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Erschienen in:
01.10.2023 | STRUCTURE, PHASE TRANSFORMATIONS, AND DIFFUSION
Metallographic Analysis of High-Strain-Rate Deformation and Convergence of Copper Thick-Walled Cylindrical Shells under Explosive Loading
Erschienen in: Physics of Metals and Metallography | Ausgabe 10/2023
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Abstract
The process of convergence of copper thick-walled cylindrical shells under the action of an explosion is studied using the metallographic method. The explosion was initiated at eight points evenly spaced around a circle on the surface of the explosive surrounding the shell. At the intermediate stage of convergence, eight ejections were formed on the inner surface of the shell. The convergence of the shells into a cylinder is completed due to the expansion and closure of ejections. The formation of ejections is explained by the rise of plastic (cumulative) jets at the deformation front. Jets arise when adjacent deformation protrusions collide. Regions of localized deformation were detected in and around the ejections, which is associated with the method of initiating the explosion. It has been established that high-strain-rate deformation of copper during the convergence of shells is accompanied by the formation of a large number of twins. In the outer zones of the shells, there are more twins than in the inner ones.