多轴微动疲劳损伤行为

Multi-axial Fretting Fatigue Behavior

通过柱面对柱面的接触方式,对35CrMoA钢在拉扭复合载荷作用下的低周微动疲劳特性进行研究,并采用光学显微镜和扫描电子显微镜对微动疲劳试样的微动斑和断口形貌进行观察,讨论分析了微动摩擦磨损对材料微动疲劳失效行为的影响。结果认为,微动区产生的氧化物磨屑加剧了表层材料的磨损,微动摩擦还促使疲劳裂纹源加速萌生,最终使材料在微动摩擦磨损区边缘断裂失效。

The model of cylinder shape surface contact was applied to the investigation of fretting fatigue failure characters of 35CrMoA under multi-axial cyclic loading.And the fretting wear scar and fracture morphology were examined by optical microscope and scanning electronic microscope.The effect of fretting wear on material fatigue failure was discussed,too.Results of this study indicate that the oxide debris produced in the wear scar play important roles to surface material damage;fretting wear can accelerate the initiation of fretting fatigue crack and lead to material failure at the boundary of fretting and non-fretting area.