Deconvolution of the elastic properties of bivalve shell nanocomposites from direct measurement and finite element analysis

O’Toole-Howes, Matthias and Ingleby, Ruth and Mertesdorf, Melanie and Dean, James and Li, Wei and Carpenter, Michael A. and Harper, Elizabeth M. (2019) Deconvolution of the elastic properties of bivalve shell nanocomposites from direct measurement and finite element analysis. Journal of Materials Research, 34 (16). pp. 2869-2880. ISSN 0884-2914 DOI https://doi.org/10.1557/jmr.2019.159

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Official URL: https://doi.org/10.1557/jmr.2019.159

Abstract

A new protocol has been devised for determining elastic properties of natural biocomposites in the form of bivalve shells under wet and dry conditions. Four-point bending on shell slices of Mytilus edulis, Ensis siliqua, and Pecten maximus give generally lower and more reliable values of Young’s modulus, E, than those in the literature from three-point bending, due to the more even distribution of strain. Finite element analysis of the prismatic microstructure of Pinna nobilis, obtained by X-ray tomography, shows that values of E ≈ 20 GPa can be understood in terms of the real microstructure containing a small proportion of organic matrix phase with E ≈ 1 GPa and a dominant proportion of calcite with E ≈ 90 GPa. Higher values of E obtained by nanoindentation give results which are biased toward the properties of the carbonate phase rather than of the biocomposite as a whole.

Item Type: Article
Uncontrolled Keywords: 2019AREP; IA76
Subjects: 03 - Mineral Sciences
04 - Palaeobiology
06 - Part-III Projects
Divisions: 03 - Mineral Sciences
04 - Palaeobiology
06 - Part-III Projects
Journal or Publication Title: Journal of Materials Research
Volume: 34
Page Range: pp. 2869-2880
Identification Number: https://doi.org/10.1557/jmr.2019.159
Depositing User: Sarah Humbert
Date Deposited: 30 Mar 2020 16:27
Last Modified: 30 Mar 2020 16:27
URI: http://eprints.esc.cam.ac.uk/id/eprint/4658

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