Biaxial tensile tests of the porcine ascending aorta
Biaxial tensile tests of the porcine ascending aorta
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DOI：
10.1016/j.jbiomech.2016.05.005
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发表时间：
2016-07-05
影响因子：
2.4
通讯作者：
Bertrand, Eric
中科院分区：
文献类型：
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作者：
Deplano, Valerie;Boufi, Mourad;Bertrand, Eric
这项工作的目的之一是开发一个原始的定制双轴设置，以评估软组织的力学行为。进行拉伸控制的双轴拉伸试验，并实施立体数字图像相关（SDIC）来测量所产生的位移的3D分量。使用该实验装置，主要目的是在人类升主动脉病理学的更一般背景下研究猪升主动脉的机械行为。结果强调：（i）SDIC布置允许准确评估位移和应力应变曲线，（ii）猪升主动脉具有接近线性和各向异性的机械行为，直到30%的应变，（iii）猪升主动脉在周向方向上比在纵向方向上更硬，（iv）表示两个加载方向之间的相互作用的材料系数是厚度相关的，（v）考虑到样品的可变性，应力值在10（-3）至10（-1）s（-1）的值范围内与拉伸速率无关，最后，（vi）与主动脉的其他节段不同，4月龄猪升主动脉绝对不是研究人类升主动脉力学行为的相关模型。(C)2016爱思唯尔有限公司版权所有
One of the aims of this work is to develop an original custom built biaxial set-up to assess mechanical behavior of soft tissues. Stretch controlled biaxial tensile tests are performed and stereoscopic digital image correlation (SDIC) is implemented to measure the 3D components of the generated displacements. Using this experimental device, the main goal is to investigate the mechanical behavior of porcine ascending aorta in the more general context of human ascending aorta pathologies. The results highlight that (i) SDIC arrangement allows accurate assessment of displacements and so stress strain curves, (ii) porcine ascending aorta has a nearly linear and anisotropic mechanical behavior until 30% of strain, (iii) porcine ascending aorta is stiffer in the circumferential direction than in the longitudinal one, (iv) the material coefficient representing the interaction between the two loading directions is thickness dependent, (v) taking into account the variability of the samples the stress values are independent of the stretch rate in the range of values from 10(-3) to 10(-1) s(-1) and finally, (vi) unlike other segments of the aorta, 4-month-old pigs ascending aorta is definitely not a relevant model to investigate the mechanical behavior of the human ascending aorta. (C) 2016 Elsevier Ltd. All rights reserved.