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STATICS AND DYNAMICS OF AN AORTIC SEGMENT CONSIDERING RESIDUAL STRESSES

机译:考虑残余应力的主动脉段的静力学与动力学

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Static and dynamic analysis of a circular cylindrical shell that models a segment of human aorta is carried out in this study. The shell is assumed to have three hyperelastic layers with residual stresses. Material data and residual stresses are taken from the literature from human toracic descending aorta. The material model is the Holzapfel-Gasser-Ogden (HGO). Dissipation is modelled by viscoelasticity. The dynamic load is given by a pulsating pressure reproducing the physiological pressure during the heart beating. The inertial effect of the contained blood fluid is taken into account. Under the static pressure, the initially soft shell becomes much stiffer, which is a common feature of soft biological tissues. The nonlinear dynamics is not particularly complicated, due to the significant damping.
机译:圆柱形外壳的静态和动态分析,在本研究中进行了人体主动脉段的模型。假设壳体具有三个具有残余应力的超级间隙层。材料数据和残余应力由人类扭矩下降主动脉的文献中取出。材料模型是Holzapfel-Gasser-Ogden(HGo)。耗散由粘弹性建模。动态负荷由脉动压力再现心脏跳动期间的生理压力给出。考虑所含血液液体的惯性效果。在静压下,最初的软壳变得太硬,这是软生物组织的常见特征。由于显着阻尼,非线性动力学并不特别复杂。

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