Evaluation of AW-6082 Aluminium Bar Shearing Simulation

Abstract

Bar shearing is an important operation that supplies semi-finished billets to many metalworking processes such as stamping, extrusion and precision forging. Temperature rise and stress state variation during shearing have a great influence on material behavior and rupture mechanics. Consequently, accurate simulation of shearing requires a precise material modeling. The studied material is the AW-6082 aluminium alloy. This paper concerns principally the improving of shearing simulation by means of adequate modeling of ductile failure. The major contribution of this study is to present a relatively uncomplicated method to calibrate a decoupled damage model. To this purpose, the Hooputra ductile damage (HDD) model is selected since it reflects the influence of different stress states and temperature variations on the mechanical failure of the material. The triaxiality is considered as indicator of the stress state. The identification of the parameters of the damage model is based on a hybrid experimental-numerical analysis of three characterization tests, namely tension tests on smooth bars, tension tests on notched bars and shear tests. The obtained calibrated damage model is employed to simulate shearing. The fracture is simulated using the “element deletion” technique. Computed shearing results are eventually evaluated by comparing simulated force-displacement curve to experimental one.