Mid-life scuffing failure in automotive cam-follower contacts
Mid-life scuffing failure in automotive cam-follower contacts
复制标题
汽车凸轮从动件接触件的中年磨损故障
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
P. Willemse
中科院分区：
文献类型：
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作者：
J. C. Bell;P. Willemse
有几个实际重要的工程系统，在最初的磨合完成后很长一段时间内由于磨损而失效。这些系统的一个共同特点是配合表面上相同点之间的重复接触。通过定期监测凸轮从动件表面粗糙度和磨损的发展，对导致这种中期磨损失效的过程进行了研究，并在发动机上进行了一系列气门机构磨损试验。通过应用粗糙表面弹性接触的统计和数值模型，确定了磨损过程的以下阶段：(a)轻度磨损状态下的表面粗化，逐渐增加最大粗化接触压力，直到(b)超过弹性安定极限，导致塑性变形磨损，加速粗化和谷的扩大，最终导致(c)过渡到高磨损率，可能是由动水压力损失和油膜崩溃造成的。
Abstract There are several practically important engineering systems that fail by scuffing long after the initial running-in has been completed. A common feature of these systems is repeated contact between the same points on the mating surfaces. The processes leading up to such mid-life scuffing failures have been examined by monitoring the development of cam follower surface roughness and wear at regular intervals during a series of valve train wear tests in a fired engine. By the application of both statistical and numerical models for the elastic contact of rough surfaces, the following stages in the scuffing process have been identified: (a) surface roughening in the mild-wear regime, which progressively increased maximum asperity contact pressures until (b) the elastic shakedown limit was exceeded, causing plastic deformation wear, accelerated roughening and enlargement of valleys, leading eventually to (c) a transition to high rates of wear, probably resulting from hydrodynamic pressure loss and oil-film collapse.