The Field-Dependent Rheological Properties of Magnetorheological Grease Based on Carbonyl-Iron-Particles

• Main Authors: Mohamad, N., Mazlan, S. A., Ubaidillah, Ubaidillah, Choi, S. B., Nordin, M. F. M.
• Format: Article
• Published: Institute of Physics Publishing 2016
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.utm.my/id/eprint/71572/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988407741&doi=10.1088%2f0964-1726%2f25%2f9%2f095043&partnerID=40&md5=901a6d4c2dbbf94e26c72c33944818cc

This paper presents dynamic viscoelastic properties of magnetorheological (MR) grease under variation of magnetic fields and magnetic particle fractions. The tests to discern the field-dependent properties are undertaken using both rotational and oscillatory shear rheometers. As a first step, the MR grease is developed by dispersing the carbonyl iron (CI) particles into grease medium with a mechanical stirrer. Experimental data are obtained by changing the magnetic field from 0 to 0.7 T at room temperature of 25 °C. It is found that a strong Payne effect limits the linear viscoelastic region of MR grease at strains above 0.1%. The results exhibit a high dynamic yield stress which is equivalent to Bingham plastic rheological model, and show relatively good MR effect at high shear rate of 2000 s-1. In addition, high dispersion of the magnetic particles and good thermal properties are proven. The results presented in this work directly indicate that MR grease is a smart material candidate that could be widely applicable to various fields including vibration control.