预腐蚀疲劳退化加速因子研究  

Investigation of acceleration factor for pre-corrosion fatigue degradation:model and analysis

作　　者：贺小帆[1] 杨洪源[1] 刘文珽[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083

出　　处：《航空动力学报》2008年第7期1328-1333,共6页Journal of Aerospace Power

基　　金：北京航空航天大学"凡舟"青年科研基金(20060501)

摘　　要：考虑预腐蚀对材料疲劳性能的影响,以疲劳强度作为腐蚀量,给出了考虑预腐蚀疲劳退化的加速腐蚀因子的定义和表达式,并结合疲劳分析方法,以细节疲劳额定值(DFR)作为疲劳强度的衡量,给出了预腐蚀条件下的DFR确定方法,通过加速环境和实际服役环境下DFR随预腐蚀时间退化规律的对比分析,建立基于DFR的加速腐蚀因子,并进行参数估计,最后,给出了LY12CZ铝合金试件在典型环境下的加速腐蚀因子取值.The acceleration corrosion factor （ACF） for accelerated corrosion test under service or natural exposed environment is the most important parameter in the accelerated corrosion test （ACT）. The material property was degraded seriously in pre-corrosion environment, and the corrosion damage was characterized by fatigue strength. So, the acceleration factor was defined as the ratio of fatigue strength in different environments, and the ex pression was proposed in consideration of the degradation process of fatigue strength with corrosion time. To evaluate the fatigue property, the pre corrosion fatigue life was assumed to follow the two parameter Weibull distribution, the detail fatigue rating （DFR） method in pre-corrosion environment was proposed, and the relationship between the DFR and the corrosion time was expressed as an exponential function. The acceleration corrosion factor based on the DFR was proposed by comparing the degradation process in accelerated corrosive environment and the natural exposed environment, and was proved to be a constant regardless of corrosion time. Finally, the typical ACF of LY12CZ Aluminum alloy specimen was calculat ed.

关 键 词：加速因子 腐蚀 预腐蚀 加速腐蚀 细节疲劳额定值(DFR) 疲劳 

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]