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首页> 外文期刊>Acta biomaterialia >Elastic strains in antler trabecular bone determined by synchrotron X-ray diffraction.
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Elastic strains in antler trabecular bone determined by synchrotron X-ray diffraction.

机译：通过同步加速器X射线衍射确定鹿角小梁骨中的弹性应变。

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摘要

The microstructure and associated mechanical properties of antler trabecular bone have been studied using a variety of techniques. The local trabeculae properties, as well as the three-dimensional architecture were characterized using nanoindentation and X-ray microtomography, respectively. An elastic modulus of 10.9+/-1.1 GPa is reported for dry bone, compared with 5.4+/-0.9 GPa for fully hydrated bone. Trabeculae thickness and separation were found to be comparable to those of bovine trabecular bone. Uniaxial compression conducted in situ during X-ray microtomography showed that antler can undergo significant architectural rearrangement, dominated by trabeculae bending and buckling, due to its low mineral content. High-energy synchrotron X-ray diffraction was used to measure elastic strains in the apatite crystals of the trabeculae, also under in situ uniaxial compression. During elastic loading, strain was found to be accommodated largely by trabeculae aligned parallel to the loading direction. Prior to the macroscopic yield point, internal strains increased as trabeculae deformed by bending, and load was also found to be redistributed to trabeculae aligned non-parallel to the loading direction. Significant bending of trabecular walls resulted in tensile strains developing in trabeculae aligned along the loading direction.
机译：鹿角小梁骨的微观结构和相关的机械性能已使用多种技术进行了研究。分别使用纳米压痕和X射线显微断层扫描来表征局部小梁的性质以及三维结构。据报告，干骨的弹性模量为10.9 +/- 1.1 GPa，而完全水合的骨的弹性模量为5.4 +/- 0.9 GPa。发现小梁的厚度和分离度与牛小梁骨相当。在X射线显微照相术中原位进行的单轴压缩显示，鹿角由于其矿物质含量低，可能会受到小梁弯曲和屈曲的影响而发生重大的建筑重排。高能同步加速器X射线衍射也用于在原位单轴压缩下测量小梁的磷灰石晶体中的弹性应变。在弹性加载过程中，发现平行于加载方向排列的小梁在很大程度上吸收了应变。在宏观屈服点之前，随着小梁弯曲变形，内部应变增加，并且还发现载荷被重新分配到与载荷方向不平行排列的小梁。小梁壁的显着弯曲导致沿加载方向排列的小梁中产生拉伸应变。

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