An accurate technique for pre-yield characterization of MR fluids

摘要: This study is concerned with the characterization of two types magnetorheological (MR) fluids (MR 122EG and MR 132DG) in pre-yield region. A phenomenological model proposed for characterizing complex shear modulus as a function both magnetic flux density excitation frequency using experimental data acquired fluids. The experiments were conducted sandwich beam structure an aluminum face layer fluid core layer. nearly uniform field was applied across ceramic permanent magnet bars. response characteristics cantilevered subsequently measured under harmonic excitations swept 0 to 500 Hz range considering different densities flux, ranging from 90 mT. Dynamic responses also obtained through analysis finite element (FE) developed classical plate theory. field-dependent moduli identified FE results. validity methodology demonstrated by comparing results copper comprising