Hydrocode analysis of aerospace structures subjected to close-in fragmentation warheads.

摘要

Advanced vulnerability analysis methods require the accurate prediction of the synergistic effect of both the blast pressure wave and penetrating fragments from a detonating warhead on aircraft structures. In this report, a generic 1 cm radius x 2 cm length fragmenting warhead model is constructed using the hydrocode LS-DYNA. The peak overpressure, particle velocity, kinetic energy transfer, initial fragment velocity, and residual fragment velocity predicted by the model are validated using both closed form solutions, empirical, and experimental results. The ballistic performance of a 2024 aluminum panel is evaluated at a 10 cm standoff distance from the warhead. Additionally, a series of 3 graphite [0/90/+/-45]2S panels are analyzed to determine the effect of thickness on ballistic performance. Simulations demonstrated the linear effect of thickness on the damage tolerance of the composite panels within the range of panels evaluated.