Anomalous hardening under shock compression in (021)-oriented cyclotrimethylene trinitramine single crystals

作者：Ramos K J^*; Hooks D E; Sewell Thomas D; Cawkwell M J

来源：Journal of Applied Physics, 2010, 108(6): 066105.

DOI：10.1063/1.3485807

We recently proposed that the change observed in the elastic-plastic response of (111)-oriented cyclotrimethylene trinitramine (RDX) crystals under shock compression is caused by an anomalous hardening that is mediated by the homogeneous nucleation of partial dislocation loops with Burgers vector 0.16[010] on (001) {Cawkwell et al., [J. Appl. Phys. 107, 063512 (2010)]}. The orientation dependencies of the (001)[010] slip system suggested that (021)-oriented RDX crystals should also display an anomalous hardening. Molecular dynamics simulations of (021) -oriented RDX crystals confirm that this slip system is activated at a shock pressure 1.34<P <= 1.54 GPa. Plate impact experiments on (021)-oriented RDX single crystals show a two-wave elastic-plastic response at 1.0 GPa and an almost overdriven response at 2.25 GPa that is entirely consistent with the theoretical prediction.

• 出版日期2010-9-15