An analytical model for the cratering process in a metal target due to high-velocity penetration of a jacketed rod has been developed. The jacketed rod consists of a central high-density core surrounded by a low-density jacket. The analysis is based on the observation that two mechanisms are involved in the cavity growth by eroding rods: flow of rod erosion products, which exerts radial stress on the target and opens a cavity, and radial momentum of the target as it flows around the rod front nose.
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