Skip to Main content Skip to Navigation
Conference papers

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

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.
Complete list of metadatas

https://hal-insu.archives-ouvertes.fr/insu-00840808
Contributor : Nathalie Pothier <>
Submitted on : Wednesday, July 3, 2013 - 11:26:42 AM
Last modification on : Wednesday, October 14, 2020 - 4:12:50 AM
Long-term archiving on: : Friday, October 4, 2013 - 4:07:42 AM

File

Pantale_6649.pdf
Publisher files allowed on an open archive

Identifiers

  • HAL Id : insu-00840808, version 1

Citation

Philippe Stempflé, Xavier Bourrat, Richard Kouitat Njiwa, Olivier Pantalé, Evelyne Lopez, et al.. A multiscale tribological study of nacre : Evidence of wear nanomechanisms controlled by the frictional dissipated power. 15th Nordic Symposium on Tribology, Jun 2012, Trondheim, Norway. pp.1-10. ⟨insu-00840808⟩

Share

Metrics

Record views

371

Files downloads

204