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A multiscale tribological study of nacre : Evidence of wear nanomechanisms controlled by the frictional dissipated power

Stempflé, Philippe and Bourrat, Xavier and Kouitat Njiwa, Richard and Pantalé, Olivier and Lopez, Evelyne and Takadoum, Jamal A multiscale tribological study of nacre : Evidence of wear nanomechanisms controlled by the frictional dissipated power. (2012) In: 15th Nordic Symposium on Tribology (NordTrib 2012), 12-15 June 2012, Trondheim, Norway .

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Abstract

Sheet nacre is a hybrid biocomposite with a multiscale structure, including nanograins of CaCO3 (97% wt.% – 40 nm in size) and two organic matrices: (i) the “interlamellar” mainly composed of β-chitin and proteins, and (ii) the “intracrystalline” mainly composed by silk-fibroin-like proteins. This material is currently studied as small prostheses with its tribological behaviour. In this work, the latter is studied by varying the frictional dissipated power from few nW to several hundreds mW, in order to study the various responses of the different nacre’s components, independently. Results reveal various dissipative mechanisms vs. dissipated frictional power: organic thin film lubrication, tablet’s elastoplastic deformations, stick-slip phenomenon and/or multiscale wear processes, including various thermo-mechanical processes (i.e., mineral phase transformation, organics melting and friction-induced nanoshocks process on a large range). All these mechanisms are controlled by the multiscale structure of nacre – and especially by its both matrices and respective orientation vs. the sliding direction.

Item Type:Conference or Workshop Item (Paper)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale Supérieure de Mécanique et des Microtechniques - ENSMM (FRANCE)
Other partners > Institut National Polytechnique de Lorraine - INPL (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Muséum national d'Histoire naturelle (FRANCE)
Other partners > Université de Franche-Comté (FRANCE)
Other partners > Université de Technologie de Belfort-Montbéliard - UTBM (FRANCE)
French research institutions > Bureau de Recherches Géologiques et Minières - BRGM (FRANCE)
Other partners > Université de Lorraine (FRANCE)
Other partners > Université d'Orléans (FRANCE)
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Deposited By: Olivier Pantalé
Deposited On:11 Feb 2013 14:53

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