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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 deform through elastic and plastic modes, increasing the contact area between the two surfaces until the contact
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The relationship between frictional interactions and asperity geometry is complex and poorly understood. It has been reported that an increased roughness may under certain circumstances result in weaker frictional interactions while smoother surfaces may in fact exhibit high levels of friction owing
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provides a simplified model of asperity deformation when materials in contact are subject to a force. Due to the ubiquitous presence of deformable asperities in self affine hierarchical structures, the true contact area at an interface exhibits a linear relationship with the applied normal load.
149:. Smooth surfaces, even those polished to a mirror finish, are not truly smooth on a microscopic scale. They are rough, with sharp, rough or rugged projections, termed "asperities". Surface asperities exist across multiple scales, often in a self affine or
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Zappone, B.; Rosenberg, K.J.; Israelachvili, J. (2007). "Role of nanometer roughness on the adhesion and friction of a rough polymer surface and a molecularly smooth mica surface".
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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.
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Carbone, G.; Bottiglione, F. (2008). "Asperity contact theories: Do they predict linearity between contact area and load?".
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The top image shows asperities under no load. The bottom image depicts the same surface after applying a load.
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279:: 121–131.
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232:"Asperity"
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