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首页> 外文期刊>NDT & E international >Investigating vibration characteristics of magnetostrictive transducers for air-coupled ultrasonic NDT of composites
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Investigating vibration characteristics of magnetostrictive transducers for air-coupled ultrasonic NDT of composites

机译：复合材料空气耦合超声无损检测的磁致伸缩换能器振动特性研究

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摘要

In this study, high-power ultrasonics has been used for non-contact nondestructive testing of composites. Air coupled magnetostrictive ultrasonic transducers provide reasonable amplitudes of horn oscillations even if this type of ultrasonic stimulation is close to the idle mode. Four types of ultrasonic horns have been designed and manufactured in order to choose an optimal horn configuration. For each horn, the dependence of vibration amplitude on ultrasonic unit power has been found to exhibit a good match between the theoretical and experimental results. The resonance frequencies and amplitudes of oscillatory velocity were experimentally evaluated by using the technique of scanning laser vibrometry and modeled by means of the Autodesk Inventor software. An air-coupled magnetostrictive transducer, in conjunction with an optimized horn, has been used in the evaluation of impact damage in a graphite epoxy composite and detection of water and excessive epoxy adhesive in an aviation honeycomb panel. It is expected that the technique of air-coupled ultrasonics may be useful for inspecting thin, fragile and hydrophilic materials.
机译：在这项研究中，高功率超声波已用于复合材料的非接触式无损检测。空气耦合磁致伸缩超声换能器即使在这种类型的超声刺激接近于空闲模式的情况下，也能提供合理的喇叭振动幅度。为了选择最佳的喇叭配置，已经设计和制造了四种类型的超声波喇叭。对于每个喇叭，已经发现振动幅度对超声单位功率的依赖性在理论和实验结果之间显示出良好的匹配。共振频率和振荡速度的振幅通过使用扫描激光振动测定技术进行了实验评估，并通过Autodesk Inventor软件进行了建模。空气耦合的磁致伸缩换能器与优化的喇叭相结合，已用于评估石墨环氧复合材料的冲击损伤，并检测航空蜂窝板中的水和过量的环氧粘合剂。期望空气耦合超声技术可用于检查薄，易碎和亲水的材料。

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