Surface topography can affect the tribological performance in many applications. The influence of surface roughness and topographic orientation on friction wear dry oil lubricated steel vs diamond-like carbon (DLC) coated DLC sliding contacts was investigated. surfaces had a centerline average (Ra) between 0.004 0.11 μm groove 0°, 45° 90° with respect to direction. Tests conducted showed that s...

The possibility of using an aqueous non-toxic electrolyte ammonium nitrate and glycerin for the cathodic plasma electrolytic nitrocarburizing low-carbon steel is considered in this paper. Surface morphology roughness, element phase compositions, microhardness modified layer were investigated. Kinetic calculations processes nitrogen carbon diffusion into surface are proposed, taking account thei...

Abstract A numerical method is proposed to evaluate the effect of non‐Gaussian roughness on point contact elastohydrodynamic lubrication (EHL). mixed EHL model contact, considering roughness, developed. The oil film pressure in was controlled by Reynolds equation average flow, and asperity obtained rough surface micro‐contact model. influence parameters distribution, thickness profile ratio loa...

The available coefficient of friction (ACOF) for human locomotion is the maximum coefficient of friction that can be supported without a slip at the shoe and floor interface. A statistical model was introduced to estimate the probability of slip by comparing the ACOF with the required coefficient of friction, assuming that both coefficients have stochastic distributions. This paper presents an ...

A number of WC-Co cemented carbides with 6–12 wt. % Co were machined and surface finished by grinding or Electrical Discharge Machining (EDM). EDM was executed in deionised water through several consecutive gradually finer steps. Correlations between Material Removal Rate (MRR), surface finish and EDM parameters were derived. The quality and integrity of surface finishes were analysed by Scanni...

We have replaced the periodic Prandtl-Tomlinson model with an atomic-scale friction model with a random roughness term describing the surface roughness of micro-electromechanical systems (MEMS) devices with sliding surfaces. This new model is shown to exhibit the same features as previously reported experimental MEMS friction loop data. The correlation function of the surface roughness is shown...

If the nominal contact tractions at an interface are everywhere below the Coulomb friction limit throughout a cycle of oscillatory loading, the introduction of surface roughness will generally cause local microslip between the contacting asperities and hence some frictional dissipation. This dissipation is important both as a source of structural damping and as an indicator of potential frettin...

Wear behavior is influential to improve friction drive and wear lifespan of actuators or motors, which work at an elliptical locus vibration. Sliding wear tests of metallic friction pairs are conducted by a laboratory rig of ultrasonic vibration. Surfaces of the different metallic sliders are characterized using surface roughness, Abbott curves and fractal dimension. Results show that surface r...

BACKGROUND An important constituent of an orthodontic appliance is orthodontic brackets. It is either the bracket or the archwire that slides through the bracket slot, during sliding mechanics. Overcoming the friction between the two surfaces demands an important consideration in an appliance design. The present study investigated the surface roughness of four different commercially available s...