变应变率下骨骼肌连续介质本构模型
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1.天津科技大学;2.天津市天津医院创伤科;3.天津市河西区天津科技大学;4.北京航空航天大学

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A continuum constitutive model of skeletalmuscle under variable strain rate
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    摘要:

    摘要:目的 针对不同结构耦合肌肉主被动行为无法考虑肌肉组织连续介质力学特性的问题,提出运用被动与主动耦合在同一个本构方程的方法,构建了骨骼肌连续介质超弹性主被动本构模型。方法 为标定被动本构模型参数,给出了单轴拉伸实验方法及条件,并通过理论推导,介绍了利用试验数据求解被动模型参数的具体方法。为验证主动模型的有效性,以实例对模型进行了验证。结果 模型预测曲线与实验输出应力拉伸比曲线具有较好的一致性,在相同应变下的情况下,被动应力和总应力最大误差仅为0.02 MPa和0.04 MPa。结论 该连续介质超弹性本构模型能较好模拟骨骼肌的主被动行为,从而有利于下一步人体肌肉的建模与仿真。

    Abstract:

    Abstract:Objective Aiming at the problem that the active and passive behaviors of different structurally coupled muscles cannot consider the mechanical properties of the continuum of muscle tissue, a method of passive and active coupling in the same constitutive equation is proposed to construct a superelastic active and passive constitutive model of skeletal muscle continuum.Methods In order to calibrate the parameters of the passive constitutive model, the uniaxial tensile experiment method and conditions are given, and through theoretical derivation, the specific method of using the experimental data to solve the passive model parameters is introduced. In order to verify the effectiveness of the active model, simulation analysis of the model is carried out with an example. Results The simulation results show that the experimental simulation results are in good agreement with the experimental output stress-stretch ratio curve. Under the same strain, the maximum error of passive stress and total stress is only 0.02 MPa and 0.04 MPa.Conclusions The continuum hyperelastic constitutive model can better simulate the active and passive behavior of skeletal muscle, which is beneficial to the next step of modeling and simulation of human muscles.

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  • 收稿日期:2020-11-11
  • 最后修改日期:2021-02-02
  • 录用日期:2021-02-03
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