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An Investigation of Armor Bolt Failure Due to Ballistic Events

SIDNEY CHOCRON, ALEXANDER J. CARPENTER, SHAWN C. KLANN

Abstract


The US Army is interested in better predicting failure under impact of the bolts that attach armors to vehicles or the main armor. To understand the forces and failure process, the Army started systematic experimental studies where bolt torque, number of plates, plate materials, etc. were varied to measure the force the bolts had to support for different configurations. A computer simulation effort was initiated and presented in the last International Symposium on Ballistics to determine the Johnson-Cook (JC) constants of the bolt material. The objective of the present work is to validate the constants obtained there by comparing the forces measured in the laboratory tests by Klann with the ones computed using LS-DYNA and EPIC. This paper describes the computer models for the armors of interest as well as some details on boundary conditions, material models, and validation studies. It also presents parametric studies. When possible, the computations are compared to test results.


DOI
10.12783/ballistics2019/33208

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