What is asperities lubrication?
Simply stated, an asperity is a high spot (bump) on a surface that either makes contact with an opposing surface or affects the flow of material in a lubricating film or mass of entrained particles. The material of which an asperity is composed can deform elastically, plastically, and/or visco-elastically.
What is meant by asperity?
asperity h-SPAIR-uh-tee\ noun. 1 : roughness of manner or of temper : harshness of behavior or speech that expresses bitterness or anger. 2 : rigor, severity. 3 a : roughness of surface : unevenness.
What is asperities in geography?
An asperity is an area on a fault that is stuck. The earthquake rupture usually begins at an asperity.
What do asperities do?
Asperities are defined as areas between two fault blocks that have a high frictional strength, which leads to fault locking at these locations. They are strong patches on a fault surface that are stressed, which are surrounded by areas where the stress was already released (Lay and Kanamori, 1981).
What is mixed lubrication?
Mixed lubrication is an operating state (regime) of a lubricated contact in which surface roughness ( Surface Roughness) significantly affects the performance of the contact. It may occur with conformal contact lubrication, such as journal bearing lubrication.
What is extreme pressure lubrication?
When the moving or sliding surfaces are under very high pressure and speed, excessive frictional heat will be generated. The high local temperature thus produced at the surfaces, the lubricant fails to stick or get vaporized. This type of lubrication is called extreme pressure lubrication.
How do you remember asperity?
Mnemonics (Memory Aids) for asperity Harshly said -> “As per tea you are not invited”. asperity = austerity; meanings are also same.
How do you use asperity in a sentence?
Asperity in a Sentence 🔉
- When I was a teenager, my father used asperity when he spoke with all my dates in hopes of scaring them away.
- The police officer’s dislike of me was obvious from the asperity with which he demanded my driver’s license.
What is mixed lubrication used for?
Crankshaft bearings in Formula One engines are one example where mixed lubrication is used to minimize friction.
Which is the correct definition of the word asperity?
as·per·i·ty | \\ ə-ˈsper-ə-tē , a-, -ˈspe-rə-\\. plural asperities. 1 : roughness of manner or of temper : harshness of behavior or speech that expresses bitterness or anger He asked with some asperity just what they were implying.
Why are opposing asperities strained in the same way?
If the materials are identical, the opposing asperities will be strained in the same way, whether elastically or plastically. If the yield pressures are significantly different, the softer material may deform elastically or plastically, but the harder one must remain nominally elastic.
Why are asperity particles preferentially abraded away?
Asperities are preferentially abraded away and the particle surface gets smoother and smoother (Fig. 6.4) with processing time leading to lower attrition rates (Fig. 6.3). From: Fluidized Bed Technologies for Near-Zero Emission Combustion and Gasification, 2013
Which is more common asperity or exasperate?
Although it is far less common than “asperity” and “exasperate,” the word asper itself is still occasionally used in English, too – it functions as a synonym of “harsh,” “bitter,” or “stern.”