Tribology Wiki

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Friction Coefficients

09.02.2017 tribonet
Friction Coefficients of Solid Lubricants, Metals and Antifriction Materials Table of friction coefficients of various materials in atmosphere and vacuum (see the definition of friction coefficient). The data was collected from various sources [1,2]. Material […]
Friction Coefficient

Coefficient of Friction

06.02.2017 tribonet
Friction is a force resisting relative motion and may occur at the interface between the bodies, but may also occur within the bodies. The concept of friction coefficient was first formulated by Leonardo da Vinci […]
Fatigue Surface Crack

Rolling Contact Fatigue

25.01.2017 Aydar Akchurin
Rolling-contact fatigue (RCF) is defined as a failure or material removal driven by crack propagation caused by the near-surface alternating stress field.  It is typically considered that if a bearing is properly mounted, aligned, lubricated, […]
Osborne Reynolds

Generalized Reynolds Equation: Derivation

14.01.2017 tribonet
Reynolds equation is one of the fundamental equations of lubrication theory and tribology. In the simplest case, it considers incompressible and Newtonian lubricant. This model is sufficient to describe lubricant friction in some cases (relatively […]
Fatigue Wear

Fatigue Wear

08.01.2017 tribonet
Fatigue wear is a type of wear where a number of cycles is needed to generate debris. The fatigue process in metals may induce the generation of surface and subsurface cracks, which after a critical […]
Greenwoods Contact Model

Greenwood and Williamson Contact Model

04.01.2017 tribonet
Surface roughness was recognized to play a major role in forming friction and transition from one lubrication regime to another [1]. Greenwood pioneered with first rough contact model in 1966 [2]. Inspired by this milestone […]
Wear Particle Image

Wear Particles

06.12.2016 tribonet
The wear process results in generation of debris, or particles, of various size, shape, color distributions and chemical composition[1, 2, 3]. These distributions are dependent on normal load, sliding speed, environment and many other parameters[4]. […]
Corrosive Wear

Corrosive Wear

24.11.2016 tribonet
Corrosive wear occurs when the component operates in a corrosive media, liquid or gas [1, 2]. In this type of wear, the tribochemical reaction between corrosive agent and the bulk material generates a reaction (protective) […]
No Picture

Abrasive Wear

Abrasive wear occurs when a hard surface or hard particles pass over a soft surface, causing loss of material [1]. However, the abrasive grooves can be found on the wear tracks of the sliding friction […]