Tribology Wiki

Tribology Wikipedia has the same goal as the well-known Wikipedia: share knowledge from around the globe and create an encyclopedia accessible to anyone. Of course, Tribology Wiki has an emphasis in Tribology! Everyone is invited to read, write, edit and share Wikis. Please contact us via email if you would like to contribute an article or if you have any suggestions! You can create an article by going to Create New tab in any of the existing articles (you must be logged-in)
creep failure
Creep Deformation

Background The meaning of creep as per the English dictionary is as follows: creep is essentially an act of moving slowly and carefully in order to avoid being heard or noticed. Well, this is what […]

Density of Oil
Density of Oil

What is oil density? Oil density is a crucial property not only in lubricants but in all fluids. For instance, as the density of a lubricant increases, the fluid becomes thicker. This leads to an […]


It is said that a contact operates under “starvation conditions” when an increase of oil supply at the contact would result in an increase of the film thickness at the contact. In other words, when […]

Viscosity Index Calculation
Viscosity Index

What is viscosity index? The viscosity index (VI) is an arbitrary, unitless measure of a fluid’s viscosity change relative to a temperature change. We can say that the it is the dimensionless number that shows how the […]

flame hardening
Flame Hardening

What is flame hardening? By putting the solid red-hot steel into water ( producing martensite), and tempering the quench-hardened steel at a moderate temperature, have been known and used for thousands of years. The extensively […]

spalling failure ring
Spalling Damage

Bearing Failure Modes Bearing damage, and ultimately, failure, can be caused by a variety of conditions, including improper mounting, poor lubrication, and overloading, to name a few. The mode of damage — what actually happened […]