A 3D UNPRESSURIZED MODEL FOR NON LINEAR DYNAMIC ANALYSIS OF HUMAN AORTIC VALVE IN DYNAMIC CONDITION

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NOAMANI ALIREZA; DEHGHAN NIESTANAK VAHID; ASGARI MASOUD

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Journal: Modares Mechanical Engineering Year:2016 | Volume:16 | Issue:3 Page(s): 263-272

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Information Journal Paper

Title

A 3D UNPRESSURIZED MODEL FOR NON LINEAR DYNAMIC ANALYSIS OF HUMAN AORTIC VALVE IN DYNAMIC CONDITION

Author(s)

NOAMANI ALIREZA | DEHGHAN NIESTANAK VAHID | ASGARI MASOUD | Issue Writer Certificate

Keywords

AORTIC VALVEQ1

FINITE ELEMENT METHODQ2

UNPRESSURIZED MODELQ1

CARDIOVASCULAR BIOMECHANICSQ1

HYPERELASTIC CONSTITUTIVE MODELINGQ1

Abstract

AORTIC VALVE simulation remains a controversial topic as a result of its complex anatomical structure and mechanical characteristics such as material properties and time-dependent loading conditions. This study aims to integrate physiologically important features into a realistic structural simulation of the AORTIC VALVE. A finite element model of the natural human AORTIC VALVE was developed considering Linear Elastic and Hyperelastic material properties for the leaflets and aortic tissues and starting from the unpressurized geometry. It has been observed that although similar stress-strain patterns were generated on AORTIC VALVE for both material properties, the hyperelastic nature of valve tissue can distribute stress smoothly and with lower strain during the cardiac cycle. The deformation of the aortic root can play a prominent role as its compliance changed significantly throughout cardiac cycle. Furthermore, dynamics of the leaflets can reduce stresses by affecting geometries. The highest values of stress occurred along the leaflet attachment line and near the commissure during diastole. The effects of high +G acceleration on the performance of valve, valve opening and closing characteristics, and equivalent Von Mises stress and strain distribution are also investigated.

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