物理学报
物理學報
물이학보
2000年
9期
944-948
,共5页
刘立伟%王作维%刘戈%蒋勇刚%邱志勇%周鲁卫
劉立偉%王作維%劉戈%蔣勇剛%邱誌勇%週魯衛
류립위%왕작유%류과%장용강%구지용%주로위
Electrorheological Fluids,Resonance Response,Squeeze FlowPACC: 8350,8380,6230
The resonance effect of microcrystalline cellulose/castor oil electrorheological (ER) suspensions was studied in a compressed oscillatory squeeze flow under external electric fields. The resonance frequency first increases linearly with increasing external field, and then shift to high-field plateau. The amplitudes of resonance peak increase sharply with the applied fields in the range of 0.17-1.67kV/mm. The phase difference of the.reduced displacement relative to the excitation force inverses in the case of resonance. A viscoelasticity model of the ER suspensions, which offers both the equivalent stiffness and the viscous damping, should be responsible for the appearance of resonance. The influence of the electric field on the resonance frequency and the resonance hump is consistent qualitatively with the interpretation of our proposed model. Storage modulus G′ was presented for the purpose of investigating this influence.
