Shahar R, Zaslansky P, Barak M, Friesem A A, Currey J D, Weiner S
Koret School of Veterinary Medicine, The Hebrew University of Jerusalem, P.O. Box 12, 76100 Rehorot, Israel.
J Biomech. 2007;40(2):252-64. doi: 10.1016/j.jbiomech.2006.01.021. Epub 2006 Mar 24.
Young's modulus and Poisson's ratios of 6mm-sized cubes of equine cortical bone were measured in compression using a micro-mechanical loading device. Surface displacements were determined by electronic speckle pattern-correlation interferometry. This method allows for non-destructive testing of very small samples in water. Analyses of standard materials showed that the method is accurate and precise for determining both Young's modulus and Poisson's ratio. Material properties were determined concurrently in three orthogonal anatomic directions (axial, radial and transverse). Young's modulus values were found to be anisotropic and consistent with values of equine cortical bone reported in the literature. Poisson's ratios were also found to be anisotropic, but lower than those previously reported. Poisson's ratios for the radial-transverse and transverse-radial directions were 0.15+/-0.02, for the axial-transverse and axial-radial directions 0.19+/-0.04, and for the transverse-axial and radial-axial direction 0.09+/-0.02 (mean+/-SD). Cubes located only millimetres apart had significantly different elastic properties, showing that significant spatial variation occurs in equine cortical bone.
使用微机械加载装置在压缩状态下测量了尺寸为6毫米的马皮质骨立方体的杨氏模量和泊松比。通过电子散斑图案相关干涉测量法确定表面位移。该方法允许对水中的非常小的样本进行无损检测。对标准材料的分析表明，该方法在确定杨氏模量和泊松比方面准确且精确。在三个正交的解剖方向（轴向、径向和横向）上同时测定材料特性。发现杨氏模量值具有各向异性，并且与文献中报道的马皮质骨的值一致。泊松比也被发现具有各向异性，但低于先前报道的值。径向 - 横向和横向 - 径向方向的泊松比为0.15±0.02，轴向 - 横向和轴向 - 径向方向为0.19±0.04，横向 - 轴向和径向 - 轴向方向为0.09±0.02（平均值±标准差）。仅相隔几毫米的立方体具有显著不同的弹性特性，表明马皮质骨中存在显著的空间变化。
