摘要
为研究含能单晶在173~348 K初始温度范围内的变形行为,对含能单晶黑索今和奥克托今进行不同初始温度下的准静态单轴压缩实验。用丙酮溶剂重结晶培养大单晶,使用抛光机以50 r/min的转速将其抛光至圆柱体,进行单轴压缩实验。结果表明:应力-应变曲线呈现明显的温度软化效应,晶体的断裂应力随温度升高而减小,断裂应变随温度升高而增大,晶体随温度升高呈现更好的延展性;室温下可以观察到含能单晶的断裂模式为剪切断裂,变形过程中形成模糊的微裂纹,最终导致透明的单晶破碎;奥克托今的力学行为表现出明显的各向异性。
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.
作者
胡惟佳
吴艳青
邵珠格
黄风雷
张钊
王昕捷
HU Weijia;WU Yanqing;SHAO Zhuge;HUANG Fenglei;ZHANG Zhao;WANG Xinjie(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2020年第S02期76-82,共7页
Acta Armamentarii
基金
国家自然科学基金项目(11872119、11572045)
国防基础科研挑战计划项目(2016001)。
关键词
含能单晶
准静态压缩
温度软化效应
剪切断裂
各向异性
损伤力学性能
energetic single crystal
quasi-static compression
temperature softening effect
shear fracture
anisotropy
damage mechanical behavior
