基于DFR的疲劳加速腐蚀因子模型与分析  

Acceleration Corrosion Factor for Fatigue Critical Components Based on the DFR:Modeling and Analysis

作　　者：贺小帆[1] 刘文珽[1] 向锦武[1] 

机构地区：[1]北京航空航天大学,北京100083

出　　处：《应用力学学报》2008年第3期445-449,共5页Chinese Journal of Applied Mechanics

基　　金：北京航空航天大学"凡舟"青年科研基金(20060501)

摘　　要：针对腐蚀条件下飞机结构疲劳分析问题,考虑地面停放预腐蚀的影响,建立了基于疲劳强度的加速腐蚀因子分析方法。以DFR作为结构疲劳强度的度量,以预腐蚀后的疲劳寿命服从双参数威布尔分布为基础,建立了DFR随预腐蚀时间的变化规律,推导得到了加速腐蚀因子的表达式,以及加速腐蚀因子与腐蚀时间无关的结论;并构造了参数估计的线性模型,得到了加速腐蚀因子估计量的近似分布,对其进行了统计分析。To evaluate the fatigue property for aircraft structures in corrosive environment, accounting for the influence of pre-corrosion under ground parking, the analysis of acceleration corrosion factor for accelerated aging test to service or natural exposed environment based on the Detail Fatigue Rating(DFR) of fatigue critical components is performed. Under the assumption that the pre-corrosion fatigue life follows the two-parameter Weibull distribution, the relationship between the DFR and the corrosion time is found, and the expression for acceleration corrosion factor are established. The acceleration corrosion factor is verified to be independent on the corrosion time. The approximate distribution of acceleration corrosion factor estimator is gained, so the confidence intervals of acceleration corrosion factor for LY12CZ aluminum alloys specimen are obtained.

关 键 词：腐蚀 预腐蚀 加速腐蚀 DFR 加速因子 疲劳 可靠性 

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] TG171[金属学及工艺—金属表面处理]