School of Materials, Manchester Materials Science Centre, The University of Manchester, Grosvenor Street, Manchester M1 7HS, UK.
Acta Biomater. 2011 Feb;7(2):716-23. doi: 10.1016/j.actbio.2010.10.007. Epub 2010 Oct 15.
Microdamage and failure mechanisms have been well characterized in bovine trabecular bone. However, little is known about how elastic strains develop in the apatite crystals of the trabecular struts and their relationship with different deformation mechanisms. In this study, wide-angle high-energy synchrotron X-ray diffraction has been used to determine bulk elastic strains under in situ compression. Dehydrated bone is compared to hydrated bone in terms of their response to load. During compression, load is initially borne by trabeculae aligned parallel to loading direction with non-parallel trabeculae deforming by bending. Ineffective load partitioning is noted in dehydrated bone whereas hydrated bone behaves like a plastically yielding foam.
在牛松质骨中，微损伤和失效机制已得到很好的描述。然而，对于松质骨小梁中磷灰石晶体中的弹性应变如何发展及其与不同变形机制的关系，人们知之甚少。在这项研究中，采用广角高能量同步加速器 X 射线衍射技术在原位压缩下测定整体弹性应变。比较了脱水骨和水合骨对载荷的响应。在压缩过程中，最初由与加载方向平行的小梁承担载荷，而不平行的小梁通过弯曲变形。在脱水骨中观察到无效的载荷分配，而水合骨表现得像塑性屈服的泡沫。
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