Dynamic quasi-isentropic loading of tungsten

Abstract

Experiments have been performed on smooth bore guns to obtain quasi-isentropic compression in tungsten to stresses approaching 250 GPa. Quasi-isentrophic loading was introduced in the material either by using graded density or layered impactors. Results of these experiments indicate that the quasi-isentrope lies above the Hugoniot up to ∼140 GPa, contrary to initial expectations. These results suggest that the dynamic yield strength of the material is higher for the relatively slower rates of isentropic loading.