Abstract
The velocity at which the mode of penetration of a rod striking a thick target changes from gross plastic deformation to a jetting type of flow has been called the hydrodynamic transition velocity. It is proposed that this velocity depends on the relative rates of rod erosion and plastic wave propagation. A simple theory predicts the hydrodynamic transition velocity for right cylindrical rods striking normally a thick target in terms of the empirical dynamic strength of the rod and target and the dynamic work hardening rate or dynamic large strain tangent modulus of the rod material.
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