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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April 2005
Technical Papers
Damage Rate is a Predictor of Fatigue Life and Creep Strain Rate in Tensile Fatigue of Human Cortical Bone Samples
John R. Cotton,
John R. Cotton
Department of Engineering Science and Mechanics and Virginia Tech–Wake Forest School of Biomedical Engineering and Science
, Virginia Tech, Mail code 0219, Blacksburg, VA 24061
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Keith Winwood,
Keith Winwood
Institute for Biophysical and Clinical Research into Human Movement
, Manchester Metropolitian University, Alsager, UK
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Peter Zioupos,
Peter Zioupos
Center for Materials Science and Engineering
, Cranfield Postgraduate Medical School, Cranfield University, Shrivenham, UK
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Mark Taylor
Mark Taylor
Bioengineering Science Research Group
, School of Engineering Science, University of Southampton, Southampton, UK
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John R. Cotton
Department of Engineering Science and Mechanics and Virginia Tech–Wake Forest School of Biomedical Engineering and Science
, Virginia Tech, Mail code 0219, Blacksburg, VA 24061
Keith Winwood
Institute for Biophysical and Clinical Research into Human Movement
, Manchester Metropolitian University, Alsager, UK
Peter Zioupos
Center for Materials Science and Engineering
, Cranfield Postgraduate Medical School, Cranfield University, Shrivenham, UK
Mark Taylor
Bioengineering Science Research Group
, School of Engineering Science, University of Southampton, Southampton, UKJ Biomech Eng. Apr 2005, 127(2): 213-219 (7 pages)
Published Online: September 28, 2004
Article history
Received:
August 7, 2003
Revised:
September 28, 2004
Citation
Cotton, J. R., Winwood, K., Zioupos, P., and Taylor, M. (September 28, 2004). "Damage Rate is a Predictor of Fatigue Life and Creep Strain Rate in Tensile Fatigue of Human Cortical Bone Samples." ASME. J Biomech Eng. April 2005; 127(2): 213–219. https://doi.org/10.1115/1.1865188
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