Response of the Wayne State Thorax Model With Fabric Vest to a 9-mm Bullet
Final rept. 1 Oct 2000-30 Sep 2001
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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The 1999 version of the Wayne State Thorax Model, WSTM99, was applied to the finite element FE simulation of a 9-mm Remington bullet striking a multi-ply Keviar DuPont vest worn by a human thorax. The bullet impact speed was 425.5 ms, and the hit location was the vest material covering the center of the sternum. FE models for the vest and bullet were developed. The computations were performed with the LS-DYNA FE code. Computational results for axial along the path of the bullet acceleration were compared with accelerometer measurements from three tests performed at the Armed Forces Institute of Pathology on human thoracic tissue. At the posterior sternum, the computed peak axial acceleration was 5.6 times larger than the measured value in the direction of the bullets lateral path and 11 smaller than the measured value in the opposite recoil direction. At the ligamentum arteriosum, the computed peak axial acceleration exceeded the measured value by factors of 7.9 and 18.1 in the directions along and opposite to the bullets initial path, respectively. Possible explanations for the discrepancies are offered in terms of features of WSTM99 and of the gauges used in the tests.
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