Contact Area and Shear Stress in Repeated Single-Asperity Sliding of Steel on Polymer
Contact Area and Shear Stress in Repeated Single-Asperity Sliding of Steel on Polymer
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DOI：
10.1007/s11249-019-1146-y
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发表时间：
2019-02
影响因子：
3.2
通讯作者：
Xianqiang Pei;Leyu Lin;A. Schlarb;R. Bennewitz
中科院分区：
文献类型：
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作者：
Xianqiang Pei;Leyu Lin;A. Schlarb;R. Bennewitz
本文提出了一个计算单凸体在沟槽中反复循环后的接触面积的模型。该模型仅基于微凸体的几何形状和摩擦实验数据，预测微凸体在其自身凹槽中滑动的非对称椭圆接触面积。因此，它允许确定相关几何形状中的钢-聚合物耦合的剪切应力，而不需要对压头或凹槽进行进一步的显微镜检查。以滑动轴承钢和聚醚醚酮（PEEK）为基体的压头为实验对象，对模型进行了验证。在1000次重复循环的实验中，发现接触面积随载荷和滑动速度的变化而变化，而在50-70 MPa的正常压力下，剪切应力为20.5 MPa，当摩擦加热仍然可以忽略时，与速度无关。模型和实验验证推进单凸体摩擦实验成为一种有效的方法来提取剪切应力和接触面积的金属-聚合物接触的滑动摩擦的理解。
A model for the contact area of a single asperity sliding in a groove after repeated cycles is presented. Based only on the asperity geometry and on data from friction experiments, the model predicts the area of the asymmetric elliptical contact of the asperity sliding in its own groove. It thus allows to determine the shear stress of the steel–polymer couple in the relevant geometry without need for further microscopy of indenter or groove. The model was validated by experiments with an indenter manufactured from slide bearing steel and polyether-ether ketone (PEEK) as substrate. In experiments of 1000 repeated cycles, the contact area was found to vary with varying load and sliding velocity, while the shear stress was 20.5 MPa at a normal pressure of 50–70 MPa, independent of velocity when friction heating is still negligible. Model and experimental confirmation advance single-asperity friction experiments into an efficient method to extract shear stress and contact area for an understanding of sliding friction in metal-polymer contacts.