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research-article

An Analytical Model of Mechanistic Wear of Polymers

[+] Author and Article Information
Sandip Panda

Tribology Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, India
sandippanda13@gmail.com

Mihir Sarangi

Tribology Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, India
smihir@mech.iitkgp.ernet.in

S. K. Roy Chowdhury

Tribology Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, West Bengal-721302, India
skrc@mech.iitkgp.ernet.in

1Corresponding author.

ASME doi:10.1115/1.4037136 History: Received January 25, 2017; Revised June 02, 2017

Abstract

This paper proposes a wear model for polymers based on so called mechanistic processes comprising both low cycle fatigue and abrasive wear mechanisms which are prominent in polymer-metal sliding interfaces. Repeated elastic contact causes localized fatigue, whereas abrasive part is an anticipatory outcome of plastic contacts by hard metal asperities on to soft polymer surface. Further, presuming adhesive interactions in elastic-plastic contacts, asperity contact theories with necessary modifications were analyzed to assess load and separation for their subsequent use in elementary wear correlations. Both Gaussian and Weibull distributions of asperity heights were considered to include statistics of surface micro-geometry. Finally, volumetric wear was written in terms of roughness parameters, material properties, and sliding distance. Validation was conducted extensively, and reliability of the formulation was achieved to a large extent. Experimental part of this work included several pin-on-disc tests using PEEK pins and 316L stainless steel discs. Discs with different roughness characteristics generated by polishing, turning and milling were tested. Experimental results agreed well with predictions for the polished surface and with some deviations for other two surfaces. Further, fatigue to abrasive wear ratio was identified as an analytical tool to predict prevailing wear mechanism for polymer-metal tribo-systems. After examining the considered cases, it was both interesting and physically intuitive to observe a complete changeover in wear mechanisms following simply an alteration of roughness characteristics.

Copyright (c) 2017 by ASME
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