Mechatronics pp 561-567 | Cite as

Stability of Magnetorheological Effect during Long Term Operation

  • J. Roupec
  • I. Mazůrek


The article describes a determination of magnetorheological (MR) effect stability during long term operation. The experiments were carried out in a custom design rheometer, which is built in a mechanical pulsator. The rheometer design allows measurement of the rheological properties of MR fluid and its exposure to a long-term loading simultaneously, without any manipulation of the measured sample. The experiments were performed under conditions which correspond to real conditions in an automotive MR damper. The results of long term operation have shown that during the durability test the yield stress increases up to five times in the fluid off-state due to in-use-thickening (IUT). The same increase was identified in the on-state. These results disprove the hypothesis that a measurable decrease of MR effect arises during the long term operation due to the degradation of magnetic properties.


Shear Rate Term Operation Bingham Model Yield Stress Increase Magnetorheological Effect 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • J. Roupec
    • 1
  • I. Mazůrek
    • 1
  1. 1.Institute of Machine and Industrial DesignBrno University of TechnologyBrnoCZ

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