The thermomechanical behavior of porous RDX single crystals is studied under dynamic loading using an anisotropic dislocation-based crystal plasticity model that accounts for deformation-induced heating. A micromechanics-based framework is proposed to account for micro-inertially confined dynamic collapse of pores. A suite of finite element calculations are carried out to systematically elucidate the role of crystallographic orientation on hot-spot formation. Under particular loading orientations, the porous RDX crystals are found to be quite sensitive to deviatoric and volumetric strain localizations, even for loading situations that do not particularly promote strain localization in isotropic materials. Due to the anisotropy-induced strain localizations, fairly severe hot-spots are predicted even under moderate applied strains. The susceptibility of porous RDX to strain localize and form severe hot-spots under particular loading orientations has important implications for accidental detonation of these energetic materials.

使用基于各向异性位错的晶体可塑性模型研究了在动态载荷下多孔RDX单晶的热力学行为，该模型考虑了形变诱导的加热。提出了一种基于微力学的框架，以解决微惯性约束的孔隙动态塌陷问题。进行了一系列有限元计算，以系统地阐明晶体取向对热点形成的作用。在特定的加载方向下，发现多孔RDX晶体对偏向应变和体积应变局部化非常敏感，即使在加载情况下并没有特别促进各向同性材料中的应变局部化也是如此。由于各向异性引起的应变局部化，即使在中等应变下也可预测到相当严重的热点。