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On the formulation and finite element implementation of anisotropic multiplicative finite strain elastoplasticity

A constitutive model for orthotropic elastoplasticity at finite plastic strains is presented and aspects of its numerical implementation are addressed. The constitutive equations are related to the plastic intermediate configuration, which is introduced by F = Fe Fp. Isotropic tensor functions are used for the description of orthotropic material response in the elasticity law and the yield function. The latter is formulated in terms of the Mandel stress tensor.