Shock Initiation Characteristics of Explosives at Near-Ambient Temperatures

摘要

hn order to study the effects of near-ambient temperature changes on shock initiation behavior of explosives, the experimental devices with components of heating and cooling were designed separately for shock initiation test at various temperatures.Based on the devices, the shock initiation pressure evolution for two explosives (PBX-1: a HMX/TATB composite explosive; and PBX-2: a TATB based IHE) were measured using embedded manganin gauges over the temperature range 5 °C to 75 °C.And the ignition and growth reaction rate model was employed to simulate the shock initiation processes.The results showed that as temperature changing from 5 °C to 75 °C, the shock-initiation pressure in both of the two PBXs grew more rapidly, the run distance to detonation became shorter and the reaction rate model constant Gl increased gradually, these indicated the two explosives became more sensitive to shock as near-ambient temperature increasing.The study also suggested that the effects of near-ambient temperature changes on safety of explosives could not be neglected.