International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428615100187

Numerical Modeling of Thermal Fatigue Crack from View Point of Eddy Current Testing

Jing Wang^1,a, Noritaka Yusa¹, Mika Kemppainen², Iikka Virkkunen² and Hidetoshi Hashizume^{1 1}Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6 Aramaki Aza Aoba, Aoba-Ku, Sendai, Miyagi 980-8579. ^ajingwang8604@gmail.com ²Trueflaw Ltd, Tillinm̻entie 3, tila A113, 02330 Espoo, Finland.

ABSTRACT

This study evaluates the numerical modeling of thermal fatigue crack from the viewpoint of eddy current testing. Four relative small thermal fatigue cracks are artificially introduced into a type 316 stainless steel plate, and their eddy current signals were measured using a differential type plus point probe. Subsequent numerical simulations model each crack as a region with constant width, uniform conductivity and true profile shown by destructive tests. Analyzing the study together with earlier publications indicates that thermal fatigue crack should be modeled as an almost non-conductive region in a general sense, no matter what are frequency, size of crack and base material.

Keywords: Eddy current testing, Numerical modeling, Thermal fatigue crack.

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