This paper addresses the problem of Traumatic Aorta Rupture (TAR) that is one of the causes of fatality in motor vehicle accidents. The mechanisms that have been suggested for TAR are speculative and inconclusive and a lot of the tests performed have not been repeatable. One of the reasons for these speculations is an incomplete understanding of the material properties of the aorta. The goal of this research is to study the response of the aorta to the oscillating pressure inputs in order to identify the structural properties of the aorta. The results of this study show that aorta stiffens as the rate of the loading increases, which is a characteristic of viscoelastic materials.