镍钛合金胸主动脉支架支撑性能数值模拟

Numerical Simulation on Support Performance of NiTi Alloy Thoracic Aortic Stent

目的研究不同支撑体高度、支撑体个数和截面尺寸对镍钛合金胸主动脉支架支撑性能的影响。方法利用Auto CAD 2016和Soild Works 2014建立27款不同参数支架模型,利用Hyper Mesh 14.0进行四面体网格划分,利用ABAQUS 2017进行支撑性能模拟分析。结果支撑体高度降低,支撑刚度增加;截面尺寸越大,支撑刚度越大;随着支撑体个数增多,支撑刚度增加。支撑性能影响因素中,影响程度由大到小依次为支撑体高度、截面尺寸、支撑体个数。结论研究结果对胸主动脉支架的开发和研究具有一定指导意义,为临床支架的选择及优化提供理论依据。

Objective To study the influence of different support heights,support numbers and cross-sectional dimensions on support performance of NiTi thoracic aortic stents. Methods Twenty-seven scaffold models with different parameters were established by using AutoCAD 2016 and SoildWorks 2014 software. HyperMesh 14. 0 was used for tetrahedral mesh division,and ABAQUS 2017 was used for support performance simulation analysis.Results With the decrease of support height,the support stiffness would increase;a larger cross-section size would lead to a larger support stiffness;with the increase of support numbers,the support stiffness would increase. Among the influencing factors of support performance,the order of influence degree was support height>section size> support numbers. Conclusions The research findings have certain guiding significance for the development and research of thoracic aortic stents,and provide theoretical basis for the selection and optimization of clinical stents.