On the numerical simulation of DTE test of OFHC Copper: Influence of constitutive modeling and numerical parameters

The dynamic tensile extrusion (DTE) allows to investigate the material behavior under extreme conditions, very large plastic deformations, and high temperatures and strain rates. It is therefore an essential tool for constitutive modeling validation. At the same time, the numerical simulation of the DTE test is particularly challenging since several aspects need to be evaluated before model verification. In this work, the influence of material modelling and of numerical parameters for the simulation of the DTE test on OFHC Copper was investigated and the results were compared to experimental data. The performances of three different constitutive models, phenomenological (Modified Johnson and Cook, MJC), physically based (Mechanical Threshold Stress, MTS) and hybrid (Zerilli-Armstrong, ZA) were evaluated. For each model, the material parameters were identified using uniaxial stress-strain data at different temperatures and strain rates. Independently from constitutive modeling, a sensitivity analysis was carried out in order to evaluate the role of computational parameters as well.