Identification of fully coupled anisotropic plasticity and damage constitutive equations using a hybrid experimental–numerical methodology with various triaxialities

A hybrid experimental–numerical methodology is presented for the parameter identification of a mixed nonlinear hardening anisotropic plasticity model fully coupled with isotropic ductile damage accounting for microcracks closure effects. In this study, three test materials are chosen: DP1000, CP1200, and AL7020. The experiments involve the tensile tests with smooth and notched specimens and two types of shear tests. The tensile tests with smooth specimens are conducted in different directions with respect to the rolling direction. This helps to determine the plastic anisotropy parameters of the material when the ductile damage is still negligible. Also, in-plane torsion tests with a single loading cycle are used to determine separately the isotropic and kinematic hardening parameters. Finally, tensile tests with otched specimens and Shouler and Allwood shear tests are used for the damage parameters identification validation tests.

Subjects

Elastoplasticity

mixed hardening

ductile damage

microcracks closure

mechanical testing

inverse approach

Finite element method

DDC Class

620: Ingenieurwissenschaften

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http://rightsstatements.org/vocab/InC/1.0/

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1056789514546578-1.pdf

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2.25 MB

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Identification of fully coupled anisotropic plasticity and damage constitutive equations using a hybrid experimental–numerical methodology with various triaxialities