Tribology Wiki


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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) […]

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Abrasive Wear

24.11.2016

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 […]

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Adhesive Wear

24.11.2016 tribonet

Adhesive wear occurs when two solids are in a sliding contact and the atomic bonding forces occurring between the materials on the interface are stronger than the strength of the surrounding area in either of […]

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Wear

24.11.2016 tribonet

Definition Wear is defined as a surface damage of one or all solid surfaces in contact subject to relative motion. Wear might have different patterns corresponding to various wear mechanisms. A surface can be subject […]

Da Vinci Tribology

Friction

22.11.2016

  Friction Definition Friction is a force acting opposite to the direction of relative motion. Friction rises on the interface between bodies, but may also develop within the body.Examples of the latter include air and […]