Role of Surface Texture, Roughness, and Hardness on Friction During Unidirectional Sliding

Abstract

In the present investigation, experiments were conducted by unidirectional sliding of pins made of FCC metals (Pb, Al, and Cu) with significantly different hardness values against the steel plates of various surface textures and roughness using an inclined pin-on-plate sliding apparatus in ambient conditions under both the dry and lubricated conditions. For a given material pair, it was observed that transfer layer formation and the coefficient of friction along with its two components, namely adhesion and plowing, are controlled by the surface texture of the harder mating surfaces and are less dependent of surface roughness (R a ) of the harder mating surfaces. The effect of surface texture on the friction was attributed to the variation of the plowing component of friction for different surfaces. It was also observed that the variation of plowing friction as a function of hardness depends on surface textures. More specifically, the plowing friction varies with hardness of the soft materials for a given type of surface texture and it is independent of hardness of soft materials for other type of surface texture. These variations could be attributed to the extent of plane strain conditions taking place at the asperity level during sliding. It was also observed that among the surface roughness parameters, the mean slope of the profile, D a , correlated best with the friction. Furthermore, dimensionless quantifiable roughness parameters were formulated to describe the degree of plowing taking place at the asperity level.

Increasing the coefficient of sliding friction of NiCr at low loads by interstitial surface hardening

“…The large stresses that develop due to the high concentration of interstitials cause severe near-surface plastic deformation that results in uneven uplift of the surface. The influence of surface roughness on friction has been the subject of extensive investigation [8][9][10][11][12][13], and its effect is complicated by many factors, including ductility, shear strength, and ambient conditions [14].…”

Correlations between third body evolution and tribological performance of copper-matrix friction material under abrasive paper interference conditions

“…In practice, the most used parameter for surface roughness description is Ra. 17 Staph et al 18 studied the effect of surface roughness on scuffing using steel discs of varying roughnesses, and concluded that the surface roughness influence the frictional behavior. In the literature, [19][20][21] attempts were made to study the influence of surface roughness parameters on friction coefficient.…”

Transformation mechanism of microstructure and residual stress within hardening layer in PSHG

“…It uses the grinding heat directly to carry on thermal treatment on the surface of specimen, and reduces the procedures of thermal treatment of work, the thermal treatment equipment and the staff. It reduces resources and pollution in accordance with green manufacture and the clean production pattern (Xiu, et al, 2007) (Zhang, et al, 2007) (Menenzes, et al, 2011) (Slowinski and Nadolny, 2007) (Liu, et al, 2006). Although these two technologies have their own advantages, each of them has its shortage.…”