Elastomers
Glass Transition Temperature It is not clear what is the difference between an “elastomer” and a “rubber”. It is nowadays accepted to use them indistinctively and this is how it is treated in the following […]
Tribology Wiki
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Rheology – The Science Behind Material Flow
Rheology is the science of flow and deformation of a particular matter that describes the interrelation between force, deformation and time. It is the study of how materials respond to applied stress or strain. Rheology performs […]
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 […]
What is grease?
Grease Grease is a semisolid liquid that consists of a liquid lubricant mixed with a thickener. The oil does the lubricating while the thickener holds the oil and provides a resistance to flow. Soaps (a […]
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 […]
Starvation
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
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
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 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 […]
Types of Lubricant Additives
What Are Lubricant Additives? The additive content in lubricating oils ranges from just a few parts per million to several percentage points. Depending on the function that the additives develop they may be classed as: […]