Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Canada H3A 0C3.
Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Canada H3A 0C3.
J Mech Behav Biomed Mater. 2018 Jun;82:282-290. doi: 10.1016/j.jmbbm.2018.03.038. Epub 2018 Mar 30.
In case of direction-dependent viscoelasticity, a simplified formulation of the three-dimensional quasi-linear viscoelasticity has been obtained manipulating the original Fung equation. The experimental characterization of the static hyperelastic behaviour, the relaxation, the dynamic modulus and the loss factor of woven Dacron from a commercial aortic prosthesis has been performed. An 11% difference of the reduced relaxation (after infinite time) between axial and circumferential directions has been observed for the woven Dacron. A very large increase in stiffness is obtained in case of harmonic loading with respect to the static loading. These findings are particularly relevant for dynamic modelling of currently used aortic grafts.
在各向异性黏弹性的情况下，通过操纵原始 Fung 方程，得到了简化的三维准线性黏弹性公式。对商业主动脉假体用的机织涤纶的静态超弹性行为、松弛、动态模量和损耗因子进行了实验特性描述。在机织涤纶中，轴向和周向的松弛（在无限时间后）的降低幅度相差 11%。与静态加载相比，在谐波加载的情况下，刚度有很大的提高。这些发现对于当前使用的主动脉移植物的动态建模具有特别重要的意义。
