The significance of crack-resistance curves to the mixed-mode fracture toughness of human cortical bone

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The majority of fracture mechanics studies on the toughness of bone have been performed under tensile loading. However, it has recently been shown that the toughness of human cortical bone in the transverse (breaking) orientation is actually much lower in shear (mode II) than in tension (mode I); a fact that is physiologically relevant as in vivo bone is invariably loaded multiaxially. Since bone is a material that derives its fracture resistance primarily during crack growth through extrinsic toughening mechanisms, such as crack deflection and bridging, evaluation of its toughness is best achieved through measurements of the crack-resistance or R-curve, ... continued below

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Zimmermann, Elizabeth A.; Launey, Maximilien E. & Ritchie, Robert O. March 25, 2010.

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The majority of fracture mechanics studies on the toughness of bone have been performed under tensile loading. However, it has recently been shown that the toughness of human cortical bone in the transverse (breaking) orientation is actually much lower in shear (mode II) than in tension (mode I); a fact that is physiologically relevant as in vivo bone is invariably loaded multiaxially. Since bone is a material that derives its fracture resistance primarily during crack growth through extrinsic toughening mechanisms, such as crack deflection and bridging, evaluation of its toughness is best achieved through measurements of the crack-resistance or R-curve, which describes the fracture toughness as a function of crack extension. Accordingly, in this study, we attempt to measure for the first time the R-curve fracture toughness of human cortical bone under physiologically relevant mixed-mode loading conditions. We show that the resulting mixed-mode (mode I + II) toughness depends strongly on the crack trajectory and is the result of the competition between the paths of maximum mechanical driving force and 'weakest' microstructural resistance.

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5297

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  • Journal Name: Biomaterials; Journal Volume: 31; Journal Issue: 20

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  • Report No.: LBNL-3190E
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/j.biomaterials.2010.03.056 | External Link
  • Office of Scientific & Technical Information Report Number: 984733
  • Archival Resource Key: ark:/67531/metadc1013162

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • March 25, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 18, 2017, 10:11 a.m.

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Zimmermann, Elizabeth A.; Launey, Maximilien E. & Ritchie, Robert O. The significance of crack-resistance curves to the mixed-mode fracture toughness of human cortical bone, article, March 25, 2010; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1013162/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.