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Apport des méthodes de remaillage pour la simulation de champs localisés. Validation en usinage par corrélation d’images.

Abstract : In this work, a fully automated adaptive remeshing strategy, based on a tetrahedral element to simulate various 3D metal forming processes, was proposed. The aim of this work is to solve problems associated with the severe mesh distortion that occurs during the computation and which may be incompatible with the evolution of the physical behavior of the FE solution. Indeed, the quality of the mesh conditions affects the accuracy of the calculations. The proposed strategy is integrated in a computational platform which integrates a finite element solver (Abaqus/Explicit), 3D mesh generation and a field transfer algorithm.The base idea is to use the h-adaptive methodology in the combination with a damage-criterion error and Zienkiewicz-Zhu Z2 type error estimator (SPR-improved) to locally control the mesh modification-as-needed. Once a new mesh is generated, all history-dependent variables need to be carefully transferred between subsequent meshes. Therefore, different transfer techniques are described and compared. An important part of this work concerns the presentation of the proposed modification of the field transfer operator and a special attention is given to restore the local mechanical equilibrium of the system. During the large elasto-plastic deformation simulation with damage, the necessary steps for remeshing the mechanical structure are presented. The several types of applications are also given. For all studied applications, the above strategy can improve the accuracy and quality of numerical results. It also has benefits to decide how refined a mesh needs to be to reach a particular level of accuracy, or how coarse the mesh can be without unacceptably impacting solution accuracy.For the machining processes, kinematic field measurements using Digital image Correlation were performed to validate the numerical simulation at the local level. The comparison of the experimental kinematic fields and those resulting from the FE calculation highlights the robustness of the proposed mesh adaptation process which can transcribe the experimental local phenomena. Also, the reproduction of the material flow at the edges and the chip are correlated with the experimental results accurately. Finally, the physical study of the numerical results can be allowed to propose an innovative description of ASB formation.
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Submitted on : Thursday, July 25, 2019 - 9:41:09 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM


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  • HAL Id : tel-02193989, version 1


Bessam Zeramdini. Apport des méthodes de remaillage pour la simulation de champs localisés. Validation en usinage par corrélation d’images.. Génie des procédés. Ecole nationale supérieure d'arts et métiers - ENSAM, 2018. Français. ⟨NNT : 2018ENAM0051⟩. ⟨tel-02193989⟩



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