Abstract
The primary goal of the research reported in this paper has been to characterize and modelthe compression properties of magneto-rheological elastomers (MREs). MRE sampleswere fabricated by curing a two-component elastomer resin with 30% content of10 µm sized iron particles by volume. In order to vary the magnetic field during compressivetesting, a test fixture was designed and fabricated in which two permanent magnets couldbe variably positioned on either side of the specimen. Changing the distance between themagnets of the fixture allowed the strength of the magnetic field passing uniformly throughthe sample to be varied. Using this test setup and a dynamic test frame, a series ofcompression tests of MRE samples were performed, by varying the magneticfield and the frequency of loading. The results show that the MR effect (per centincrease in the material ‘stiffness’) increases as the magnetic field increases andthe loading frequency increases within the range of the magnetic field and inputfrequency considered in this study. Furthermore, a phenomenological model wasdeveloped to capture the dynamic behaviors of the MREs under compressionloadings.
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