胸主动脉数值模拟与数值模型比较

Numerical simulation for aorta and different models comparing

目的探究血管在不同情况下的性质。方法用有限元方法模拟建立胸主动脉直管段血管的线弹性小变形、线弹性大变形、非线性弹性和考虑动脉壁的残余应力因素的数值模型,分析了不同模型下动脉壁的应力分布和位移分布等力学性质,并对这几种模型进行讨论和比较。结果数值分析得出残余应力改变了周向应力的分布,没有改变周向应力水平,残余应力对血管的位移没有明显影响。结论本次研究得出考虑残余应力作用后,血管内壁的应力集中明显降低。

Objective To study the properties of artery in different conditions. Method The different simulations of the aorta were made by the linear elastic model with small and large displacement, the nonlinear elastic model and the model with residual stress, respectively. We analyzed the circumference stress distributing and displacement distributing of the above four models by finite element method and made the comparison among them. Results It showed that residual stress changed the distribution of circumference stress but didn＇t change the circumference stress level, and have no clear influence on the displacement of the aorta. Conclusion Because of the exist of residual stress, the stress concentration distributing along the blood wall.has obviously decreased.