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Adhesive wear mechanisms uncovered by atomistic simulations
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Abstract
In this review, we discuss our recent advances in modeling adhesive wear mechanisms using coarse-grained atomistic simulations. In particular, we present how a model pair potential reveals the transition from ductile shearing of an asperity to the formation of a debris particle. This transition occurs at a critical junction size, which determines the particle size at its birth. Atomistic simulations also reveal that for nearby asperities, crack shielding mechanisms result in a wear volume proportional to an effective area larger than the real contact area. As the density of microcontacts increases with load, we propose this crack shielding mechanism as a key to understand the transition from mild to severe wear. We conclude with open questions and a road map to incorporate these findings in mesoscale continuum models. Because these mesoscale models allow an accurate statistical representation of rough surfaces, they provide a simple means to interpret classical phenomenological wear models and wear coefficients from physics-based principles.
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Jean-François MOLINARI. He is the director of the Computational Solid Mechanics Laboratory (LSMS) at the École Polytechnique Fédérale of Lausanne (EPFL), Switzerland. He graduated in 1997 with a MS degree in mechanical engineering from the University of Technology of Compiègne, France. He also obtained a MS degree in aeronautics in 1997 from the California Institute of Technology, USA, and graduated with a PhD degree from Caltech in 2001. He then held professor positions at the Johns Hopkins University, USA, and ENS Cachan, France, before joining EPFL. His research interests cover multiscale modeling with applications to fracture mechanics and tribology.
Ramin AGHABABAEI. He obtained his PhD degree in mechanical engineering from National University of Singapore (NUS) in 2012. He joined the Computational Solid Mechanics Laboratory (LSMS) at École Polytechnique Fédérale of Lausanne (EPFL) as a post-doctoral fellow. In September 2017, he joined the Engineering Department of Aarhus University in Denmark, as a tenure-track assistant professor, and the principle investigator of the surface mechanics group (SMG). The research interest of his group is to understand the underlying mechanics and physics of failure in materials surfaces at different scales with application to tribology and manufacturing.
Tobias BRINK. He received his doctoral degree in materials science from the Technische Universität Darmstadt, Germany. He is currently working at the Computational Solid Mechanics Laboratory (LSMS) at the École Polytechnique Fédérale of Lausanne (EPFL) in Switzerland on atomistic simulations of wear at the asperity level. In this context, his research interests include working towards understanding nano-scaled wear mechanisms and how they result in macroscopic wear relations.
Lucas FRÉROT. He holds a bachelor of science and a master of science in civil engineering from the École Polytechnique Fédérale de Lausanne (EPFL), with a focus on computational methods in the modeling of solids and structures. He joined the Computational Solid Mechanics Laboratory at EPFL in 2015 as a PhD student to conduct research on the elasto-plastic contact of solids with rough surfaces, with application to the study of friction and wear.
Enrico MILANESE. He trained as a civil engineer at the University of Padua, Italy, where he received both his bachelor and master degrees. He later investigated fracture avalanche behaviour in porous media at the same university. Since 2016 he is pursuing a PhD at the Computational Solid Mechanics Laboratory at the École Polytechnique Fédérale of Lausanne (EPFL), Switzerland. His current research focusses on surface roughness and adhesive wear.
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2223-7690-06-03-245© The author(s) 2018. This article is published with open access at Springerlink.com
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