Assessing the ductile fracture characteristics of CuZn30 brass under various stress conditions

Abstract

This paper focuses on the investigation of ductile fracture in CuZn30 brass under various stress triaxialities and Lode angles. To achieve this, five distinct specimen geometries were fabricated, including dog-bone, notched, two types of in-plane shear, and deep drawing specimens. Every specimen was subjected to testing in three orientations: rolling, diagonal, and transverse, with the aim of investigating the potential presence of anisotropic properties in plastic deformation. A non-linear damage parameter was incorporated into the constitutive equations in two forms: coupled and uncoupled from the hardening law. It is assumed that damage progresses as the Ganjiani ductile fracture model, used as a damage initiation criterion, is established. The von-Mises yield criterion characterizes the plastic behavior of the material. In order to authenticate the experimental results, a combination of experimental and numerical simulations was carried out. In this context, all tests were simulated using ABAQUS/Standard through the implementation of USDFLD and UHARD codes. The outcomes of the simulation demonstrated good concordance with the results obtained through experiment, particularly in terms of force and the softening (necking) zone for all specimen types. It was also observed that when damage is considered as a coupled parameter to the hardening law, the softening (necking) phenomenon could be effectively simulated.