陈旭, 李建军, 陈刚, 王磊
AuthorsHTML:陈旭, 李建军, 陈刚, 王磊
AuthorsListE:Chen Xu, Li Jianjun, Chen Gang, Wang Lei
AuthorsHTMLE:Chen Xu, Li Jianjun, Chen Gang, Wang Lei
Unit:天津大学化工学院，天津 300072
Unit_EngLish:School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Abstract_Chinese:针对机械工业中广泛存在的微动疲劳失效问题, 自主设计开发了一套接触载荷实时可控的微动疲劳试验系统, 研究了恒定接触载荷和交变接触载荷对6061-T651铝合金微动疲劳寿命的影响．结果表明：在交变接触载荷条件下, 存在一个临界接触载荷使得微动疲劳寿命最低, 且微动疲劳寿命随着平均接触载荷的增加呈现先减小后增加的变化行为; 在低接触载荷作用下, 交变接触载荷条件下的微动疲劳寿命明显低于恒定接触载荷条件下的微动疲劳寿命; 在高接触载荷作用下, 交变接触载荷与恒定接触载荷对微动疲劳寿命的影响相近．
Abstract_English:Fretting fatigue failure is a common existence in the mechanical engineering field. A self-designed fretting loading device，which is capable of applying a constant or cyclic contact pressure to specimen，was developed in this study. A series of fretting fatigue tests on 6061-T651 aluminum alloy under constant contact pressure as well as cyclic contact pressure were investigated. The test results show that there existed a critical mean contact pressure，which resulted in a minimum fretting fatigue life of 6061-T651 aluminum alloy when it was subjected to cyclic contact pressure. The fretting fatigue life dropped rapidly first and then increased slowly with the increase of the mean contact pressure. For the mean contact pressure at low level，furthermore，the fretting fatigue life under cyclic contact pressure was considerably lower than that under constant contact pressure. But for the mean contact pressure at high level，the effect of constant contact pressure and cyclic contact pressure on the fretting fatigue life showed no differences.
Keyword_Chinese:微动疲劳; 交变接触载荷; 微动面; 铝合金
Keywords_English:fretting fatigue; cyclic contact pressure; fretting area; aluminum alloy

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