Hydrodynamic Lubrication

Hydrodynamic Lubrication

16.02.2017 tribonet
Definition Hydrodynamic lubrication theory is a theory used to reduce friction and/or wear of rubbing solids with the aid of liquid lubricant. For a vast majority of the surfaces encountered in nature and used in […]
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 […]
EHL film meniscus

Elastohydrodynamic Lubrication (EHL)

05.02.2017 tribonet
Definition of EHL Elastohydrodynamic Lubrication – or EHL – is a type of hydrodynamic lubrication (HL) in which significant elastic deformation of the surfaces takes place and it considerably alters the shape and thickness of […]
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 […]
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 […]