含能单晶不同初始温度和准静态压缩下的损伤力学性能

Uniaxial compression tests for energetic single crystals (RDX and HMX) were conducted to investigate their deformation behaviors at initial temperatures of 173-348 K. Large energetic single crystals were grown and recrystallized using acetone-solvent slow evaporation method, and then were polished to cylinders using a polishing machine at 50 r/min. The stress-strain curves show obvious temperature softening effects. With the increase in temperature, the fracture stress of the crystal decreases and the energetic single crystals exhibit better ductility. Shear fracture modes of RDX and HMX single crystals can be observed at room temperature, in which the smeared micro-cracks are formed, resulting in transparent single crystal being crushed into pieces. Moreover, the mechanical behavior of HMX shows obvious anisotropy.