The electric potential CT (computed tomography) method proposed by the present authors was applied to the identification of delamination defect in layered carbon fiber reinforced plastics (CFRP) composites, which have strong anisotropy in electric conductivity. The electric potential readings on the top surface of the layered composite materials was used for the identification. The anisotropy of the electric conductivity of each layer was taken into account in the boundary element calculations of electric potential distribution. Numerical simulations were made on the identification of elliptical delaminations on the interface of layers. It was found that the method was applicable for the estimation of the location and size of delamination even in the presence of considerable measurement noise.

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