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Indentation variability of natural nanocomposite materials

Published online by Cambridge University Press:  31 January 2011

Michelle L. Oyen  and
Ching-Chang Ko
Michelle L. Oyen*
Affiliation:
Cambridge University, Engineering Department, Cambridge CB2 1PZ, United Kingdom
Ching-Chang Ko
Affiliation:
Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina 27599-7450
*
a)Address all correspondence to this author. e-mail: mlo29@cam.ac.uk
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Abstract

Small-scale depth-sensing indentation (nanoindentation) is a popular technique for measuring the mechanical properties of a wide range of materials. Contact mechanics solutions used in data analysis are based on the indentation of a homogeneous half-space, but the experiments are frequently conducted on mineralized biological tissues—biocomposite materials with nanometer-scale features—such as bone and dentin. The current study examines the experimental indentation response of bone across orders of magnitude in contact dimension length-scale, from nanometers to micrometers. Scaling arguments are used to establish the need for nanoscale simulations of mineralized tissue indentation. A finite element model of an inhomogeneous contact problem is developed and used to interpret experimental indentation data on bone and dentin. Both experimental data and modeling results demonstrate a convergence in apparent elastic modulus at increasing contact length-scales. Models results are used to estimate a feature size associated with inhomogeneity of the indentation response; for experiments conducted here the characteristic feature size is found to be substantially larger for bone than for dentin, and in both cases larger than for individual nanometer-scale mineral platelets.

Keywords

Elastic propertiesBoneComposite

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Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 3 , March 2008 , pp. 760 - 767
Copyright
Copyright © Materials Research Society 2008

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