熱疲労割れ破面の電気的接触度評価
Evaluation of the electrical contacts of thermal fatigue cracks across their surfaces 東北大院・工学研究科
著者:
遊佐 訓孝 Noritaka YUSA 橋爪 秀利 Hidetoshi HASHIZUME 王 晶 Jing WANG
発刊日:
公開日:
conductivityelectrical resistanceelectromagnetic nondestructive evaluationnumerical modeling
概要
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 cracks are actually not identical to electrical insulator whereas their electrical conduct ance is in general less than that of stress corrosion cracking. The results also demonstrated that the electrical contact of thermal fatigue cracks near crack tip tends to be larger than that near the surface.
