综合使用飞行小时在飞机构件腐蚀疲劳寿命分析中的应用

The Application of Comprehensive Service Flying Hour to the Failure Analysis of Corrosion Fatigue Life of Aircraft Components

飞机使用环境谱中飞行环境谱和停放环境谱的组合就是飞行─停放─飞行环境谱。大多数军用飞机地面停放时间占飞机使用寿命的 90 %以上。海军飞机所处的高温、高湿、高盐雾腐蚀环境对飞机使用寿命有很大影响。腐蚀疲劳直接影响疲劳裂纹形成寿命。飞机使用寿命必须应用飞机使用环境谱 ,考虑飞行小时、日历时间和综合使用飞行小时。列举海军某直升机主桨毂轴向铰轴颈裂纹故障 ,通过波音公司飞机结构疲劳分析方法 ,在飞行小时。

The aircraft service air ground air environmental spectrum consists of two parts: flying environmental spectrum and ground parking environmental spectrum. To most military aircrafts, the ground parking time accounts for more than 90% of the aircraft service life. The service life of aircraft is greatly influenced by the severe environment of naval aircraft where there are 3 highs:high temperature, high humidity and high salt fog corrosion. The service life of aircraft must be determined based on the environmental spectrum of aircraft service, in which factors such as flying time, calendar time and comprehensive service flying time are taken into account. As a typical example, based on the analysis of the axle neck crack of axial hinge in certain type of naval helicopter by utilizing an analytical method of structural fatigue,the overhaul life of the hinge is discussed in respect of flying time, calendar time and comprehensive service flying time.