Abstract
This paper presents theoretical and experimental studies of the mechanical performanceand magnetorheological effects of magnetorheological elastomers (MREs) fabricated withmixtures of large and small particles. First of all, an effective permeability model wasdeveloped to theoretically analyze the MR effect of bimodal particle based MR elastomers.From the theoretical analysis, an optimum volume fraction was derived which resulted inenhanced MR effects. Two categories of iron products with different particle sizes of 50 and 5 µm were used to fabricate a series of bimodal MRE samples. Their mechanical performanceswere characterized by using an MR rheometer. Experimental results agreed fairly well withtheoretical analysis. The theoretical prediction of the optimum mixture ratio between largeand small size particles was experimentally verified.
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