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首页> 外文期刊>International Journal of Precision Engineering and Manufacturing >Evaluation of Defect Detection in Aluminium, CFRP and Epoxy Resin Plates Using Non-contact Air-Coupled Ultrasonic Waves
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Evaluation of Defect Detection in Aluminium, CFRP and Epoxy Resin Plates Using Non-contact Air-Coupled Ultrasonic Waves

机译：使用非接触式空气耦合超声波评估铝，CFRP和环氧树脂板中的缺陷检测

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摘要

In the field of aerospace materials and structures, water coupled ultrasonic testing was not desirable due to changes in properties and contamination reason. Therefore, in the present study non-contact air coupled ultrasonic transducers were proposed as an alternative examination for such applications. This present study describes our practical knowledge of using piezoelectric air-coupled transducers for visualization and defect identification of aluminium, CFRP and epoxy-resin specimens. Further, the effectiveness of the system is verified by experiments conducted in the inspection of artificial defects and 2D images was reconstructed through scanning of specific specimen surface. Results show that, all the created defects were identified successfully using C-scan technique. The measured defect values were compared with experimental defect values and shows good agreement. The 1 MHz piezoelectric transducer was the best for all the three specimens which is used in the present study because of the material structure being evaluated. The bulk wave piezoelectric transducer was identified as extensive pulse attenuation by the structure of the aluminium, CFRP and epoxy resin.
机译：在航空航天材料和结构领域，由于性质和污染原因的变化，水耦合超声检测是不可取的。因此，在本研究中，提出了非接触式超声换能器作为这种应用的替代检查。本研究描述了我们使用压电空气耦合换能器进行可视化和缺陷鉴定铝，CFRP和环氧树脂样本的实际知识。此外，通过在检查人工缺陷检查中进行的实验验证系统的有效性，通过扫描特定样品表面重建2D图像。结果表明，使用C扫描技术成功识别所有创建的缺陷。将测量的缺陷值与实验缺陷值进行比较并显示出良好的一致性。由于评估的材料结构，1MHz压电传感器是本研究中使用的所有三种样本最佳的。通过铝，CFRP和环氧树脂的结构鉴定为广泛的脉冲衰减。

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