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首页> 外文会议>Conference on health monitoring of structural and biological systems >Detection of surface breaking fatigue crack on a complex aircraft structure with Rayleigh surface waves
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Detection of surface breaking fatigue crack on a complex aircraft structure with Rayleigh surface waves

机译：利用瑞利面波检测复杂飞机结构的表面破坏疲劳裂纹

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As part of an on-going, multi-year effort focused on developing a practical structural health monitoring (SHM) sensor for critical structural components in aircraft, a miniature Rayleigh surface wave sensor has been developed and tested. The sensor was specifically designed to detect localized, deterministic cracking in targeted locations in critical locations where fatigue cracking is prevalent. A representative aircraft component was used in the present investigation. Miniature interdigital transducers (IDTs) operating in the low megahertz frequency range were designed, fabricated, and tested on compact tension (CT) fatigue specimens in the laboratory before they were strategically placed on the structure, where surface wave signals were monitored in both pitch-catch and pulse-echo detection modes simultaneously. Under a high-cycle fatigue loading to the structure, the IDT sensors performed well with three of the sensors successfully detecting the existence of a critical fatigue crack. Visual and eddy current inspection methods subsequently verified the presence of the crack and its location. In this paper, the entire effort from the design and characterization of the IDT sensors to the final fatigue test on an actual aircraft part is discussed.
机译：作为正在进行的多年努力的一部分，致力于为飞机的关键结构部件开发实用的结构健康监测（SHM）传感器，已经开发并测试了微型瑞利表面波传感器。该传感器经过专门设计，可在疲劳裂纹普遍存在的关键位置的目标位置检测局部确定性裂纹。在本次调查中使用了具有代表性的飞机部件。在策略性地将其放置在结构上之前，已在实验室对紧凑张力（CT）疲劳样本进行设计，制造和测试了在低兆赫兹频率范围内运行的微型叉指式换能器（IDT），在该结构中，在两个音高下都对表面波信号进行了监测。捕获和脉冲回波检测模式同时进行。在结构的高周疲劳载荷下，IDT传感器表现出色，其中三个传感器成功检测到严重疲劳裂纹的存在。目视和涡流检查方法随后验证了裂纹的存在及其位置。在本文中，讨论了从IDT传感器的设计和表征到飞机实际零件的最终疲劳测试的全部工作。

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