Field–Frequency-Dependent Non-linear Rheological Behavior of Magnetorheological Grease Under Large Amplitude Oscillatory Shear

This article investigates the influence of frequency on field-dependent non-linear rheology magnetorheological (MR) grease under large amplitude oscillatory shear (LAOS). First, LAOS tests with different driving frequencies were conducted MR at four magnetic fields, and storage loss moduli 0.1, 0.5, 1, 5 Hz compared to obtain an overall understanding frequency-dependent viscoelastic behavior grease. Based this, three-dimensional (3D) Lissajous curves decomposed stress two typical depicted provide elastic viscous behavior. Finally, measures containing higher harmonics from Fourier transform (FT)-Chebyshev analysis used quantitatively interpret grease, namely, strain stiffening (softening) thickening (thinning), fields. It was found that, application field, onset frequency-dependent. However, when increased in post-yield region, MRG-70 not affected by frequency.