High-frequency guided waves for defect detection in stiffened plate structures
High-frequency guided waves for defect detection in stiffened plate structures
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DOI：
10.1784/insi.2009.51.12.667
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发表时间：
2009-12
期刊：
影响因子：
1.1
通讯作者：
B. Masserey;P. Fromme
中科院分区：
文献类型：
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作者：
B. Masserey;P. Fromme
研究了一种特殊类型的高频导波（耦合类瑞利波）在飞机结构无损检测中的应用。类瑞利波在板的两侧之间传递能量，并且对于检测和定位板状结构的两面的小缺陷具有良好的灵敏度。采用时域和频域相结合的评价方法，可以准确地确定缺陷的位置和受损板的侧面。可以使用脉冲回波配置中的标准瑞利波楔形换能器来激发和测量波。由于拍频现象，类瑞利波可以传播经过具有表面缺陷或特征的区域。这允许远程检测受结构特征限制的区域中的缺陷，例如加强件和纵梁。通过选择适当的激励频率和位置，能量的很大一部分可以在障碍物后面传输并在缺陷处反射，从而允许检测。这已经在实验中得到证实，其中通过标准脉冲回波测量在多个加强件后面检测到表面槽。从有限差分（F-D）模拟和检测灵敏度，不同的缺陷位置和深度的测量信号进行了验证。
The use of a special type of high-frequency guided ultrasonic wave (coupled Rayleigh-like waves) has been investigated with a view towards applications for the non-destructive testing of aircraft structures. Rayleigh-like waves tran, fer energy between the plate sides and have good sensitivity for the detection and localisation of small defects oil both sin faces of a plate-like structure. Using a combination of evaluation in the time and frequency domain, the defect location and damaged plate side can be accurately determined. The waves can be excited and measured using standard Rayleigh wave wedge transducers in a pulse-echo configuration,Due to the beating phenomenon, the Rayleigh-like wave can propagate past regions with surface defects or features. This allows for the remote detection of defects in areas where access is restricted by structural features, such as stiffeners and stringers. By selecting appropriate excitation frequency, and position, a significant part of the energy can be transmitted behind the obstacle and reflected at the defect, allowing detection. This has been shown experimentally, where surface slots were detected behind multiple stiffeners by standard pulse-echo measurements. The measured signals were verified from Finite Difference (F-D) simulations and the detection sensitivity,for different defect locations and depths has been discussed.