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Évaluation de l’effet des vibrations sur le comportement du fluide magnéto-rhéologique

Paul-Alexis Novikoff 1
1 LISE - Laboratory of Model driven engineering for embedded systems
LIST - Laboratoire d'Intégration des Systèmes et des Technologies
Abstract : When subjected to a magnetic field, the Magneto-Rheological (MR) fluid increases its apparent viscosity and becomes a viscoelastic solid. They are used in applications requiring dissipation of mechanical energy such as shock absorbers or brakes. These devices operate in environments subject to external disturbances. In this thesis, we study the stability of magneto-rheological fluid properties when they are subjected to vibrations.When comparing the magnitude of the applied forces generated by the vibrations to the magnetic force between the particules it appears that these forces are of the same order. This implies a modification of the fluid behaviour.We developed a dedicated test bench allowing to induce vibration disturbances and to measure their impact on the fluid used in a shear mode configuration.We observed experimentally a decrease in the shear stress of the fluid. This variation depends on the modal deformation of the shearing element. Three propagation directions of vibration according to a cylindrical coordinate are studied and compared. The normal direction to the surface is the one with the most significant effect. The maximum shear stress variation reached was 40%. This phenomenon occurs for low magnetic fields, less than 250 mT, and low shear rate, less than 100 s-1.Finally, the vibration effect is studied on fluids with different viscosities and particle concentrations in order to assess their impact on the fluid’s stability.
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Submitted on : Friday, June 28, 2019 - 1:25:08 PM
Last modification on : Wednesday, October 14, 2020 - 3:39:57 AM


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  • HAL Id : tel-02168027, version 1



Paul-Alexis Novikoff. Évaluation de l’effet des vibrations sur le comportement du fluide magnéto-rhéologique. Mécanique des fluides [physics.class-ph]. Université Paris Saclay (COmUE), 2019. Français. ⟨NNT : 2019SACLX010⟩. ⟨tel-02168027⟩



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