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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Adams, Michael
University of Birmingham
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2018Inkjet-Printed Photoluminescent Patterns of Aggregation-Induced-Emission Chromophores on Surface-Anchored Metal–Organic Frameworkscitations
- 2018Temperature and configurational effects on the Young’s modulus of poly (methyl methacrylate)citations
- 2018Reaction of porphyrin-based surface-anchored metal-organic frameworks to prolonged illumination
- 2018Reaction of porphyrin-based surface-anchored metal–organic frameworks caused by prolonged illumination
- 2017Contact mechanics of the human finger pad under compressive loadscitations
- 2017Facile loading of thin-film surface-anchored metal-organic frameworks with Lewis-base guest moleculescitations
- 2017Facile loading of thin-film surface-anchored metal-organic frameworks with Lewis-base guest moleculescitations
- 2011Effect of batch size on mechanical properties of granules in high shear granulationcitations
- 2009Microscopic interpretation of granule strength in liquid mediacitations
- 2005On the interpretation of orifice extrusion data for viscoplastic materialscitations
Places of action
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article
Contact mechanics of the human finger pad under compressive loads
Abstract
The coefficient of friction of most solid objects is independent of the applied normal force because of surface roughness. This behaviour is observed for a finger pad except at long contact times (> 10 s) against smooth impermeable surfaces such as glass when the coefficient increases with decreasing normal force by about a factor of five for the load range investigated here. This is clearly an advantage for some precision manipulation and grip tasks. Such normal force dependence is characteristic of smooth curved elastic bodies. It has been argued that the occlusion of moisture in the form of sweat plasticises the surface topographical features and their increased compliance allows flattening under an applied normal force so that the surfaces of the fingerprint ridges are effectively smooth. While the normal force dependence of the friction is consistent with the theory of elastic frictional contacts, the gross deformation behaviour is not and, for commonly reported values of the Young’s modulus of stratum corneum, the deformation of the ridges should be negligible compared with the gross deformation of the finger pad even when fully-occluded. The current paper describes the development of a contact mechanics model that resolves these inconsistencies and is validated against experimental data.