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The equi-biaxial fatigue behaviour of silicone based magnetorheological elastomers (MREs) in external magnetic fields was studied. Wöhler curves relating fatigue life to stress amplitude and dynamic stored energy for MREs with a range of magnetic particle contents were derived. It was found that the fatigue life of MREs in magnetic fields was higher than that without magnetic fields. Under constant stress amplitude conditions, the presence of magnetic fields resulted in longer times for the samples to undergo large deformations and thus complex modulus (E*) decreased at a slower rate during the fatigue process, especially for low stress amplitudes. MRE samples tested in the presence of magnetic fields reached limiting values of E* at failure ranging from 1.28 MPa to 1.44 MPa. The application of magnetic fields was found to have negligible influence on the damping loss factor of MREs containing various volume fractions of carbonyl iron particles.
Zhou, Y., Johnson, M., Shipeng, W., Betts, A. and Jerrams, S. (2016) Equi-biaxial fatigue behaviour of magnetorheological elastomers in magnetic fields. Journal of Intelligent Material Systems and Structures, Published online before print July 5, 2016, Sage. doi:10.1177/1045389X16657204