Mechanistic Studies in Friction and Wear of Bulk Materials

Abstract

From the context of a contemporary understanding of the phenomenological origins of friction and wear of materials, we review insightful contributions from recent experimental investigations of three classes of materials that exhibit uniquely contrasting tribological behaviors: metals, polymers, and ionic solids. We focus on the past decade of research by the community to better understand the correlations between environment parameters, materials properties, and tribological behavior in systems of increasingly greater complexity utilizing novel synthesis and in situ experimental techniques. In addition to such review, and a half-century after seminal publications on the subject, we present recently acquired evidence linking anisotropy in friction response with anisotropy in wear behavior of crystalline ionic solids as a function of crystallographic orientation. Although the tribological behaviors of metals, polymers, and ionic solids differ widely, it is increasingly more evident that the mechanistic origins (such as fatigue, corrosion, abrasion, and adhesion) are essentially the same. However, we hope to present a clear and compelling argument favoring the prominent and irreplaceable role of in situ experimental techniques as a bridge between fundamental atomistic and molecular processes and emergent behaviors governing tribological contacts. 395 Annu. Rev. Mater. Res. 2014.44:395-427. Downloaded from www.annualreviews.org Access provided by University of Utah -Marriot Library on 11/27/14. For personal use only.

Advances in nonequilibrium molecular dynamics simulations of lubricants and additives

“…In 2013, Vanossi et al [12] summarised advances in nanoscale to mesoscale modelling of wet and dry friction while and in the same year Dong et al [13] discussed NEMD studies of dry friction in the context of atomic force microscopy (AFM) experiments. In 2014, Sawyer et al [14] provided a more general overview of recent advances in the understanding of dry friction, including the contribution of NEMD. The reader should refer to these contributions for specific details on these topics.…”

A Review of Transfer Films and Their Role in Ultra-Low-Wear Sliding of Polymers

“…In addition to producing thinner and more uniform transfer films, low-wear alumina-PTFE transfer films are obviously discolored [13,18,20,[23][24][25][26][27]29,31,32,[37][38][39], which suggests chemical reactions had taken place and possibly enhanced adhesion of the transfer film. In 2013, Ye and Burris used optical microscopy to determine the degree to which transfer films persist during sliding [20].…”

Multiscale Frictional Properties of Cotton Fibers: A Review

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