载人潜水器耐压壳体结构疲劳可靠性分析

为保障深海环境下载人潜水器正常工作和潜水员生命安全，以4500 m级载人潜水器的耐压壳体为研究对象，基于结构可靠性理论和有限元分析方法进行疲劳分析，基于应力 干涉模型对疲劳可靠性进行计算。计算结果显示，壳体在使用周期4000次内是安全的，考虑壳体开口处应力集中的影响，其疲劳可靠度指标由4.555 2降低至2.034 5，在载人潜水器耐压壳体结构设计时，应采取必要的加强措施减小开口位置的应力集中。该研究为载人潜水器耐压壳体的结构设计和疲劳寿命估算提供了理论依据。

Fatigue reliability analysis of pressure shell structure for manned submersible

In order to ensure the normal operation of manned submersible and the divers′ life safety in deep sea environment, the pressure shell of the 4500 m manned submersible was taken as the research object, and the fatigue analysis was carried out based on structural reliability theory and finite element analysis method, the fatigue reliability was calculated based on stress interference model. The calculation results show that the shell is safe within 4000 service cycles. Considering the influence of stress concentration at the opening of the shell, the fatigue reliability index was reduced from 4.555 2 to 2.034 5, so necessary reinforcement measures should be taken to reduce the stress concentration at the opening position when designing the structure of the pressure submersible shell. This study provides a theoretical reference for structural design and fatigue life estimation of manned submersible pressure shells.