Penetration of Shaped Charges into Frozen Ground Part Ⅱ

摘要

The effect of various parameters was studied to design a charge that would do the work of the U. S. Army M2A3 (15 lb) shaped charges with as large a saving in weight as possible. During February and March 1957, shaped charges of special design with a 4 in. diameter and weighing from 21/2 to 3f lb were fired into frozen ground at Fort Churchill, Manitoba. Data were obtained on the effect of standoff. charge weight and cone material, thickness, and angle. Results of the testing showed that a hole 5 ft deep and 1.7 in. in diameter in frozen ground can be obtained with a shaped charge weighing 2.8 lb. Aluminum cones are superior to copper or steel cones. Machined aluminum cones give greater penetration than rotary extruded aluminum cones. A 75* cone angle gave the best results. A thickness of 0.2 in. for the cone meets the minimum weight requirements. Additional studies to get greater penetration were Recommended on weight and shape of charge, fabrication of copper and steel cones, and the validity of the cube root scaling for shaped charges.