Sizing of long stress corrosion crack from 2D ECT signals by using a multisegment inverse analysis strategy

Issue title: Selected Papers from the 13th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2007)

Article type: Research Article

Authors: Wang, Li^a | Chen, Zhenmao^{a; *} | Lu, Tian-Jian^a | Xu, Minglong^a | Yusa, Noritaka^b | Miya, Kenzo^b

Affiliations: [a] MOE Key Laboratory for Strength and Vibration, Xian Jiaotong University, 28 West Xianning Road, Xian,710049, P.R. China | [b] International Institute of Universality, 2-7-17 Ikenohata, Taito-ku, Tokyo, 110-0008, Japan

Correspondence: [*] Corresponding author. Tel.: +86 29 82663266; E-mail: [email protected]

Abstract: In this paper, a scheme for reconstruction of a long Stress Corrosion Crack (SCC) from 2D ECT signals is proposed based on a multiple crack segments strategy. The profiles of inner and edge crack segments are reconstructed separately by using signals at different scanning direction. A hybrid scheme of the Conjugate Gradient (CG) method and the advance-retreat method are introduced to reconstruct the crack conductivity and crack size. Several cracks of complicated profile are reconstructed from simulated ECT signals of a conductive SCC model. The numerical results verified the validity of the proposed scheme.

Keywords: Multisegment ECT inversion, long stress corrosion crack, 2D signal simulation, hybrid inversion method

DOI: 10.3233/JAE-2008-971

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 28, no. 1-2, pp. 155-161, 2008