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人体主动脉中的应力软化和永久变形:连续介质与计算建模及其在动脉夹闭中的应用

Stress softening and permanent deformation in human aortas: Continuum and computational modeling with application to arterial clamping.

作者信息

Fereidoonnezhad B, Naghdabadi R, Holzapfel G A

机构信息

Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.

Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran; Institute for Nano-Science and Technology, Sharif University of Technology, Tehran, Iran.

出版信息

J Mech Behav Biomed Mater. 2016 Aug;61:600-616. doi: 10.1016/j.jmbbm.2016.03.026. Epub 2016 Apr 2.

Abstract

Inelastic phenomena such as stress softening and unrecoverable inelastic deformations induced by supra-physiological loading have been observed experimentally in soft tissues such as arteries. These phenomena need to be accounted for in constitutive models of arterial tissues so that computational models can properly predict the outcome of interventional procedures such as arterial clamping and balloon angioplasty that involve non-physiological tissue loading. Motivated by experimental data, a novel pseudo-elastic damage model is proposed to describe discontinuous softening and permanent deformation in arterial tissues. The model is fitted to experimental data and specific material parameters for 9 abdominal and 14 thoracic aortas are provided. Furthermore, the model was implemented in a finite element code and numerically analyzed with respect to experimental tests, i.e. cyclic uniaxial tension in circumferential and longitudinal directions. Results showed that the model is able to capture specific features including anisotropy, nonlinearity, and damage-induced inelastic phenomena, i.e. stress softening and permanent deformation. Finite element results of a more complex boundary-value problem, i.e. aortic clamping considering the three aortic layers, residual stress, non-symmetric blood pressure after clamping, and patient-specific data are also presented.

摘要

在诸如动脉等软组织中,通过实验观察到了非弹性现象,如应力软化以及超生理负荷引起的不可恢复的非弹性变形。在动脉组织的本构模型中需要考虑这些现象,以便计算模型能够正确预测诸如动脉夹闭和球囊血管成形术等介入手术的结果,这些手术涉及非生理组织负荷。受实验数据的启发,提出了一种新颖的伪弹性损伤模型来描述动脉组织中的不连续软化和永久变形。该模型与实验数据拟合,并提供了9个腹主动脉和14个胸主动脉的特定材料参数。此外,该模型在有限元代码中实现,并针对实验测试进行了数值分析,即圆周和纵向方向的循环单轴拉伸。结果表明,该模型能够捕捉特定特征,包括各向异性、非线性以及损伤引起的非弹性现象,即应力软化和永久变形。还给出了一个更复杂的边值问题的有限元结果,即考虑三层主动脉、残余应力、夹闭后不对称血压以及患者特定数据的主动脉夹闭。

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