6 April 2009 A new model for yield stress of magnetorheological greases/gels under combined effects of magnetic field and temperature
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Abstract
The goal of this study is to develop a new model to describe the behavior of shear yield stress of magnetorheological greases/gels (MRGs) under the combined effects of applied magnetic field and temperature. MRGs are a class of field-responsive materials which consist of micron-size ferrous particles suspended in a grease/gel-like material. The main advantage of a MRG over a MR fluid is that in a MRG, ferrous particles do not settle. However, the rheological properties of grease carrier materials are very sensitive to temperature. Therefore, the temperature effect on the yield stress of MRGs may be one of the main concerns in developing these materials. In this study, the steady-shear magneto-rheological response of MRGs subject to various temperatures is investigated. All experimental data are obtained for magnetic fields ranging from 0.14T to 0.53T and temperatures ranging from 10°C to 70°C. It is observed that temperature has a pronounced effect on the field induced yield stress of MRGs. A new yield stress model for MRGs which is a function of magnetic field and temperature is proposed based on the Herschel-Bulkley constitutive equation and the Arrhenius relationship. Excellent agreement between the model predictions and experimental data is obtained.
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Huseyin Sahin, Huseyin Sahin, Xiaojie Wang, Xiaojie Wang, Faramarz Gordaninejad, Faramarz Gordaninejad, } "A new model for yield stress of magnetorheological greases/gels under combined effects of magnetic field and temperature", Proc. SPIE 7288, Active and Passive Smart Structures and Integrated Systems 2009, 72881E (6 April 2009); doi: 10.1117/12.816621; https://doi.org/10.1117/12.816621
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