Convergence of Thick-Walled Cylindrical Copper Shells under Explosivie Loading

The convergence of cylindrical copper shells under explosive loading has been investigated. The shell surface was covered with an explosive layer. Explosion was initiated at eight points evenly spaced on the cylindrical surface. During the convergence, eight ejections formed on the inner surface the shells; i.e., buckling of the smooth deformation front occurred. The formation of ejections is attributed to the occurrence of plastic (cumulative) jets during the interaction of adjacent shock and deformation waves. The structural mechanism of convergence of thick-walled copper shell includes the formation, expansion, and closure of ejections. The formation of ejections was found to be preceded by another mechanism of buckling of the deformation front—corrugation.