A theoretical framework to analyze bend testing of soft tissue
A theoretical framework to analyze bend testing of soft tissue
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DOI：
10.1115/1.2401191
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发表时间：
2007-02-01
影响因子：
1.7
通讯作者：
Nicosia, Mark A.
中科院分区：
文献类型：
--
作者：
Nicosia, Mark A.
据推测，重复弯曲应力会导致生物心脏瓣膜的疲劳诱导失效。虽然已经描述了能够测量生物材料的弯曲特性的实验装置，但是分析所得到的数据的理论框架仍然很薄弱。鉴于这些弯曲实验中存在的大位移和大多数生物材料的非线性本构行为，这样的制定必须基于有限弹性理论，我们提出了这样一个理论在这项工作中，这是能够拟合弯矩与曲率半径的实验数据，以任意应变能函数。建立了一个简单的有限元模型来研究所提出的方法的有效性。为了证明所提出的方法的应用，弯曲测试数据从文献中的臀肌固定的牛心包被拟合到一个非线性应变能函数，这表明良好的协议的数据。该方法可用于软组织本构模型中弯曲行为的集成。
It has been hypothesized that repetitive flexural stresses contribute to the fatigue-induced failure of bioprosthetic heart valves. Although experimental apparatuses capable of measuring the bending properties of biomaterials have been described, a theoretical framework to analyze the resulting data is tacking. Given the large displacements present in these bending experiments and the nonlinear constitutive behavior of most biomaterials, such a formulation must be based on finite elasticity theory we present such a theory in this work, which is capable of fitting bending moment versus radius of curvature experimental data to an arbitrary strain energy function. A simple finite element model was constructed to study the validity of the proposed method. To demonstrate the application of the proposed approach, bend testing data from the literature for gluteraldehyde-fixed bovine pericardium were fit to a nonlinear strain energy function, which showed good agreement to the data. This method may be used to integrate bending behavior in constitutive models for soft tissue.