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Claus Gabriel, Christoffer Kieburg, H. Martin Laun
Clutch and brake related testing of magnetorheological fluids using the BASF twin gap magnetocell
Appl. Rheol. 20:4 (2010) 41778 (10 pages)
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A new magnetocell, based on a plate-plate twin gap with housing and integrated online flux density measurement, allows
for a reliable rheological characterization of magneto¬rheological fluids (MRF). Various modifications introduced into the
commercial magnetocell version MRD180/1T (Physica/Anton Paar), distinctly improve the homogeneity of the magnetic flux
density distribution and broaden the range of accessible shear rates in a MCR501 rheometer up to more than 3000 s-1. The
new design has been licensed to the manufacturer, to provide a commercial twin gap magnetocell. Fixed volume dosing of
MRF yields an improved reproducibility of flow curve measurements, as required for the design of technical devices like MR
clutches and MR brakes. The twin gap magnetocell enables the mimicking of MRF response relevant for clutch and brake
applications, like shear rate or shear stress step or ramp testing, and drive cycle testing.The dynamic shear stress response to
changes of flux density and/or shear rate may be characterized. Testing of MRF is possible for brake applications under constant
holding torque conditions in the pre-yield regime. MRF creep and recovery for various imposed shear stresses may be
monitored as a function of time. Comparison with a concentric cylinder pilot clutch underlines the validity of the shear stress
versus flux density characteristic as determined with the twin-gap magnetocell.
► Cite this publication as follows:
Gabriel C, Kieburg C, Laun HM: Clutch and brake related testing of magnetorheological fluids using the BASF twin gap magnetocell, Appl. Rheol. 20 (2010) 41778.
Claus Gabriel
2nd Workshop on inverse problems in rheology and related experimental techniques
Appl. Rheol. 11:5 (2001) 284-286
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► Cite this publication as follows:
Gabriel C: 2nd Workshop on inverse problems in rheology and related experimental techniques, Appl. Rheol. 11 (2001) 284.
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