Document Type

Article

Publication Date

3-1-2000

Publication Title

Journal of Applied Physics

Abstract

The yield stress of magnetorheological (MR) fluids depends on the induced solid structure. Since thick columns have a yield stress much higher than a single-chain structure, we improve the yield stress of MR fluids by changing the fluid microstructure. Immediately after a magnetic field is applied, we compress the MR fluid along the field direction. Scanning electron microscopy images show that particle chains are pushed together to form thick columns. The shear force measured after the compression shows that the structure-enhanced static yield stress can reach as high as 800 kPa under a moderate magnetic field, while the same MR fluid has a yield stress of 80 kPa without compression. This improved yield stress increases with the magnetic field and compression pressure and has an upper limit well above 800 kPa. The method may also be useful for electrorheological fluids. (C) 2000 American Institute of Physics. [S0021-8979(00)02405-1].

Volume

87

Issue

5

First Page Number

2634

Last Page Number

2638

DOI

10.1063/1.372229

Publisher Statement

© 2000, The American Institute of Physics. Available on publisher's site at http://jap.aip.org/.

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