Mechanical properties of grade M1 copper before and after shock compression in a wide range of loading durations

The effect of the initial microstructure and microstructure obtained after quasi-isentropic and shock compression on the elastic-plastic and strength characteristics of grade M1 copper upon static, quasistatic, and dynamic loading has been investigated. It has been revealed that the parameters of a shock wave play an important role in the formation of the substructure and related mechanical properties of the samples and that the values of the elastic-plastic and strength characteristics in coarse-crystalline samples of copper M1 vary substantially depending on the defect structure at the identical grain size. Measurements of the elastic limit and critical fracture stresses over a wide range of the loading durations have been performed by different methods, including a VISAR laser interferometer. Based on the experimental data obtained, models of the shear and spall strength of copper for different loading conditions have been developed. With the aid of a NAG two-stage kinetic model, a numerical simulation of the dynamic fracture of coarse-crystalline samples of copper M1 with different internal structure has been performed. An analysis of the experiments in combination with the numerical simulation made it possible to describe the deformation behavior of the samples in the entire range of loading rates.