Abstract
A theory of the indentation of a thick plate from impact by a flat‐ended elastic cylinder is derived from elastic and plastic theories and compared to experimental values for 2024‐T4 aluminum alloy, half‐hard‐naval brass and Armco iron. Plastic conditions in plates of the aluminum alloy are considered in detail by assuming an exponential increase in hardness to a maximum value. These results are sensitive to projectile length and are compared to experimental results for five projectile lengths.

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