Affiliations: [a] Shaanxi Engineering Research Center for NDT and Structural Integrity Evaluation, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China | [b] Xinjiang Inspection Institute of Special Equipment, Urumqi 830011, Xinjiang, China
Correspondence:
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Corresponding author: Zhenmao Chen, Shaanxi Engineering Research Center of NDT and Structural Integrity Evaluation, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China. E-mail: [email protected].
Abstract: This paper presents numerical simulation results of eddy current signals to determine the appropriated dimensions of imitative stress-corrosion cracks (SCCs) in viewpoint of similar eddy current testing signals. The imitative SCCs were modelled as multiple tiny slits in three dimensions. A Finite Element and Boundary Element hybrid method (FEM-BEM) was utilized to simulate the eddy current signals in an impedance form of an absolute pancake coil. Equivalent conductivity (σE) of the imitative SCCs was estimated by using a uniform notch model at a fixed width of 0.2 mm, and adjusting the conductivity in the notch region. According to the numerical results, the impedance amplitude could be significantly used to quantify the σE of imitative SCCs. In addition, the variation of test frequency affecting to σE value was investigated. Finally, the appropriated imitative SCCs dimensions for the eddy current testing were quantitatively predicted by using a statistical methodology.
Keywords: Stress corrosion cracks, imitative SCC, eddy current testing, FEM-BEM
