Fatigue Crack Growth Rates in Equine Cortical Bone
نویسندگان
چکیده
INTRODUCTION Stress fractures are common in athletes, military recruits, and Thoroughbred racehorses, and may occur as hip fractures in the elderly. All of these injuries, to some extent, depend upon the propagation of fatigue cracks. Therefore, it is important to characterize the rates at which fatigue cracks grow and how microstructural differences found in cortical bone influence the crack growth rate. Mechanical and fatigue properties of equine third metacarpal (cannon) bone have been shown to vary with cortical region. Bend specimens taken from the lateral region were stronger and stiffer than those taken from the dorsal region under monotonic loading. However, dorsal specimens had a longer fatigue life (Gibson, et al., 1995). These results suggested that crack growth rates in different cortical regions might also differ.
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