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概要

This study reports the results of nondestructive testing and evaluation of artificial thermal fati gue cracks using direct current potential drop method. ?ix artificial thermal fatigue cracks, intro duced into type 304L austenitic stainless steel plates with a thickness of 25mm, are prepared; and potential drops across the cracks are measured using a direct current source of approximately 80A. The specimens are then served to destructive tests to reveal the true profiles of the cracks. Fini te element simulations on the basis of the results of the destructive tests are then carried out t o evaluate the electrical conductivity of the cracks, whose results provide good agreement between the experimental signals and simulated ones when the cracks are modeled as a nonconductive region.

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