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Microindentation behavior of the shell of the conch Strombus gigas

Published online by Cambridge University Press:  02 July 2020

X. Su
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio44106-7204
D. Zhang
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio44106-7204
A.H. Heuer
Affiliation:
Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio44106-7204
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Abstract

Microindentation using a hard indentor is a very useful tool to probe the local mechanical properties (plastic flow, fracture, toughness, creep, etc.) of hard solids. We have used a depth sensitive indentation (DSI) version of this technique to study the shell of the conch Strombus gigas.In particular, we prepared polished sections in which the third order lamellae, the basic building block of the structure, could be indented along the three orthogonal directions; the indentation behavior along these three directions is quite different. Besides the normal information such as the hardness H from some typical dimension (typically the diameter of a pyramid-shaped indentation produced by a so-called Vickers diamond indenter) after indenting with a given load, the DSI technique also provides much additional information available from the loading and unloading curves. As can be seen from Fig. 1, the loading and unloading curves for the three orientations are quite different, as is the depth of the residual impression.

Type
Novel Microscopy Assisted Ceramic Developments in Materials Scienceand Nanotechnology (Organized by P. Gai and J. Lee)
Copyright
Copyright © Microscopy Society of America 2001

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