The degradable performance of bile-duct stent based on a continuum damage model: A finite element analysis.,International Journal for Numerical Methods in Biomedical Engineering

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The degradable performance of bile-duct stent based on a continuum damage model: A finite element analysis.
International Journal for Numerical Methods in Biomedical Engineering ( IF 2.2 ) Pub Date : 2020-06-25 , DOI: 10.1002/cnm.3370
Xiaoyu Ni ₁ , Yanhong Zhang ₁ , Changwang Pan ₂

Affiliation

Biomedical magnesium alloy stents have become a hot bed of research focus in interventional therapy for nonvascular diseases. In this study, a numerical model for a balloon‐expandable bile duct stent made of magnesium alloy with laser sculpture is developed to predict the effects of the degradation of the stent on the biomechanical behavior in the stent‐bile duct coupling system. Based on a continuum damage model, the degradable model of the stent is built to understand its performance in an idealized bile duct as it is subject to corrosion over time. The degradation model developed in this study addresses the uniform corrosion and pitting corrosion. By means of the secondary development function of commercial numerical software ANSYS, the finite element analysis procedures were written to control the degradation process based on the technology of element “birth and death,” and it is shown how the three‐dimensional model and approach give the possibility of analyzing for the degradation mechanism of a magnesium alloy stent in the bile duct or other nonvascular cavities.

中文翻译：

基于连续损伤模型的胆管支架可降解性能：有限元分析。

生物医用镁合金支架已成为非血管疾病介入治疗的研究热点。在这项研究中，开发了一个带有激光雕刻的镁合金球囊扩张胆管支架的数值模型，以预测支架降解对支架-胆管耦合系统生物力学行为的影响。基于连续损伤模型，构建支架的可降解模型以了解其在理想化胆管中的性能，因为它会随着时间的推移而受到腐蚀。本研究中开发的退化模型解决了均匀腐蚀和点蚀问题。借助商业数值软件ANSYS的二次开发功能，

更新日期：2020-06-25

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