Analyzing the effect of hydration on the wedge indentation fracture behavior of cortical bone
Analyzing the effect of hydration on the wedge indentation fracture behavior of cortical bone
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DOI：
10.1016/j.jmbbm.2017.01.001
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发表时间：
2017-05-01
影响因子：
3.9
通讯作者：
Yang, Henry T. Y.
中科院分区：
文献类型：
--
作者：
Hoffseth, Kevin;Randall, Connor;Yang, Henry T. Y.
水合作用直接影响骨骼的力学性能。一个初始的和基本的程序表明，在平面应变条件下，在皮质骨的楔形压痕骨折实验和数值模拟与有限元同意，干骨骨折更容易比完全水合骨淹没在水性环境中，如在动物的身体。在干燥和完全水合（浸没）条件下，用高速视频显微镜进行楔形压痕实验。采用数值模拟方法，特别是有限元分析方法，利用粘结单元模拟断裂过程，研究了脆性材料压痕断裂理论的适用性。实验和理论给出了相似的结果，裂纹萌生的深度，和塑性区的大小，水化状态的依赖关系。湿骨和干骨之间的骨折扩展特性的比较进行了检查和讨论。这项研究表明，能够定量评估水化对骨折的发生，传播和塑性区大小的皮质骨的影响，通过一种方法，使用简单的楔形压痕，具有重要意义的努力，在开发方法，以了解临床诊断测试和一般骨折行为的活骨的最终利益的医疗保健目的。
Hydration directly affects the mechanical properties of bone. An initial and basic procedure shows both wedge indentation fracture experiments under plane strain conditions in cortical bone and numerical simulation with finite elements agree that dry bone fractures much more easily than fully hydrated bone submerged in an aqueous environment, such as in the body of an animal. The wedge indentation experiments were performed with high speed video microscopy, under dry and fully hydrated (submerged) conditions. The numerical simulation, specifically finite element analysis using cohesive elements to simulate fracture, was utilized to capture plasticity, fracture initiation and propagation, and to study the applicability of brittle material based indentation fracture theory. Experiment and theory give similar results for the dependence of depth of fracture initiation, and size of plastic zone, on hydration state. Comparison of fracture propagation characteristics between wet and dry bone are examined and discussed. This research demonstrates the ability to quantitatively assess the effect of hydration on the fracture initiation, propagation, and plastic zone size of cortical bone, through an approach using simple wedge indentation, with important implications for efforts in developing methods to understand clinical diagnostic testing and general fracture behavior of living bone in the ultimate interest of health care purposes.