The present study discusses electromagnetic characteristics of modeling thermal fatigue crack in numerical simulation from view point of eddy current testing. Two thermal fatigue cracks introduced into SUS304 stainless steel plates are investigated. Eddy current signals are gathered by a differential plus point probe with several frequencies, 50 kHz, 100 kHz and 400 kHz. In the numerical simulation thermal fatigue crack is modeled as a region with constant width, true profile revealed by results of destruc...
英字タイトル:
Investigation on electromagnetic characteristics numerical simulation by eddy current testing

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 simu...
英字タイトル:
Nondestructive Testing and Evaluation of Artificial Thermal Fatigue Cracksusing Direct Current Potential Drop Method

This study evaluates the distribution of electrical contact across the surface of thermal fatigue cracks by four- terminal direct current potential drop method. This study prepared seven artificial thermal fatigue cracks, artificially introduced into Inconel or type 316L stainless steel plates with a thickness of 25 mm. Columnar specimens embedded into a resin were fabricated from the plate s to measure the electrical resistance across the cracks directly. The results indicated th at thermal fatigue crac...
英字タイトル:
Evaluation of the electrical contacts of thermal fatigue cracks across their surfaces 東北大院・工学研究科