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Nonlinear viscoelastic properties of MR fluids under large-amplitude-oscillatory-shear

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Abstract

Nonlinear viscoelastic properties of the MR fluid, MRF-132LD, under large-amplitude oscillatory shear were investigated. This was accomplished by carrying out the experiments under the amplitude sweep mode and the frequency sweep mode, using a rheometer with parallel-plate geometry. Investigations under the influence of various magnetic field strength and temperatures were also conducted. MR fluids behave as nonlinear viscoelastic or viscoplastic materials when they are subjected to large-amplitude shear, where the storage modulus decreases rapidly with increasing strain amplitude. Hence, MR fluid behaviour ranges from predominantly elastic at small strain amplitudes to viscous at high strain amplitudes. Large-amplitude oscillatory shear measurements with frequency sweep mode reveal that the storage modulus is independent of oscillation frequency and approaches plateau values at low frequencies. With increasing frequency, the storage modulus shows a decreasing trend before increasing again. This trend may be explained by micro-structural variation. In addition, the storage modulus increases gradually with increasing field strength but it shows a slightly decreasing trend with temperature.

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Acknowledgements

The authors wish to thank Prof. F. Gordanenjad and Prof. Hideya Nishyama for their comments.

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Authors and Affiliations

  1. Centre for Mechanics of Micro-Systems, School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore

    Weihua H. Li, Hejun Du, Guang Chen, Song Huat Yeo & Ningqun Guo

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  1. Weihua H. Li
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  2. Hejun Du
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  3. Guang Chen
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  4. Song Huat Yeo
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  5. Ningqun Guo
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Correspondence to Weihua H. Li.

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Li, W.H., Du, H., Chen, G. et al. Nonlinear viscoelastic properties of MR fluids under large-amplitude-oscillatory-shear. Rheol Acta 42, 280–286 (2003). https://doi.org/10.1007/s00397-002-0285-4

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  • DOI: https://doi.org/10.1007/s00397-002-0285-4

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