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Effects of growth on residual stress distribution along the radial depth of cortical cylinders from bovine femurs.

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Title: Effects of growth on residual stress distribution along the radial depth of cortical cylinders from bovine femurs.
Authors: Yamada, Satoshi Browse this author →KAKEN DB
Tadano, Shigeru Browse this author →KAKEN DB
Keywords: Bone
Biomechanics
X-ray diffraction
Growth effect
Residual stress
Issue Date: 3-Sep-2013
Publisher: Elsevier
Journal Title: Journal of biomechanics
Volume: 46
Issue: 13
Start Page: 2130
End Page: 2136
Publisher DOI: 10.1016/j.jbiomech.2013.07.002
PMID: 23895894
Abstract: Residual stress is defined as the stress that remains in bone tissue without any external forces. This study investigated the effects of growth on residual stress distributions from the surface to deeper regions of cortical cylinders obtained from less-than-one-month-old (Group Y) and two-year-old (Group M) bovine femurs. In these experiments, five diaphysis specimens from each group were used. Residual stress was measured using a high-energy synchrotron white X-ray beam to penetrate X-rays into the deeper region of the bone specimens. The measurements in the cortical cylinders from Groups Y and M were performed at 0.5- and 1-mm intervals, respectively, from the outer surface to the deeper region of the diaphysis specimens at four positions: anterior, posterior, lateral, and medial. The residual stress was calculated on the basis of variation in the interplanar spacing of hydroxyapatite crystals in the bone tissue. According to the results, the diaphysis specimens from Group Y were not subjected to large residual stresses (average −1.2 MPa and 2.4 MPa at the surface region and 1.5 mm depth, respectively). In Group M, the surface region of the diaphysis specimens was subjected to tensile residual stresses (average 6.7 MPa) and the deeper region was subjected to compressive stresses (average −8.2 MPa at 3 mm depth). There was a strong significant difference between both these regions. The value of residual stresses at the surface region of the diaphysis specimens in both the groups had a positive statistical correlation with the cortical thickness at the measured locations.
Type: article (author version)
URI: http://hdl.handle.net/2115/53104
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 但野 茂

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