Year 2025

• Experimental study of magnetorheological fluids under large periodic deformations

  Publication

  • W. Horak
  • B. Stępień
  • B. Sapiński

  - SMART MATERIALS & STRUCTURES - Year 2025

  Magnetorheological (MR) fluids are smart materials whose properties can be controlled by a magnetic field. They are used in a variety of applications with tailored operating parameters, facilitating broad and relatively straightforward implementation and control of the functional properties of these systems. The aim of the study was to determine the variation in shear stress of MR fluids under varying...

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Year 2024

• Impact analysis of surface roughness of the plate-plate measuring system on resistance torque in interaction with MR fluid

  Publication

  • B. Stępień
  • W. Horak

  - TRIBOLOGIA - Year 2024

  Magnetorheological (MR) fluids are complex suspensions of magnetic particles in a non-magnetic carrier fluid. They exhibit ‘smart’ properties that enable them to change their rheological parameters in response to a change in the external magnetic field applied. This behavior is used in some engineering solutions, e.g. MR clutches or brakes. For such systems to work correctly, the resistance torque achieved by contact with the...

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Year 2022

• EXPERIMENTAL STUDY OF SURFACE ROUGHNESS EFFECT ONTHE RHEOLOGICAL BEHAVIOR OF MR FLUID

  Publication

  • B. Stępień
  • W. Horak

  - TRIBOLOGIA - Year 2022

  Paper presents the results of shear stress measurements of a commercial magnetorheological fluid using a plate-plate type geometry with a modified working surface. The purpose of the study was to determine the effect of changing the roughness of the measuring plate on the obtained shear stress results. Controlled shear rate tests and Magneto Sweep measurements were carried out for three MR fluid layer heights. The tests were...

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• Experiments and Analysis of the Limit Stresses of a Magnetorheological Fluid

  Publication

  • W. Horak
  • B. Stępień
  • B. Sapiński

  - Acta Mechanica et Automatica - Year 2022

  Paper presents the results of a rheological test of a commercial magnetorheological (MR) fluid (MRF-132DG). The researchincludes the problem of measuring and interpreting limit stresses under conditions close to the magnetic saturation of the fluid. Fourdifferent limit stresses were determined, two related to the yield point and two related to the flow point. Methods for determining limitstresses, especially due to excitation...

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