摘要
柔顺性是冠脉支架重要的力学性能之一。本文针对一种具有非对称结构的冠脉支架,利用有限元方法深入研究与弯曲方向有关的支架柔顺性,在柔顺性数值模拟中使该支架获得较大的弯曲曲率并且考虑了接触因素。在一个周期结构内的多个弯曲方向上分别进行模拟,详细研究了支架抗弯刚度的各向异性。计算结果显示:在支架自接触现象发生前,支架的柔顺性表现为各向同性;自接触现象发生后,支架的柔顺性在不同弯曲方向上出现明显差异,表现出各向异性。另外,在平面内的纯弯曲;载荷作用下,支架不仅发生弯曲变形,还会产生平面外的偏转和围绕自身轴线的扭转变形。
Longitudinal flexibility is one of important mechanical properties of a coronary stent.This paper simulated the bending deformation of a stent until a large bending curvature was achieved.The results demonstrated that the elastic phase of bending was very short.During the simulations,the contact algorithm was appealed to produce more accurate and truthful results.Since MACTM stent possess an asymmetrical structure,it provides a probability of the aeolotropic bending behavior.The bending stiffness was studied with different loading orientation,and the final results verified the aeolotropism.The bending stiffness increased sharply and varied greatly after the occurrence of the structural self-contact.Besides the bending deformation,sideways deflection and torsion about the axis were both found by this numerical research.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2011年第3期309-314,共6页
Chinese Journal of Computational Mechanics
