足部有限元模型的构建与验证

背景:目前国内所建的足部模型大部分是采用自动划分网格的四面体有限元模型,虽然四面体网格自动剖分技术给三维实体的有限元网格自动剖分带来了极大的方便,但力学性能较差。目的:基于CT图片构建六面体网格足部有限元模型。方法:选取中国正常男性人体足部的CT数据,利用Mimics软件对足部几何模型进行重构,运用NURBS曲面的节点插入算法,对足部几何模型进行了细化,构建了具有较高生物仿真度的人体足部有限元模型,利用Pam-crash软件对模型进行了碰撞仿真分析。结果与结论:仿真结果与尸体实验结果基本一致,证明模型可信。实验基于CT图片构建的六面体网格足部有限元模型,添加了足底肌肉、肌腱、皮肤等结构,更真实的反映了足部解剖学结构特征,进而提高了有限元模型的质量,更能有效地研究足部损伤机制,从而为提高汽车安全性设计提供参考依据。

Construction and verification of the foot finite element model

BACKGROUND:At present,the foot model was mostly automatic tetrahedral mesh finite element model.Although the automatically partition technology of tetrahedral grid has brought great convenience to the automatically partition of three-dimensional entitative finite element mesh,the mechanical properties are poor.OBJECTIVE:To construct finite element model of the foot with hexahedral mesh based on CT images.METHODS:The CT data of normal male foot was selected,using Mimics software to reconstruct the geometric model of the foot,and using NURBS surfaces knot insertion algorithm to refine the geometric model.A high degree of biological simulation finite element model of the human foot was established,using Pam-crash software to undergo collision and simulation analysis.RESULTS AND CONCLUSION:The results of simulation accorded with results of cadaveric experiments,which showed a good validity of the model.Experiment constructed hexahedral mesh finite element model of the foot based on CT images,foot muscle,tendon and skin were added,thus it could response more realistic to the anatomical structure of the foot,and improved the quality of the finite element model,more effective to study mechanism of the foot injury,so as to provide fundamental data for improve vehicle safety design reference.