Effect of pore in composition-B explosive on sensitivity under impact of drop weight

Experiment impacting explosive sample with a drop weight is a standard approach in China. Pores in explosive have a significant effect on its sensitivity under impact of a drop weight. In the experiments impacting explosive samples with a drop weight, it is difficult to observe the dynamic responding and igniting process around a pore by using a measurement approach. This work developed an approach to predict the effect of pore in explosive on sensitivity under impact with drop weight. The effect of pore in composition-B explosive on the sensitivity under impact with a drop weight was investigated by using numeral simulation in this work. Through a series of numerical calculation, it was found that when the sizes of pore in composition-B explosive are less than 0.3 mm, its effect on sensitivity under impact of a drop weight can be ignored. This result agrees with the experimental data.