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Measuring the yield stress in magnetorheological fluids using ultrasounds
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10.1063/1.4794023
/content/aip/journal/apl/102/8/10.1063/1.4794023
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/8/10.1063/1.4794023
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup where C is the magnetic coil, M the CCD camera adapted to the objective, O is the oscilloscope, P is the ultrasonic generator, p is the Peltier system controlled by a TB, Pb is the bottom plate of the rheometer while Pu is the upper plate. PC is the computer, S the sample, and T the piezoelectric transducer.

Image of FIG. 2.
FIG. 2.

Time of flight, amplitude, and shear rate data as function of time during a complete experiment. A whole experiment consists of six different stages although it is the fourth stage, the one which provides the experimental results shown in this work. First, there was a preconditioning protocol at 100 s−1 during 100 s (I). Second, the sample was left to equilibrate at rest during another 100 s (II). Next, a dc magnetic field (approximately 15 kA/m) was suddenly applied during 100 s (III). Then, the shear stress was logarithmically increased from 0.1 Pa to 1000 Pa at a rate of 5 s per data point still in the presence of the magnetic field (IV). After that, the stress was removed in the presence of the magnetic field for about 50 s (V). Finally, the magnetic field was switched off and the data recorded for another 50 s (VI).

Image of FIG. 3.
FIG. 3.

Time of flight, amplitude, and shear rate as function of the apparent rim shear stress when no magnetic field is applied to the MR fluid (5 vol. %). Pictures from (a) to (i) show the microstructure at different stress levels.

Image of FIG. 4.
FIG. 4.

Time of flight, amplitude, and shear rate as function of the apparent rim shear stress when a magnetic field of 15 kA/m is applied to the MR fluid (5 vol. %). Pictures from (a) to (i) show the microstructure at different stress levels.

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/content/aip/journal/apl/102/8/10.1063/1.4794023
2013-03-01
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measuring the yield stress in magnetorheological fluids using ultrasounds
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/8/10.1063/1.4794023
10.1063/1.4794023
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