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基于固体火箭发动机药柱的热黏弹模型,利用有限元方法对不同外界环境温度降温条件以及材料属性下的药柱温度应力进行了分析,研究了不同降温幅度、降温速率、初始温度及推进剂平衡模量、泊松比、热膨胀系数对药柱温度应力的影响.结果表明,降温幅度、降温速率、初始温度对药柱温度应力影响显著,但不管降温幅度、降温速率、初始温度如何,温度应力随着温度的下降不断增加.在温度下降初期,温度应力增长缓慢,而在后期温度应力增长较快;推进剂材料参数对危险点的应力也有显著影响,推进剂膨胀系数和平衡模量对应力的影响有相同的趋势.
Based on the thermal viscoelastic model of the solid rocket motor grain, finite element method was used to analyze the thermal stress under different ambient temperature conditions and the material properties. The effects of different cooling rate, cooling rate, initial temperature and propellant The results show that temperature range, cooling rate and initial temperature have significant effects on the temperature stress of the grain, but no matter the temperature drop, the cooling rate, the initial temperature, the temperature The stress increases with the decrease of the temperature.When the initial temperature drops, the temperature stress grows slowly, while the temperature stress increases rapidly in the late stage. The material parameters of the propellant also have a significant effect on the stress of the dangerous point. The expansion coefficient and the equilibrium modulus of the propellant correspond The effect of force has the same tendency.