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纤维增强复合材料在许多领域得到广泛应用,固体火箭发动机壳体就是一例。因此,分析其不同内压下的应力及预报爆破压力是十分重要的。复合材料结构承载过程的应力分析,需进行单元失效判断,许引入失效单元的刚度衰退,这种方法是最合理的。本文采用该方法并结合大变形有限元分析理论,计算了某一纤维缠绕固体火箭发动机壳体的应力和爆破压力,数值计算结果与实测数据吻合,证明该方法可用于纤维缠绕复合材料结构的应力及强度分析,值得重视。
Fiber-reinforced composites are widely used in many fields and solid rocket motor housings are an example. Therefore, it is very important to analyze the stress under different internal pressures and predict the burst pressure. The stress analysis of the load-bearing process of composite structures needs to judge the unit failure, which may lead to the decline of the stiffness of the failed unit. This method is the most reasonable. In this paper, combined with the theory of large deformation finite element analysis, the stress and burst pressure of a fiber-wound solid rocket motor shell are calculated. The numerical results are in good agreement with the measured data. The results show that this method can be applied to the stress of the fiber-wound composite structure And strength analysis, it is worth attention.