Anisotropic Failure Modeling for HY-100 Steel

Abstract

HY‐100 steel is a material that behaves isotropically in the elastic and plastic region and acts anisotropically in failure. Since HY‐100 is a ductile metal, a more gradual failure process is observed as opposed to the nearly instantaneous failure in brittle materials. We extend our elasto‐plastic‐damage constitutive model by including of a decohesion model to describe material behavior between the onset of failure and fracture. We also develop an anisotropic failure surface to account for directionality in material failure. Both the anisotropic failure and decohesion models have been implemented into a finite element code, where the effects of these models are studied in a uniaxial stress simulations, a plate impact simulations, and a quasistatic notched round bar tensile test simulations.