Abstract

A stress analysis of the target enclosure structure at the R14B firing range at Aberdeen Proving Ground (APG), MD, subjected to an internal blast and worst-case fragment impact was conducted to assure structural integrity and safe operation of the structure during tests. The reflected dynamic pressure loads due to explosive blast were estimated from the CONWEP explosion effects code developed by the U.S. Army Waterways Experiment Station and were modeled as exponentially decaying pressure pulses which could be approximated as triangular loads with equivalent impulses. Fragment impact loads are approximated from a momentum-impulse balance formulation as step loading functions. A closed-form solution of the equation of motion of a sidewall of the structure subjected to a triangular blast load was obtained and verified by a three-dimensional (3-D) finite element model.

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