CHANGING THE BEHAVIOR OF MR FLUIDS DURING LONG TERM OPERATION

Abstract eng:
The article describes results of durability test of a magnetorheological fluid (MRF) which was carried out in a custom design rheometer. The rheometer design allows measurement of the rheological properties of MR fluid and its exposure to a long-term loading simultaneously, without any manipulation of the measured sample. Owing to this, changes of the two most important parameters describing the behavior of MR fluids - dynamic viscosity and yield stress - could be followed during the durability test. The dependence of yield stress and dynamic viscosity on temperature and magnetization current was evaluated. The results show a significant change of the yield strength (500%) during the durability test. Independence of the yield stress on the temperature was conclusively proven. The viscosity decreased by 35% from its initial value after dissipation of 9000kJ out of total 119000kJ and then remained the same until the end of the durability test. Viscosity dependence on temperature was evaluated.

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