Bustos Claudio A, García-Herrera Claudio M, Celentano Diego J
Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, USACH, Av. Bernardo O׳Higgins 3363, Santiago de Chile, Chile.
Departamento de Ingeniería Mecánica, Universidad de Santiago de Chile, USACH, Av. Bernardo O׳Higgins 3363, Santiago de Chile, Chile.
J Biomech. 2016 Jan 4;49(1):13-18. doi: 10.1016/j.jbiomech.2015.11.014. Epub 2015 Nov 28.
Experimental and numerical analyses focused on the mechanical characterisation of a woven Dacron vascular graft are presented. To that end, uniaxial tensile tests under different orientations have been performed to study the anisotropic behaviour of the material. These tests have been used to adjust the parameters of a hyperelastic anisotropic constitutive model which is applied to predict through numerical simulation the mechanical response of this material in the ring tensile test. The obtained results show that the model used is capable of representing adequately the nonlinear elastic region and, in particular, it captures the progressive increase of the rigidity and the anisotropy due to the stretching of the Dacron. The importance of this research lies in the possibility of predicting the graft׳s mechanical response under generalized loading such as those that occur under physiological conditions after surgical procedures.
本文介绍了针对编织涤纶血管移植物力学特性的实验和数值分析。为此，进行了不同方向的单轴拉伸试验，以研究材料的各向异性行为。这些试验用于调整超弹性各向异性本构模型的参数，该模型通过数值模拟来预测这种材料在环形拉伸试验中的力学响应。所得结果表明，所使用的模型能够充分表征非线性弹性区域，特别是它捕捉到了由于涤纶拉伸导致的刚度和各向异性的逐渐增加。这项研究的重要性在于能够预测移植物在诸如手术操作后生理条件下发生的广义载荷下的力学响应。
