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Determination of the elastic properties of rabbit vocal fold tissue using uniaxial tensile testing and a tailored finite element model

机译：使用单轴拉伸试验和量身定制的有限元模型确定兔声带组织的弹性

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The aim of the present study was to quantify the effects of the specimen shape on the accuracy of mechanical properties determined from a shape-specific model generation strategy. Digital images of five rabbit vocal folds (VFs) in their initial undeformed conditions were used to build corresponding specific solid models. The displacement field of the VFs under uniaxial tensile test was then measured over the visible portion of the surface using digital image correlation. A three-dimensional finite element model was built, using ABAQUS, for each solid model, while imposing measured boundary conditions. An inverse-problem method was used, assuming a homogeneous isotropic linear elastic constitutive model. Unknown elastic properties were identified iteratively through an error minimization technique between simulated and measured force-time data. The longitudinal elastic moduli of the five rabbit VFs were calculated and compared to values from a simple analytical method and those obtained by approximating the cross-section as elliptical. The use of shape-specific models significantly reduced the standard deviation of the Young's modulus of the tested specimens. However, a non-parametric statistical analysis test, i.e., the Friedman test, yielded no statistically significant differences between the shape-specific method and the elliptic cylindrical finite element model. Considering the required procedures to reconstruct the shape-specific finite element model for each tissue specimen, it might be expedient to use the simpler method when large numbers of tissue specimens are to be compared regarding their Young's moduli.
机译：本研究的目的是量化样品形状对由特定形状的模型生成策略确定的机械性能准确性的影响。在其初始未变形条件下使用五个兔声带（VF）的数字图像来建立相应的特定实体模型。然后使用数字图像相关技术在表面的可见部分上测量单轴拉伸试验下VF的位移场。使用ABAQUS，为每个实体模型建立了三维有限元模型，同时强加了测量的边界条件。假设均质各向同性线性弹性本构模型，则使用反问题方法。通过在模拟和测得的力时数据之间使用误差最小化技术来迭代识别未知的弹性特性。计算了五个兔子VF的纵向弹性模量，并将其与来自简单分析方法的值和通过将横截面近似为椭圆所获得的值进行比较。特定形状的模型的使用显着降低了测试样品的杨氏模量的标准偏差。但是，非参数统计分析检验（即Friedman检验）在形状特定方法和椭圆圆柱有限元模型之间没有统计学上的显着差异。考虑到重建每个组织标本的形状特定的有限元模型所需的程序，当要比较大量组织标本的杨氏模量时，最好使用较简单的方法。

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