航天飞机薄壁结构的可靠性分析

对航天飞机结构常用的蒙皮骨架组成的薄壁结构,提出一种考虑损伤容限和耐久性设计要求的结构系统可靠性分析方法,以此为航天结构系统的可靠性设计提供参考.对加劲板进行可靠性分析,分析了3种主要破坏模式,得出了损伤容限设计要求下,失效模式表达式及失效概率;同时给出耐久性要求下的主要失效模式和失效概率;最后通过加劲板的损伤容限和耐久性分析及失效模式的相关性分析,得出加劲板结构系统的可靠性.分析结果表明:失效模式相关性对系统可靠度影响很大,因而航天飞机薄壁结构的可靠度计算的关键是损伤容限和耐久性失效模式及相关性分析,另外桁架的载荷集中系数对可靠性影响也必须引起重视.

Reliability analysis of thin-walled structures for space shuttle

A reliability analysis method was studied to consider the design requirements for damage tolerance and durability of conventional thin-walled structures consisting of envelope-framework of space shuttles.By the reliability analysis (three main failure modes) of this plane of putting strength, research was done on this paper to present the expression and probability in failure modes with the design requirements for damage tolerance, and the expression and probability in failure modes with the requirements of durability. By this analysis,and considering the relativity between the failure modes, the reliability index of the plane structure of putting strength was calculated. The example shows that the relativity has more influence on system analysis, so it is a key problem to analyze the failure modes and their relativity of the damage tolerance and durability in reliability calculation for the thin-walled structure of the space shuttles. In addition, the load concentrated coefficients in the truss-frame structures, which influence reliability, must be regarded.