Work

Shock induced damage and fracture in single crystal rhenium at different crystal orientations

Year: 2025

Type: article

Abstract: Rhenium (Re) is usually used in extreme operating conditions such as high speed impact due to its superior mechanical and physical properties. Spallation is a typical dynamic tensile rupture phenomenon. However, the shock reaction mechanism and law of Re have not been fully established. In this research, large-scale molecular dynamics simulation was applied to investigate the shock-induced damage and fracture of single-crystal Re in different crystal orientations under loading speeds ranging from 0.5 to 3.0 km/s. Our study reveals that the response is highly anisotropic under different load orientations. It has been discovered that the material heats up during wave propagation at a higher loading velocity, decreasing the spall strength. Additionally, [2-1-10] has the lowest spall threshold strength and [0001] has the best resistance to spall. The process of nucleation, growth, and coalescence of the voids can be observed by focusing on the examination of the shock-induced response of the [0001] crystal orientation. We also found that a large spall region results from higher shock intensity and temperature, which also cause a change in fracture morphology from classical spallation to micro-spallation with less anisotropy caused by atomic arrangement. The findings of this study add to a better knowledge of the mechanism and attributes of shock-induced damage on single-crystal Re under ultrahigh strain rate loading.

Source: Journal of Applied Physics

DOI: 10.1063/5.0269363