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首页> 外文期刊>Journal of the mechanical behavior of biomedical materials >Characterization of three-dimensional anisotropic heart valve tissue mechanical properties using inverse finite element analysis
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Characterization of three-dimensional anisotropic heart valve tissue mechanical properties using inverse finite element analysis

机译:三维各向异性心脏瓣膜组织力学特性的逆有限元分析

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Computational modeling has an important role in design and assessment of medical devices. In computational simulations, considering accurate constitutive models is of the utmost importance to capture mechanical response of soft tissue and biomedical materials under physiological loading conditions. Lack of comprehensive three-dimensional constitutive models for soft tissue limits the effectiveness of computational modeling in research and development of medical devices. The aim of this study was to use inverse finite element (FE) analysis to determine three-dimensional mechanical properties of bovine pericardial leaflets of a surgical bioprosthesis under dynamic loading condition. Using inverse parameter estimation, 3D anisotropic Fung model parameters were estimated for the leaflets. The FE simulations were validated using experimental in-vitro measurements, and the impact of different constitutive material models was investigated on leaflet stress distribution. The results of this study showed that the anisotropic Fung model accurately simulated the leaflet deformation and coaptation during valve opening and closing. During systole, the peak stress reached to 3.17 MPa at the leaflet boundary while during diastole high stress regions were primarily observed in the commissures with the peak stress of 1.17 MPa. In addition, the Rayleigh damping coefficient that was introduced to FE simulations to simulate viscous damping effects of surrounding fluid was determined. 9C) 2016 Elsevier Ltd. All rights reserved.
机译:计算建模在医疗设备的设计和评估中具有重要作用。在计算仿真中,考虑准确的本构模型对于捕获生理负荷条件下的软组织和生物医学材料的机械响应至关重要。缺乏用于软组织的全面的三维本构模型,限制了计算模型在医疗设备研发中的有效性。这项研究的目的是使用逆有限元(FE)分析来确定动态负载条件下外科生物假体的牛心包小叶的三维力学性能。使用反参数估计,为小叶估计3D各向异性Fung模型参数。使用体外实验验证了有限元模拟,并研究了不同本构材料模型对小叶应力分布的影响。研究结果表明,各向异性的Fung模型可以准确地模拟瓣膜打开和关闭过程中的小叶变形和接合。在收缩期,小叶边界处的峰值应力达到3.17 MPa,而在舒张期中,主要在合缝处观察到高应力区域,峰值应力为1.17 MPa。此外,确定了被引入到有限元模拟中以模拟周围流体的粘性阻尼效应的瑞利阻尼系数。 9C)2016 Elsevier Ltd.保留所有权利。

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