S2GY_69
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It's related to 'Cavitation Phenomenon' which relates to Drag Force exerted on the penetrator, if penetrator impact velocity is bigger then some defined speed(for ogive shaped penetrators), it transfers some of it's energy to create a hole bigger then penetrator diameter which prevents target to exert force on penetrator on lateral axis therefore reduced drag force caused by missing force of Tangential stresses on penetrator.Reduced drag force on penetrator caused by cavitation, increased the depth of penetration.