ABSTRACT

A novel cyclic-thermal method is proposed for accelerated thermo-chemical ageing of composite solid propellants including the diurnal and seasonal variations in temperature, the main environmental factor. For accelerated ageing corresponding to natural ages of up to 5 years, natural variations during 24 hours were reduced to 90 to 214 minutes by increasing the mean temperature using Arrhenius relationship and heat diffusion analysis. Degradation, in terms of physical and tensile properties, indicates that the ambient temperature variations (temperature rate) have a significant effect on propellant ageing. Ageing-related stiffening, embrittlement, and reduction in dewetting strain indicate onset of particle-binder interface failure.

摘要

提出了一种新的循环热方法来加速复合固体推进剂的热化学老化，包括温度的昼夜和季节变化，这是主要的环境因素。对于对应于长达 5 年的自然年龄的加速老化，通过使用阿伦尼乌斯关系和热扩散分析增加平均温度，将 24 小时内的自然变化减少到 90 到 214 分钟。就物理和拉伸性能而言，降解表明环境温度变化（温度速率）对推进剂老化有显着影响。与时效相关的硬化、脆化和去湿应变的降低表明颗粒-粘合剂界面失效的开始。