Topic
Contact area
About: Contact area is a research topic. Over the lifetime, 12358 publications have been published within this topic receiving 256401 citations. The topic is also known as: contact patch & contact region.
Papers published on a yearly basis
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TL;DR: In this article, the effect of the tip radius on the hardness of the indentation was investigated. But the authors focused on the impact of tip radius only on the surface of the indenter.
59 citations
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TL;DR: In this article, a model to study the contact between two purely longitudinally rough surfaces based on the parabolic indentor problem in elasticity is described, where rough surfaces are characterized with three parameters: rms roughness, autocorrelation length, and bearing area.
Abstract: This paper describes a model to study the contact between two purely longitudinally rough surfaces based on theparabolic indentor problem in elasticity. Rough surfaces are characterized with three parameters: rms roughness, autocorrelation length, and bearing area. Problems encountered by conventional roughness models are treated here. It is shown that the average contact pressure and real contact area obtained from this model agree very well with a computationally more intensive model developed by Lee (1989), up to the bulk yielding pressure
59 citations
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TL;DR: In this article, the effect of angular eccentric error on gear geometry is more sensitive than that of radial eccentric error, and the length of contact pattern is firstly decreased and then increased in one period.
59 citations
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TL;DR: A revision of the elastoplastic contact model of fractal rough surfaces, initiated by Majumdar and Bushan, is further developed in this article, where the critical contact areas of a single asperity are scale dependent.
59 citations
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TL;DR: In this article, the dynamic contact angle θ and the radius r of sessile drops on solid surfaces have simultaneously been determined in dependence on time after drop application between about 3·10−2 s and long times.
Abstract: The viscosityη
L and the surface tensionγ
L of the liquid as well as the equilibrium contact angleθ
e are essential parameters governing the wetting kinetics of liquids on solids. By means of a contact angle apparatus with video image digitization, the dynamic contact angle θ and the radiusr of the contact area of sessile drops on solid surfaces have simultaneously been determined in dependence on time after drop application between about 3·10−2 s and long times. The measurements were performed with series of liquids: polydimethylsiloxanes with different molecular masses and solutions of polyisobutylene in decalin and polyacrylic acid in water, covering a wide range of concentrations. The liquids in each series have a constant surface tension, but viscosities ranging over about four orders of magnitude, allowing the influence ofη
L andγ
L to be studied independently. Solids such as glass, polyethylene and polytetrafluoroethylene were chosen so that the cases of complete wetting (spreading) and partial wetting (θ
e) could be studied. The curves of cosθ andr/R
0 vs. time for the different liquids of a series can be superimposed to a master curve by plotting them againstγ
L·tη
L·R
0, whereR
0 is the radius of the original drop. All these master curves coincide at small wetting times, with exception of the data for the polysiloxanes. That means that the early stage of the wetting process is determined only by the properties of the wetting liquid. The influence of the solid surface, characterized by the equilibrium contact angleθ
e becomes significant only at the end of the wetting process.
59 citations