Taylor impact test of Al 2024-T351 at elevated temperature

Shear has a significant effect on the fracture strain of Al2024-T351. This effect is particularly evident with a reduced fracture strain in torsion compared with the uniaxial tensile condition. To explain this, ductile damage, and therefore the resulting fracture strain, has been proposed to depend on the stress triaxiality and the third invariant of stress deviator. In this work, the role of temperature on such dependence has been investigated. To this purpose, Taylor rod impact tests at elevated temperature (80°C and 155°C) have been performed at approximately 290 m/s, which is the velocity at which fracture development start to occur at room temperature. These tests showed that, although the overall ductility increases with temperature allowing more rod mushrooming, extended fractures occur along shear planes. Based on these results, the the Plasticity Damage Self Consistent (PDSC) model was revised and extended. Numerical simulation results are presented.