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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 19990914-17; Leeds(GB) >An investigation of sliding metallic wear in the presence of thin film boundary lubrication
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An investigation of sliding metallic wear in the presence of thin film boundary lubrication

机译：薄膜边界润滑条件下滑动金属磨损的研究

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摘要

An asperity interaction model is given in which the frictional force results from the pushing of waves of plastically deforming material in the softer surface ahead of asperities on the harder surface. Evidence is presented to show that the lubrication at the hard asperity-wave interface is elastohydrodynamic in nature. This means that the surfaces are separated in the regions of asperity contact by a highly effective lubricant film. As a consequence the possibility of metallic adhesion between the contacting surfaces is virtually eliminated and adhesive wear is highly unlikely to occur. It is becoming increasingly clear that in such situations wear results from the surface damage which occurs with the repeated straining of the softer surface by successive wave passes. From the slipline field model used to represent the wave formation process it can be shown that the strain cycle undergone by the deforming material consists of cyclic and unidirectional (ratchetting) components. Results of a metallographic study of the surface damage resulting from repeated wave passes in wedge tests (scaled-up hard asperity) are presented. These show how low cycle fatigue can lead to crack propagation into the softer surface and how ratchetting can rotate these cracks to be more or less parallel to the surface. With subsequent wave passes the tongues of material thus formed can then be broken off to form wear particles.
机译：给出了一个粗糙相互作用模型，其中摩擦力是由在较硬表面上的凹凸之前推动较软表面中的塑性变形材料波产生的。证据表明，硬质子波界面的润滑本质上是弹性流体动力。这意味着表面在粗糙接触区域内被高效的润滑膜隔开。结果，实际上消除了接触表面之间的金属粘附的可能性，并且极不可能发生粘附磨损。越来越清楚的是，在这种情况下，磨损是由于表面损坏而引起的，这种损坏是由于连续的波通过而使较软的表面反复变形而发生的。从用来表示波形成过程的滑移场模型可以看出，变形材料所经历的应变循环由循环和单向（棘轮）分量组成。呈现了金相研究的结果，该结果是由楔形测试（按比例放大的硬粗糙度）中的重复波通过而导致的表面损伤的结果。这些表明低周期疲劳如何导致裂纹扩展到较软的表面中，以及棘手现象如何使这些裂纹或多或少地平行于表面旋转。随着随后的波浪通过，由此形成的材料的舌状物然后可以折断以形成磨损颗粒。

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