4.7 Article

Viscoelastic modelling of the tricuspid valve chordae tendineae tissue

期刊

APPLIED MATHEMATICAL MODELLING
卷 105, 期 -, 页码 648-669

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.apm.2021.12.028

关键词

Chordae tendineae; Viscoelastic model; Nonlinear generalized Kelvin model; Creep response; Uniaxial mechanical test

资金

  1. Ministry of Science and Technology of Taiwan [MOST 109-2221-E-006-004-MY3]
  2. American Heart Association Scientist Development Grant [16SDG27760143]
  3. Presbyterian Health Foundation Team Science Grant
  4. National Science Foundation Graduate Research Fellowship [GRF2020307284]

向作者/读者索取更多资源

The mechanical behavior of tricuspid valve chordae tendineae tissue is investigated in this study through experimental and theoretical approaches. The experimental results reveal the typical force-displacement curve of the tissue and a viscoelastic model is developed accordingly. The proposed model exhibits superior performance in creep and monotonic loading experiments.
In the present study, the mechanical behavior of tricuspid valve (TV) chordae tendineae tissue is investigated experimentally and theoretically. A series of uniaxial mechanical testing experiments of the TV chordae tendineae is conducted and its viscoelastic model is developed by taking into account the initial condition of displacement of the tissue. Our experimental result shows the typical J-shaped force-displacement curve of the TV chordae tendineae and the corresponding viscoelastic model is established via a nonlinear spring the is installed to replace the linear spring of the generalized Kelvin model. In addition, specified arrangements of the model parameters and the initial condition of the individual Kelvin element are proposed. The exact solutions of the model under step-wise and constant-rate forces are analytically derived and calibration of the model constants is addressed. The resulted simulation is compared with uniaxial mechanical testing of the TV chordae tendineae tissue and shows superior performance of the proposed model under creep and monotonic loading experiments. Furthermore, the sensitivity analysis and the parameter study are performed to examine the influence of initial conditions of displacement andother internal variables on the model response under step-wise and constant-rate forces. (C) 2022 Elsevier Inc. All rights reserved.

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