Finite Element Analysis Of Aortic Arch With Residual Stress

This task comes from the item named"Study on mechanics of aortic dissecting aneurysm"which supported by National Nature and Science Fund. Investigation about the displacement and stress of aortic arch is hot topics in medicine and biomechanics. It is closely connected with cardiovascular motion and the cause and development of aortic dissecting aneurysm. So, the investigation on the displacement and stress of aortic arch especially with residual stress is very important and significant.First of all, the method of building and adding residual stress in the numerical simulation process is new and correct. Then use this method to add residual stress in the model of aortic arch.It is compared the displacement and stress of aortic arch undering different loads with residual and no-residual stress by finite element method. After distortion the sections of bended segment change to ellipse and the long axes is along the line from front to back; Expand ratio of the long axes of ellipse in the bended segment is the most, and of the short axes of ellipse in the bended segment is the least; The axes of inside and outside in the aortic arch is same, and the most distance is closely to heart; Residual stress by which the focus of stress is depressed affects the circumferential stress and does not affect the parameter of morphologic. The load inside the aortic arch affects the value of circumferential stress and does not affect the distributing of circumferential stress. The circumferential stress along the radial in the straight segment changes faster than that of bended segment. The most stress level is in the inside direction and the most grads of changes of stress is in the outside direction and the trend of changes in the front and back is the same. Finally, we compared the results of numerical simulation and the results of animal experiment in qualitative, they are coincident very much which validate the correctness of the method and results of the numerical simulation.The numerical simulation of mechanics behavior of the aortic arch wall with residual stress is completely done. That can provide scientific gist for studying the mechanical factor of aortic dissecting aneurysm. And it is advantageous for studying blood vessel and blood interaction.The method of building and adding the residual stress can be used in other instance with complicated geometry shape and unsymmetrical residual stress.