飞机结构寿命包线是飞机结构在安全使用条件下疲劳寿命与日历寿命的边界线;在其概念的基础上,考虑疲劳寿命与日历寿命的相互影响关系,提出了通过预腐蚀疲劳试验确定飞机结构寿命包线的腐蚀影响系数法,建立了典型服役环境下飞机金属结构腐蚀疲劳关键件的剩余寿命预测方法,并给出了在飞行强度变化条件下的剩余寿命预测实例。飞机结构寿命包线确定方法与剩余寿命预测方法的建立,为飞机结构单机寿命(疲劳寿命与日历寿命)监控奠定了基础。
Aircraft structural life envelope (ASLE) is a boundary line of fatigue life and calendar life while aircrafts in service. Based on the concept of ASLE, and considering the interaction between fatigue life and calendar life, a method of determining ASLE by pre-corrosion fatigue tests is proposed as corrosionaffecting coefficient method. A residual life prediction method for corrosion-fatigue critical components of aircraft metal structures under typical environment is established, and a residual life prediction example under condition of variable flight intensities is presented. The establishment of ASLE will pave the way for the structural life (i. e. fatigue life and calendar life) supervision for individual aircraft.