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Effects of fatigue induced damage on the longitudinal fracture resistance of cortical bone
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Effects of fatigue induced damage on the longitudinal fracture resistance of cortical bone
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Effects of fatigue induced damage on the longitudinal fracture resistance of cortical bone
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Journal Article
Effects of fatigue induced damage on the longitudinal fracture resistance of cortical bone
2014
Overview
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.
Publisher
Springer US,Springer,Springer Nature B.V
Subject
/ Biological and medical sciences
/ Biomedical Engineering and Bioengineering
/ Bones
/ Cattle
/ Ceramics
/ Chemistry and Materials Science
/ Cracks
/ Femur
/ Fractures, Stress - pathology
/ Glass
/ Regenerative Medicine/Tissue Engineering
/ Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
