Characterization of abrasive wear using degradation coefficient

Document Type

Article

Publication Date

6-15-2020

Abstract

The application of the degradation entropy generation (DEG) theorem in assessing the degradation of tribo-pair experiencing dry as well as lubricated adhesive wear has been recently demonstrated. DEG theorem correlates the degradation forces and the entropy generation through a so-called degradation coefficient, B. The present paper endeavors to extend the application of the method to treat abrasive wear. For this purpose, a pin-on-disk test apparatus is used with pins and abrasives having different hardness ratios with extended tests on abrasives of different types and grit sizes. Results show that the grit number of abrasive sheets exhibited a pronounced effect on the wear rate as well as the friction coefficient. Inclusion of the friction coefficient in the evaluation of the wear coefficient, Kab, reduces the variation with wear rate with the grit size. The effectiveness of using the thermodynamic degradation coefficient B over Kab is demonstrated by determining the wear rate values for extensive sets of experimental results conducted over a wide range of operating conditions. The efficacy of the DEG theorem is demonstrated for a tribo-pair experiencing abrasive wear due to different combinations of particle sizes and types of abrasives. Illustrative examples of the applications of the results to polishing and grinding operations are presented to show the utility of the approach.

Publication Source (Journal or Book title)

Wear

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