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Effects of temperature and strain on the resistance to high-rate deformation of copper in shock waves

Authors :
S. V. Razorenov
Andrey Savinykh
G. I. Kanel
Gennady Garkushin
Source :
Journal of Applied Physics. 128:115901
Publication Year :
2020
Publisher :
AIP Publishing, 2020.

Abstract

Elastic–plastic shock compression, unloading, and the stepwise shock compression of copper were investigated at room temperature, 710 °C, and 850 °C to expand the measurement range of high-rate deformations. The dependences of the dynamic yield stress on the temperature and pressure of shock compression were determined from an analysis of the free-surface velocity histories. Although the initial resistance to high-rate deformation increases anomalously with increasing temperature, even a small strain in the shock wave can change the sign of the temperature dependence of the flow stress. Using these data, the dependence of the plastic strain rate on the shear stress in shock waves and temperature was obtained in the range 105–107 s−1. It was found that at room temperature, the ratio between the shear stress and the plastic shear strain rate in a shock wave practically does not depend on the loading history, whereas at 850 °C, the parameters of the plastic flow in the second shock wave deviates significantly from the initial dependence for lower stresses and higher strain rates.

Details

ISSN :
10897550 and 00218979
Volume :
128
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........0f992fd30745d35b343e09963ff490cf
Full Text :
https://doi.org/10.1063/5.0021212