ABAQUS/Explicit implementation of a constitutive model for thin sheet metals subjected to forming procedures. Part I: theory
Keywords:sheet metals, orthotropic plasticity, constitutive modelling, finite element analysis
This paper deals with the Abaqus/Explicit implementation of a constitutive model for orthotropic thin sheet metals subjected to forming procedures dominated by stretching and bending effects. The metallic sheet is assumed to behave as an elastoplastic shell body, its mechanical response being described by Hooke’s law combined with a plastic potential and the associated flow rule. The constitutive model is kept in a general form so that it can easily accommodate different expressions of the plastic potential. Such a particularization involving the BBC2005 effective stress combined with two analytically defined hardening laws has been implemented by the authors as a VUMAT subroutine of the Abaqus/Explicit finite element programme. The predictive capabilities of the constitutive model will be analysed in the second part of the paper.
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