Application of the Shock-driven Extrusion Test to Aluminum alloy

The shock-driven extrusion test, originally developed at Lawrence Livermore National Laboratory (LLNL), is a specialized experimental configuration designed to investigate fracture behavior under shear localization at extremely high strain rates (in the range of 10^5/s¸10^6/s). In this test, a thin specimen of the material of interest, backed by a centrally perforated plate, is subjected to a shock load. As the material is driven through the perforation, it undergoes shear deformation as in a hole-punch process. In the present study, the plasticity-damage self-consistent (PDSC) model, recently extended to incorporate strain-rate and temperature dependencies, was employed to simulate shock-driven extrusion in an Al2024-T351 alloy. This alloy is particularly notable for its shear-sensitive fracture strains. Model validation was achieved by comparing numerical predictions with experimental velocity profiles, fragment size distributions, and fracture surface morphologies, confirming the model's ability to capture the shear-dominated fracture behavior under shock-loading conditions.