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Mechanisms of short crack growth at constant stress in bone

Paper ID Volume ID Publish Year Pages File Format Full-Text
10806 702 2006 9 PDF Available
Title
Mechanisms of short crack growth at constant stress in bone
Abstract

This paper describes an experimental study of the growth of small (i.e. sub-millimetre) cracks in samples of cortical bone subjected to a constant tensile stress. Slow, stable crack growth occurred at a rate and angle which were dependent on the orientation of the sample: tests were conducted with the loading axis both parallel and perpendicular to the longitudinal axis of the bone. All cracks showed intermittent growth in which periods of relatively rapid propagation alternated with periods of temporary crack arrest or relatively slow growth. In some cases crack arrest could be clearly linked to microstructural features such as osteons or Volkmann's canals, which acted as barriers to crack growth. Crack-opening displacement increased over time during the arrest periods. These observations suggest a mechanism for the growth of small cracks in bone at constant stress, involving microstructural barriers, time-dependent deformation of material near the crack tip and strain-controlled propagation.

Keywords
Microcracks; Cortical bone; Crack growth; Crack opening displacement; Fracture mechanics
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 27, Issue 9, March 2006, Pages 2114–2122
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
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