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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >A New Model for Yield Stress of Magneto-Rheological Greases/Gels under Combined Effects of Magnetic Field and Temperature
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A New Model for Yield Stress of Magneto-Rheological Greases/Gels under Combined Effects of Magnetic Field and Temperature

机译：磁场和温度共同作用下磁流变脂/凝胶屈服应力的新模型

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摘要

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℃ to 70℃. 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.
机译：这项研究的目的是开发一个新模型来描述在施加磁场和温度共同作用下磁流变润滑脂/凝胶（MRG）的剪切屈服应力行为。 MRG是一类场响应性材料，由悬浮在油脂/凝胶状材料中的微米级铁颗粒组成。 MRG相对于MR流体的主要优点是，在MRG中，铁颗粒不会沉淀。但是，油脂载体材料的流变特性对温度非常敏感。因此，温度对MRGs屈服应力的影响可能是开发这些材料的主要问题之一。在这项研究中，研究了MRG在不同温度下的稳态剪切磁流变响应。所有的实验数据都是在0.14T至0.53T的磁场和10℃至70℃的温度范围内获得的。观察到温度对磁场诱导的MRGs的屈服应力有明显的影响。基于Herschel-Bulkley本构方程和Arrhenius关系，提出了一种新的MRG屈服应力模型，该模型是磁场和温度的函数。模型预测和实验数据之间获得了极好的一致性。

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