Effects of initial temperature on spalling of metals

Abstract
In this work some experimental results are presented and a modeling on the effect of initial temperature on spalling is reported. The finite element modeling of the effect of temperature has been performed by simulating the planar impact experiment at different initial temperatures. The plastic behavior of the armor steel was modeled by Zerilli-Armstrong constitutive relation and a rate dependent power-law plasticity model for the aluminum alloy. The visco-plasticity models have been implemented along with the modified cumulative criterion into a finite element code. The thermo-mechanical coupling has been considered by implementing the heat conduction equation. Results from this modeling are compared with available experimental results. The calculated free surface velocity profile is compared with the experimental one. Maps of spall zone calculated numerically for different initial temperatures are also presented. The scheme developed presents an important tool in design of the planar experiments in a wide range of temperature.