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Type: Journal article
Title: Effects of fatigue induced damage on the longitudinal fracture resistance of cortical bone
Author: Fletcher, L.
Codrington, J.
Parkinson, I.
Citation: Journal of Materials Science: Materials in Medicine, 2014; 25(7):1661-1670
Publisher: Springer
Issue Date: 2014
ISSN: 0957-4530
Statement of
Lloyd Fletcher, John Codrington, Ian Parkinson
Abstract: As a composite material, cortical bone accumulates fatigue microdamage through the repetitive loading of everyday activity (e.g. walking). The accumulation of fatigue microdamage is thought to contribute to the occurrence of fragility fractures in older people. Therefore it is beneficial to understand the relationship between microcrack accumulation and the fracture resistance of cortical bone. Twenty longitudinally orientated compact tension fracture specimens were machined from a single bovine femur, ten specimens were assigned to both the control and fatigue damaged groups. The damaged group underwent a fatigue loading protocol to induce microdamage which was assessed via fluorescent microscopy. Following fatigue loading, non-linear fracture resistance tests were undertaken on both the control and damaged groups using the J-integral method. The interaction of the crack path with the fatigue induced damage and inherent toughening mechanisms were then observed using fluorescent microscopy. The results of this study show that fatigue induced damage reduces the initiation toughness of cortical bone and the growth toughness within the damage zone by three distinct mechanisms of fatigue–fracture interaction. Further analysis of the J-integral fracture resistance showed both the elastic and plastic component were reduced in the damaged group. For the elastic component this was attributed to a decreased number of ligament bridges in the crack wake while for the plastic component this was attributed to the presence of pre-existing fatigue microcracks preventing energy absorption by the formation of new microcracks.
Keywords: Bone and Bones
Fractures, Stress
Microscopy, Fluorescence
Stress, Mechanical
Fractures, Bone
Biomechanical Phenomena
Rights: © Springer Science+Business Media New York 2014
DOI: 10.1007/s10856-014-5213-5
Appears in Collections:Aurora harvest 3
Mechanical Engineering publications

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