Unusual behaviour of usual materials in shock waves

18th APS-SCCM; 24th AIRAPT

Kanel, G.I.^1

Joint Institute for High Temperatures, Russian Academy of Sciences, Izhorskaya 13, bld. 2, Moscow

125412, Russia^1

关键词: High strain rates;    Inelastic deformation;    Moderate strain rates;    Picosecond duration;    Rate dependence;    Shock compressions;    Shock-wave loading;    Ultrafine-grained metals;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/1/012001/pdf
DOI  :  10.1088/1742-6596/500/1/012001

来源: IOP

【 摘 要 】

Exotic results of investigations of inelastic deformation and fracture under shock wave loading are presented and briefly discussed. Temperature effects on the flow stress at high strain rate may differ even in sign from those we observe at low and moderate strain rates. Investigations of the temperature-rate dependence of the yield stress at shock compression demonstrate intense multiplication of dislocations. At the highest strain rates, so-called ideal (ultimate) shear and tensile strength is reached in experiments with picosecond durations of shock loading. Although grain boundaries, in general, reduce resistance to fracture as compared to single crystals, the spall strength of ultra-fine-grained metals usually slightly exceeds that of coarse-grain samples. Failure wave phenomena have been observed in shock-compressed glasses.