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.
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