Dynamic tensile extrusion response of Al2024-T351

Al 2024-T351 is known to exhibit a significant shear effect on ductility. The dynamic tensile extrusion (DTE) test provides the possibility to probe material response under pressure and shear at large strain and high strain rates. In this work DTE tests at different velocity were performed in our single stage, light gas gun facility. The impact velocities were selected to have deformation in the die without extrusion, partial extrusion before fragment formation, and complete extrusion. Deformation and damage have been investigated analyzing with optical microscopy and EBSD analysis the microstructure evolution and fracture in the recovered projectile fragment trapped in the extrusion die. The propensity of the material to fracture along localized shear bands, which limits the overall extrusion ductility, has been observed. The results have been compared with numerical simulation performed with the plasticity-damage self-consistent (PDSC) model.