Imaging wall thinning defect by electromagnetic ultrasonic shear horizontal guided wave tomography

Issue title: Proceedings from the 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2015)

Guest editors: Fumio Kojima, Futoshi Kobayashi and Hiroyuki Nakamoto

Article type: Research Article

Authors: Li, Weibin^{a; *} | Cho, Younho^{b; *}

Affiliations: [a] School of Aerospace Engineering, Xiamen University, Xiamen, Fujian, China | [b] School of Mechanical Engineering, Pusan National University, Jangjeon-dong, Geumjeong-gu, Busan, Korea

Correspondence: [*] Corresponding authors: Weibin Li, Xiamen University, China. E-mail: [email protected]; Younho Cho, Pusan National University, Korea. E-mail: [email protected]

Abstract: Ultrasonic guided wave tomography provides an imaging potential over a hidden and inaccessible damage zone. The use of shear horizontal guided waves has been proposed as an attractive technique for surface defect characterization. In this paper, imaging of wall thinning defects in plate is investigated by using electromagnetic ultrasonic shear horizontal guided wave tomography. Shear horizontal guided waves are generated and measured by magnetostrictive patch transducers. The quantification via imaging of wall thinning defects is achieved by a modified reconstruction algorithm for the probabilistic inspection of damage tomography algorithm. The location and shape of wall thinning defects are successfully obtained by the electromagnetic ultrasonic wave signals. The present approach provides an alternative alternative, that can be applied for detecting, locating and imaging the wall thinning defects in plate-like structures.

Keywords: Electromagnetic ultrasonics, shear horizontal guided waves, tomographic imaging

DOI: 10.3233/JAE-162033

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 323-330, 2016