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Model for the robust mechanical behavior of nacre

Published online by Cambridge University Press:  31 January 2011

A. G. Evans ,
Z. Suo ,
R. Z. Wang ,
I. A. Aksay ,
M. Y. He  and
J. W. Hutchinson
A. G. Evans
Affiliation:
Department of Mechanical and Aerospace Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
Z. Suo
Affiliation:
Department of Mechanical and Aerospace Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
R. Z. Wang
Affiliation:
Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
I. A. Aksay
Affiliation:
Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
M. Y. He
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106
J. W. Hutchinson
Affiliation:
Division of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138
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Abstract

The inelastic deformation of nacre that leads to its structural robustness has been characterized in a recent experimental study. This article develops a model for the inelastic behavior, measured in tension, along the axis of the aragonite plates. The model is based on observations for abalone nacre that the inelasticity is associated with periodic dilatation bands. These bands contain coordinated separations at the periphery of the plates. The separations open as the material strains. The response is attributed to nanoscale asperities on the surfaces of the plates. The model calculates the stresses needed to displace the plates, resisted by elastic contacts at the asperities. The results are compared with the measured stress/strain curves.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 9 , September 2001 , pp. 2475 - 2484
Copyright
Copyright © Materials Research Society 2001

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