Propagation of surface fatigue cracks in human cortical bone

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)968-972
Journal / PublicationJournal of Biomechanics
Volume39
Issue number5
Online published23 May 2005
Publication statusPublished - 2006
Externally publishedYes

Abstract

An understanding of how fatigue cracks grow in bone is of importance as fatigue is thought to be the main cause of clinical stress fractures. This study presents new results on the fatigue-crack growth behavior of small surface cracks (∼75-1000 μm in size) in human cortical bone, and compares their growth rates with data from other published studies on the behavior of both surface cracks and many millimeter, through-thickness large cracks. Results are obtained with a cyclically loaded cantilever-beam geometry using optical microscopy to examine for crack growth after every 100-500 cycles. Based on the current and previous results, small fatigue cracks appear to become more resistant to fatigue-crack growth with crack extension, analogous to the way the fracture resistance of cortical bone increases with crack growth. Mechanistically, a theory attributing such behavior to the development of bridges in the wake of the crack with crack growth is presented. The existence of such bridges is directly confirmed using optical microscopy.

Research Area(s)

  • Bridging, Cortical bone, Fatigue-crack growth, Fracture, Small cracks

Citation Format(s)

Propagation of surface fatigue cracks in human cortical bone. / Kruzic, J.J.; Scott, J.A.; Nalla, R.K.; Ritchie, R.O.

In: Journal of Biomechanics, Vol. 39, No. 5, 2006, p. 968-972.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review