The axisymmetric potential problem of a disc in a bimaterial sandwich is considered. A (history dependent) medium (2) with relaxation modulus G2 is sandwiched between a medium (1) with relaxation modulus G1. The two media are welded together. The interaction of a disc shaped region to a remote applied field is considered. In particular the variation of the potential field close to the rim of the disc as a function of the layer thickness and the material properties of the sandwich is investigated. A variety of asymptotic techniques are used to elucidate properties for both very small and very large values of the layer thickness and the results verified and extended to intermediate thickness by numerical solution of integral equations.
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