MR fluid behavior under constant shear rates and high magnetic fields over long time periods

Constantin Ciocanel, Kevin Molyet, Hideki Yamamoto, Sheila L. Vieira, Nagi G. Naganathan

Research output: Contribution to journalConference articlepeer-review


MR fluids are smart materials that reversibly change their rheological properties in the presence of a magnetic field. Their capability to support a high range of shear stresses makes them an ideal component of many mechanical devices. However, to be suitable for applications requiring a large number of cycles, e.g. a clutch, the long term behavior of these fluids needs to be thoroughly investigated and well understood. The paper presents a new MR cell design along with a study of the shear rate, shear strain, magnetic field and time influences on the properties and behavior of a MR fluid tested for long periods of time. The MR cell is required to adapt a commercially available rheometer to measure the rheological properties of the fluid. Overall characteristics of the designed MR cell output capability are provided. Constant shear rate tests, two hours in duration, have been performed at shear rates between 0.1 and 200 1/s under magnetic field intensities up to 0.4 T. The rheological measurements indicated that the time, the shear strain and the shear rate influence the fluid's shear stress magnitude.

Original languageEnglish (US)
Article number61726
Pages (from-to)221-226
Number of pages6
JournalAmerican Society of Mechanical Engineers, Aerospace Division (Publication) AD
StatePublished - 2004
Event2004 ASME International Mechanical Engineering Congress and Exposition - Anaheim, CA, United States
Duration: Nov 13 2004Nov 19 2004


  • Constant shear
  • High magnetic field
  • Long time
  • Magnetorheological (mr) fluid

ASJC Scopus subject areas

  • Mechanical Engineering
  • Space and Planetary Science


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