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A Comparison of Different Nitinol Material Data Sources for Finite Element Analysis

机译：镍钛诺材料数据源的有限元分析比较

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Nitinol (NiTi) is widely used for minimal invasive vascular implants due to its superelastic material behavior. Today computerized finite element analysis (FEA) modeling is a standard tool for the development of medical devices and an essential part of the product design and device approval process (X. Gong and A.R. Pelton, ABAQUS Analysis on Nitinol Medical Applications, Proceedings of ABAQUS User's Conference, New Port, Rhode Island, 2001, p 1; N. Rebelo and M. Perry, Finite Element Analysis for the Design of Nitinol Medical Devices, Min. Invas. Ther. Allied Technol., 2000, 9(2), p 75). Quality of simulation depends on a multitude of parameters such as the mathematical material model and FE model generation (meshing). As such, a superior material data input is crucial in order to calculate the correct stress and strain conditions. In this study, we used different sources for material data input for our FE simulations. We compared simulated output versus the experimental results using a stent-like structure after various heat treatments. We used NiTi literature data, tensile data from raw as-supplied NiTi tubes as well as tensile and compression data from microtest samples which underwent stent-like processing for our FEA modeling. A FEA model of the diamond shape (DS) was constructed to quantify and visualize the force and motion response after applying different loading conditions similar to physiologic stress and strain. Force-deflection response of the virtual model was compared against the differently processed DS specimen. All results were put into a matrix in order to evaluate the quality of the different inputs for the FEA. The goal of this study was to demonstrate the importance of selecting and applying the correct material parameter inputs and to further show the importance of not just using given parameter, but also calibrating the values to get accurate results of FE simulations.
机译：镍钛诺（NiTi）由于其超弹性的材料性能而广泛用于微创血管植入物。如今，计算机化有限元分析（FEA）建模已成为开发医疗器械的标准工具，并且是产品设计和器械批准流程的重要组成部分（X. Gong和AR Pelton，《 ABAQUS镍钛诺医疗应用分析》，《 ABAQUS用户论文集》会议，新港，罗德岛，2001年，第1页; N。Rebelo和M. Perry，《镍钛诺医疗器械设计的有限元分析》，《最小入侵》，《 Ther.Allied Technol。》，2000年，第9页，p 75）。仿真质量取决于多种参数，例如数学材料模型和有限元模型生成（网格划分）。因此，出色的材料数据输入对于计算正确的应力和应变条件至关重要。在这项研究中，我们为有限元模拟使用了不同的材料数据输入来源。我们比较了各种热处理后使用支架状结构的模拟输出与实验结果。我们使用NiTi文献数据，原始提供的NiTi管的拉伸数据以及微量样品的拉伸和压缩数据进行了FEA建模，这些样品经过了类似支架的处理。构造了钻石形状（DS）的FEA模型，以在施加类似于生理应力和应变的不同加载条件后，量化和可视化力和运动响应。将虚拟模型的力-挠度响应与经过不同处理的DS标本进行了比较。将所有结果放入一个矩阵中，以评估FEA不同输入的质量。这项研究的目的是证明选择和应用正确的材料参数输入的重要性，并进一步表明不仅使用给定参数，而且还要校准值以获得有限元仿真的准确结果的重要性。

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