There are several solutions suggested to develop the unified approach to tribological testing of oils. For evaluation of the coefficient of friction and wear, it is suggested to monitor friction force, normal load, and in-situ wear dynamics, as well as to clearly distinguish the running-in and stable-wear components. Tests on lab-bench testers are recommended to start from obtaining a Stribeck curve in a wide range of loads and speeds. During the tests, monitoring additional parameters of contact acoustic emission and contact electrical resistance is beneficial for sensitive and comprehensive characterization of oils and greases.
Effective Tribology Testing of Lubricating Oils
Gitis, N. "Effective Tribology Testing of Lubricating Oils." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 1. Washington, D.C., USA. September 12–16, 2005. pp. 429-430. ASME. https://doi.org/10.1115/WTC2005-63078
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