简易外固定架自攻螺钉的三维有限元模型的初步建立及应用

Reconstruction and application of three dimensional finite element analysis model of single self-tapping screw of simple external fixation

摘要:

目的：建立外固定架螺钉钻入胫骨干的三维有限元模型。方法：运用 Mimics软件，Pro/E，Geomagic Studio，Ansys Work－bench13成功建立胫骨螺钉装配体三维有限元模型，并施加轴向载荷，扭转载荷观察结果。结果：装配体共生成3 710个体网格，6 952个点，Von-Mises和Total Deformation应力云图显示轴向和扭转载荷螺钉的最大应力位于螺钉与皮质骨接触处，形变最大的位置在钉尾。结论：三维胫骨螺钉装配体有限元模型为螺钉与胫骨的应力的定量研究提供基础，为不同材料属性，不同载荷的螺钉的生物力学研究提供基础。

Abstract:

Objective：To establish three dimensional finite element analysis（FEA） model of single external fixation screw penetrating into tibia shaft. Methods：Softwares of Mimics，Pro/E，Geomagic Studio，Ansys Workbench13 were used to set up FEA model of tibia-screw assembly successfully；results after applying force and moment loads were observed. Results：The shaft of tibia and single exter－nal fixation screw generated 3 710 volume meshes，6 952 nodes. Von-Mises stress and Total Deformation revealed the maxium stress of the screw and total deformation were located at contact surface and screw tail respectively. Conclusions：Three dimensional tibia-screw assembly model can provide basis for quantitative studies of stresses of the screw and the tibia as well as for biomechanical study of screws made by different materials and with different loads.