Convergence of Thick-Walled Cylindrical Copper Shells under Explosive Loading
V. I. Zeldovich1, I.dag A. E. Kheifets1, I. V. Khomskaya1, D. N. Abdullina1, S. V. Balushkin2, A. Yu. Simonov2, G. V. Kulikov2
1Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
2RFNC, Zababakhin All-Russian Research Institute of Technical Physics, Snezhinsk, Russia
Keywords: convergence of copper shells, shock-wave loading, high-speed deformation, instability of deformation front
Abstract
The convergence of cylindrical copper shells subjected to explosion has been investigated. The shell surface was covered with an explosive layer. Explosion was initiated at eight points evenly spaced on a cylindrical surface. During the convergence, eight ejections were 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 consists of the formation, expansion, and closure of ejections. It has been found that the formation of ejections is preceded by another buckling mechanism of the deformation front-corrugation.
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