PRE-CORROSION FATIGUE NOTCH FACTOR  

预腐蚀疲劳缺口系数(英文)

作　　者：张川[1] 姚卫星[1] 余建航[2] 

机构地区：[1]南京航空航天大学航空宇航学院 [2]陆军航空兵学院机械系

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2011年第4期331-336,共6页南京航空航天大学学报（英文版）

基　　金：Supported by the Program for Changjiang Scholars and Innovative Research Team of Ministry of Education(Irt0906)~~

摘　　要：The notched and smooth specimens of aluminum alloy LC4CS soaked in EXCO solution for different time are tested under the constant amplitude cyclic loading to obtain S-N curves and fatigue notch factors with different pre-corrosion time. By analyzing the corrosion process of LC4CS specimens in EXCO solution, the influ- ence mechanism of corrosion on fatigue notch factor is expounded. Then, a two-parameter model used to describe the change of corrosion fatigue notch factor with time is established and verified by experiment. The results show that the pre-corrosion fatigue notch factor of LC4CS material decreases at first and then increases with the increasing pre-corrosion time. The inflection point appears at the beginning of denudation stage.对在EXCO溶液中预腐蚀后的LC4CS光滑试件和缺口试件进行疲劳试验,得到不同预腐蚀时间的S-N曲线及预腐蚀疲劳缺口系数。通过分析腐蚀过程,阐述了腐蚀对疲劳缺口系数的影响机理,建立了描述预腐蚀疲劳缺口系数的两参数模型,并进行了试验验证。结果表明:LC4CS材料的疲劳缺口系数随预腐蚀时间呈现出先降后升的变化趋势,其拐点出现在剥蚀开始阶段。

关 键 词：PRE-CORROSION EXCO solution fatigue notch factor LC4CS fatigue experiments 

分 类 号：TG174.3[金属学及工艺—金属表面处理]