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Role of Temperature and Preexisting Dislocation Network on the Shock Compression of Copper Crystals by I.A. Bryukhanov is a Engineering article available to read on EtoBox.

What is Role of Temperature and Preexisting Dislocation Network on the Shock Compression of Copper Crystals about?

Shock wave experiments show that many annealed face-centered cubic metals exhibit an anomalously increasing yield strength with temperature at high strain rates. Such an increase is usually associated with the multiplication of dislocations in the phonon friction mode, which slows with temperature. However, the effect of temperature on the structure of the shock wave and the yield strength of metal crystals, including those with microstructure, remains elusive. In this paper, we perform molecular dynamic simulations of shock-wave loading for [110] and [111] copper crystals of 0.45 and 0 . 80 μm length in a wide range of temperatures between 100 and 1100 K to understand the role of temperature and preexisting dislocations on the Hugoniot Elastic Limit (HEL). We show that, in ideal copper crystals, the elastic precursor exhibits a form of plateau, and the HEL almost does not change with shock propagation distance. However, at higher impacts, the perturbations of an elastic precursor are observed leading to fluctuations in the HEL value. We show that temperature dependencies of the HEL are strongly anisotropic. The HEL values tend to decrease with temperature for [110] perfect copper

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Author

I.A. Bryukhanov

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)