Comparison of Experimental Shock-Wave Profiles for Tungsten and Computer Simulations Using a Rate-Dependent Constitutive Model.

摘要

The Steinberg-Guinan-Lund, rate-dependent, constitutive model for Ta has been applied to W. Computer simulation successfully predicts the elastic precursor ahead of the second shock in a series of double-shock experiments. Based on the Cochran-Banner spall model, the spall strength of W is 0.9 +- 0.1 GPa, independent of loading stress from 10 to 200 GPa. The model provides an explanation of why some quasi-isentropes appear stiffer than the principal Hugoniot. 8 refs., 13 figs.