椭圆形路径载荷下的微动疲劳失效特征  

The fretting fatigue failure characters under elliptical path loading

作　　者：刘兵[1] 何国球[1] 蒋小松[1] 向学渊[1] 胡正飞[1] 朱旻昊[2] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]西南交通大学牵引动力国家重点实验室,成都610031

出　　处：《材料科学与工艺》2011年第3期97-101,共5页Materials Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2007CB714704);国家自然科学基金资助项目(50771073);教育部"新世纪优秀人才支持计划"项目(NCET-05-0388)

摘　　要：为了解微动疲劳失效机理,通过柱面对柱面的接触方式,研究了60Si2Mn钢在椭圆形路径、拉扭耦合作用下的多轴低周微动疲劳特性,深入分析讨论了不同轴向循环拉伸应力幅值对摩擦磨损表面和断口形貌的影响.结果认为:磨损区产生的氧化物磨屑对微动区磨擦损伤行为具有显著影响;微动摩擦磨损对试样表面的影响深度只有数十微米;微动疲劳裂纹源形成于微动摩擦磨损区的边缘;裂纹源有氧化现象发生,并附着有细小的氧化物磨屑.To study the failure mechanism of fretting fatigue,in the present paper,cylinder shape surface was applied to conduct the investigation of fretting fatigue failure characters of 60Si2Mn under elliptical path loading.And the effect of axial cyclic tensile stress amplitude on fretting wear scar and fracture morphology was studied.The results indicate that the oxide debris produced in the contact wear scar play an important role to the surface damage;and the effect of fretting wear on the materials exists just tens of microns beneath the specimen surface.It is found that the fretting fatigue crack initiate at the edge of wear scar with oxide debris on it.

关 键 词：微动疲劳 磨擦磨损 失效分析 断口形貌 

分 类 号：TG142.42[一般工业技术—材料科学与工程]