材料性能对股动脉SMA支架性能的影响:数值评估

IF 2.5 3区 工程技术 Q2 MECHANICS
F. Nematzadeh, M. Zolfaghari, M. Seyed-Salehi, S. K. Sadrnezhaad
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引用次数: 0

摘要

形状记忆合金(SMA)支架可以降低股动脉(FA)疾病的治疗难度。基于Helmholtz自由能(Auricchio理论)和Gibbs自由能(Lagoudas理论)对支架材料的超弹性进行了模拟。比较实证和Auricchio模型与实证数据基本符合(94%)。此外,本研究还采用有限元法评估了新设计的SMA支架在径向加载(卷曲)和卸载(释放)过程中材料性能的影响,以便在FA中应用。结果表明,具有材料性能的FA SMA支架含有293°K的Af,将Af:奥氏体表面处理温度从284°K提高到293°K,可使上平台应力(UPSs)提高46%,径向阻力(RRF)提高54%,下平台应力(lps)提高36%,慢性向外力(COF)提高26%,应变提高16%,马氏体分数(MF)提高6.77%,应变转变提高62.5%,安全系数约为2。FA SMA支架的力学和临床性能最好,其材料性能为Af为293°K,具有良好的COF、RRF和高转换应变,具有较大的MF和MH(机械迟滞)箍,具有超弹性性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Effect of material properties on femoral artery SMA stent performance: a numerical evaluation

Effect of material properties on femoral artery SMA stent performance: a numerical evaluation

Shape memory alloy (SMA) stents can be employed to decrease the difficulties of femoral artery (FA) diseases. The present simulation modeled the stent material’s superelasticity based on the Helmholtz free energy (Auricchio theory) and Gibbs free energy (Lagoudas theory). The comparative empirical and Auricchio model was almost relatively regular with the empirical data (94%). Furthermore, the present study used FEM to evaluate the impacts of the material properties of the newly designed SMA stent during the radial loading (crimping) and unloading (releasing) process for application in FA. The results showed that the FA SMA stent with material properties contains Af of 293°K, increasing the Af: Austenite finish temperature from 284 to 293°K increased upper plateau stresses (UPSs) by 46%, radial resistance force (RRF) by 54%, lower plateau stresses (LPSs) by 36%, chronic outward force (COF) by 26%, strain by 16%, martensite fraction (MF) by 6.77%, and the strain transformation by 62.5% with a safety factor of about 2. The best mechanical and clinical performance is observed in the FA SMA stent with material properties containing Af of 293°K with favorable COF, RRF, and high conversion strain associated with the great MF and MH (Mechanical Hysteresis) hoop associated with superelastic performance.

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来源期刊
CiteScore
4.40
自引率
10.70%
发文量
234
审稿时长
4-8 weeks
期刊介绍: Archive of Applied Mechanics serves as a platform to communicate original research of scholarly value in all branches of theoretical and applied mechanics, i.e., in solid and fluid mechanics, dynamics and vibrations. It focuses on continuum mechanics in general, structural mechanics, biomechanics, micro- and nano-mechanics as well as hydrodynamics. In particular, the following topics are emphasised: thermodynamics of materials, material modeling, multi-physics, mechanical properties of materials, homogenisation, phase transitions, fracture and damage mechanics, vibration, wave propagation experimental mechanics as well as machine learning techniques in the context of applied mechanics.
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