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Caractérisation du comportement mécanique du muscle à différentes vitesses de sollicitation

Abstract : Numerical models of the human being are developed for transport users protection. To be realistic, these models require data about the geometric and mechanical properties of each component of the body, especially muscles. However, knowledge about their mechanical properties for different kind of loadings is still sparse. In order to complete these results, an in vitro quasistatic tensile test was performed to assess human muscle passive properties. A geometrically personalized finite element model was designed. Parameters of a hyperviscoelastic constitutive law were identified. The influence of strain rate on muscle passive response was also studied. Biomechanical parameters were evaluated, and an exponential model was proposed to model the muscle response. The strain rate has an effect on the maximum load, the stiffness and the curvature parameter. As the experiments were conducted in vitro, the experimental environment was far from the physiological one. To assess the effect of the environment on the muscle response, a tensile test on animal muscles was performed in three different conditions: ambient conditions, immersion in cold saline solution, immersion in heated saline solution. The mechanical properties are sensitive to the experimental conditions, especially a change from ambient conditions to immersion. In perspectives, the mechanical properties identified will be included in a finite element modeling of the cervical spine. Finally, as muscle is a complex composite structure (fibers, collagen...), a modeling using discrete elements was set up to link microscopic and macroscopic mechanical properties of the muscle.
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https://pastel.archives-ouvertes.fr/pastel-00651874
Contributor : Laure-Lise Gras <>
Submitted on : Wednesday, December 14, 2011 - 2:18:25 PM
Last modification on : Saturday, February 15, 2020 - 2:02:25 AM
Long-term archiving on: : Thursday, March 15, 2012 - 2:36:12 AM

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  • HAL Id : pastel-00651874, version 1

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Laure-Lise Gras. Caractérisation du comportement mécanique du muscle à différentes vitesses de sollicitation. Biomécanique [physics.med-ph]. Arts et Métiers ParisTech, 2011. Français. ⟨NNT : 2011ENAM0036⟩. ⟨pastel-00651874⟩

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