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针对改性双基推进剂在不同载荷条件下表现出不同力学响应的现象,对其进行了恒应变率拉伸和压缩试验及蠕变拉伸和压缩试验,获得了4组应变率下拉压应力-应变曲线和3组温度下拉压蠕变-时间曲线,使用应力和应变拉压不对称因子反映了拉伸和压缩曲线的不对称程度。结果表明,改性双基推进剂具有明显的拉压不对称力学性能,且该性能受到应变率和温度的影响。分析了改性双基推进剂具有拉压不对称性的内在成因,认为材料初始缺陷的扩展、材料分子链移动空间的变化、基体材料与填充颗粒材料力学性能的不同是导致改性双基推进剂具有拉压不对称力学性能的内在原因。
In view of the phenomenon that the modified double-base propellants exhibit different mechanical responses under different load conditions, the constant strain rate tensile and compressive tests and the creep tensile and compressive tests were carried out. Four sets of strain rate tensile and compressive stresses - Strain Curves and Tensile Creep vs. Time Curves at Three Temperatures, Using Stress and Strain Tension Asymmetry factors reflect the degree of asymmetry in tensile and compression curves. The results show that the modified double - base propellants have obvious mechanical properties of tension and compression, and the properties are affected by strain rate and temperature. The inherent causes of asymmetric tension and compression of the modified double-base propellants are analyzed. It is considered that the initial defects of the material expand, the movement of the material molecular chain changes, and the difference of the mechanical properties between the matrix material and the filler particle material leads to the modified double base propellant Agents with tension and compression asymmetry mechanical properties of the underlying causes.