Effect of Microcracks in the Annular Groove Region of a Tungsten Alloy Kinetic Energy Penetrator

Report No. ARL-RP-85
Authors: Todd W. Bjerke and Brett R. Sorensen
Date/Pages: September 2004; 14 pages
Abstract: The influence of microcracks in the annular groove region of a kinetic energy penetrator is examined through a combined theoretical, experimental, and computational study. Microcracks resulting from plastic deformation are quantified for a typical penetrator made from tungsten alloy (WA). The effect of existing and proposed annular groove geometries on the stress field near the penetrator surface is determined using finite element techniques, and the effect of the various stress fields on the critical flaw size is examined. Recommendations of microcrack size and groove geometry are made to improve the fracture resistance of conventional WA long rod penetrators.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2004