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Prediction of cross section fracture path of cortical bone through nanoindentation array
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2021-01-20 , DOI: 10.1016/j.jmbbm.2020.104303
Zhichao Ma , Zhenfeng Qiang , Kaiyang Zeng , Jianlin Xiao , Liming Zhou , Lihui Zu , Hongwei Zhao , Luquan Ren

Although great progresses in the fracture mechanisms and deformation behaviors of cortical bones have been achieved, the effective methods to predict the surface fracture path of cortical bones are still difficult. By using depth-sensing nanoindentation measurement technique, the hardness distribution map of cortical bones was obtained through nanoindentation array. Combined with the compressive tests under approximate in vivo environment and micro computed tomography (CT) analysis, the correlation between hardness distribution map and compressive fracture path on the cross section of cortical bone was established. Through extracting the high hardness regions from the hardness distribution map and connecting the high hardness regions combined with the minimum directional derivative principle, the fracture path on cross section under compressive stress was accurately predicted. The feasibility of the prediction method was verified through the comparison between the fitted and actual fracture paths of specimens with sampling orientations of 90° and 45°. The relation between the regions where the fracture propagation path passed through and distribution of Haversian canals were also analyzed.



中文翻译:

通过纳米压痕阵列预测皮质骨的横截面断裂路径

尽管皮质骨的断裂机制和变形行为已经取得了很大的进步,但是预测皮质骨表面断裂路径的有效方法仍然很困难。利用深度传感纳米压痕测量技术,通过纳米压痕阵列获得了皮质骨的硬度分布图。结合在近似体内环境下的压缩试验和显微计算机断层扫描(CT)分析,建立了硬度分布图与皮质骨截面上压缩性骨折路径的相关性。通过从硬度分布图中提取高硬度区域并结合最小方向导数原理连接高硬度区域,准确预测了压应力作用下的断口断裂路径。通过比较取样方向为90°和45°的试样的拟合路径与实际断裂路径,验证了该预测方法的可行性。还分析了裂缝传播路径通过的区域与哈弗斯运河分布之间的关系。

更新日期:2021-01-24
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