Reliability design of CFRP solid rocket motor vessel based on the burst experiment
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摘要: 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。Abstract: Eight carbon fiber reinforced plastics (CFRP) pressure vessels were manufactured according to GJB 1878-94 and experiments were conducted to obtain the probabilistic dist ribution of design variables,such as the fiber strength,winding angle,geometric size,burst strength and so on. The reliability design for solid rocket motor vessels based on the experimental data was compared with the traditional safety factor design. The results show that the reliability design of CFRP solid rocket motor vessel effectively unitized the safety and requirements of composite vessel design. The variance level of burst strength of CFRP solid rocket motor vessel is influenced by the variance level of some variables,such as fiber strength,winding angle,geometric size. And not only the variance level of winding angle,but also the mean value of the winding angle influence the variance level of the burst strength.
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Key words:
- CFRP /
- solid rocket motor vessel /
- safety factor /
- reliability design /
- variance level
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