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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.


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Journal ArticleDOI
TL;DR: A system was developed for measurement of the contact pressure within the wrist joint surfaces based on Fuji pressure‐sensitive paper, which was inserted into the joint space through a dorsal capsular incision to determine pressure distribution properties of the normal radio‐carpal joint.

70 citations

Journal ArticleDOI
TL;DR: In this article, a small pitch transition-edge sensor (TES) X-ray detector optimized for solar astronomy was developed, which is fabricated on thick Si substrates with embedded Cu heat-sink layer and showed a correlation between the stem contact area and a broadening in the spectral line shape indicative of athermal phonon loss.
Abstract: We are developing small pitch transition-edge sensor (TES) X-ray detectors optimized for solar astronomy. These devices are fabricated on thick Si substrates with embedded Cu heat-sink layer. We use 35 x 35 square micrometers Mo/Au TESs with 4.5 micrometer thick Au absorbers. We have tested devices with different geometric absorber stem contact areas with the TES and surrounding substrate area. This allows us to investigate the loss of athermal phonons to the substrate. Results show a correlation between thc stem contact area and a broadening in the spectral line shape indicative of athermal phonon loss. When the contact area is minimized we have obtained exceptional broadband spectral resolution of 1.28 plus or minus 0.03 eV at an energy of 1.5 keV, 1.58 plus or minus 0.07 eV at 5.9 keV and 1.96 plus or minus 0.08 eV at 8 keV. The linearity in the measured gain scale is understood in the context of the longitudinal proximity effect from the electrical bias leads resulting in transition characteristics that are strongly dependent upon TES size.

70 citations

Journal ArticleDOI
TL;DR: In this article, the tangential traction distributions developed when such systems are subjected to loading that varies periodically in time were investigated and it was shown that the system reaches a steady state after the first loading cycle.

70 citations

Journal ArticleDOI
04 Jan 2011-Langmuir
TL;DR: A new model based upon the TCL pinning is developed to explain the different wetting properties of the Wenzel and Cassie models for hydrophilic and hydrophobic cases and predicts the macroscopic contact angle in a broader range accurately, which is consistent with the existing experimental findings.
Abstract: The classical Wenzel and Cassie models fail to give a physical explanation of such phenomenon as the macroscopic contact angle actually being equal to the Young’s contact angle if there is a spot (surface defect) inside the droplet. Here, we derive the expression of the macroscopic contact angle for this special substrate in use of the principle of least potential energy, and our analytical results are in good agreement with the experimental data. Our findings also suggest that it is the triple contact line (TCL) rather than the contact area that dominates the contact angle. Therefore a new model based upon the TCL pinning is developed to explain the different wetting properties of the Wenzel and Cassie models for hydrophilic and hydrophobic cases. Moreover, the new model predicts the macroscopic contact angle in a broader range accurately, which is consistent with the existing experimental findings. This study revisits the fundamentals of wetting on rough substrates. The new model derived will help to de...

70 citations

Journal ArticleDOI
TL;DR: In this article, a microcapsules containing lubricant oil was incorporated into epoxy composites to obtain materials with ultra-low friction and wear performance during sliding wear tests, where the capsules are damaged by the asperities of the counterface, releasing the oil to the contact area.
Abstract: The incorporation of microcapsules containing lubricant oil into epoxy composites leads to materials with ultra-low friction and wear performance. During sliding wear tests, the capsules are damaged by the asperities of the counterface, releasing the oil to the contact area. The lubrication effect of the released oil and the entrapment of wear particles in the cavities left by the ruptured capsules leads to a significant reduction of both the frictional coefficient and the specific wear rate. The approach provides the merits of fluid lubrication but excludes the drawbacks of external lubrication. A minute amount of lubricant oil is sufficient to improve the tribological properties significantly.

70 citations


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