高能材料动态力学性能的研究

采用自制的高能材料动静态变温三轴、单轴压缩试验装置、在熔点以下温度，以及在中等应变速率（２～４／ｓ）和准静态（３１０￣（－３）／ｓ）条件下测试了ＴＮＴ材料三轴、单轴压缩力学性能参数。试验结果表明，ＴＮＴ材料具有明显的应变率相关和热软化效应。在单轴压缩条件下，ＴＮＴ材料是脆性破坏，断裂强度小于屈服极限；在三轴压缩条件下，试件有较大的塑性变形。根据试验结果拟合了ＴＮＴ材料随着加载速率和环境温度变化的本构关系，分析表明该本构关系可以很好地描述材料的应变率、温度效应。

AN EXPERIMENTAL STUDY ON DYNAMIC MECHANICAL PROPERTIES OF ENERGETIC MATERIALS

In this paper, an experimental equipment of triaxial compression is used,Measure-ments of domestic TNT have been made in triaxial and uniaxial compression as a function of tem-perature and strain rate. The exporimental results show that there exists a clear temperature andstrain rate dependence in TNT. Under uniaxial compression TNT failed in a brittle mode and thecompression strength is less than the yield strength,and under triaxial compression there obviouslyexists plastic deformation in the sample,By means the experimental results a constitutive equationis determined. Analysis of the results indicates that by the constitutive equation the strain rate de-pendence and thermo-softening effect of TNT are described.