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针对心血管狭窄,血管支架是一个十分有效的非破坏性治疗方法。但是支架在植入人体后还存在一些问题,例如支架失稳破坏。植入人体后,由于血管规律的收缩扩张引起了长周期疲劳破坏。这里主要的受力方式为轴向拉伸和压缩。研究数据表明,在植入后人体后,支架的横截面呈椭圆形,这会影响支架的拉伸疲劳性能。在本研究中,针对横截面形状为圆形和椭圆形的支架的拉伸疲劳性能进行了有限元分析。应用等效应力(SEQA)去评估支架的横截面形状对拉伸疲劳性能的影响,SEQA显示了和Von Mises应力完全不同的结果。
Vascular stenting is a very effective non-destructive treatment for cardiovascular stenosis. However, there are still some problems after the stent is implanted into the human body, for example, the stent is damaged by instability. Implantation of the human body, due to the contraction of the vasculature caused by the expansion of long-term fatigue damage. The main method of stress here is axial stretching and compression. Research data show that the cross section of the stent is elliptical after implantation, which affects the tensile fatigue properties of the stent. In this study, finite element analysis was performed on the tensile fatigue behavior of stents with round and oval cross-sections. Using equivalent stress (SEQA) to assess the effect of stent cross-sectional shape on tensile fatigue properties, SEQA shows completely different results than Von Mises stress.