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Nonlinear viscoelastic characterization of bovine trabecular bone

The time-independent elastic properties of trabecular bone have been extensively investigated, and several stiffness–density relations have been proposed. Although it is recognized that trabecular bone exhibits time-dependent mechanical behaviour, a property of viscoelastic materials, the characteri...

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Autores principales: Manda, Krishnagoud, Wallace, Robert J., Xie, Shuqiao, Levrero-Florencio, Francesc, Pankaj, Pankaj
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5285425/
https://www.ncbi.nlm.nih.gov/pubmed/27440127
http://dx.doi.org/10.1007/s10237-016-0809-y
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author Manda, Krishnagoud
Wallace, Robert J.
Xie, Shuqiao
Levrero-Florencio, Francesc
Pankaj, Pankaj
author_facet Manda, Krishnagoud
Wallace, Robert J.
Xie, Shuqiao
Levrero-Florencio, Francesc
Pankaj, Pankaj
author_sort Manda, Krishnagoud
collection PubMed
description The time-independent elastic properties of trabecular bone have been extensively investigated, and several stiffness–density relations have been proposed. Although it is recognized that trabecular bone exhibits time-dependent mechanical behaviour, a property of viscoelastic materials, the characterization of this behaviour has received limited attention. The objective of the present study was to investigate the time-dependent behaviour of bovine trabecular bone through a series of compressive creep–recovery experiments and to identify its nonlinear constitutive viscoelastic material parameters. Uniaxial compressive creep and recovery experiments at multiple loads were performed on cylindrical bovine trabecular bone samples ([Formula: see text] ). Creep response was found to be significant and always comprised of recoverable and irrecoverable strains, even at low stress/strain levels. This response was also found to vary nonlinearly with applied stress. A systematic methodology was developed to separate recoverable (nonlinear viscoelastic) and irrecoverable (permanent) strains from the total experimental strain response. We found that Schapery’s nonlinear viscoelastic constitutive model describes the viscoelastic response of the trabecular bone, and parameters associated with this model were estimated from the multiple load creep–recovery (MLCR) experiments. Nonlinear viscoelastic recovery compliance was found to have a decreasing and then increasing trend with increasing stress level, indicating possible stiffening and softening behaviour of trabecular bone due to creep. The obtained parameters from MLCR tests, expressed as second-order polynomial functions of stress, showed a similar trend for all the samples, and also demonstrate stiffening–softening behaviour with increasing stress.
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spelling pubmed-52854252017-02-15 Nonlinear viscoelastic characterization of bovine trabecular bone Manda, Krishnagoud Wallace, Robert J. Xie, Shuqiao Levrero-Florencio, Francesc Pankaj, Pankaj Biomech Model Mechanobiol Original Paper The time-independent elastic properties of trabecular bone have been extensively investigated, and several stiffness–density relations have been proposed. Although it is recognized that trabecular bone exhibits time-dependent mechanical behaviour, a property of viscoelastic materials, the characterization of this behaviour has received limited attention. The objective of the present study was to investigate the time-dependent behaviour of bovine trabecular bone through a series of compressive creep–recovery experiments and to identify its nonlinear constitutive viscoelastic material parameters. Uniaxial compressive creep and recovery experiments at multiple loads were performed on cylindrical bovine trabecular bone samples ([Formula: see text] ). Creep response was found to be significant and always comprised of recoverable and irrecoverable strains, even at low stress/strain levels. This response was also found to vary nonlinearly with applied stress. A systematic methodology was developed to separate recoverable (nonlinear viscoelastic) and irrecoverable (permanent) strains from the total experimental strain response. We found that Schapery’s nonlinear viscoelastic constitutive model describes the viscoelastic response of the trabecular bone, and parameters associated with this model were estimated from the multiple load creep–recovery (MLCR) experiments. Nonlinear viscoelastic recovery compliance was found to have a decreasing and then increasing trend with increasing stress level, indicating possible stiffening and softening behaviour of trabecular bone due to creep. The obtained parameters from MLCR tests, expressed as second-order polynomial functions of stress, showed a similar trend for all the samples, and also demonstrate stiffening–softening behaviour with increasing stress. Springer Berlin Heidelberg 2016-07-20 2017 /pmc/articles/PMC5285425/ /pubmed/27440127 http://dx.doi.org/10.1007/s10237-016-0809-y Text en © The Author(s) 2016 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Original Paper
Manda, Krishnagoud
Wallace, Robert J.
Xie, Shuqiao
Levrero-Florencio, Francesc
Pankaj, Pankaj
Nonlinear viscoelastic characterization of bovine trabecular bone
title Nonlinear viscoelastic characterization of bovine trabecular bone
title_full Nonlinear viscoelastic characterization of bovine trabecular bone
title_fullStr Nonlinear viscoelastic characterization of bovine trabecular bone
title_full_unstemmed Nonlinear viscoelastic characterization of bovine trabecular bone
title_short Nonlinear viscoelastic characterization of bovine trabecular bone
title_sort nonlinear viscoelastic characterization of bovine trabecular bone
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5285425/
https://www.ncbi.nlm.nih.gov/pubmed/27440127
http://dx.doi.org/10.1007/s10237-016-0809-y
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