Effect of the pressure of shock compression on the critical shear stresses in metals

The critical shear stresses σ* behind the leading edges of shock waves were studied in aluminum at pressures of 300 and 650 kbar, copper at 240 and 550 kbar, and lead at 460 kbar by carrying out explosion experiments. The quantity in question was estimated by comparing the experimental data characterizing the fall in pressure at the leading edge of the shock wave (arising from load relaxation) with the results of calculations.