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首页> 外文期刊>Journal of Biomechanics >Fu, Y.B., Chui, C.K.Modelling and simulation of porcine liver tissue indentation using finite element method and uniaxial stress-strain data
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Fu, Y.B., Chui, C.K.Modelling and simulation of porcine liver tissue indentation using finite element method and uniaxial stress-strain data

机译：傅艳宝，崔克权。猪肝组织压痕的有限元法和单轴应力-应变数据建模​​与仿真

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摘要

We hypothesize that both compression and elongation stress-strain data should be considered for modeling and simulation of soft tissue indentation. Uniaxial stress-strain data were obtained from in vitro loading experiments of porcine liver tissue. An axisymmetric finite element model was used to simulate liver tissue indentation with tissue material represented by hyperelastic models. The material parameters were derived from uniaxial stress-strain data of compressions, elongations, and combined compression and elongation of porcine liver samples. in vitro indentation tests were used to validate the finite element simulation. Stress-strain data from the simulation with material parameters derived from the combined compression and elongation data match the experimental data best. This is due to its better ability in modeling 3D deformation since the behavior of biological soft tissue under indentation is affected by both its compressive and tensile characteristics. The combined logarithmic and polynomial model is somewhat better than the 5-constant Mooney-Rivlin model as the constitutive model for this indentation simulation.
机译：我们假设压缩和伸长应力-应变数据都应考虑用于软组织压痕的建模和仿真。单轴应力-应变数据是从猪肝组织的体外加载实验中获得的。使用轴对称有限元模型以超弹性模型代表的组织材料模拟肝组织压痕。材料参数是从猪肝脏样品的压缩，伸长以及组合压缩和伸长的单轴应力-应变数据得出的。体外压痕测试用于验证有限元模拟。来自模拟的应力-应变数据以及从压缩和伸长数据组合得出的材料参数，与实验数据最匹配。这是由于其具有更好的3D变形建模能力，因为压痕下生物软组织的行为受其压缩和拉伸特性的影响。作为此压痕模拟的本构模型，对数和多项式组合模型要好于5常数Mooney-Rivlin模型。

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