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Penetration with Long Rods: A Theoretical Framework and Comparison with Instrumented Impacts,
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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The eroding rod model for deep penetration 1,2 is attractive because of its simplicity and its ability to make qualitative predictions that appear to be useful for parametric studies. Nevertheless, it contains several obvious flaws. Chief among these is the use of the modified Bernoulli equation and of the oversimplified rigidperfectly plastic material model, which is implied by that equation. A critical review of the model as it presently exists is presented in the next section. In spite of its shortcomings the eroding rod model appears to be a good starting place for an experimental investigation of penetration, which in turn should lead to a more complete model. In the third section of this paper the theoretical framework for an experimental program is described. 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 for one impact condition is then compared within the theoretical framework. In the final section the results to date are discussed. Author
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