The initiation sensitivities of TNT and comp. B explosives to linear shaped charge (LSC) jets were measured by using a simple test apparatus and up and down method. Five kinds of LSC were used which have same shape, explosive cores, liners and envelope materials but different geometrical sizes. The tested explosives were covered with A3 steel plates through which the jets arrived at explosives, and the thickness of steel plates were changed in each of tests. The standoff distance of LSC was equal to the liner width. The 50% jet initiation sensitivities of tested explosives were obtained and were represented with thickness of the cover steel plates. At the same time the penetration depths of LSC jets to a thick A3 steel plate were also measured and were used to represent the jet energy. Then, the residual energy, which the jets still possessed after they had passed through the steel plates and could not detonate the tested explosives in 99% probability, were obtained by a series of calculation. Based on the tests three kinds of LSC cutters, which could cut off bombs without causing explosion, were devised to destroy unexploded or obsolete bombs. The experiments of cutting bombs were conducted with satisfying results. The results are discussed and some photographs are provided here.
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