A composite consisting of a homogeneous isotropic elastic matrix containing infinitely long parallel circular cylinders is considered. The cylindrical fibers have identical physical properties and are firmly bonded to the matrix with uniform spatial distribution. Only plane problems are considered. Approximate formulas for the three average elastic moduli of the composite are derived by retaining the interaction between the fibers. The interaction effects are explicitly calculated as functions of the spacing between the fibers. Numerical results for a specific composite model are given.

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