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Towards a unified classification of wear

Friction 2013年第4期1卷 333-340页

作者： michael varenberg Department of Mechanical Engineering Technion-IITHaifa 32000Israel

Since the beginning of the systematic study of wear,many classification schemes have been ***,though covering the whole field in sum,they stay only loosely connected to each other and do not build a complete general *** this end,here we try to combine and integrate existing approaches into a general simple scheme unifying known wear types into a consistent *** suggested scheme is based on three classifying criterions answering the questions“why”,“how”and“where”and defining a 3-D space filled with the known wear *** system can be used in teaching to introduce students to such complex phenomena as wear and also in engineering practice to guide wear mitigation initiatives.

关键词： relative motion energy dissipation surface disturbance surface state surface damage

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Assessing workability of greased bearings after long-term storage

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Friction 2019年第5期7卷 489-496页

作者： michael varenberg Yuri KLIGERMAN Grigory HALPERIN Saad NAKAD Haytam KASEM George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA30332USA Department of Mechanical Engineering Technion-Israel Institute of TechnologyHaifa32000Israel Department of Mechanical Engineering Azrieli College of EngineeringJerusalem9103501Israel

Here, we developed a technique to assess the workability of sealed-for-life greased rolling bearings after a long-term storage. In this framework, we devised a model of equivalent transition between the conditions of natural ageing under daily and seasonally fluctuating temperature, and the conditions of accelerated thermal ageing at a constant high temperature. The tested bearings were thermally aged, and then their steady state friction and outer ring temperature were examined in a custom high-speed spindle. These results were compared to the performance of a reference new bearing tested under the same loading conditions. Our findings suggest that long-term storage can significantly degrade the performance of sealed-for-life greased rolling bearings. However, a proper running-in can substantially deter the ageing-driven degradation of the bearings.

关键词： grease lubrication ball bearings thermal ageing lubricant degradation

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