ER fluids made of starch and CMC in silicone fluid were submitted to fatigue tests in a Material Testing System (MTS). Wohler curves were determined and the behavior of the electric current was studied. We concluded that it is possible to treat data on fatigue life of ER fluids by means of Weibull distribution and that it is possible to determine the time the "snap" begins in an ER material by monitoring the electric current. The ER fluids studied have fatigue lives similar to those of some polymers like polypropylene and polyethylene.
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