Abstract Running-in of sliding surfaces is a highly complex process that often defines the tribological properties of a contact. With a view to optimizing a tribosystem, more and more industrial research focuses on the mechanisms that occur during running-in. Such studies can nowadays benefit from the progress shown in the field of in situ tribometry. In this work, we present a novel approach to measure and separate the plowing and shear terms of the friction force [1] , in the ideal case of a hard sphere sliding on a plane surface. The experiments were performed with ruby spheres and flat steel pins sliding against a flat copper surface immersed in poly alpha olefin (PAO8). A custom built tribometer was employed to measure the widening of plowing tracks within the wear scar. In these measurements, the relative motion of the surfaces in contact was performed in a linear reciprocating manner. Different methods to distinguish between plowing friction and sliding friction are compared. Our results with spherical sliders show that the widening rate of the wear track is linearly proportional to the plowing term, provided that the spheres do not sink in the Cu sample rapidly. Further experiments with flat on flat demonstrate the potential of expanding this method to multi-asperity systems in order to better understand the dynamics of sliding surfaces during running-in.

中文翻译：

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一种在耕作过程中将摩擦系数与地形测量联系起来的新方法

摘要 滑动面的磨合是一个高度复杂的过程，通常定义接触的摩擦学特性。为了优化摩擦系统，越来越多的工业研究集中在磨合过程中发生的机制。如今，此类研究可以受益于原位摩擦测量领域的进展。在这项工作中，我们提出了一种新方法来测量和分离摩擦力的犁和剪切项 [1]，在硬球在平面上滑动的理想情况下。实验是用红宝石球和扁钢针在浸入聚 α 烯烃 (PAO8) 的平面铜表面上滑动。使用定制的摩擦计来测量磨损痕内犁道的加宽。在这些测量中，接触面的相对运动以线性往复方式进行。比较了区分耕作摩擦和滑动摩擦的不同方法。我们使用球形滑块的结果表明，只要球体不会迅速下沉到 Cu 样品中，磨损轨迹的加宽率与犁形项成线性比例。进一步的平对平实验证明了将这种方法扩展到多凹凸系统的潜力，以便更好地了解磨合过程中滑动表面的动力学。前提是球体不会在 Cu 样品中迅速下沉。进一步的平对平实验证明了将这种方法扩展到多凹凸系统的潜力，以便更好地了解磨合过程中滑动表面的动力学。前提是球体不会在 Cu 样品中迅速下沉。进一步的平对平实验证明了将这种方法扩展到多凹凸系统的潜力，以便更好地了解磨合过程中滑动表面的动力学。