Depth and Motion Prediction for Earth Penetrators

Abstract
Empirical equations of motion have been developed for projectile penetration in soil and rock. The soil penetration analysis uses Young's S- number as the penetrability index. The rock penetration analysis calculates resistance-to-penetration using density, strength, and Rock Quality Designation. Closed-form equations are obtained for final penetration depth in single-layer targets of soil or rock. Numerical solutions are obtained for multiple-layer targets. For targets with accurately known properties, the final-depth results are accurate within + or - 20 percent. (Author)

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