Abstract In this study, structural analysis and one-way fluid-structure interaction (FSI) analysis were performed to identify the effect of fluid presence on the mechanical behavior of the stents during stent expansion. An idealized vessel model with stenosis was used for simulation, and stents made of metal and polymer were assumed, respectively. The bilinear model was applied to the stents, and the Mooney-Rivlin model was applied to the arterial wall and plaque. The blood used in the FSI analysis was assumed to be a non-Newtonian fluid. As a result of all numerical simulations, the von Mises stress, the first principal stress and the displacement were calculated as the mechanical behaviors. Through the comparison of the results of the structural analysis with those of the one-way FSI analysis, our results indicated the fluid had no significant influence on the expansion of the metal stent. However, it was found that the expansion of the polymer stent affected by the presence of fluid. These findings meant the one-way FSI technique was suggested to achieve an accurate analysis when targeting a polymer stent for numerical simulation.

中文翻译：

---

确定流体存在对冠状动脉支架扩张过程中支架力学行为影响的数值研究

摘要 在这项研究中，进行了结构分析和单向流固耦合 (FSI) 分析，以确定流体存在对支架扩张过程中支架机械性能的影响。使用具有狭窄的理想血管模型进行模拟，并分别假设由金属和聚合物制成的支架。双线性模型应用于支架，Mooney-Rivlin模型应用于动脉壁和斑块。FSI 分析中使用的血液被假定为非牛顿流体。作为所有数值模拟的结果，von Mises 应力、第一主应力和位移被计算为力学行为。通过将结构分析的结果与单向 FSI 分析的结果进行比较，我们的结果表明，流体对金属支架的扩张没有显着影响。然而，发现聚合物支架的膨胀受流体存在的影响。这些发现意味着在针对聚合物支架进行数值模拟时，建议使用单向 FSI 技术来实现准确分析。