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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
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Journal ArticleDOI
TL;DR: Elastic deformation lowers the relative contact area at which contact patches percolate in comparison to traditional approaches to seals and suppresses leakage through contacts even far away from the percolation threshold.
Abstract: We study fluid flow at the interfaces between elastic solids with randomly rough, self-affine surfaces. We show by numerical simulation that elastic deformation lowers the relative contact area at which contact patches percolate in comparison to traditional approaches to seals. Elastic deformation also suppresses leakage through contacts even far away from the percolation threshold. Reliable estimates for leakage can be obtained by combining Persson's contact mechanics theory with a slightly modified version of Bruggeman's effective-medium solution of the Reynolds equation.

152 citations

Journal ArticleDOI
01 Jan 2004-Carbon
TL;DR: In this paper, the authors investigated the nanoscopic nature of surface/interphases in terms of topography, fractography, adhesion and stiffness, and showed that variations in both adhesive and attractive forces on oxidized high modulus and intermediate modulus (IM) carbon fiber surfaces appear to result from the coating layer.

152 citations

Journal ArticleDOI
TL;DR: In this paper, a model was developed to predict the thermal contact resistance of carbon nanotube (CNT) array interfaces with CNT arrays synthesized directly on substrate surfaces.

151 citations

Journal ArticleDOI
TL;DR: In this article, the cutting forces acting on the engaged cutting edge elements are calculated using an empirical method using the Z-map of the surface geometry and current cutter location to determine cutting edge element engagement.
Abstract: The cutting force in ball-end milling of sculptured surfaces is calculated. In sculptured surface machining, a simple method to determine the cutter contact area is necessary since cutting geometry is complicated and cutter contact area changes continuously. In this study, the cutter contact area is determined from the Z-map of the surface geometry and current cutter location. To determine cutting edge element engagement, the cutting edge elements are projected onto the cutter plane normal to the Z-axis and compared with the cutter contact area obtained from the Z-map. Cutting forces acting on the engaged cutting edge elements are calculated using an empirical method. Empirical cutting mechanism parameters are set as functions of cutting edge element position angle in order to consider the cutting action variation along the cutting edge. The relationship between undeformed chip geometry and the cutter feed inclination angle is also analyzed. The resultant cutting force is calculated by numerical integration of cutting forces acting on the engaged cutting edge elements. A series of experiments were performed to verify the proposed cutting force estimation model. It is shown that the proposed method predicts cutting force effectively for any geometry including sculptured surfaces with cusp marks and a hole.

150 citations

Journal ArticleDOI
TL;DR: In this paper, a method for determining the stiffness of a sub-micron indentation contact area is presented, which allows measurement of elastic modulus as well as plastic hardness, continuously during a single indentation, and without the need for discrete unloading cycles.
Abstract: A new, differential method for determining the stiffness of a sub-micron indentation contact area is presented. This allows measurement of elastic modulus as well as plastic hardness, continuously during a single indentation, and without the need for discrete unloading cycles. Some of the new experiments that become possible with this technique, especially at the nanometre scale, are described. We show quantitatively that electropolished tungsten reproducibly exhibits the ideal theoretical lattice strength at small indentation loads.

147 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023102
2022253
2021375
2020467
2019554
2018528