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为分析硝酸酯增塑聚醚(NEPE)推进剂低温力学性能,通过低温和低温恢复常温单轴拉伸试验,考察了低温条件下NEPE推进剂力学性能的变化情况。采用原位拉伸扫描电镜和环境扫描电镜分别观察了推进剂拉伸过程中和拉断后的微观表面形貌,对比分析了推进剂的动态力学性能。结果表明:在低温拉伸条件下,NEPE推进剂主要表现为基体撕裂;而在低温恢复常温拉伸条件下,主要以颗粒与基体的“脱湿”破坏为主。在低温和低温恢复常温条件下的推进剂力学性能变化不大,结合定应变实验结果,表明NEPE推进剂低温下具有较强的抵抗损伤能力。
In order to analyze the low temperature mechanical properties of NEPE propellant, the change of mechanical properties of NEPE propellants at low temperature was investigated through the recovery of normal temperature uniaxial tensile tests at low temperature and low temperature. The in-situ tensile scanning electron microscopy and environmental scanning electron microscopy were used to observe the microscopic surface topography of the propellant during and after tensile fracture respectively. The dynamic mechanical properties of the propellants were compared. The results show that under the condition of low temperature stretching, the NEPE propellants mainly show the matrix tearing, while under the condition of low temperature recovery and normal temperature stretching, the “desiccation” of the particles and the matrix is the main factor. The mechanical properties of the propellants did not change much under the condition of low temperature and low temperature recovery. Combined with the experimental results of the constant strain, it shows that NEPE propellant has strong resistance to damage at low temperature.