Elasto-plastic finite element analysis of thermoplastic resin with anisotropy induced by plastic deformation

Abstract

It is well known that plastic deformation of thermoplastic induces anisotropic mechanical characteristics. The present study develops a constitutive model consisted of an anisotropic elasticity and anisotropic plasticity in order to simulate the mechanical behavior in the necking part of polycarbonate, PC. The anisotropic plasticity is based on Hill’s orthogonal anisotropic plastic model with considering anisotropic hardening plasticity. The identified mechanical parameters indicate that Hill’s anisotropic plastic parameters depend on Hill’s equivalent plastic strain, i.e., anisotropic hardening plasticity. To verify the developed constitutive model, the constitutive model is implemented in an Abaqus user subroutine and analyzed using the identified mechanical parameters. It is confirmed that the analysis results are in good agreement with the stress-strain relationship obtained by uniaxial tensile tests for the necking part of PC. Therefore, the developed constitutive model can reproduce the anisotropy mechanical behavior in in the necking part of PC.