The micro-plasto-hydrodynamic lubrication (MPHL) model of pit evolution is extended to account for the variation of sliding speed and strain rate in rolling and drawing processes. Results show that all of the following factors are important: pit angle, lubricant viscosity and pressure viscosity coefficient, material yield stress and sliding speed. Theoretical predictions for the change in pit area during the deformation process are well correlated by a non-dimensional group of these parameters. The model agrees reasonably with the measured change in pit volume and area from drawing experiments on cold rolled stainless steel strip containing both artificial and stochastic roughness.
Modeling of Micro-Pit Evolution in Rolling or Strip-Drawing
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division June 22, 2000; revised manuscript received December 7, 2000. Associate Editor: B. O. Jacobson.
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Sutcliffe , M. P. F., Le , H. R., and Ahmed, R. (December 7, 2000). "Modeling of Micro-Pit Evolution in Rolling or Strip-Drawing ." ASME. J. Tribol. October 2001; 123(4): 791–798. https://doi.org/10.1115/1.1352741
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