Hydroxyapatite-Sheet Parallel Microstructure of Shinbone
Bone is a natural biomaterial. It behaves favorable strength, stiffness and fracture toughness, which are closely related to its eximious microstructure. Scanning Electron Microscope (SEM) observation on a shinbone showed that the bone is a bioceramic composite consisting of laminated hydroxyapatite and collagen matrix. The hydroxyapatite layers are parallel with the surface of the bone and consist of long and thin hydroxyapatite sheets. The observation also showed that the hydroxyapatite sheets in different hydroxyapatite layers also parallel with each other, which composes a hydroxyapatite-sheet parallel microstructure. The maximum pullout energy of the parallel microstructure was investigated based on its representative model. It was shown that the long and thin shape of the hydroxyapatite sheets in the parallel microstructure is profitable to increase the maximum pullout energy and enhance the fracture toughness of the bone.
Keywordsshinbone hydroxyapatite sheets parallel microstructure maximum pullout energy fracture toughness
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- Vincent J F V. Ceramics from invertebrate animals. In: Levy M, Bass H, Stern R (eds), Handbook of Elastic Properties of Solids, Liquids and Gases, vol 3, Academic Press, Burlington, USA, 2000.Google Scholar
- Weber M, Schoeberl T, Roschger P, Klaushofer K, Fratzl P. Relating local bone stiffness and calcium content by combined nanoindentation and backscattered electron imaging. MRS Proceedings: Structure and Mechanical Behavior of Biological Materials, 2005, 847, 79–84.Google Scholar
- Glimcher M J. The nature of the mineral component of bone and the mechanisms of calcification. In: Coe F L, Favus M J (eds), Disorders of Bone and Mineral Metabolism, Raven Press, New York, USA, 1992, 265–286.Google Scholar