TOFD detection of bottom defects in aluminum alloy plate by half-skip mode wave

被引：0
|
作者：
Jin S. [1 ]
Wang Z. [1 ]
Tian X. [1 ]
Sun X. [1 ]
Lin L. [1 ]
机构：
[1] NDT & E Laboratory, Dalian University of Technology, Dalian
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 04期
基金：
中国国家自然科学基金;
关键词：
aluminum alloy; dead zone; half-skip mode wave; quantitative detection; Time-of-Flight Diffraction (TOFD);
D O I：
10.7527/S1000-6893.2021.26674
中图分类号：
学科分类号：
摘要：
When Time-of-Flight Diffraction（TOFD）technique is used to detect the bottom defects in the aluminum al⁃ loy plate，there is a near-surface dead zone under the effect of the pulse duration of lateral wave. In this paper，a TOFD half-skip mode wave method is proposed to reduce the dead zone. The characteristics of the diffracted wave of the first back-wall reflected wave at the defect tip and its symmetry in B-scan image are employed to derive the depth determination formula of bottom defect. Simulation and experiment results show that with the proposed method，the range of the near-surface dead zone is reduced by more than 64%，and the positioning errors of the defects with depth of no less than 2. 0 mm are within 6. 32% for the aluminum alloy plate with a thickness of 7. 0 mm by using the probes with 10 MHz center frequency and 40 mm probe center spacing. Compared to the mode-converted wave and the TOFD-W wave，the half-skip mode wave is decoupled with the back-wall wave and is close to the lateral wave，pre⁃ senting stronger applicability in detecting the bottom defect in aluminum alloy plate. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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