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为考察定应变作用下NEPE推进剂的老化特性,研究了20%定应变作用下NEPE推进剂贮存老化过程中力学性能、凝胶性能和界面性能的变化。研究结果表明:定应变作用下NEPE推进剂在贮存老化过程中最大抗拉强度降低,最大延伸率变化较小,其老化失效主要表现为强度的失效;定应变下NEPE推进剂的凝胶百分数和粘附功随老化时间的延长而降低,NEPE推进剂粘合剂基体的降解断裂和界面的“脱湿”是其主要的老化机理;定应变下NEPE推进剂的力学性能与细观性能的相关性研究表明,最大抗拉强度与凝胶百分数和粘附功存在相关关系,计算了其关系式,建立了由细观性能评估推进剂宏观力学性能的方法;选择最大抗拉强度下降30%时失效,20%定应变下NEPE推进剂的贮存寿命为8.3年。
To investigate the aging behavior of NEPE propellants under constant strain, the changes of mechanical properties, gel properties and interfacial properties of NEPE propellants during storage and aging were investigated. The results show that the maximum tensile strength of NEPE propellant during storage aging decreases and the maximum elongation changes little. The aging failure of NEPE propellants mainly shows the failure of strength. The gel fraction of NEPE propellant at constant strain The adhesion work decreased with the aging time. The degradation mechanism of the NEPE propellant binder matrix and the “de-wetting” interface were the main aging mechanisms. The mechanical and microscopic properties of NEPE propellant under constant strain The correlation study shows that the maximum tensile strength is related to the percentage of gel and adhesion work, the relationship is calculated, and the macroscopic mechanical properties of propellants are established by the meso performance. The maximum tensile strength is reduced by 30 % Failure, 20% of the NEPE propellant storage life of 8.3 years.