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Summary: Deformation mechanisms in nacre
R.Z. Wang
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544
Z. Suo and A.G. Evans
Department of Mechanical and Aerospace Engineering and Princeton Materials Institute, Princeton
University, Princeton, New Jersey 08544
N. Yao
Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
I.A. Aksay
Department of Chemical Engineering and Princeton Materials Institute, Princeton University,
Princeton, New Jersey 08544
(Received 27 December 2000; accepted 4 June 2001)
Nacre (mother-of-pearl) from mollusc shells is a biologically formed lamellar ceramic.
The inelastic deformation of this material has been experimentally examined, with a
focus on understanding the underlying mechanisms. Slip along the lamellae tablet
interface has been ascertained by testing in compression with the boundaries oriented
at 45° to the loading axis. The steady-state shear resistance ss has been determined
and inelastic strain shown to be as high as 8%. The inelastic deformation was realized
by massive interlamellae shearing. Testing in tension parallel to the tablets indicates
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