Penetration with Long Rods: A Theoretical Framework and Comparison with Instrumented Impacts
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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A critical review of the eroding rod model for deep penetration by long rods is presented. The chief difficulty lies in the use of the modified Bernoulli equation and of the over-simplified rigid-plastic material model, which is implied by that equation. It is concluded that even though the eroding rod model can give only limited insight into the details of the actual rod target interaction, still it is useful in suggesting an experimental program to begin probing the details of the interaction process. The theoretical framework underlying such a program is explained in detail. The theory of one dimensional wave propagation is used to show how data from instrumented long rods and targets may be fitted together to give a coherent picture of the time sequence of events during penetration. Data from one series of experiments, reported in detail elsewhere, is presented and discussed within the theoretical framework.
- Numerical Mathematics