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Multiscale structure of nacre biomaterial: Thermomechanical behavior and wear processes

Stempflé, Philippe and Bourrat, Xavier and Pantalé, Olivier and Njiwa, Richard Kouitat and Jehl, Jean-Philippe and Domatti, Anne and Lopez, Evelyne Multiscale structure of nacre biomaterial: Thermomechanical behavior and wear processes. (2018) Materials Science and Engineering C, 91. 78-93. ISSN 0928-4931

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Official URL: http://dx.doi.org/10.1016/j.msec.2018.05.029


Sheet nacre is a hybrid biocomposite with a multiscale structure, including nanograins of CaCO 3 (97% wt.% – 40 nm in size) and two organic matrices: (i) the interlamellar mainly composed of β-chitin and proteins, and (ii) the intracrystalline composed by silk-fibroin-like proteins. This material is currently contemplated for the manufacture of small prostheses (e.g. rachis and dorsal vertebra prostheses) which are subjected to micro-slip or fretting motion. In this work, the tribological behaviour of nacre is studied by varying the frictional dissipated power from few nW to several hundreds mW, in order to assess 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 and anisotropy of its structure – and especially by its both matrices and respective orientation vs. the sliding direction.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at : https://www.sciencedirect.com/science/article/pii/S0928493117333763?via%3Dihub
HAL Id:hal-01826283
Audience (journal):International peer-reviewed journal
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 - Toulouse INP (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 > Museum National d'Histoire Naturelle - MNHN (FRANCE)
Laboratory name:
Deposited On:29 May 2018 14:27

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