Biomedical Engineering Reference
In-Depth Information
Fig. 3.2.9-14 The smooth part of a 316L stainless steel Harrington spinal distraction rod that fractured by fatigue in vivo. Note the bend
inthe rod (the rod was originally straight) and (insert) the relationship of the crack initiation zone of the fracture surface to the bend. The
inserted photo shows the nature of the fatigue fracture surface, which is characterized by a region of ''beach marks'' and a region of
sudden overload failure. (Photo courtesy of J. B. Brunski, D. C. Hill, and A. Moskowitz, 1983. Stresses in a Harrington distraction rod: their
origin and relationship to fatigue fractures in vivo. J. Biomech. Eng.105: 101-107.)
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