AN ANALYSIS OF THE SHOCK INITIATION OF GRANULAR EXPLOSIVES BY THE GAS COMPRESSION -CONDUCTION MECHANISM,
STANFORD RESEARCH INST MENLO PARK CALIF
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The role of the gas compression-conduction mechanism in shock initiation of granular materials was studied by analyzing the dependence of grain surface temperature on the magnitude of the shock and the relative sizes of grain and surrounding volume of interstitial gas. It is shown that at one atmosphere initial ambient pressure the mechanism can be a contributing factor to initiation if particle size distribution or particle irregularity leads to the existence of small particles surrounded by large, gas-filled spaces the required sizes are possible for real materials. At low pressures approximately 10 microns Hg on the other hand, it is unlikely that the mechanism is a contributing factor. Since in practice these granular masses can be shock-initiated independent of initial ambient pressure, the conclusion is that at least one primary initiation mechanism other than gas compression-conduction plays a role.