CUED Publications database

Variability of nanoindentation responses of bone and artificial bone-like composites

Oyen, ML and Ko, CC (2004) Variability of nanoindentation responses of bone and artificial bone-like composites. Advances in Bioengineering, BED. pp. 391-392. ISSN 0360-9960

Full text not available from this repository.

Abstract

Nanoindentation is a popular technique for measuring the intrinsic mechanical response of bone and has been used to measure a single-valued elastic modulus. However, bone is a composite material with 20-80 nm hydroxyapatite plates embedded in a collagen matrix, and modern instrumentation allows for measurements at these small length scales. The present study examines the indentation response of bone and artificial gelatin-apatite nanocomposite materials across three orders of magnitude of lengthscale, from nanometers to micrometers, to isolate the composite phase contributions to the overall response. The load-displacement responses were variable and deviated from the quadratic response of homogeneous materials at small depths. The distribution of apparent elastic modulus values narrowed substantially with increasing indentation load. Indentation of particulate nanocomposites was simulated using finite element analysis. Modeling results replicated the convergence in effective modulus seen in the experiments. It appears that the apatite particles are acting as the continuous ("matrix") phase in bone and nanocomposites. Copyright © 2004 by ASME.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Unnamed user with email sms67@cam.ac.uk
Date Deposited: 16 Jul 2015 14:10
Last Modified: 01 Aug 2015 23:41
DOI: