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An experimental evaluation of pre-yield and post-yield rheological models of magnetic field dependent smart materials

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Abstract

The rheological behavior of field-dependent smart fluids in both the pre-yield and post-yield regimes is investigated. Typical viscoelastic and viscoplastic models are employed to model the fluids behavior. Viscoelastic models are used widely in the pre-yield regime. Viscoplastic models are also used extensively in both the pre-yield and post-yield regimes. Two smart fluids including a ferromagnetic nanoparticle fluid and an MR fluid are examined here. Using an MCR300 rheometer, the rheological properties of the fluids in both oscillation and rotational mode are measured. In the oscillation mode, the storage and loss moduli versus frequency are measured. In the rotational mode, shear stress, shear rate, viscosity and torque are measured. In the frequency domain, the pre-yield behavior of the ferromagnetic nano-particle fluid is modeled by Kelvin-Voigt solid model. Also, the three-parameter fluid model is used to model the pre-yield behavior of the MR fluid. Two viscoplastic models including Bingham-plastic and Herschel-Bulkley models are selected to model the rheological behavior of fluids in the time domain. Which model is more appropriate depends on the external magnetic field and the shear rate. Both models are used here to model the fluids’ behavior. The models properly predict the results observed in the experiments.

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Authors and Affiliations

  1. NVA Research Centre, School of Mechanical Engineering, University of Tehran, Tehran, Iran

    N. Mohammadi, M. J. Mahjoob & S. Malakooti

  2. School of Chemical Engineering, University of Tehran, Tehran, Iran

    B. Kaffashi

Authors
  1. N. Mohammadi
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  2. M. J. Mahjoob
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  3. B. Kaffashi
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  4. S. Malakooti
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Corresponding author

Correspondence to M. J. Mahjoob.

Additional information

This paper was recommended for publication in revised form by Associate Editor Seong Beon Lee

Nader Mohammadi received the BSc. in Mechanical Engineering, Tabriz University, Iran in 1998 and the MSc. And PhD. from Univ. of Tehran in 2000 and 20009. He is currently with the Department of Mech. Eng., Azad University, Parand branch, Iran. His field has been noise control and industrial acoustics. He is currently working on sound transmission loss of ER materials.

M. J. Mahjoob (Mohammad Mahjoob Jahromi) received the BSc./MSc. from Univ. of Tehran in 1988 and the Ph.D. from University of Waterloo Canada in 1995, all in Mechanical Engineering. Since 1995, he has been with the School of Mechanical Engineering, University of Tehran, where he is now associate professor and director of NVA and Mechatronics center. His field of interest includes mechatronics, systems dynamics and control.

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Mohammadi, N., Mahjoob, M.J., Kaffashi, B. et al. An experimental evaluation of pre-yield and post-yield rheological models of magnetic field dependent smart materials. J Mech Sci Technol 24, 1829–1837 (2010). https://doi.org/10.1007/s12206-010-0607-x

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  • DOI: https://doi.org/10.1007/s12206-010-0607-x

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