Caractérisation expérimentale et modélisation de la déformation plastique des tôles métalliques

Abstract : The precise determination of the plastic behaviour of anisotropic sheet metals is a key element for obtaining reliable results in numerical simulations of forming processes. In this study, an identification procedure has been developed using an 8- parameter yield surface model. The procedure is based on the analysis of both classical uniaxial tension tests performed along different directions, and heterogeneous biaxial tensile tests. Two types of cruciform specimens have been designed to this end. Under biaxial stretching, the specimens are submitted to strain fields covering the range from uniaxial tension to equibiaxial tension. First, the analysis of uniaxial tensile tests allows us to determine strain-hardening parameters, and yield function parameters related to strain- and stress-anisotropy. Then, the other yield function parameters defining the shape of the yield surface in the biaxial stretching range are obtained using an identification procedure which minimizes the difference between strain fields obtained experimentally by an image correlation method, and strain fields determined by numerical simulations using a finite element code. The identification procedure has been applied to 2 steels of deep-drawing quality, an AISI304 stainless steel and two aluminium alloys. The results display the high sensitivity of the proposed identification method. Validation tests are also presented
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Mihaela Teaca. Caractérisation expérimentale et modélisation de la déformation plastique des tôles métalliques. Autre. Université Paul Verlaine - Metz, 2009. Français. ⟨NNT : 2009METZ028S⟩. ⟨tel-01752654⟩

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