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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
19 Oct 2009-Langmuir
TL;DR: A cryo-preparation method to visualize the contact area between liquids and superhydrophobic biological surfaces by scanning electron microscopy and demonstrates that this new approach provides detailed insights into the wetting behavior of surfaces in the Cassie state with partial contact with the liquid.
Abstract: The contact area between liquids and solid surfaces plays the crucial role in the wetting and self-cleaning properties of surfaces. In this study, we have developed a cryo-preparation method to visualize the contact area between liquids and superhydrophobic biological surfaces by scanning electron microscopy. Aqueous liquids that do not crystallize during freezing, such as glycerol and phosphoric acid, were used. First, the samples in contact with the liquid droplets were cooled with liquid nitrogen. After this, the droplets were separated and the contact areas on the frozen droplets were visualized by scanning electron microscopy. The contact areas of droplets on various biological and artificial surfaces with microstructure, nanostructure, and hierarchical structures are shown in detail. It could be shown that spaces between nanostructures were not penetrated by the droplet, which rested only on top of the structures. Measurements of the contact areas showed the largest reduction in the solid−liquid con...

59 citations

Journal ArticleDOI
28 Aug 2017-JOM
TL;DR: This review will first discuss various testing protocols including possible challenges and improvements, and focus on different examples showing the direct influence of crystal structure and/or microstructure on the underlying deformation behavior in pure and highly alloyed material systems.
Abstract: Nanoindentation became a versatile tool for testing local mechanical properties beyond hardness and modulus. By adapting standard nanoindentation test methods, simple protocols capable of probing thermally activated deformation processes can be accomplished. Abrupt strain-rate changes within one indentation allow determining the strain-rate dependency of hardness at various indentation depths. For probing lower strain-rates and excluding thermal drift influences, long-term creep experiments can be performed by using the dynamic contact stiffness for determining the true contact area. From both procedures hardness and strain-rate, and consequently strain-rate sensitivity and activation volume can be reliably deducted within one indentation, permitting information on the locally acting thermally activated deformation mechanism. This review will first discuss various testing protocols including possible challenges and improvements. Second, it will focus on different examples showing the direct influence of crystal structure and/or microstructure on the underlying deformation behavior in pure and highly alloyed material systems.

59 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of track vibration with its natural frequency in the vertical and lateral directions on the formation and development of rail corrugation are analyzed in detail, and a model presenting the material loss of unit area proportional to the frictional work density is used to determine the wear of contact surface material of the rail.

59 citations

Journal ArticleDOI
TL;DR: In this article, the elastic, adhesive contact between a rigid, axisymmetric punch and an isotropic, elastic half-space is analyzed and a simple relation exists between the contact stiffness, the contact area and the elastic modulus.
Abstract: Results of Mossakovskii's analysis for the elastic, adhesive (no–slip) contact between a rigid, axisymmetric punch and an isotropic, elastic half–space are developed in order to show that a simple relation exists between the contact stiffness, the contact area and the elastic modulus. The relation is similar to the Bulychev–Alekhin–Shorshorov equation, which is commonly used for evaluation of elastic modulus of materials by nano–indentation. The final formula differs from the frictionless case by a factor that depends on the Poisson ratio of the material. The bounds for the values of the factor are estimated. Similar to the frictionless analysis performed by Pharr, Oliver and Brotzen, the relation is not dependent on the geometry of the punch.

59 citations

Journal ArticleDOI
TL;DR: In this article, the authors used neutron radiography to monitor the infiltration of water through series of aggregates and found that during drainage the hydraulically conducting contact area drastically decreases and the conductivity of the contacts becomes much smaller than that of the aggregates.

59 citations


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