Cavitation
Cavitation is a phenomenon that occurs when a liquid is subjected to a pressure drop that causes its pressure to fall below its vapour pressure. This forms vapour bubbles within the fluid, collapsing as the […]
Tribology Wiki
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What Are Lubricants?
Definition Lubricant is a substance which is used to control (more often to reduce) friction and wear of the surfaces in a contact of the bodies in relative motion [1]. Depending on its nature, lubricants […]
Galling
What is galling? Severe types of adhesive wear are often referred as galling, scuffing, welding or smearing, although these terms are sometimes used loosely to describe other types of wear. In metal-to-metal wear tests, high […]
Pin on Disk Test
What is a Pin on Disk Test? Friction and wear (typically wear rates and wear resistance) characterization of materials is typically performed using various types of tribometers, while pin on disk test being probably one […]
Four Ball Tester
What is a Four Ball Tester? Oil lubrication and lubrication technologies are essential in reducing friction and wear losses in machines. The key in efficiency of the frictional system is a lubricant (grease, oil, solid […]
Triboluminescence
What is Triboluminescence? Triboluminescence is tribology phenomenon resulting in the generation of light through creating any frictional interaction between the materials. The term for this phenomenon comes from a combination of the greek word for […]
Fretting, fretting corrosion and fretting mechanisms
What is fretting? Fretting or fretting wear is a specific wear type which is characterized by low amplitude oscillating sliding between bodies, which are nominally at rest [1] (for example due to vibration, cyclic stresses, […]
Solid-solid contact
Introduction The solid-solid contacts are formed when there is an asperity-to-asperity interaction at the interface of two surfaces. This contact is caused due to the interatomic interactions that lead to adhesion. Further, the adhesion of […]
Journal bearing
Introduction The application of using rotary machines to convert the rotating energy from different sources to useful energy is well known. For these rotating machines, there is always one rotating part that is separated from […]
Wear of materials
Introduction The materials undergo wear due to various reasons, the mechanical action exerted on its surface, the environmental factors, the physical and chemical nature, due to the process like fatigue and creep, etc. It is […]