Wear maps derived from thermodynamic principles

Document Type

Article

Publication Date

6-15-2026

Abstract

Wear maps are developed to quantify degradation in dry-sliding tribo-pairs using the Degradation Entropy Generation (DEG) theorem, which is rooted in the principles of irreversible thermodynamics. The DEG theorem relates material deterioration to the rate of entropy generation via a proportionality constant known as the degradation coefficient ( B ). Leveraging B as a unifying parameter, the proposed map provides a multi-variable description of degradation behavior within a single, coherent framework suitable for assessing tribological performance. To demonstrate its effectiveness, twenty controlled wear experiments were conducted on aluminum alloy A390 sliding against stainless steel SS304. The resulting data were categorized according to the governing wear mechanisms, and corresponding B values were extracted from frictional response, pin displacement, and ex-situ surface characterization using 3D profilometry and high-resolution imaging. The constructed map delineates distinct operational regimes, enabling rapid identification of wear-dominant zones and suitability for specific tribological applications. An illustrative use case demonstrates the practical utility of the proposed framework.

Publication Source (Journal or Book title)

Wear

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