Dynamic analysis of the perforation of aluminum alloy at low velocity impact

Abstract

A finite element implementation of an anisotropic plasticity model for aluminum AA5754-O in impact simulations was performed, particularly for the case of perforation on low velocity (up to about 25 m/s). The elasto-viscoplastic model includes isotropic elasticity, anisotropic yielding, associated plastic flow and mixed non-linear isotropic/kinematic hardening. Coupling between elasto-viscoplastic model and isotropic ductile damage is investigated. Strain rate is integrated in numerical modeling. The material model is implemented into a user-defined material (VUMAT) subroutine for the commercial finite element code ABAQUS/Explicit to predict the numerical response of circular aluminum plate subjected to low velocity impact. Results include the effect of anisotropy on the material behavior. It is shown that anisotropy plays a significant role in penetration of the present plate material.