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Advanced modelling for sheet metal forming under high temperature

Abstract : The aim of this thesis is to propose two complementary approaches for modeling and numerical simulations of thin sheet metal forming processes. The first one is a deliberately simplified multi-step inverse approach to simulate and "optimize" rapidly and inexpensively thin-sheet stamping processes while maintaining good accuracy in the stress calculation. An implicit static solver is developed by introducing several efficiently constructed intermediate configurations using a quadratic programming technique with projection. The second approach, which is of an incremental nature, is based on (i) a formulation of equilibrium equations and strongly coupled multiphysical behavior equations formulated in the context of micromorphic continua; (ii) spatial discretization by FEM and time discretization by FD with an explicit dynamic global solver and implicit iterative local integration scheme. Particular attention is paid to the nonlocal thermal aspects with the introduction of a micro-temperature and its first gradients leading to two strongly coupled thermal equations generalizing several thermal nonlocal models proposed in the literature. The multi-step inverse approach was implemented in the KMAS in house code while the nonlocal incremental approach was implemented in ABAQUS/Explicit. Parametric studies are performed and validations are carried out on simple examples and on deep drawing processes
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Submitted on : Monday, December 16, 2019 - 3:44:11 PM
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Weijie_Liu_2017TROY0019.pdf
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  • HAL Id : tel-02414328, version 1

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Weijie Liu. Advanced modelling for sheet metal forming under high temperature. Mechanics of materials [physics.class-ph]. Université de Technologie de Troyes; Dalian University of Technology (Chine), 2017. English. ⟨NNT : 2017TROY0019⟩. ⟨tel-02414328⟩

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