复合固体推进剂蠕变分析研究进展

Research Progress in Creep Properties of Composite Solid Propellant

从宏细观尺度通过实验测试、本构模型以及机理对复合固体推进剂的蠕变性能进行了分析,并总结了当前研究中的不足、解决方案以及需要进一步开展的研究。分析表明,蠕变加载过程中的恒定应力控制是目前研究中的难点,可以借鉴其他粘弹性材料的蠕变测试方法进行研究;固体推进剂蠕变过程中不同阶段的蠕变细观结构变化的观测方法虽然比较缺乏,但可以采用微CT和小试件加载装置结合的方式对其蠕变过程的细观变化进行研究。固体推进剂蠕变本构模型与实际需求还有较大差距,可以通过引入损伤函数,对复合固体推进剂蠕变的整个过程进行描述;复合固体推进剂不同阶段的蠕变机理缺乏相应的研究,还需对其蠕变过程不同阶段的蠕变机理进一步研究。

The creep performance of composite solid propellant was reviewed from the macro and meso experimental methods,constitutive models and creep mechanism.The current shortages and future researches contents were proposed.Up to now,the constant stress control during the creep loading process was difficult point in the current research.Solving this problem can refer to the creep test methods of other viscoelastic materials.Though the observation methods of the creep mesoscopic change at different stages during the creep process of the solid propellant were limited,the mesoscopic change of the creep process can be studied by combining the micro CT and the small specimen loading device.There is a great gap between the practical need and the current studies on the constitutive models of solid propellant creep,the whole process of creep of composite solid propellant can be described by introducing a damage function.The creep mechanism at different stages of the creep process of the composite solid propellant can be further discussed through the experimental methods proposed.