Effect of microstructure on micromechanical performance of dry cortical bone tissues

Yin, Ling, Venkatesan, Sudharshan, Kalyanasundaram, Shankar, and Qin, Qing-Hua (2009) Effect of microstructure on micromechanical performance of dry cortical bone tissues. Materials Characterization, 60 (12). pp. 1424-1431.

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Abstract

The mechanical properties of bone depend on composition and structure. Previous studies have focused on macroscopic fracture behavior of bone. In the present study, we performed microindentation studies to understand the deformation properties and microcrack–microstructure interactions of dry cortical bone. Dry cortical bone tissues from lamb femurs were tested using Vickers indentation with loads of 0.245–9.8 N. We examined the effect of bone microstructure on deformation and crack propagation using scanning electron microscopy (SEM). The results showed the significant effect of cortical bone microstructure on indentation deformation and microcrack propagation. The indentation deformation of the dry cortical bone was basically plastic at any applied load with a pronounced viscoelastic recovery, in particular at lower loads. More microcracks up to a length of approximately 20 μm occurred when the applied load was increased. At loads of 4.9 N and higher, most microcracks were found to develop from the boundaries of haversian canals, osteocyte lacunae and canaliculi. Some microcracks propagated from the parallel direction of the longitudinal interstitial lamellae. At loads 0.45 N and lower, no visible microcracks were observed.

Item ID: 11180
Item Type: Article (Refereed Research - C1)
Keywords: dry cortical bone; deformation; microstructure; microcracks; microindentation
ISSN: 1873-4189
Date Deposited: 28 May 2010 02:03
FoR Codes: 09 ENGINEERING > 0903 Biomedical Engineering > 090301 Biomaterials @ 50%
09 ENGINEERING > 0903 Biomedical Engineering > 090302 Biomechanical Engineering @ 50%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 50%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920499 Public Health (excl. Specific Population Health) not elsewhere classified @ 50%
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