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Theses

Identification des lois de comportemement élastoplastiques par essais inhomogènes et simulations numériques

Abstract : The subject of the thesis deals with the anisotropy elastoplastic constitutive behavior law identification in the aim of its use for the numerical simulation of the metal sheet deep drawing processes. Essentially, we have contributed to the definition and the application of constitutive behavior identification techniques and strategies from experimental tests. The classical tests used for the identification: Simple tensile test, in the axes and off-axes, plane tensile test and the bulge test are presented and analyzed from the point of view of the deformation homogeneity to outcome to the stress-strain relation grom the globales measurements force-displacement. The identification of the behaviorlaws from homogeneous tests needs numerical simulation coupled with an optimisation procedure (simplex method) for minimizing the difference between measured results and model responses calculated by finite element method. We have identified anisotropy elastoplastic behaviour laws with isotropy hardening law. These laws are based on the choice of the constitutive functions" equivalent stress" which defines the yield locus and plasticity potential( non associated plasticity) that has the same form as the yield function. Several quadratic and non quadratic yield loci are then used. We have developed a specific sensitivity analysis method of the tests in relation to the identified behaviour law parameters. This method is applied on practical examples.
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Contributor : Ali Khalfallah <>
Submitted on : Thursday, April 1, 2010 - 1:41:51 AM
Last modification on : Thursday, October 22, 2020 - 2:14:17 PM
Long-term archiving on: : Wednesday, September 8, 2010 - 8:46:16 PM

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  • HAL Id : tel-00468903, version 1

Citation

Ali Khalfallah. Identification des lois de comportemement élastoplastiques par essais inhomogènes et simulations numériques. Mécanique [physics.med-ph]. Faculté des Sciences de Tunis, 2004. Français. ⟨tel-00468903⟩

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