Title: Ultrasonic zero-lag cross correlation based on frequency-wavenumber domain analysis for internal delamination detection

Authors: Zhiqi Shen; Yun-Kyu An; Zhishen Wu

Addresses: International Institute for Urban Systems Engineering, Southeast University, Nanjing, 210096, China ' Department of Architectural Engineering, Sejong University, Seoul, 143-747, Republic of Korea; International Institute for Urban Systems Engineering, Southeast University, Nanjing, 210096, China ' International Institute for Urban Systems Engineering, Southeast University, Nanjing, 210096, China; Department of Urban and Civil Engineering, Ibaraki University, Hitachi, 316-8511, Japan

Abstract: This paper proposes a zero-lag cross correlation (ZLCC) method based on frequency-wavenumber (f-k) domain analysis for internal delamination detection in composite structures. The proposed ZLCC method is able to identify and localise hidden delamination inside composite layers without relying on baseline data accumulated from the pristine condition of a target structure, making it possible to minimise false alarms caused by environmental effects. The ZLCC method is theoretically developed by investigating the physical relationship between ZLCC and ultrasonic wave interaction with delamination. Then, it is numerically validated using a 2D finite element model. The finite element analysis results reveal that internal delamination is successfully localised and highlighted by ZLCC.

Keywords: ultrasonic; zero-lag cross correlation; ZLCC; standing wave; composite structures; structural health monitoring; SHM; non-destructive testing; NDT.

DOI: 10.1504/IJSMSS.2017.092247

International Journal of Sustainable Materials and Structural Systems, 2017 Vol.3 No.1, pp.1 - 12

Available online: 28 May 2018 *

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