Study On Mechanical Model And Damaged Mechanism Of Arterial Vessel

Cerebral hemorrhage is a serious disease which is harmful to human health. Study on mechanical behavior on the walls of the arteries in-depth in the viewpoint of biomechanics, Which can explain the pathological mechanism of related diseases in a certain extent. At the same time, through the analysis of a ruptured aneurysm discuss the mechanism of damage to the arteries. These work in the patients with hypertensive intracerebral causes arterial rupture mechanism has certain reference function, and the bleeding artery on the clinical diagnosis and treatment has very important theoretical and practical significance.Arteries maintain the normal blood circulation in the body, and play an important role in the normal physiological activities of the human body. The mechanical properties of the arteries depend on the mechanical properties of the collagen fibers, elastin fibers, and the smooth muscle groups. The anisotropic elastic model(HGO) is based on the mechanical model of the strain energy density function. The model can describe the anisotropic, nonlinear, super elastic properties of the arterial wall. In this paper, the application of HGO model in the axial tension of the arterial layer is simulated by the finite element method. Through the analysis of stress and strain and load displacement diagram, it is found that the HGO model can reflect the mechanical properties of the arterial wall, and the changes of the mechanical properties of the diseased artery.First, based on the HGO model of the artery, the stress changes of the model in the pulsatile blood pressure were analyzed by the Abaqus. The study found that the pressure of the aneurysm changes with the fluctuation of blood pressure. At the same time, the pressure near the apex of the aneurysm is the most, and the blood pressure changes dramatically, which is the point of rupture of the aneurysm.Secondly, the fracture principle of aneurysm was analyzed by the shear damage model, and the shear damage model was introduced in detail. The use of flow solid coupling analysis method, analysis the different pressure boundary conditions, effect of aneurysm damage failure process of factors. It is found that the blood flow velocity and blood pressure have important influence on the failure process of the aneurysm.Finally, based on the shear damage model, the process of the rupture of the aneurysm from rupture to complete rupture was analyzed. The rupture process of aneurysm is from unit failure to failure unit expansion, which leads to the failure of the large unit connected to the failure of the structure model.To sum up, this paper analyzed the mechanical properties of the artery by HGO model and finite element method, and discussed the principle of the failure of arterial injury. These work provided the reference value and the research thought for the next step to study the bleeding mechanism of the artery.