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Rozprawy doktorskie na temat „Forming simulations”

Autor: Grafiati
Data publikacji: 26 października 2024
Data aktualizacji: 31 lipca 2025

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1

Lindberg, Filip. "Sheet Metal Forming Simulations with FEM." Thesis, Umeå universitet, Institutionen för fysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-51527.

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The design of new forming tools get more problemtic as the geometries get more complicated and the materials less formable. The idea with this project is to evaluate if an implementation of a simulation software in the designing process, to simulate the forming process before actually building the tools, could help Duroc Tooling avoid expensive mistakes. To evaluate this, the commercial FEM simulation software LS-DYNA was used in a complicated project, where the design of the forming tools for forming a girder was considered. The main objective was to avoid cracking and severe wrinkling which
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Adams, Donat Jozsef. "Ab initio simulations of Earth forming minerals /." kostenfrei, 2007. http://e-collection.ethbib.ethz.ch/view/eth:30017.

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Thije, René Hermanus Willem ten. "Finite element simulations of laminated composite forming processes." Enschede : University of Twente [Host], 2007. http://doc.utwente.nl/57908.

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Bentsrud, Herman. "Friction and material modelling in Sheet Metal Forming Simulations." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19686.

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In today’s car manufacturing industry, sheet metal forming is a important process that takes preparation, which is time consuming and complex when new processes are made. When new metal grades and alloys are provided to the industry, tests are conducted to determine it’s behaviour and strengths. This gives the data for complex material models that can approximate the metal behaviour in an accurate way in a simulation environment. One of the unknown factors from tests is the friction coefficient on the sheet metal. The software Triboform is able to provide an adaptable friction coefficient model th
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Pilthammar, Johan. "Elastic Press and Die Deformations in Sheet Metal Forming Simulations." Licentiate thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15481.

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Never before has the car industry been as challenging, interesting, and demanding as it is today. New and advanced techniques are being continuously introduced, which has led to increasing competition in an almost ever-expanding car market. As the pace and complexity heightens in the car market, manufacturing processes must advance at an equal speed. An important manufacturing process within the automotive industry, and the focus of this thesis, is sheet metal forming (SMF). Sheet metal forming is used to create door panels, structural beams, and trunk lids, among other parts, by forming sheet
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6

Allesson, Sara. "Sheet Metal Forming Simulations with Elastic Dies: Emphasis on Computational Cost." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18236.

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The car industry produces many of their car parts by using sheet metal forming, where one of the most time-consuming phases is the development and manufacturing of new forming tools. As of today, when a new tool is to be evaluated in terms of usability, a forming simulation is conducted to predict possible failures before manufacturing. The assumption is then that the tools are rigid, and the only deformable part is the sheet metal itself. This is however not the case, since the tools also deform during the forming process. A previous research, which is the basis of this thesis, included a mod
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7

Kulasegaram, S. "Development of particle based meshless method with applications in metal forming simulations." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.637828.

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Finite element formulations dealing with geometric and material non-linearities have been well developed and a significant amount of work has been accomplished for the numerical simulation of metal forming processes. Nevertheless, standard finite element approaches can be sometimes ineffective in handling bulk material deformation owing to severe mesh distortion or mesh entanglement. In the past, some finite element methods such as the Arbitrary Lagrangian Eulerian (ALE) method have been introduced to allow continuous remeshing during computation. Though rather effective in handling large defo
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Gittins, D. "Hydrodynamical simulations of interstellar gas : from star-forming clouds to spiral arms." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599430.

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This thesis presents numerical investigations of interstellar gas under various conditions. Discrete, pressure-bounded gas ‘cloudlets’ are modelled with Smoothed Particle Hydrodynamics (SPH) which is shown to reproduce accurately their properties and the outcomes of collisions between them. A simple model of a molecular cloud is investigated, consisting of a spherical ensemble of such cloudlets. This model dissipates its kinetic energy on a timescale controlled by the collision timescale. Distributed star formation does not result, and hierarchical mergers of cloudlets do not play a significan
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9

Hambrecht, Jochen Dieter. "Elastic-plastic return algorithms for sheet metal forming simulations and springback analysis /." The Ohio State University, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487847761309225.

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10

Abrass, Ahmad [Verfasser]. "Simulations of Roll Forming Processes on the Basis of Steady State Properties / Ahmad Abrass." Aachen : Shaker, 2014. http://d-nb.info/1058315773/34.

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11

Mohamad, Jasri Bin. "Springback prediction in sheet metal forming : constitutive equations, finite element simulations and experimental validation." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=22712.

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Predictive methods appear to be the most effective way to solve springback in sheet metal forming. The accuracy of the predictions depends upon the application of accurate material modelling. Experimental devices and methods are being continuously improved to incorporate increasingly accurate plastic bending characteristics. As part of these efforts, a new tool has been developed to test and record the characteristics of sheet metal deformation by investigating the Bauschinger effect factors (BEF) and the identified hardening parameters. The developed tool is believed to simulate the actual fo
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12

Colville, Kevin. "An analysis of frictional effects in non-stationary contact problems for metal forming simulations." Doctoral thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33435.

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The finite element method (FEM) is widely used for the simulation of metal forming processes and has been successfully used in contact problems which arise in processes such as deep-drawing, punching, extrusion and rolling. All these processes involve friction between the contact surfaces: the sheet-metal workpiece and the toolpieces. The model of friction is thus an important part of any simulation of metal forming processes. Most FEM codes use a friction model that assumes that the contact surface is a plane. Attempts to address this problem have focused on the convective description of defo
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13

Silva, Raquel Cristina Soares de Carvalho e. "Development of numerical methodologies for parameter identification and shape optimization in metal forming simulations." Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/11202.

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Doutoramento em Engenharia Mecânica<br>Por parte da indústria de estampagem tem-se verificado um interesse crescente em simulações numéricas de processos de conformação de chapa, incluindo também métodos de engenharia inversa. Este facto ocorre principalmente porque as técnicas de tentativa-erro, muito usadas no passado, não são mais competitivas a nível económico. O uso de códigos de simulação é, atualmente, uma prática corrente em ambiente industrial, pois os resultados tipicamente obtidos através de códigos com base no Método dos Elementos Finitos (MEF) são bem aceites pelas comunida
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14

nilsson, Kevin. "Material modeling in Sheet Metal Forming Simulations : Quality comparison between comonly used material models." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18227.

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In today's automotive industries, many different simulation programs are used to optimize parts before they come into production. This has created a market for complex material models to get the best possible approximation of reality in the simulation environment. Several industries are still using older material models that can’t give an acceptable accuracy for the materials currently in use as they are based on much simpler and older materials. The problem with material models is that there is no direct comparison between the material models which leads to several sheet metal forming compani
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15

Sansalone, Mickaël. "A new shell formulation using complete 3D constitutive laws : Applications to sheet metal forming simulations." Thesis, Lyon, INSA, 2011. http://www.theses.fr/2011ISAL0015.

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Dans le domaine de la mise en forme industrielle, des outils de simulation comme le logiciel Pam-stamp 2G permettent entre autres le prototypage et l’optimisation numérique des produits, réduisant ainsi les coûts expérimentaux de mise au point. Les éléments finis de type coques en hypothèse d’état plan de contrainte demeurent les plus utilisés car ils permettent une prise en compte réaliste des déformations majeures de membrane et de flexion. Cependant, de par leur définition, la contrainte normale pouvant apparaitre en cas de compression du flan dans la direction de l’épaisseur ou encore de f
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16

Schmeja, Stefan. "Properties of turbulent star forming clusters: models versus observations." Phd thesis, [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=980518660.

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17

Tatipala, Sravan. "Sheet metal forming in the era of industry 4.0 : using data and simulations to improve understanding, predictability and performance." Licentiate thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18954.

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A major issue within automotive Sheet Metal Forming (SMF) concerns ensuring desired output product quality and consistent process performance. This is fueled by complex physical phenomena, process fluctuations and complicated parameter correlations governing the dynamics of the production processes. The aim of the thesis is to provide a deeper understanding of the challenges and opportunities in this regard within automotive SMF. The research is conducted in collaboration with a global automotive manufacturer.  The research shows that systematic investigations using process simulation models a
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18

Coslovich, Daniele. "Connections between structure,dynamics and energy landscape in simple models of glass-forming liquids." Doctoral thesis, Università degli studi di Trieste, 2008. http://hdl.handle.net/10077/2563.

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2006/2007<br>The microscopic origin of the glass-transition represents a long-standing open problem in condensed matter physics. Recent theoretical advances and the increasing amount of experimental and simulation data demonstrate the activity of this field of research. In this thesis we address, through molecular dynamics simulations of model glass-forming liquids, a key and yet unsolved issue concerning the description of the glass-transition: the connection between the unusual dynamical properties of glass-formers, their structural properties, and the features
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19

Aykol, Muratahan. "Nano-scale Phase Separation And Glass Forming Ability Of Iron-boron Based Metallic Glasses." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609825/index.pdf.

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This study is pertinent to setting a connection between glass forming ability (GFA) and topology of Fe-B based metallic glasses by combining intimate investigations on spatial atomic arrangements conducted via solid computer simulations with experimentations on high GFA bulk metallic glasses. In order to construct a theoretical framework, the nano-scale phase separation encountered in metallic glasses is investigated for amorphous Fe80B20 and Fe83B17 alloys via Monte Carlo equilibration and reverse Monte Carlo simulation. The phenomenon is identified regarding three topological aspects: 1) Pur
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20

Lindström, Stefan B. "Simulations of the Dynamics of Fibre Suspension Flows." Licentiate thesis, Mid Sweden University, Department of Natural Sciences, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-53.

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<p>A new model for simulating non-Brownian flexible fibres suspended in a Newtonian fluid has been developed. Special attention has been given to include realistic flow conditions found in the industrial papermaking process in the key features of the model; it is the intention of the author to employ the model in simulations of the forming section of the paper machine in future studies.</p><p>The model considers inert fibres of various shapes and finite stiffness, interacting with each other through normal, frictional and lubrication forces, and with the surrounding fluid medium through hydrod
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21

Xenos, Sokratis. "Porous materials : constitutive modeling and computational issues." Electronic Thesis or Diss., Institut polytechnique de Paris, 2024. http://www.theses.fr/2024IPPAX040.

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Ce travail porte sur le développement, la calibration et l'implémentation numérique d'un nouveau modèle élastoplastique entièrement explicite, isotrope et indépendant du taux de déformation pour les matériaux métalliques poreux. La microstructure est supposée être constituée d'une distribution aléatoire de vides sphéroïdaux de même forme, orientés de manière aléatoire et avec une probabilité uniforme. Le modèle proposé est basé sur des estimations d'homogénéisation antérieures qui utilisent une théorie de comparaison composite linéaire (LCC). Pour évaluer l'exactitude du modèle analytique, nou
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22

Matthes, Dirk [Verfasser], Bert de [Akademischer Betreuer] Groot, and Hansjörg [Akademischer Betreuer] Abel. "Spontaneous aggregation of fibril-forming peptides studied by Molecular Dynamics simulations / Dirk Matthes. Gutachter: Hansjörg Abel ; Bert de Groot. Betreuer: Bert de Groot." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2012. http://d-nb.info/1043025537/34.

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23

Vi, Frédéric. "Methode multigrilles parallèle pour les simulations 3D de mise en forme de matériaux." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM009/document.

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Cette thèse porte sur le développement d’une méthode multigrilles parallèle visant à réduire les temps de calculs des simulations éléments finis dans le domaine de la mise en forme de pièces forgées en 3D. Ces applications utilisent une méthode implicite, caractérisées par une formulation mixte en vitesse/pression et une gestion du contact par pénalisation. Elles impliquent de grandes déformations qui rendent nécessaires des remaillages fréquents sur les maillages tétraédriques non structurés utilisés. La méthode multigrilles développée suit une approche hybride, se basant sur une construction
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24

Uran, Matthias [Verfasser], Axel [Gutachter] Klawonn, Oliver [Gutachter] Rheinbach, and Jörg [Gutachter] Schröder. "High-Performance Computing Two-Scale Finite Element Simulations of a Contact Problem Using Computational Homogenization - Virtual Forming Limit Curves for Dual-Phase Steel / Matthias Uran ; Gutachter: Axel Klawonn, Oliver Rheinbach, Jörg Schröder." Köln : Universitäts- und Stadtbibliothek Köln, 2020. http://d-nb.info/1215837089/34.

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25

Hellborg, Simon. "Finite Element Simulation of Roll Forming." Thesis, Linköping University, Department of Management and Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8312.

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<p>A finite element model has been developed to simulate the forming of a channel section profile with the roll forming method. The model has been optimized to experimental results with respect to strains at the edge of the sheet and spring back of the sides of the profile. Finite element models with a coarse mesh have been compared to models with a finer mesh. The models with to fine mesh become instable and a model with a rather coarse mesh was finally chosen.</p><p>Both the models with shell elements and the models with solid elements have been used in the simulations. The simulations with
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Oganov, Artem Romaevich. "Computer simulation studies of minerals." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271656.

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27

Zhuang, Shoubing. "Enhancing Implicit Finite Element Sheet Forming Simulation." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1206124132.

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Wu, Wei-Tsu. "AMG : automated mesh generation for forming simulation /." The Ohio State University, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487686243822162.

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Duggal, Nitin. "Process Simulation of Roll Forming and Roll Pass Design." Connect to this title online, 1995. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1105385307.

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30

Lindgren, Michael. "Modelling and simulation of the roll forming process /." Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/040.

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31

Chen, Shuai. "Fabric forming simulation and process optimisation for composites." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/38522/.

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The development and optimisation of automated fabric preforming processes is critical for the adoption of composite materials for low cost, high volume applications. This thesis presents the development of a numerical material model to simulate the forming of 2D fabric plies into complex 3D shapes. The material model has been used to evaluate the feasibility of using matched-tool forming and double diaphragm forming, to manufacture low cost fabric preforms suitable for liquid moulding processes. The research has focused on two main aspects: (I) fabric characterisation and modelling and (II) pr
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32

Lind, Markus, and Viktor Sjöblom. "Industrial Sheet Metal Forming Simulation with Elastic Dies." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-16782.

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As part of the development process for new stamping dies, in the automotive sheet metal forming (SMF) industry, the majority of all forming operations are simulated with the Finite Element Method (FEM) before the dies are manufactured. Today, these simulations are conducted with rigid tools under the assumption that there are no tool deformations. However, research shows that tool deformations have an influence on the finished product. In real production these deformations are compensated by manual rework during the try-out. Additional reason for simulating with rigid dies is that there are no
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33

Siddiqui, Muhammad Ali. "Numerical modelling and simulation of electromagnetic forming process." Strasbourg, 2009. https://publication-theses.unistra.fr/public/theses_doctorat/2009/SIDDIQUI_Muhammad_Ali_2009.pdf.

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Le formage électromagnétique est un procédé de mise en forme des métaux à grande vitesse de déformation. Ce procédé permet de déformer des pièces métalliques en déchargeant un courant intense pulsé à travers une bobine se situant à proximité de la pièce. La modélisation numérique des procédés de mise en forme est une approche couramment utilisée pour développer et améliorer (par la réalisation d’études paramétriques) de nouveaux procédés. Le but de cette thèse est de développer un simulateur numérique afin de décrire le procédé de formage électromagnétique et de mieux comprendre les phénomènes
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34

Dogan, Ulug Cagri. "Effect Of Strain History On Simulation Of Crashworthiness Of A Vehicle." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610725/index.pdf.

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In this thesis the sheet metal forming effects such as plastic strain and thickness changes in the crash have been investigated by numerical analysis. The sheet metal forming histories of the components of the load path that absorbs the highest energy during a frontal crash have been considered. To find out the particular load path, the frontal crash analysis of Ford F250 Pickup has been performed at 56 kph into a rigid wall with finite element analysis without considering the forming history. The sheet metal forming simulations have been realized for each structural component building up the
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35

Ledentsov, Dmitry [Verfasser]. "Model adaptivity in sheet metal forming simulation / Dmitry Ledentsov." Aachen : Shaker, 2010. http://d-nb.info/1122546106/34.

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Glavas, Vedran [Verfasser]. "Micromechanical Modeling and Simulation of Forming Processes / Vedran Glavas." Karlsruhe : KIT Scientific Publishing, 2016. http://www.ksp.kit.edu.

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Wang, Tao. "Numerical simulation and optimisation for shot peen forming processes." Thesis, University of Cambridge, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620031.

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Steventon, R. H. "Aspects of numerical simulation of the metal forming process." Master's thesis, University of Cape Town, 2001. http://hdl.handle.net/11427/5467.

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Includes bibliographical references.<br>Metal forming is one of the oldest disciplines and dates back many thousands of years. The pressing of metal into shapes as a manufacturing process is widely distributed and is typically performed in engineering workshops. This process can be simulated to a degree, with a computer which provides many economic advantages.
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Lamontagne, Chantal G. Carleton University Dissertation Engineering Mechanical and Aerospace. "Numerical simulation of aluminium sheet forming incorporating plastic anisotropy." Ottawa, 1996.

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Leacock, Alan Gordon. "Numerical simulation of anisotropic plasticity in stretch formed aluminium alloys." Thesis, University of Ulster, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369949.

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41

Kleditzsch, Stefan. "Beitrag zur Modellierung und Simulation von Zylinderdrückwalzprozessen mit elementaren Methoden." Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-133117.

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Drückwalzen als inkrementelles Umformverfahren ist aufgrund seiner Verfahrenscharakteristik mit sehr hohen Rechenzeiten bei der Finite-Elemente-Methode (FEM) verbunden. Die Modelle ModIni und FloSim sind zwei analytisch-elementare Ansätze, um dieser Prämisse entgegenzuwirken. Das für ModIni entwickelte Geometriemodell wird in der vorliegenden Arbeit weiterentwickelt, so dass eine werkstoffunabhängige Berechnung der Staugeometrie ermöglicht wird und ein deutlich größeres Anwendungsspektrum der Methode bereitsteht. Die Simulationsmethode FloSim basiert auf dem oberen Schrankenverfahren und ermög
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42

Leutz, Daniel Maurice [Verfasser]. "Forming simulation of AFP material layups: Material characterization, simulation and validation / Daniel Maurice Leutz." München : Verlag Dr. Hut, 2016. http://d-nb.info/1115550438/34.

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43

Goel, Amit. "Blank optimization in sheet metal forming using finite element simulation." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/3120.

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The present study aims to determine the optimum blank shape design for the deep drawing of arbitrary shaped cups with a uniform trimming allowance at the flange i.e. cups without ears. This earing defect is caused by planar anisotropy in the sheet and the friction between the blank and punch/die. In this research, a new method for optimum blank shape design using finite element analysis has been proposed. Explicit non-linear finite element (FE) code LSDYNA is used to simulate the deep drawing process. FE models are constructed incorporating the exact physical conditions of the process such as
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44

Moshfegh, Ramin. "Aspects on finite element simulation of sheet metal forming processes /." Linköping : Department of Solid Mechanics, Department of Mechanical Engineering, Linköping University, 2006. http://www.bibl.liu.se/liupubl/disp/disp2006/tek1042s.pdf.

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45

Lindbäck, Torbjörn. "Simulation of metal forming processes including impact on product performance /." Luleå, 2003. http://epubl.luth.se/1402-1544/2003/29.

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46

Arwidson, Claes. "Numerical simulation of sheet metal forming for high strength steels." Licentiate thesis, Luleå, 2005. http://epubl.luth.se/1402-1757/2005/08.

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Lundin, Andreas. "FEM simulation of 3D forming of double curved paper structures." Thesis, KTH, Hållfasthetslära (Inst.), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-204951.

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This thesis examines the possibility of creating a functional predictive analysis tool that can be utilized to improve testing procedure for new double curved paperboard products. The most common procedure currently is to manufacture several prototype paperboards, perform initial forming tests of the new double curved shape and then iterate until a prototype paperboard successfully forms. A predictive analysis tool could greatly improve the efficiency of the prototype phase by narrowing the initial scope of desired properties. The analysis tool was to be focused on the suitability of the desir
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48

Peter, Simone. "Structure and relaxation of thin glass forming polymer films." Université Louis Pasteur (Strasbourg) (1971-2008), 2007. https://publication-theses.unistra.fr/public/theses_doctorat/2007/PETER_Simone_2007.pdf.

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Nous avons utilisé des simulations de dynamique moléculaire pour étudier des films ultra-fins de polymères, à l'aide d'un modèle coarse-grained. Nous avons analysé la dynamique au sein du film, aussi bien en moyenne que par couches en fonction de la distance à la surface. Nous avons déterminé la température de transition vitreuse Tg au cours de refroidissements. Il ressort de ces études que la dynamique est accélérée dans les couches minces par rapport à la situation du fondu en volume, et Tg diminue. Des films de polymères en solution ont également été étudiés en présence d'un solvant explici
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Reddy, Mahender Palvai. "Finite element simulation of three-dimensional casting, extrusion and forming processes." Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07282008-135311/.

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Diamantopoulou, Evangelia. "Micromorphic Continua : Advanced Multiphysic Modelling and Numerical Simulation of Metal Forming." Thesis, Troyes, 2018. http://www.theses.fr/2018TROY0004.

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L'objectif de cette thèse est de démontrer l'efficacité des modèles de comportement élastoplastique fortement couplés à l’endommagement ductile isotrope dans le cadre des milieux micromorphes afin de s’affranchir de la dépendance au maillage lors de la prévision de l’amorçage et de la propagation de la rupture ductile. Cette approche repose sur (i) l’ajout de variables cinématiques micromorphes dans le principe des puissances virtuelles conduisant à de nouvelles équations de bilan ; (ii) l’ajout de nouveaux couples de variables d’état conduisant à de nouvelles équations de comportement ; (iii)
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