An antiplane eigenstrain problem of an elliptic inclusion in a two-phase anisotropic medium is analyzed based on the line-force concept. Explicit expressions for the stress field and strain energy are obtained under a given symmetry. The results are used to determine the stress singularity coefficient for a flat inclusion. When the tip of the inclusion is located at the interface boundary, the stress singularity coefficient S varies according to the formula S = (1 + K) S° where K is the elastic inhomogeneity factor and S° is the stress singularity coefficient for a homogeneous medium (K = 0).

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