渦電流探傷試験における熱疲労割れの数値モデリング

英字タイトル:
Numerical modeling of thermal fatigue cracks from the viewpoint of eddy current testing
著者:
遊佐訓孝 Noritaka YUSA 橋爪秀利 Hidetoshi HASHIZUME Iikka VIRKKUNEN Mika KEMPPAINEN
発刊日: 2012年10月 1日
公開日: 2019年3月 6日

カテゴリ: 論文

キーワードタグ:
conductivityelectromagnetic nondestructive evaluationfinite element methodnumerical simulation

概要

Abstract. This study discusses a suitable numerical modeling of a thermal fatigue crack from the viewpoint of eddy current testing. Five artificial thermal fatigue cracks, introduced into type 304L austenitic stainless steel plates with a thickness of 25 mm, are prepared; and eddy current inspections are carried out to gather signals using an absolute type pancake probe and a differential type plus point probe. Finite element simulations are then carried out to evaluate a proper numerical model of the thermal fatigue cracks. In the finite element simulations, the thermal fatigue cracks are modeled as a semi-elliptic planar region on the basis of the results of the destructive tests. The width and internal conductivity are evaluated by the simulations. The results of the simulations reveal that the thermal fatigue cracks are regarded as almost nonconductive when the internal conductivity is assumed to be uniform inside.