for a new formal language and terminology for sustainable interior textiles.
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Butterfield, Joseph. "The development of design procedures for rotomoulded plastic articles." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394461.
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Rios, Erick E. "Design and manufacturing of plastic micro-cantilevers by injection molding." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/18888.
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Li, Likai. "Design, Fabrication and Metrology of Precision Molded Freeform Plastic Optics." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1412162892.
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Mandarim, de Lacerda Maria Elisa. "The use of plastic in utilitarian and functional design objects." Thesis, University of Iowa, 2010. https://ir.uiowa.edu/etd/705.
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Plastic is widely used to shape many of the daily goods produced and consumed today. Compared to wood and metal, this versatile material was recently introduced to society. The technical advances that began in the mid 1850's led to the invention of the first cellulose plastic polymers - a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomer (One Look on line Dictionary, 2009) - to be used at an industrial level. Inaugurating a period in which objects could have the strength of metal or wood, while also being lighter, colorful and cheaper to be manufactured. Plastics are a material that has the ability to be easily shaped (Lefteri, 2008). For me, plastic is ideal to work with, not only because its eclectic applications in product design and manufacture, but also due to its ordinary use in our globalized society.
My master's research is to design functional objects using different types of plastics. My goal is to experiment with this material and understand the industrial production process behind the manufacture of the daily functional objects that surround us. Each plastic polymer has its proper usage and constraints. These characteristics are taken into account in my design process. Conceptually I allow myself to have freedom in exploring the object's form by respecting the material`s limitations as well as the techniques I have available to design and make my pieces. In conjunction with this creative research, I am using Computer Aided Design and Computer Aided Manufacturing through Computer Numerical Control and Rapid Prototyping technologies to design and produce the pieces.
Furthermore, my intention is to have a deep understanding of the uses, production, discard and, recycling procedures of plastics goods. I am interested in knowing more about biodegradable, compostable and recyclable polymers in order to enjoy this great material that is evolving rapidly (Lefteri, 2008) in the contemporary society without causing environmental damage and preserve good conditions to future habitants of the Planet.
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Myler, P. "Glass reinforced plastic pipe bends under a variety of loads." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254103.
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Lovering, Nina. "The Design of the Plastic Carrier Bag Policy : Success or Failure?" Thesis, Umeå universitet, Statsvetenskapliga institutionen, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-179395.
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The choice of policy design has crucial implications for a policy’s efficiency. Plastic as a material is an important issue because of its fossil origin and because it often ends up as litter and spreads microplastics. Consequently, policies regarding plastic are vital to examine to understand how we can reduce the environmental consequences of plastic. This study has examined the design of the plastic carrier bag policy and especially focused on the choice of policy instrument, the actors involved, and if the desired change in behaviour occurred. By utilising Schneider and Ingram’s policy design theory, and Howlett and Vedung’s works on policy design and policy instruments, the study built an analytical framework to examine the plastic carrier bag policy. The result showed that the design of a policy was largely dependent on who governed, reflecting the government’s political culture, aims, and goals. The outcome of the policy showed that tax as an economic instrument was efficient in changing the public’s behaviour in the use of plastic carrier bags.
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Kahl, Melissa. "Structural Design of Hollow Extruded WPC Sheet Piling." Fogler Library, University of Maine, 2006. http://www.library.umaine.edu/theses/pdf/KahlMX2006.pdf.
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Norrell, Jeffery Lee. "A mixed mode thermal/fluids model for improvements in SLS part quality, machine design, and process design /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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zhou, Weijian. "The Institute of New Feelings: Plastic Identities and Imperfect Surfaces." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4875.
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Digital media are moldable spaces where an image is simultaneously a thought. This instance and flexibility enables digital existences to be malleable, transformative, situational, and unstable. They are plastic images. Video games generate digital bodies that are a fusion of subjectivities and cybernetic simulations, in a perceivable and ambiguous process. Such bodies are extensions of ourselves, being girlish, imperfect, unfinished and happening—digesting and emitting clusters of feelings, regardless of our biological gender and age. The performative experience of play is progressively departing from spectacle, gambling and competition, and increasingly shifting towards an emotional journey of alternate realities, spreading subjectivities into the visible and invisible areas of screens. Such experience, and our plastic identities that reside within, marks a collaborative attempt between designers and audience to establish a new protocol of liquid perspectives functioning within and beyond digital space. Digital plasticity itself is a practice, as well as an inextricable process of understanding and deploying identities in the contemporary media-saturated pluralistic environment.
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McEvoy, James. "Computer aided design of preforms for injection blow moulded plastic containers." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394531.
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So, Joanna (Joanna Kelly). "Design and manufacture of plastic markers for Agile Atoms DNA Set." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/98763.
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Thesis: S.B., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (page 49).
My thesis focused on the design and manufacturing of plastic parts for the Agile Atoms DNA Set that is distributed by the MIT Edgerton Center. The design of the parts had to be easy to manufacture in-house, be easily differentiated, and be able to endure multiple use cycles. Many design aspects were discussed with the curriculum developer at the MIT Edgerton Center. The process of the mold design and machining is outlined here with suggestions for improvements for future iterations. The mold designs are completed, the molds have been machined, and production runs have commenced.
by Joanna So.
S.B.
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James, Sagil. "A Plastic Injection Molding Part Feature Extractor and Design Advisory System." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1267795491.
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Ting, Huang, and Nordqvist Daniel. "Design and manufacturing of SLM printed tooling for plastic injection molding." Thesis, Jönköping University, Tekniska Högskolan, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-54170.
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The thesis work is to show that the use of SLM (Additive Manufacturing) compared with the traditional process to make injection molds will have advantages in design, especially in waterways. This thesis work gives seven different versions of design applied to the SLM method to analyze and compare them in Solidworks® and Moldflow® to figure out what design is suitable for the SLM method. Through analysis of different versions, the finding of this thesis work is that the conformal waterway of design and lighter but stead structure in the SLM method causes the SLM molds' cooling performance to be almost 15% better than the conventional way and shorten the production time by 18% per product. Based on the advantages of the SLM method in cooling system design and structure optimization, the company can use the SLM method in the production process to improve economic and environmental benefits.
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Hounsome, Ian William. "Factors affecting the design and performance of flexible ducts in trench reinstatements." Thesis, Edinburgh Napier University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367641.
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Alameddine, Fadel 1964. "FLEXURAL STIFFNESS OF CIRCULAR REINFORCED CONCRETE COLUMNS (SLENDERNESS, ACI CODE, LOAD, DESIGN)." Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/276368.
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Lind, von Mentzer Andrea, and Micaela Lockner. "Cirkulär+plast=sant? : En studie om innovativa material till cirkulära förpackningar som alternativ till petroleum plast (från restprodukter i livsmedelsindustrin)." Thesis, Mittuniversitetet, Institutionen för design, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-38950.
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This study aims to examine the possibilities and limitations ofresidual products from the Swedish food industry for new uses inpackaging design. The selection in the study is semi strategicallyrandom and through the selection four interviews were conductedvia e-mail, two interviews from RISE and two from the Swedishdesign agencies Snask and Bedow. The interviews are based on thestudy's question issues; What innovative packaging materials withproperties corresponding to plastics are available in the Swedishmarket? And How does a selection of Swedish design agenciesapproach the innovative packaging materials available on theSwedish market? Through results and analysis we have come tothe conclusion that there is a great awareness of design agencieswhen it comes to making environmentally conscious designdecisions and that it is highly relevant in today's society. Duringthe study, interesting packaging material was discovered. What hasalso emerged is that it is a matter of course to have to be climatefriendly as everything depends on demand from customers andconsumers. There are no direct regulations to relate to, but it is upto each individual how to relate to a more sustainabledevelopment. However, in order for a societal transformation totake place, collaboration between the various social sectors isrequired (Svenska vetenskapsrådet Formas, 2018).
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Salah, Maher Jawad Younis. "Optimum plastic design of structures by generalized inverse theory and quadratic programming." Thesis, Queen Mary, University of London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337445.
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Hsu, Ze-Yi. "A system approach to plastic house design : case study, Green Bay, Taiwan." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/74962.
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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Architecture, 1985.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH.
Includes bibliographical references (leaves 125-126).
Since the building industry is getting more and more sophisticated in today's world, many new technologies lead us to many new possibilities for producing houses which we never would have thought of producing in the past. New technology for a designer implies the use of new rules. As a designer wants to use a new technology in a meaningful way, information which is useful to an engineer might not be directly useful to an architect. To say it clearly, two things are important for a designer to do before he starts a design: 1. He must understand not only the technology itself,but also the implications of it for design form. 2. He must organize the technical information in a way which he can use to evaluate the design. Thus, following this format, my reason for choosing plastic houses the object of this study is because there are many new implications and much new design information of the plastic technology for us to understand; For example, plastic house s may be transported to areas that are difficult to reach by any other means of transportation than helicopters. This may lead to a very interesting approach toward the relationship between technology and architectural design.
by Ze-Yi Hsu.
M.S.
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Haruon, Zuhair Eltigani Matar. "Design and development of an infrared heater for waste plastic gasification / by." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1181.
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Thesis submitted in fulfillment of the requirements for the degree
Master of Technology: Electrical Engineering
in the Faculty of Electrical Engineering
at the Cape Peninsula University of Technology
2013This research outlines the design, manufacturing and analysis of a far infrared ceramic heater for waste plastic gasification. The study includes the theoretical overview which concentrated on the mathematical modelling of the far infrared ceramic heater, as well as mathematical modelling of infrared gasifier. Secondly, the study presents an overview of the manufacturing process of the ceramic infrared heaters. Testing of the manufactured heaters has been performed to validate the efficacy of the heaters. The model includes non-grey radiative heat transfer between the different parts of the heaters, conduction in ceramic material, convective cooling of the surface, surface balances, and blackbody radiation theories. Using infrared module voltage as input, model predictions of temperature and wavelengths using Fourier equations were found to agree well with experimental data. The ceramic infrared heaters developed in this research are fully functional and all intended test results were obtained. The spectral analyses of different plastics (Polyethylene terephthalate, Polypropylene, Low-density polyethylene and High-density polyethylene) have been performed. ‘Heat rate’ and ‘cool rate’ of the infrared ceramic heaters have also been characterised. Gasification of plastic waste as carbonaceous material, basic reactions during gasification of plastics, and gasification products have also been discussed, including gasifier properties. The results obtained from the experiments show that using infrared heaters in gasification is practically sound because of the ability of infrared radiation to gasify waste plastics and production of syngas. This project recommended the infrared radiation because of its high efficiency in gasification of waste plastic and the production of syngas. This article reviews the infrared radiation heating and discusses the theoretical aspects of infrared radiation and the validity of infrared radiation heating in gasification of waste plastics. This research also provides a review of literature in the applications and benefits of infrared heaters.
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Hernandez, Andrea Alejandra. "PLASTIC HINGE LOCATION EFFECTS ON THE DESIGN OF WELDED FLANGE PLATE CONNECTIONS." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1863.
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Seismic design criteria have been heavily improved by the Federal Emergency Management Agency (FEMA) after the Northridge CA earthquake in 1994. Most of the damage observed was caused by brittle failure of moment frame connections. This failure was induced by the formation of the plastic hinge at undesirable locations in the beam and the column near the connection. Using welded flange plate (WFP) connections will force the formation of the plastic hinge away from the face of the column while preventing the brittle failure of the moment connection. FEMA-350 design criteria recommendations for WFP connections suggest that the plastic hinge will form away from the face of the column directly under the cover plate. The purpose of this research is to prove that the plastic hinge will form away from the face of the column, at a distance of approximately half the depth of the beam away from the cover plate. The further away the plastic hinge is from the face of the column the higher the connection demands. Therefore, underestimating the location of the plastic hinge could lead to under designed connections. The modeling and analysis of WFP connections was performed using finite element analysis software. A total of eight models with half beam half column configuration were considered in this study. Each selected section of beam and column was first designed, modeled and analyzed using WFP connections design recommendations from FEMA-350, with calculations modifications to account for the proposed plastic hinge location. Results were computed and comparisons were made in terms of plastic hinge location from the cover plates. Strength obtained for each model using finite element analysis software was also compared with hand calculations. This research also proves that increasing the thickness of the cover plates will generate an increase in the connection capacity and strength.
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Wilkinson, Timothy James. "The Plastic Behaviour of Cold-Formed Rectangular Hollow Sections." University of Sydney. Department of Civil Engineering, 2000. http://hdl.handle.net/2123/843.
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The aim of this thesis is to assess the suitability of cold-formed rectangular hollow sections (RHS) for plastic design. The project involved an extensive range of tests on cold-formed Grade C350 and Grade C450 (DuraGal) RHS beams, joints and frames. A large number of finite element analyses was also carried out on models of RHS beams. The conclusion is that cold- formed RHS can be used in plastic design, but stricter element slenderness (b/t) limits and consideration of the connections, are required. Further research, particularly into the effect of axial compression on element slenderness limits, is required before changes to current design rules can be finalised. Bending tests were performed on cold-formed RHS to examine the web and flange slenderness required to maintain the plastic moment for a large enough rotation suitable for plastic design. The major conclusions of the beam tests were: (i) Some sections which are classified as Compact or Class 1 by current steel design specifications do not maintain plastic rotations considered sufficient for plastic design. (ii) The current design philosophy, in which flange and web slenderness limits are independent, is inappropriate. An interaction formula is required, and simple formulations are proposed for RHS. Connection tests were performed on various types of knee joints in RHS, suitable for the column - rafter connection in a portal frame. The connection types investigated were welded stiffened and unstiffened rigid knee connections, bolted plate knee joints, and welded and bolted internal sleeve knee joints, for use in RHS portal frames. The ability of the connections to act as plastic hinges in a portal frame was investigated. The most important finding of the joint tests was the unexpected fracture of the cold-formed welded connections under opening moment before significant plastic rotations occurred. The use of an internal sleeve moved the plastic hinge in the connection away from the connection centre- line thus eliminating the need for the weld between the RHS, or the RHS and the stiffening plate, to carry the majority of the load. The internal sleeve connections were capable of sustaining the plastic moment for large rotations considered suitable for plastic design. Tests on pinned-base portal frames were also performed. There were three separate tests, with two different ratios of vertical to horizontal point loads, simulating gravity and horizontal wind loads. Two grades of steel were used for comparison. The aims of the tests were to examine if a plastic collapse mechanism could form in a cold-formed RHS frame, and to investigate if plastic design was suitable for such frames. In each frame, two regions of highly concentrated curvature were observed before the onset of local buckling, which indicated the formation of plastic hinges and a plastic collapse mechanism. An advanced plastic zone structural analysis which accounted for second order effects, material non-linearity and member imperfections slightly overestimated the strength of the frames. The analysis slightly underestimated the deflections, and hence the magnitude of the second order effects. A second order plastic zone analysis, which did not account for the effects of structural imperfections, provided the best estimates of the strengths of the frames, but also underestimated the deflections. While cold-formed RHS did not satisfy the material ductility requirements specified for plastic design in some current steel design standards, plastic hinges and plastic collapse mechanisms formed. This suggests that the restriction on plastic design for cold-formed RHS based on insufficient material ductility is unnecessary, provided that the connections are suitable for plastic hinge formation, if required. A large number of finite element analyses were performed to simulate the bending tests summarised above, and to examine various parameters not studied in the experimental investigation. To simulate the experimental rotation capacity of the RHS beams, a sinusoidally varying longitudinal local imperfection was prescribed. The finite element analysis determined similar trends as observed experimentally, namely that the rotation capacity depended on both the web slenderness and flange slenderness, and that for a given section aspect ratio, the relationship between web slenderness and rotation capacity was non-linear. The main finding of the finite element study was that the size of the imperfections had an unexpectedly large influence on the rotation capacity. Larger imperfections were required in the more slender sections to simulate the experimental results. There should be further investigation into the effect of varying material properties on rotation capacity.
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Wilkinson, Timothy James. "The Plastic Behaviour of Cold-Formed Rectangular Hollow Sections." Thesis, The University of Sydney, 1999. http://hdl.handle.net/2123/843.
Full textAbstract:
The aim of this thesis is to assess the suitability of cold-formed rectangular hollow sections (RHS) for plastic design. The project involved an extensive range of tests on cold-formed Grade C350 and Grade C450 (DuraGal) RHS beams, joints and frames. A large number of finite element analyses was also carried out on models of RHS beams. The conclusion is that cold- formed RHS can be used in plastic design, but stricter element slenderness (b/t) limits and consideration of the connections, are required. Further research, particularly into the effect of axial compression on element slenderness limits, is required before changes to current design rules can be finalised. Bending tests were performed on cold-formed RHS to examine the web and flange slenderness required to maintain the plastic moment for a large enough rotation suitable for plastic design. The major conclusions of the beam tests were: (i) Some sections which are classified as Compact or Class 1 by current steel design specifications do not maintain plastic rotations considered sufficient for plastic design. (ii) The current design philosophy, in which flange and web slenderness limits are independent, is inappropriate. An interaction formula is required, and simple formulations are proposed for RHS. Connection tests were performed on various types of knee joints in RHS, suitable for the column - rafter connection in a portal frame. The connection types investigated were welded stiffened and unstiffened rigid knee connections, bolted plate knee joints, and welded and bolted internal sleeve knee joints, for use in RHS portal frames. The ability of the connections to act as plastic hinges in a portal frame was investigated. The most important finding of the joint tests was the unexpected fracture of the cold-formed welded connections under opening moment before significant plastic rotations occurred. The use of an internal sleeve moved the plastic hinge in the connection away from the connection centre- line thus eliminating the need for the weld between the RHS, or the RHS and the stiffening plate, to carry the majority of the load. The internal sleeve connections were capable of sustaining the plastic moment for large rotations considered suitable for plastic design. Tests on pinned-base portal frames were also performed. There were three separate tests, with two different ratios of vertical to horizontal point loads, simulating gravity and horizontal wind loads. Two grades of steel were used for comparison. The aims of the tests were to examine if a plastic collapse mechanism could form in a cold-formed RHS frame, and to investigate if plastic design was suitable for such frames. In each frame, two regions of highly concentrated curvature were observed before the onset of local buckling, which indicated the formation of plastic hinges and a plastic collapse mechanism. An advanced plastic zone structural analysis which accounted for second order effects, material non-linearity and member imperfections slightly overestimated the strength of the frames. The analysis slightly underestimated the deflections, and hence the magnitude of the second order effects. A second order plastic zone analysis, which did not account for the effects of structural imperfections, provided the best estimates of the strengths of the frames, but also underestimated the deflections. While cold-formed RHS did not satisfy the material ductility requirements specified for plastic design in some current steel design standards, plastic hinges and plastic collapse mechanisms formed. This suggests that the restriction on plastic design for cold-formed RHS based on insufficient material ductility is unnecessary, provided that the connections are suitable for plastic hinge formation, if required. A large number of finite element analyses were performed to simulate the bending tests summarised above, and to examine various parameters not studied in the experimental investigation. To simulate the experimental rotation capacity of the RHS beams, a sinusoidally varying longitudinal local imperfection was prescribed. The finite element analysis determined similar trends as observed experimentally, namely that the rotation capacity depended on both the web slenderness and flange slenderness, and that for a given section aspect ratio, the relationship between web slenderness and rotation capacity was non-linear. The main finding of the finite element study was that the size of the imperfections had an unexpectedly large influence on the rotation capacity. Larger imperfections were required in the more slender sections to simulate the experimental results. There should be further investigation into the effect of varying material properties on rotation capacity.
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Flaherty, Annette E. "Support of GRP vessels : a comparative study for the horizontal support of laminate construction GRP storage vessels." Thesis, University of Strathclyde, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366892.
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Rashidy, M. "Design and analysis of a cost and weight efficient load bearing composite passenger car door." Thesis, Cranfield University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380624.
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Tsang, Brian Wai-Keung. "The development of a materials and processes optimisation system for plastic product design." Thesis, University of Huddersfield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323758.
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Ng, Chin Yee. "Extrusion of microcellular plastic using a tandem foaming system : design, fabrication and experimentation." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10283.
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Lin, Chin-hui, and 林錦輝. "Plastic Hook Design and Stress Analysis." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40629280629546755572.
Full textAbstract:
碩士逢甲大學
材料與製造工程所
98
According to consumers demand of plastic hook for hanging articles, the study is to simulate the stress changes of initial L type, arc type and arc type with uniform thickness of ABS plastic hooks structure while bearing weight. After optimized analysis and improvement, it makes a completed research and development process of implement CAE analysis. With the software integration, CAD (Pro / ENGINEER) and CAE (Pro / Mechanica), as well as concurrent engineering of development process, we can get the best design of plastic hook structure for 1.5kg (14.7N) loading capacity among three different types of plastic hooks (the initial L-type, arc type and arc type with uniform thickness) and two different loading areas (free edge or a cantilever beam). It provides designers a reference for implement CAE analysis.
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Lin, Geng-Hong, and 林耕弘. "Optimal Design of Plastic Ring Switch." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/32419579350605759427.
Full textAbstract:
碩士國立高雄應用科技大學
機械與精密工程研究所
101
The objective of this study is to do structural analysis of the plastic ring switch to ensure that the switch does not break during the installation. Mold Flow software combined with Taguchi method and Response surface method was used to optimal design the parameters. Four parameters, packing time, packing pressure, melt temperature, and mold temperature, were used to analyze the major factors affecting warpage and the optimal combinations of parameters. The results show that the optimal parameters are the packing time with 6s, the packing pressure with 5MPa, the melt temperature with 200℃, and the mold temperature with 25℃. The warpage (0.0685mm) of optimal design is smaller than that of original design (0.1007mm). The optimal design method can effectively improve the warpage. In actual installation of the ring switch, switch on the hook has not been destroyed. It shows that finite element analysis can predict the inadequacies of the structure effectively to improve the structure before manufacturing, and can save development time and cost.
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Hsiao, Tin-Long, and 蕭廷龍. "Design of Plastic Surface Corona Treatment." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/ju397d.
Full textAbstract:
碩士國立虎尾科技大學
電機工程研究所
96
The main purpose of this thesis is to build up a corona system for plastic printing surface treatment. In this research, a power driver is designed to generate the high-frequency and high-voltage electric power for the corona discharger. The power driver mainly consists of a half-bridge resonant inverter to generate a high-frequency ac sine-wave voltage. Then the voltage is boosted to an extreme high voltage by a high-frequency step-up transformer. Because the high-frequency transformer and the corona discharger are included in the resonant circuit, the characteristics of the transformer and discharger have to be investigated for the design of resonant inverter. By measurement and analysis, this thesis obtains the circuit models of the high frequency transformer and the corona discharger, which can provide the circuit parameters design effectively for the corona power driver. The actual output performance has confirmed the feasibility of the modeling conclusions as compared with the circuit simulated results from IsSpice’s simulation. Finally, the design criteria of a corona surface treatment system for plastic printing are established. Based on the criteria, a prototype of the corona generator designed for the 1KVA system is carried out with expected performance.
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Ching-Min, Yeh, and 葉清民. "The minimal warpage design in plastic injection molding." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/49889590955686018483.
Full textAbstract:
碩士國立高雄應用科技大學
模具工程系碩士班
94
The objective of this paper is to present a methodology for minimal warpage design of effective factor in plastic injection molding when a thin plate is produced. Many effective factors induce the warpage of the injection parts, such as sink marks, shrinkage, warpage and so on. However, the warpage of the produce is an important issue in the injection mold design. In this paper, a modified Newton-Raphson method is used to determine the injection molding conditions to reduce the warpage of the product. The design process of injection-molded includes the fluid dynamics, the heat transfer and the thermal stress problems that influenced by some design parameters. The parameters are the packing time, the packing pressure, the melt temperature, the mold temperature and the cooling time and they are determined in the injection-molded. The numerical results show that the proposed method is validity and efficiency. The results also make a comparison with the design parameters that are found by Taguchi method. The proposed method is not only more robust than that of Taguchi method but also a smaller warpage can be achieved.
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Ho, John, and 何宗陽. "Mold Design for Plastic Part Featured with Undercut." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/63280087076877610185.
Full textAbstract:
碩士大葉大學
機械工程研究所碩士在職專班
94
Today’s rapidly growing demand of plastic product in market and shortening product life cycle, not only increasing need of injection mold but also shortening development-time in its design. As to the plastic parts without undercut-feature, the construction of mold design is simple, but those with undercuts more than two, are time-consumed and complicated due to design parameters correlated each other even for an experienced designer. Main concerns in this paper are explored the optimal parting direction during mold design of plastic part with undercut in order for minimum interference among parting line , parting surface and parting direction. Design of the related mechanism for molding the undercut-featured part are proposed and illustrated by examples.
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Wang, Chuan-Lu, and 王權爐. "The Design and Manufacture of Precise Plastic Gears." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/52157276877233430082.
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Saleira, Wesley Ethiyajeevan. "New design procedure for very flexible plastic pipes." 1988. http://catalog.hathitrust.org/api/volumes/oclc/18788645.html.
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Wei, Lun-Chun, and 魏綸群. "Optimization Design for Plastic Injection Molding Process Time." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/81133515150351451668.
Full textAbstract:
碩士元智大學
機械工程學系
96
This paper demonstrates the result of using fuzzy PD controller optimization engine to the plastics injection manufactory process under product quality constraints. Because of the difficulty in expressing the product quality explicitly in terms of design variables, traditional numerical optimization algorithm is hard to be used to solve plastics injection optimization problem with product quality constraints. The fuzzy PD controller optimization engine is developed to deal with the engineering design problems with two characteristics: (1) the design variables are monotonic in the objective function and constraints; (2) the objective function and constraints are implicit functions. It is certainly to use fuzzy PD controller optimization engine as the solver to solve the plastics injection optimization problem. In this paper, 4 quality defects, short shot, sink mark, flow mark and blister, are considered as design constraints. The objective function is set as the sum of the injection time and cooling time. After 21 iterations, the objective function value is reduced from 11 sec to 1.85 sec and the quality requirements are all satisfied.
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YEH, JU-CHIN, and 葉如金. "The Design of A Plastic Surgery Clinic Website." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/65457599270140544714.
Full textAbstract:
碩士中原大學
商業設計研究所
96
It is a well known fact that plastic surgery has become a trend around the world and the operation technique is getting better so that patients are no longer afraid of suffering such pain. In addition to that, some countries promote medical tourism to attract international customers. In recent years, Taiwan has put a lot of effort towards medical tourism and medical treatment, which is as good as other countries, but we don’t have good enough marketing for medical tourism. Another of my main points is that through a website it has the power of an economic commercial media for marketing into the far-reaching world. However, Taiwan’s plastic surgery websites are not so concerned about international internet surfers with many of these websites being similar with each other and without a unique marketing selling point. Korea is one of the successful cases in plastic surgery which perfectly combines plastic surgery with other business such as tourism, translation companies. Besides that, they provide a friendly website with GUI (graphic user interface) and illustrations for helping international customers to understand. According to Korea cases, my website design focus on GUI (graphic user interface)design helping readers realize text contents and simplifying medical information with diagrams in order to bridge the language barrier. The creation research contains three steps. First of all, collect plastic surgery information, website design rules and diagram designs in order to find available elements for future creation purposes. Second, find successful website design cases such as Grand or IPS Surgery Company for example. Finally, design a plastic surgery website. Overall, my website design contributes to a GUI system for plastic surgery, simplify medical information and some illustration operational animation, also design some marketing tourism information.
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XIAO, YAO-HUI, and 蕭耀輝. "Mechanism Design of Drawing Linkage for Plastic Gloves." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/23640832080821861640.
Full textAbstract:
碩士吳鳳科技大學
光機電暨材料研究所
104
Abstract This paper focuses on the design of a new type of drawing mechanism for plastic bags during automatic manufacturing. A new type of drawing mechanism for plastic bags is designed in order to improve the drawbacks of hand-made process during tearing apart the plastic bags from the mold. According to the mechanism design theory and automatic technique, a drawing mechanism with four bar linkage is developed. The main part of the drawing mechanism is the clip which will pick up the plastic bags from the mold and draw the bags to the other side and then drop the bags to the collecting plate. The clip is fixed on the connecting rod of the four-bar linkage, and the clip path can be traced by the position analysis of the four bar linkage.
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TSENG, KENG-WEI, and 曾耿偉. "Research on Plastic Glove Machine Release Linkage Design." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7wdect.
Full textAbstract:
碩士吳鳳科技大學
光機電暨材料研究所
106
This paper focuses on the trace analysis of a new type of drawing mechanism for plastic bags during automatic manufacturing. A new type of drawing mechanism for plastic bags is designed in order to improve the drawbacks of hand-made process during tearing apart the plastic bags from the mold. According to the mechanism design theory and automatic technique, a drawing mechanism with four bar linkage is developed. In this paper, the trace of the clip, which is fixed on the connecting link of the four bar linkage, is studied with various ratios of the link lengths. According to the analysis, the trace of the clip can be adjusted by changing the ratios between link lengths to achieve working requirements.
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Wu, Chun-Hung, and 吳俊宏. "The Design of Plastic Mold forms standardization and regulations for JACK ConnectorThe Design of Plastic Mold forms standardization and regulations for JACK ConnectorThe Design of Plastic Mold forms standardization and regulations for JACK Connector." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/37562018236249843882.
Full textAbstract:
碩士國立高雄應用科技大學
模具工程系碩士班
96
ABSTERACT Connector is a general reference that usefully shown the electronic signal and the power source connection part as well as the attached fitting. The coupling is the bridge for all signals and its quality not only on the influence electric current and the signal transmission reliable degree, but also the effect upon the entire operation quality of the electronic machine. Along with improvement of industrial development, various products and a large amount of quantities are requested with high quality and exquisite appearance. Therefore, in order to improve the mold industry construction, it is important to learn experiences from overseas’ industry. Comprehensively carries out the mold standardization, the mold design, the manufacture integration, the mold specialization production, the management craft standardization, the production program, and the management is the key toward success The goal for this research is using JACK connector as the main object for standardization .In addition to establishes a set of molds standardization procedure, a designs of the main axle, a work process and the management rules. To improve the way of how current companies viewing the mold standardization, it is important to setup all the above rules and policy. Essential character: Connector (Coupling), plastic molding forms, mold design, mold standardization.
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Lin, Chun-Cheng, and 林俊成. "Plastic Snap Design of Hook Model and Structure Analysis." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/10723231600725185010.
Full textAbstract:
碩士大同大學
機械工程學系(所)
95
The research is design a complete and development procedure for plastic snap design of hook model. The research also uses CAE to conduct the optimization analysis research. Because the data of snap is not easy to find and the design type are various, therefore to collect the related information are not easy. In order to approaches the reality , this research got the related material data from Chi-Mei Corporation for simulation and experiment. The research design use traditional mechanics operation regard as max stress and experience design value calculating the plastics pieces length、width and thick design parameter size. The research uses Pro/ENGINEER soft to make first snap drawing module. After finish design the first snap module then use Pro/MECHANICA to analyze to get the optimization shape. Then according the best module to add feature improve snap shape. For example add rib、 lead round corner and remove material to analyze simulation , until each module find out optimization number value. Then we can use the analyze result to find optimization of snap shape and use the experience reference for this structure designer in the future. The analyze of this research is use more conscientious way to find the optimization shape of snap .It help the designer in initial stage developing and assess the structure good or not of products. Explore and improving the question in advance, make design construction period shorten and lower costs. In the future more experience in use CAE not only can improve designer's judgement experience and can improve industry's competitiveness.