基 于 载 荷 共 享 理 论 的 多 传 力 路 径 耳 片 可 靠 性 研 究

The inspection period of aircraft structure needs to ensure that the structure has certain reliability during service. Due to the related failure of each layer lug in multiple load path lug structure，the traditional reliability analysis method of parallel system is no longer applicable to the reliability analysis of this structure. To solve this problem，a reliability modeling method for multiple load path lug structure based on load-sharing parallel systems is proposed. Firstly，based on the basic theory of load-sharing parallel system and lug design rules，the load-sharing principle and life equivalent principle of multiple load path lug structure are determined. On this basis，the conditional probability and full probability formulas are used to establish reliability model of any three-force-transmission lug structure，and they are applied to the verification of the structure inspection period. Finally，the application of the Al-Ti-Al composite connection lug structure is analyzed，which verified the applicability and effectiveness of the method. The results show that，compared with traditional reliability models of parallel system and reliability analysis methods based on lognormal distribution model，the proposed method can well reflect the related failures among lug structures，and is more consistent with the failure characteristics of multiple load path lug structures. Therefore，this paper provides a new method for reliability analysis，which can be used to check and optimize the inspection period.