表面微凹坑和纹理方向对界面摩擦的耦合影响

发布时间：2018-03-30 11:00

本文选题：各向异性　切入点：表面纹理　出处：《中国机械工程》2017年11期

【摘要】：选取三种不同纹理的铝合金试样,并在试样上加工不同面积占有率的规则圆形微凹坑,利用自制的摩擦试验装置,在油润滑条件下以不同接触压力进行摩擦试验,试验过程中滑动方向与表面纹理方向的夹角分别为0°、45°、90°。利用非接触式三维轮廓仪测量试验前后试样的三维表面形貌,并选取Sa、Str、Vvv、Vvc等表面表征参数来分析滑动接触界面表面形貌的变化。结果表明:表面纹理方向的差异导致铝合金表面在滑动接触摩擦过程中表现出各向异性,而在其表面加工不同面积占有率的微凹坑,减弱了铝合金表面纹理方向性对界面摩擦的影响,反映出表面微凹坑和纹理对界面摩擦的耦合作用。同时界面摩擦对试件的表面形貌也有明显的影响,Str、Vvv、Vvc在试验后发生了规律性的变化。
[Abstract]:Three kinds of aluminum alloy samples with different textures were selected, and the regular circular micropits with different area occupancy were processed on the samples. Friction tests were carried out under different contact pressures under oil lubrication conditions by using a self-made friction test device. The angle between the direction of sliding and the direction of surface texture is 0 掳~ 45 掳~ 90 掳. The surface morphology of the sample before and after the test is measured by using a contactless three-dimensional profilometer. Surface characterization parameters such as Sag Strand VvvvC were selected to analyze the variation of the surface morphology of sliding contact interface. The results show that the surface texture of aluminum alloy surface exhibits anisotropy during sliding contact friction process due to the difference of surface texture direction. The effect of grain directivity on the interface friction is weakened by machining the micro-pits with different area occupancy on the surface of the aluminum alloy. It reflects the coupling effect of surface micropits and textures on the interface friction, and the interface friction also has a significant effect on the surface morphology of the specimens.
【作者单位】：合肥工业大学机械工程学院;
【基金】：国家自然科学基金资助项目(51375132)
【分类号】：TH117.1

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