Effect of the strain rate on the tensile strength of a copper shaped-charge jet

The data on the penetration depth of a rotating shaped-charge jet were used to estimate the strength of the material of a copper jet formed from a “low” conical linear with an apex angle of 120$^\circ$ under the action of centrifugal forces. The estimates 0.07–0.15 GPa obtained are close to the static yield point of deformed copper. The jet strength, which is estimated using the length of the fragments formed upon breakup of a rotation-free jet owing to the axial velocity gradient, attains 1–1.5 GPa at a strain rate of $\simeq$2 $\cdot$ 10$^4$ sec$^{-1}$.