腐蚀条件下疲劳寿命评定的名义应力法  

Nominal Stress Approach for Fatigue Life Estimationunder Corrosive Environment

作　　者：王忠波[1] 刘文珽[1] 蒋冬滨[1] 贺小帆[1] 

机构地区：[1]北京航空航天大学飞行器设计与应用力学系

出　　处：《北京航空航天大学学报》2003年第2期161-164,共4页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：提出了腐蚀条件下飞机结构疲劳寿命评定的名义应力法 .以地面停放腐蚀影响系数C T曲线为基础 ,通过计算反推建立飞机结构疲劳关键危险部位对应不同地面停放时间的p S N曲线族 ,应用线性累积损伤 (Miner)理论估算飞机结构在使用环境谱载下的疲劳安全寿命 ;考虑空中腐蚀疲劳影响对疲劳安全寿命加以修正 .该方法为腐蚀条件下飞机结构寿命的评定提供了有效可行的技术途径 。In order to estimate fatigue life of aircraft structures under corrosive environment, a nominal stress approach under corrosive condition (Cor NSA) was developed. Based on the curve of parking corrosion influence factor ( C ) versus parking time ( T ), p S N curves for the critical part of an aircraft component can be determined by inverse computation method, corresponding to different parking years. Thus, the fatigue safe life of aircraft structures under service environment could be predicted according to Miner's law. Furthermore, the life should be modified with flight corrosion influence considered. Finally, an example was given to show the validity of the method.

关 键 词：疲劳寿命 腐蚀疲劳 疲劳曲线 飞机结构 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]