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为考察外界环境对固体火箭发动机的影响,基于热粘弹性模型,利用有限元方法对其装药进行了温度循环条件下的顺序热应力耦合模拟,给出了温度场和应力场,建立了基于应力的累积损伤模型,研究了其累积损伤及主要影响因素。结果表明,温度循环条件下,装药内部产生交变应力,导致损伤累积。温度转换期间累积损伤增长较快,特别是在高温向低温转换期间,影响最大,并且随着升降温速率的增加,累积损伤显著增加。这为准确评估外界环境对固体火箭发动机的影响提供了参考。
In order to investigate the influence of the external environment on the solid rocket motor, based on the thermal viscoelastic model, the coupled thermal stress of the charge was simulated by the finite element method under the temperature cycling condition. The temperature field and the stress field were given. Stress cumulative damage model to study the cumulative damage and the main influencing factors. The results show that, under the temperature cycling conditions, the internal stress generated by the charge, resulting in damage accumulation. The cumulative damage increased rapidly during temperature conversion, especially during the transition from high temperature to low temperature, and the cumulative damage increased significantly with the increase of temperature and temperature. This provides a reference for accurately assessing the impact of the external environment on the solid rocket motor.