新鲜长管状骨的三维有限元分析

目的建立长管状骨的有限元分析模型,并通过力学试验验证有关参数。方法通过CT扫描新鲜猪骨干4根,获得连续断层图片,导入MIMICS医学建模软件生成实体模型后,应用通用有限元分析软件HYPERMESH,进行网格划分、材料属性赋值生成有限元模型,约束边界条件,模拟受力状态进行加载,得出有限元模型上的应力分布与应变结果,并与实测实验结果对比。结果实测中发现新鲜长管状骨的HU值在-1023～2895之间,根据骨干的解剖结构和CT值的分布,分为五层:骨膜层、釉样骨层、密质骨层、松质骨层、骨髓层。骨干采用802种材料特性的赋值方式,δ取值范围为1.87~1.98之间模拟的结构与实际测得的结果最为类似。结论新鲜骨的表面有一层釉样骨结构,这部分的骨成分对于新鲜骨干的力学特性有比较重要的意义。δ取值范围为1.87～1.98之间,单元数目控制在5~10万之间,建立有限元的模型兼顾了精度与经济性,有较好的仿真度。

The Three Dimensional Finite Element Model of the Fresh Skeletom

Objective To establish a three dimensional finite element model of the fresh skeleton and verify the parameter by the biomechanical laboratory experiment.Methods Based on the sequence picture which were scanned by CT from four fresh skeletons,they were reestablished by HYPERMESH and forced by MTS.After the laboratory experiment,a contrast analysis was performed between the data from FEA with the data from MTS.Results the CT value of fresh skeleton fluctuated between-1023 and 2895,there were disparted five l...