Abstract
A method for applying the James initiation criterion for explosives with thick cover plates is established. Impact data and corresponding shock induced detonation thresholds were collected and evaluated for flat steel projectiles of different diameters impacting PBX-9501 explosive charges covered by steel plates of various thicknesses. The analysis of the data demonstrated an improved prediction of the detonation thresholds of the explosive charges using the James criterion with a proper accounting of material strength effects, particularly for explosives with relatively thick cover plates. The approach is limited to impacts that produce a one-dimensional flow in the explosive.
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