On the Debris-Level Origins of Adhesive Wear
On the debris-level origins of adhesive wear Ramin Aghababaeia,b, Derek H. Warnerc, and Jean-Franc¸ois Molinaria,b,1 aInstitute of Civil Engineering, Ecole´ Polytechnique Fed´ erale´ de Lausanne, CH 1015 Lausanne, Switzerland; bInstitute of Materials Science and Engineering, Ecole´ Polytechnique Fed´ erale´ de Lausanne, CH 1015 Lausanne, Switzerland; and cSchool of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14853 Edited by David A. Weitz, Harvard University, Cambridge, MA, and approved June 1, 2017 (received for review January 17, 2017) Every contacting surface inevitably experiences wear. Predicting contact junctions with sizes above a critical junction size, which is the exact amount of material loss due to wear relies on empiri- a function of bulk and interfacial properties. This finding opens cal data and cannot be obtained from any physical model. Here, the possibility of quantifying the amount of detached materials we analyze and quantify wear at the most fundamental level, i.e., in the form of debris particles and studying the origins of macro- wear debris particles. Our simulations show that the asperity junc- scopically observed wear relations. tion size dictates the debris volume, revealing the origins of the Inspired by this finding (19), this report aims to address how long-standing hypothesized correlation between the wear vol- much material is detached during sliding contact, by focusing on ume and the real contact area. No correlation, however, is found the quantification of wear and the above-mentioned wear rela- between the debris volume and the normal applied force at the tions at the most fundamental level, i.e., wear debris particles.
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