The Modified Steven test geometry has been used with several different target designs to investigate the mechanical loading behavior of PBX9501 to a low velocity impact. A 2 kg. mild steel spigot projectile is launched via a new powder driven gun design, from-20 to 105 m/s, at lightly confmed, steel targets. Brief descriptions of the gun design and operation are given. The threshold velocity to reaction for various target designs, different PBX 9501 lots, and different high explosive (HE) thicknesses are reported and compared. Various diagnostics have been employed to evaluate the pressure profile and timing, and target strain behavior relative to projectile impact. The violence of reaction, as measured by both passive and active techniques, is reported relative to a steady state detonation in PBX 9501. Experimental results suggest slightly different ignition mechanisms dominate based on (HE) thickness, resulting in delayed reactions from-0.2-to 2.8ms after impact. Post-test analyses of the PBX 9501 are briefly summarized.

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