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| 1 | Service life prediction of AP/Al/HTPB solid rocket propellant with consideration of softening aging behavior显示文摘The aging behavior of softening composite solid propellant was investigated by measuring its mechanical and ballistic prosperities during prolonged storage at elevated and room temperatures. Accelerated aging was conducted at 65 °C for 231 days while the normal aging was performed at 25 ± 3 °C and relative humidity less than 50% for 8 years. The mechanical properties were obtained from uniaxial tensile tests for the aged propellant specimens while the ballistic properties were determined from static firing tests of subscale motors aged for 112 days at 65 °C. The mechanical results show that the maximum tensile strength and Young's modulus initially increase and subsequently decrease with increasing aging time, while the maximum tensile strain generally increases with increasing aging time. The ballistic properties like burning rate show a small change which cannot affect the ballistic performance. The experimental results show that the changes in the mechanical properties are significant during the aging period, but the burning rate does not undergo significant changes. From this study, it is observed that the propellant ages through a combination of reactions like post-cure, oxidative cross-linking, chain scission, and hydrolysis. The chain scission and the hydrolysis effect are the most significant process, which makes the propellant soft and extendible. The observed aging mechanism has been modeled using an exponential function with two terms which can describe the complex behavior of the aging. By applying Arrhenius equation,the activation energy values were obtained based on the propellant mechanical properties. The shelf life of this propellant formulation at 25 °C is predicted to be 13 years using the modulus as failure criteria and control parameter. | Walid M.ADEL Guozhu LIANG | 2019 | Chinese Journal of Aeronautics2019，32，2： | 4 |
| 2 | 一种固体推进剂药柱结构完整性的快速评估方法显示文摘为了实现固体推进剂药柱结构完整性的快速评估,首先从推进药柱的动态模量入手,建立了一种动态载荷作用下药柱等效模量快速实时评估方法;然后提出了温度应变系数和压力应变系数的概念,建立了动态载荷工况下药柱等效应变和等效应力的计算模型,可得到药柱内部危险位置在各个时刻的等效应变、等效应力的变化情况;并与基于线黏弹性理论的有限元模拟计算结果进行了对比。结果表明,两种计算方法得到的3种固化降温曲线下,药柱危险位置的等效应变和等效应力的最大差值分别为4.60%、4.74%;3种点火增压曲线下药柱危险位置的等效应变和等效应力的最大差值分别为1.93%和1.23%;且该评估方法计算所需时间大大减少,可用于固体推进剂药柱结构完整性的快速评估。 | 张路 余瑞 邓康清 庞爱民 杨玲 | 2018 | 火炸药学报2018，41，2： | 3 |
| 3 | NEPE推进剂应力松弛试验研究显示文摘针对NEPE(硝酸酯增塑聚醚)推进剂,开展了温度、应变、加载速率等因素对应力松弛试验影响规律的研究。利用推导的应力松弛方程,指出了各因素影响程度大小。结果表明:随测试温度的升高,NEPE推进剂的松弛模量逐步降低;随初始应变的增加,其松弛模量逐步增加,且初始应变的影响与推进剂的拉伸曲线形状密切相关;加载速率对NEPE推进剂的松弛特性影响不大。 | 王小英 唐泉 李伟 潘新洲 | 2020 | 化学推进剂与高分子材料2020，18，2： | 0 |
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