Abstract
The electric potential CT method proposed by the present authors was applied to the measurement of a three-dimensional elliptical internal crack embedded in a steel rod. Data of electric potential distribution observed on the surfaces of the rod were computer-processed inversely to identify the crack location, shape and size. As an inversion software, the least residual method was employed. This method was based on the least residual criterion, in which residuals were evaluated between observed potential data and those computed by the boundary element method for various assumed cracks. A hierarchical scheme, which involved two-dimensional scanning inverse analyses and subsequent three-dimensional inverse analyses, was applied successfully for efficient crack identification. The location, shape and size of the elliptical internal crack were determined by the proposed method with good accuracies.
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