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Effect of torsional loading on compressive fatigue behaviour of trabecular bone

The present study reports the effects of combined torsional and compressive cyclic loading on trabecular bone in order to mimic true physiological conditions and thereby provides improved data that represents clinical and real life conditions. However, only compressive behaviour is evaluated in most...

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Main Authors:	Fatihhi, S. J., Abdul Rahim, Rabiatul Adibah, Harun, Muhamad Noor, Abdul Kadir, Mohammed Rafiq, Kamarul, T., Syahrom, Ardiyansyah
Format:	Article
Published:	Elsevier Ltd 2016
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/69308/ http://dx.doi.org/10.1016/j.jmbbm.2015.09.006
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spelling	my.utm.693082017-11-22T00:45:10Z http://eprints.utm.my/id/eprint/69308/ Effect of torsional loading on compressive fatigue behaviour of trabecular bone Fatihhi, S. J. Abdul Rahim, Rabiatul Adibah Harun, Muhamad Noor Abdul Kadir, Mohammed Rafiq Kamarul, T. Syahrom, Ardiyansyah TJ Mechanical engineering and machinery The present study reports the effects of combined torsional and compressive cyclic loading on trabecular bone in order to mimic true physiological conditions and thereby provides improved data that represents clinical and real life conditions. However, only compressive behaviour is evaluated in most previous studies of bone mechanics. From the monotonic evaluation, it is observed that lower stress is needed for the onset of microcrack in the sample under torsional loading, compared to the stress needed in compression. Trabecular bone samples were subjected to a combination of torsion and compression fatigue at different stress levels during which they were compared to compressive axial fatigue. The stress levels were determined by considering the monotonic strength at 25-50% for both compressive and shear stresses. Significant decrease in fatigue lifetime is observed in between samples of pure compression fatigue and those with superpositioned torsional loading (p<0.05). The reduction in fatigue lifetime became more evident at a high torsional stress level. In this case, the failure of the sample is said to be 'torsional dominant'. Fatigue behaviour of bovine trabecular bone begins with plastic deformation, followed by strain accumulation and modulus reduction. As the strain rate increases, more energy dissipates and the sample finally failed. Further, the analysis of fractograph revealed something on the trabeculae by bending in sample with superpositioned torsional loading. In conclusion, torsional loading decreases the quality of the trabecular properties in terms of stiffness, life and structural integrity. It is hoped that results from this study will improve the understanding of the behaviour of trabecular bone under combined fatigue and help to develop future assessments of trabecular failure. Elsevier Ltd 2016 Article PeerReviewed Fatihhi, S. J. and Abdul Rahim, Rabiatul Adibah and Harun, Muhamad Noor and Abdul Kadir, Mohammed Rafiq and Kamarul, T. and Syahrom, Ardiyansyah (2016) Effect of torsional loading on compressive fatigue behaviour of trabecular bone. Journal of the Mechanical Behavior of Biomedical Materials, 54 . pp. 21-32. ISSN 1751-6161 http://dx.doi.org/10.1016/j.jmbbm.2015.09.006 DOI:10.1016/j.jmbbm.2015.09.006
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Fatihhi, S. J. Abdul Rahim, Rabiatul Adibah Harun, Muhamad Noor Abdul Kadir, Mohammed Rafiq Kamarul, T. Syahrom, Ardiyansyah Effect of torsional loading on compressive fatigue behaviour of trabecular bone
description	The present study reports the effects of combined torsional and compressive cyclic loading on trabecular bone in order to mimic true physiological conditions and thereby provides improved data that represents clinical and real life conditions. However, only compressive behaviour is evaluated in most previous studies of bone mechanics. From the monotonic evaluation, it is observed that lower stress is needed for the onset of microcrack in the sample under torsional loading, compared to the stress needed in compression. Trabecular bone samples were subjected to a combination of torsion and compression fatigue at different stress levels during which they were compared to compressive axial fatigue. The stress levels were determined by considering the monotonic strength at 25-50% for both compressive and shear stresses. Significant decrease in fatigue lifetime is observed in between samples of pure compression fatigue and those with superpositioned torsional loading (p<0.05). The reduction in fatigue lifetime became more evident at a high torsional stress level. In this case, the failure of the sample is said to be 'torsional dominant'. Fatigue behaviour of bovine trabecular bone begins with plastic deformation, followed by strain accumulation and modulus reduction. As the strain rate increases, more energy dissipates and the sample finally failed. Further, the analysis of fractograph revealed something on the trabeculae by bending in sample with superpositioned torsional loading. In conclusion, torsional loading decreases the quality of the trabecular properties in terms of stiffness, life and structural integrity. It is hoped that results from this study will improve the understanding of the behaviour of trabecular bone under combined fatigue and help to develop future assessments of trabecular failure.
format	Article
author	Fatihhi, S. J. Abdul Rahim, Rabiatul Adibah Harun, Muhamad Noor Abdul Kadir, Mohammed Rafiq Kamarul, T. Syahrom, Ardiyansyah
author_facet	Fatihhi, S. J. Abdul Rahim, Rabiatul Adibah Harun, Muhamad Noor Abdul Kadir, Mohammed Rafiq Kamarul, T. Syahrom, Ardiyansyah
author_sort	Fatihhi, S. J.
title	Effect of torsional loading on compressive fatigue behaviour of trabecular bone
title_short	Effect of torsional loading on compressive fatigue behaviour of trabecular bone
title_full	Effect of torsional loading on compressive fatigue behaviour of trabecular bone
title_fullStr	Effect of torsional loading on compressive fatigue behaviour of trabecular bone
title_full_unstemmed	Effect of torsional loading on compressive fatigue behaviour of trabecular bone
title_sort	effect of torsional loading on compressive fatigue behaviour of trabecular bone
publisher	Elsevier Ltd
publishDate	2016
url	http://eprints.utm.my/id/eprint/69308/ http://dx.doi.org/10.1016/j.jmbbm.2015.09.006
_version_	1643656053811838976
score	13.211869

Effect of torsional loading on compressive fatigue behaviour of trabecular bone

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