基于寿命包线的飞机典型搭接结构腐蚀疲劳寿命预测

Corrosion and fatigue life prediction of aircraft typical lap structures based on life envelope

针对飞机在腐蚀环境下服役的寿命预测问题,开展了某型飞机机身壁板搭接结构的腐蚀-疲劳交替试验。基于试验结果和飞机结构寿命包线理论体系,建立了该型飞机机身壁板搭接结构在不同服役地区、不同飞行强度下的寿命包线,并基于寿命包线对其剩余寿命进行了预测。通过开展验证试验,将试验结果与计算结果进行对比,发现预测误差为17.4%。说明结构寿命包线是飞机典型搭接结构寿命预测的有力工具,其预测结果是飞机服役过程中检修周期及寿命管理的一项重要参考依据。

The corrosion and fatigue tests of a certain type of aircraft fuselage panel lap structure were conducted alternatively.Based on the test results and the concept of aircraft structure life envelope,the life envelope of the lap joint structure of the fuselage panel in different service areas and under different flight intensities was established.Then,based on this life envelope,the remaining lifetime of the structure was predicted.The prediction error was found to be 17.4%by comparing the experimental results with the calculated results.It is shown that the structural life envelope is a powerful tool for life prediction of aircraft typical lap structures,and its prediction result is an important reference for the maintenance cycle and life management of aircraft in service.