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Damage rate is a predictor of fatigue life and creep strain rate in fatigue of tensile cortical bone samples

Cotton, John R., Winwood, Keith, Zioupos, Peter and Taylor, Mark (2005) Damage rate is a predictor of fatigue life and creep strain rate in fatigue of tensile cortical bone samples Journal of Biomechanical Engineering, 127, (2), pp. 213-219. (doi:10.1115/1.1865188).

Record type: Article

Abstract

We present results on the growth of damage in 29 fatigue tests of human femoral cortical bone from four individuals, aged 53–79. In these tests we examine the interdependency of stress, cycles to failure, rate of creep strain, and rate of modulus loss. The behavior of creep rates has been reported recently for the same donors as an effect of stress and cycles (Cotton, J. R., Zioupos, P., Winwood, K., and Taylor, M., 2003, "Analysis of Creep Strain During Tensile Fatigue of Cortical Bone," J. Biomech. 36, pp. 943–949). In the present paper we first examine how the evolution of damage (drop in modulus per cycle) is associated with the stress level or the "normalized stress" level (stress divided by specimen modulus), and results show the rate of modulus loss fits better as a function of normalized stress. However, we find here that even better correlations can be established between either the cycles to failure or creep rates versus rates of damage than any of these three measures versus normalized stress. The data indicate that damage rates can be excellent predictors of fatigue life and creep strain rates in tensile fatigue of human cortical bone for use in practical problems and computer simulations.

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Published date: 2005

Identifiers

Local EPrints ID: 23420
URI: http://eprints.soton.ac.uk/id/eprint/23420
ISSN: 0148-0731
PURE UUID: 9f1ab62c-341d-42d1-9863-5f48c143cb01

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Date deposited: 13 Mar 2006
Last modified: 17 Jul 2017 16:17

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Contributors

Author: John R. Cotton
Author: Keith Winwood
Author: Peter Zioupos
Author: Mark Taylor

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