TOFD detection of shallow subsurface defects in aluminum alloy thin plates by half-skip mode-converted wave

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外文摘要：Aluminum alloy is widely applied to the aerospace field.However,the inspection of thin plates using Time-of-Flight Diffraction(TOFD)technique is restricted by the near-surface dead zone because of the coupling between diffracted longitudinal wave and lateral wave.The half-skip mode-converted wave is introduced to decrease dead zone and detect defects in aluminum alloy thin plates by increasing ray path and propagation time.The quantitative correlation for the dif-fracted shear wave from longitudinal back-wall wave is deduced in combination with the acoustic path,realizing the accurate location of shallow subsurface defects.Simulated and experimental results indicate that the dead zone is decreased by 38％by the half-skip mode-converted wave,and the location errors are within 5％for the aluminum alloy plate with a thickness of 7.0 mm.Compared to other alternative TOFD techniques,half-skip mode-converted wave has better response amplitude and positioning accuracy,demonstrating strong applicability in TOFD inspec-tion of thin plates.

外文关键词：

Ultrasonic testingTime-of-Flight Diffraction(TOFD)Dead zoneHalf-skip mode-converted waveQuantitative detection

作者：

Shijie JIN、Zhicheng WANG、Zhongbing LUO

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作者单位：

NDT & E Laboratory,Dalian University of Technology,Dalian 116085,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

2019YFA07090035227552051775087

出版年：

2024

DOI：

10.1016/j.cja.2024.03.047

中国航空学报(英文版)

中国航空学会

中国航空学报(英文版)

CSTPCDEI

影响因子：0.847

ISSN：1000-9361

年,卷(期)：2024.37(6)

参考文献量3