Abstract
The critical energy release rate of human bone was determined for different crack propagation directions with three-point-bending tests using controlled crack extension. The local structure was characterised by small-angle X-ray scattering, SEM and polarised light microscopy and related to the energy required for crack extension. It turns out the collagen angle is decisive for switching the fracture behaviour of bone from brittle to quasi-ductile. A significant increase in the critical energy release rate as well as a change of the appearance of the crack path from straight and smooth to deflected and zig-zag is observed.
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Peterlik, H., Roschger, P., Klaushofer, K. et al. Orientation dependent fracture toughness of lamellar bone. Int J Fract 139, 395–405 (2006). https://doi.org/10.1007/s10704-006-6634-z
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DOI: https://doi.org/10.1007/s10704-006-6634-z