固化降温-立式贮存下固体火箭发动机装药结构响应缩比关系研究

In order to study the scaling relationship of solid rocket motor grain structural response under the curing and cooling-vertical storage load， under the assumption of elasticity, based on the three basic equations of elasticity and considering the influence of temperature，the dimensional analysis method was used to define the characteristic quantities of each parameter to derive the scale similarity criterion of solid rocket motor grain structural response. Considering the creep effect the finite element software is used to analyze the structural response of the grain and the grain/insulation interface after 1 year of curing and cooling-vertical storage, and the applicability of the scale similarity criterion under different conditions is discussed. The relationship among the axial displacement of the front and rear ends of the grain and the time and scale ratio is established. Based on this relationship, the maximum axial displacement of the grain end after 3 years of vertical storage is predicted. The results show that the established scaling similarity criterion is suitable for curing and cooling conditions. Under vertical storage conditions, the stress and strain distribution along different characteristic paths of different scaling ratios grain are similar，and the difference is not more than 4%. but the stress response of grain/insulation interface is quite different. After 3 years of vertical storage，the error between the predicted value and the calculated value of the maximum axial displacement at the end of the grain is less than 3%.