asperityəˈspɛr ɪ ti
asperity (adj)
English Definitions:
asperity, grimness, hardship, rigor, rigour, severity, severeness, rigorousness, rigourousness (noun)
something hard to endure
"the asperity of northern winters"
asperity, sharpness (noun)
harshness of manner
asperity (Noun)
Roughness as of stone or weather.
asperity (Noun)
Harshness, as of temper.
asperity (Noun)
Something that is harsh and difficult to endure.
asperity (Noun)
A part of a geological fault line that does not move.
Asperity
In materials science, asperity, defined as "unevenness of surface, roughness, ruggedness", has implications in physics and seismology. Smooth surfaces, even those polished to a mirror finish, are not truly smooth on an atomic scale. They are rough, with sharp, rough or rugged projections, termed "asperities". When two macroscopically smooth surfaces come into contact, initially they only touch at a few of these asperity points. These cover only a very small portion of the surface area. Friction and wear originate at these points and thus understanding their behavior becomes important when studying materials in contact. When the surfaces are subjected to a compressive load, the asperities plastically deform, increasing the contact area between the two surfaces until the contact area is sufficient to support the load. The Archard equation provides a simplified model of asperity deformation when materials in contact are subject to a force.
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