This paper is concerned with an experimental investigation of a comparison of the rheological performance of an ER fluid in oscillatory squeeze-flow under DC and AC conditions. The fluid is sandwiched between two parallel plane electrodes, the upper one stationary and the lower one oscillating normal to its plane. The magnitude of the transmitted force across the fluid in the AC case is seen to be highly dependent on the shape of the input waveform and on the electrical excitation frequency. In all cases this force is found to be smaller than that seen in the corresponding DC case.

It is seen that the performance of the ER fluid depends dramatically on the size of the dispersed solid phase and has an optimum value which is dependent on the inter-electrode gap. Finally the implications of the results to vibration control and the trend of future work into squeeze flow behaviour are discussed.

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