Bone and Bone Surrogate Fragmentation Under Dynamic Compression
The rate-dependent compressive response and resulting fragmentation characteristics of dry ox cortical bone and cyanoacrylate-based cortical bone surrogate material was investigated in two material orientations. Tests were conducted under quasi-static (10 −3 s −1 ) and dynamic (10 3 s −1 ) loading...
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Veröffentlicht in: | Journal of dynamic behavior of materials 2016-06, Vol.2 (2), p.234-245 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The rate-dependent compressive response and resulting fragmentation characteristics of dry ox cortical bone and cyanoacrylate-based cortical bone surrogate material was investigated in two material orientations. Tests were conducted under quasi-static (10
−3
s
−1
) and dynamic (10
3
s
−1
) loading in the longitudinal and transverse direction with respect to the osteon and die-press orientation. The fragments resulting from dynamic loading were analyzed by fitting 2D ellipses of representative distributions using post-mortem optical microscopy, and are related to existing flaws in the microstructure and the energetics of dynamic fracture evolution. The compressive strength of the bone surrogate increases 20–27 % (±7 %) from quasi-static to dynamic when loaded in either the longitudinal or transverse orientation, while the compressive strength of the ox bone increased 43–66 % (±9 %). Resulting bone fragments had a mean size of 266 ± 28 μm for longitudinal and 410 ± 19 μm for transverse loading, while the bone surrogate produced larger fragments with mean sizes of 431 ± 14 μm for longitudinal and 694 ± 25 μm for transverse. Fragment size distributions exhibit a power-law dependence on length, as the onset of fracture asymptotes to a range of length scales where the fragmentation is self-similar and fractal. Pre- and post-mortem scanning electron microscopy reveals that the bone surrogate has pre-existing flaws of pores and microcracks in a nominally homogeneous microstructure which resulted in a larger characteristic fragmentation length, whereas the ox bone has an inherently anisotropic composition that resulted in fragments linked to microstructural features of the internal canal system. |
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ISSN: | 2199-7446 2199-7454 |
DOI: | 10.1007/s40870-016-0061-7 |