A mechanical analysis of conduit arteries accounting for longitudinal residual strains.
A mechanical analysis of conduit arteries accounting for longitudinal residual strains.
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DOI：
10.1007/s10439-010-9916-6
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发表时间：
2010-04
影响因子：
3.8
通讯作者：
Gleason, Rudolph L., Jr.
中科院分区：
文献类型：
--
作者：
Wang, Ruoya;Gleason, Rudolph L., Jr.
关键词：
在对动脉进行生物力学分析时，识别适当的无应力参考配置对于合理预测壁内应力分布至关重要。无应力状态通常近似为径向切割环，其通常打开成接近圆形的扇区，从而释放存在于无牵引配置中的大部分周向残余应变。开度角通常用于表征该扇区。在这项研究中，我们首先提出的实验结果表明，显着的残余变形在纵向方向上的两个常用的研究动脉在猪：颈总动脉和冠状动脉左前降支。我们得出结论，径向切割环不能完全描述动脉的无应力状态。相反，我们建议使用纵向开口角，结合传统的周向开口角，实验量化的无应力状态的动脉。其次，我们提出了一个新的运动学模型，以考虑通过采用纵向开口角的纵向残余应变的增加，并进行了应力分析。我们发现，在应力分析中加入纵向残余应变后，预测的周向应力梯度降低了3倍，预测的纵向应力梯度增加了5.7倍。因此，包含纵向残余应变对动脉中的预测应力分布具有显著影响。
Identification of an appropriate stress-free reference configuration is critically important in providing a reasonable prediction of the intramural stress distribution when performing biomechanical analyses on arteries. The stress-free state is commonly approximated as a radially cut ring that typically opens into a nearly circular sector, relieving much of the circumferential residual strains that exist in the traction-free configuration. An opening angle is often used to characterize this sector. In this study, we first present experimental results showing significant residual deformations in the longitudinal direction of two commonly studied arteries in the pig: the common carotid artery and the left anterior descending coronary artery. We concluded that a radially cut ring cannot completely describe the stress-free state of the arteries. Instead, we propose the use of a longitudinal opening angle, in conjunction with the traditional circumferential opening angle, to experimentally quantify the stress-free state of an artery. Secondly, we propose a new kinematic model to account for the addition of longitudinal residual strains through employing the longitudinal opening angle and performed a stress analysis. We found that with the inclusion of longitudinal residual strains in the stress analysis, the predicted circumferential stress gradient was decreased by 3-fold and the predicted longitudinal stress gradient was increased by 5.7-fold. Thus, inclusion of longitudinal residual strains has a significant effect on the predicted stress distribution in arteries.
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