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Theses

Ductility prediction of metal sheets using the CPFEM method

Abstract : The main objective of this PhD thesis is to develop a multi-scale numerical tool capable of predicting the ductility of heterogeneous materials displaying periodic microstructure. Considering the spatial periodicity of the studied media, the periodic homogenization technique is selected to ensure the transition between the microscopic and macroscopic scales. This technique, formulated under the large deformation assumption, is coupled with the Rice bifurcation approach to predict the ductility limits of the studied media. To ensure this coupling, three numerical techniques have been implementedand compared to compute the macroscopic tangent modulus. This coupling has been used, among other applications, to predict the ductility limit of porous and polycrystalline media. The study conducted on porous media has allowed the careful analysis of the competition between void coalescence and theonset of plastic strain localization phenomenon. On the other hand, the study carried out on polycrystalline materials has highlighted the effect of several parameters on the loss of ductility of this type of materials.
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https://pastel.archives-ouvertes.fr/tel-03025996
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Submitted on : Thursday, November 26, 2020 - 3:00:26 PM
Last modification on : Friday, November 27, 2020 - 3:25:31 AM

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  • HAL Id : tel-03025996, version 1

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Jianchang Zhu. Ductility prediction of metal sheets using the CPFEM method. Other. HESAM Université, 2020. English. ⟨NNT : 2020HESAE011⟩. ⟨tel-03025996⟩

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