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Analysis of creep strain during tensile fatigue of cortical bone

Analysis of creep strain during tensile fatigue of cortical bone
Analysis of creep strain during tensile fatigue of cortical bone
During fatigue tests of cortical bone specimens, at the unload portion of the cycle (zero stress) non-zero strains occur and progressively accumulate as the test progresses. This non-zero strain is hypothesised to be mostly, if not entirely, describable as creep. This work examines the rate of accumulation of this strain and quantifies its stress dependency. A published relationship determined from creep tests of cortical bone (Journal of Biomechanics 21 (1988) 623) is combined with knowledge of the stress history during fatigue testing to derive an expression for the amount of creep strain in fatigue tests. Fatigue tests on 31 bone samples from four individuals showed strong correlations between creep strain rate and both stress and "normalised stress" (?/E) during tensile fatigue testing (0–T). Combined results were good (r^2=0.78) and differences between the various individuals, in particular, vanished when effects were examined against normalised stress values. Constants of the regression showed equivalence to constants derived in creep tests. The universality of the results, with respect to four different individuals of both sexes, shows great promise for use in computational models of fatigue in bone structures.
human cortical bone, creep, fatigue, damage accumulation
0021-9290
943-949
Cotton, John R.
2d8cc775-4794-478e-834d-01f8b8051417
Zioupos, Peter
70120765-7396-4e86-bb9e-9c4d64c43294
Winwood, Keith
caff2698-6503-4bdf-beab-20b4bc82f214
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb
Cotton, John R.
2d8cc775-4794-478e-834d-01f8b8051417
Zioupos, Peter
70120765-7396-4e86-bb9e-9c4d64c43294
Winwood, Keith
caff2698-6503-4bdf-beab-20b4bc82f214
Taylor, Mark
e368bda3-6ca5-4178-80e9-41a689badeeb

Cotton, John R., Zioupos, Peter, Winwood, Keith and Taylor, Mark (2003) Analysis of creep strain during tensile fatigue of cortical bone. Journal of Biomechanics, 36 (7), 943-949. (doi:10.1016/S0021-9290(03)00063-0).

Record type: Article

Abstract

During fatigue tests of cortical bone specimens, at the unload portion of the cycle (zero stress) non-zero strains occur and progressively accumulate as the test progresses. This non-zero strain is hypothesised to be mostly, if not entirely, describable as creep. This work examines the rate of accumulation of this strain and quantifies its stress dependency. A published relationship determined from creep tests of cortical bone (Journal of Biomechanics 21 (1988) 623) is combined with knowledge of the stress history during fatigue testing to derive an expression for the amount of creep strain in fatigue tests. Fatigue tests on 31 bone samples from four individuals showed strong correlations between creep strain rate and both stress and "normalised stress" (?/E) during tensile fatigue testing (0–T). Combined results were good (r^2=0.78) and differences between the various individuals, in particular, vanished when effects were examined against normalised stress values. Constants of the regression showed equivalence to constants derived in creep tests. The universality of the results, with respect to four different individuals of both sexes, shows great promise for use in computational models of fatigue in bone structures.

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More information

Published date: 2003
Keywords: human cortical bone, creep, fatigue, damage accumulation

Identifiers

Local EPrints ID: 22546
URI: http://eprints.soton.ac.uk/id/eprint/22546
ISSN: 0021-9290
PURE UUID: aede95fe-e267-4e50-ab6c-457bac9ee0cc

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Date deposited: 24 Mar 2006
Last modified: 22 Jul 2022 20:27

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Contributors

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

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