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首页> 外文期刊>Journal of Biomechanics >A validated model of passive muscle in compression.
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A validated model of passive muscle in compression.

机译：经过验证的被动肌肉受压模型。

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摘要

A better characterisation of soft tissues is required to improve the accuracy of human body models used, amongst other applications, for virtual crash modelling. This paper presents a theoretical model and the results of an experimental procedure to characterise the quasi-static, compressive behaviour of skeletal muscle in three dimensions. Uniaxial, unconstrained compression experiments have been conducted on aged and fresh animal muscle samples oriented at various angles from the fibre direction. A transversely isotropic hyperelastic model and a model using the theory of transverse isotropy and strain dependent Young's moduli (SYM) have been fitted to the experimental data. Results show that the hyperelastic model does not adequately fit the data in all directions of testing. In contrast, the SYM gives a good fit to the experimental data in both the fibre and cross-fibre direction, up to 30% strain for aged samples. The model also yields good prediction of muscle behaviour at 45 degrees from the fibre direction. Fresh samples show a different behaviour than aged tissues at 45 degrees from the fibre direction. However, the SYM is able to capture this difference and gives a good fit to the experimental data in the fibre, the cross-fibre and at 45 degrees from the fibre direction. The model also yields good prediction of muscle behaviour when compressed at 30 degrees and 60 degrees from the fibre direction. The effect of the time of test after death has also been investigated. Significant stiffening of muscle behaviour is noted a few hours after death of the subject.
机译：需要更好地表征软组织，以提高用于虚拟碰撞建模等应用的人体模型的准确性。本文提出了一个理论模型和一个实验程序的结果，以在三个维度上表征骨骼肌的准静态，压缩行为。已经对与纤维方向成不同角度定向的老化的和新鲜的动物肌肉样品进行了单轴，无约束的压缩实验。横观各向同性的超弹性模型和使用横观各向同性和应变相关的杨氏模量（SYM）理论的模型已被拟合到实验数据中。结果表明，超弹性模型不能充分拟合所有测试方向的数据。相比之下，SYM可以很好地拟合纤维和交叉纤维方向的实验数据，老化样品的应变高达30％。该模型还可以很好地预测与纤维方向成45度角的肌肉行为。新鲜样品在与纤维方向成45度角处显示出与老化组织不同的行为。但是，SYM能够捕捉到这种差异，并且非常适合光纤，交叉光纤以及与光纤方向成45度角的实验数据。当从纤维方向以30度和60度压缩时，该模型还可以很好地预测肌肉行为。还研究了死亡后测试时间的影响。在受试者死亡数小时后，注意到肌肉行为明显僵硬。

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