Fracture of Grooved Kinetic Energy Rods Subject to Oblique Impact

Report No. ARL-TR-3923
Authors: Robert L. Anderson
Date/Pages: September 2006; 26 pages
Abstract: Kinetic energy penetrators often possess buttress grooves that are used to aid in the launching process. The shock physics code CTH has been used to analyze the effect that these grooves have on tungsten heavy alloy rods during oblique impacts that create asymmetric loading conditions. To examine this behavior, simulations were run in which grooved rods underwent 60? oblique impacts with finite thickness rolled homogeneous armor steel plates at 1300 m/s. Previous experimental work done by Raftenberg and Bjerke has shown that buttress grooves make the rods more susceptible to fracture, and it has been shown that CTH can predict the occurrence of fracture due to stress concentrations in bending loading when the simulation is run using reverse ballistics. The use of reverse ballistics has been shown to decrease the loss of groove definition.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2006