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根据GJB 1878-94制备了8个碳纤维缠绕复合材料压力容器,通过试验获得壳体的纤维强度、缠绕角、几何尺寸、爆破压强等随机变量特征值,利用这些实验数据对固体火箭发动机壳体进行可靠性设计,并与传统的安全系数法设计进行比较。结果表明,使用可靠性安全系数法设计可以实现安全性和经济性的统一。分析了材料的力学性能参数及壳体的几何参数等随机变量的变异系数对CFRP固体火箭发动机壳体爆破压强分散程度的影响。纤维应力、壳体纤维层厚度和壳体半径的变异系数的大小直接影响了爆破压强的分散程度;而纤维缠绕角除其变异系数的大小直接影响爆破压强的分散程度外,其参数均值也对爆破压强的分散程度有影响。
According to GJB 1878-94, eight carbon fiber wrapped composite pressure vessels were prepared, and the characteristic values of random variables such as fiber strength, winding angle, geometric size and burst pressure of the shell were obtained through experiments. The solid rocket motor shell was made using these experimental data Reliability design, and compared with the traditional design of safety factor method. The results show that the use of reliability factor safety factor design can achieve the unity of safety and economy. The influence of the variation coefficient of random variables, such as the mechanical properties of the material and the geometrical parameters of the shell, on the burst pressure distribution of the CFRP solid rocket motor shell was analyzed. The variation of fiber stress, shell fiber layer thickness and shell radius directly affects the dispersion degree of the burst pressure. The average value of the parameters of the fiber winding angle, in addition to its coefficient of variation, directly affects the degree of dispersion of the burst pressure Burst pressure dispersion has an impact.