Affiliations: [a] MOE Key laboratory for Strength and Vibration,Xian
Jiaotong University, Xian, China
Correspondence:
[*]
Corresponding author: Zhenmao Chen, MOE Key laboratory for
Strength and Vibration,Xian Jiaotong University, 28 West Xianning Road, Xian,
710049, China. Tel.: +86 29 82668736; E-mail: chenzm@mail.xjtu.edu.cn
Abstract: The feasibility of Eddy Current Testing (ECT) for the nondestructive
evaluation of cellular metallic materials is investigated. The inspection
target is focused on the welding joints connecting the surface and inner layers
of a typical cellular material – metallic sandwich plate. Through
numerical simulations, it is found that the defects in the welding zone cause
ECT signals of significant different phase property with those caused by
welding bead. The multi-frequency signal processing algorithm (MFA) is used to
process the signals in order to improve the S/N ratio, which enables the
recognition of crack indication from the mixed signals of welding joint. In
addition, through profile reconstruction of a crack in the welding zone by
means of a deterministic inverse analysis and MFA, it is demonstrated that ECT
is a suitable quantitative NDE technique for the matrix sandwich material.
Keywords: Cellular metallic materials, eddy current testing, welding zone cracks, multi-frequency algorithm, inverse analysis
