Viscoelastic properties of MR fluids under oscillatory shear

Weihua Li; Hejun Du; G. Chen; Song Huat Yeo

doi:10.1117/12.432732

2 July 2001 Viscoelastic properties of MR fluids under oscillatory shear

Weihua Li, Hejun Du, G. Chen, Song Huat Yeo

Proceedings Volume 4331, Smart Structures and Materials 2001: Damping and Isolation; (2001) https://doi.org/10.1117/12.432732
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

Abstract

In this paper, viscoelastic properties of MR fluids under oscillatory shear were experimentally studied using a rheometer with parallel-plate geometry. The experiments were conducted with amplitude sweep mode and frequency sweep mode. For the amplitude sweep mode, the driving frequency is fixed at a given value of (omega) rad/s and the strain amplitude, (gamma) ₀, is swept from 0.01% to 100$; For the frequency sweep mode, the strain amplitude is fixed at a certain strain, (gamma) ₀, and driving frequency is swept from 1 to 11 Hz. Consequently, the effects of strain amplitude, frequency, magnetic field strength, and temperature on the viscoelastic properties of MR fluids were investigated. MR fluid behaves as a linear viscoelastic body for sufficiently small strain amplitude ((gamma) ₀<EQ(gamma) _lin), while nonlinear viscoelastic behavior is observed for high strain ranges ((gamma) ₀>(gamma) _lin). At small strain amplitudes, the storage modulus and the loss modulus are independent of strain amplitude. At high strain amplitudes, the storage modulus is independent of the frequency and approaches plateau values at low frequencies. With increasing frequency, the storage modulus shows a decreasing trend before increasing again. The loss modulus varies slightly with frequency. MR fluid shows elastic-dominated properties in a magnetic field. Both the storage modulus and the loss modulus increase significantly with increasing field of strength. The temperature dependence of viscoelastic properties is also discussed. For the experimental temperature range of 20 degree(s)C to 60 degree(s)C, the storage modulus shows a slightly decreasing trend with temperature.

Citation Download Citation

Weihua Li, Hejun Du, G. Chen, and Song Huat Yeo "Viscoelastic properties of MR fluids under oscillatory shear", Proc. SPIE 4331, Smart Structures and Materials 2001: Damping and Isolation, (2 July 2001); https://doi.org/10.1117/12.432732

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