What is cold welding? Cold welding is a process, where two clean, flat surfaces of metal do strongly adhere if brought into contact while in a vacuum without fusion or heating at the interface. Physically […]
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 […]
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 […]
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 […]
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 […]
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 […]
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, […]
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 […]
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 […]
