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作为一种燃料,复合固体推进剂(以下简称推进剂)为火箭提供巨大的动力。由推进剂制成的药柱必须有足够的强度和耐久性,以防止在貯存、运输及运行过程中发生破损。因此,在药柱的研制、设计中需要了解和掌握推进剂的力学性能,进行各种工况下药柱的结构完整性分析以及作必要的强度、刚度或稳定性计算和寿命预测。推进剂材料是由高分子基体和固体颗粒(含量86～90%)混合而成,其力学性能依赖于时间、温度及加载和变形历史。在变形过程中还件随有微孔穴、微裂纹的萌生、演变、聚结以及分子链、键断裂等损伤现象,其宏观表象相当复杂。对这类材料的力学性
As a fuel, composite solid propellants (hereinafter referred to as propellants) provide great power for rockets. The pellets made of propellant must have sufficient strength and durability to prevent damage during storage, transport and operation. Therefore, it is necessary to know and master the mechanical properties of propellants during the development and design of the pellets. The structural integrity analysis of the pellets under various working conditions and the calculation of the necessary strength, stiffness or stability and prediction of life expectancy should be carried out. Propellant material is a mixture of polymer matrix and solid particles (content 86-90%), its mechanical properties depend on the time, temperature and loading and deformation history. In the process of deformation, the micro-cavities, the initiation, evolution and coalescence of microcracks and the damage phenomena such as molecular chains and bond ruptures are also involved in the deformation process. The macroscopic appearance is rather complicated. Mechanics of this type of material