| 姜颖,郭新峰,项延训.SH电磁超声换能器优化设计及粘接强度测量[J].声学技术,2023,42(5):695~700 |
| SH电磁超声换能器优化设计及粘接强度测量 |
| Optimization design of SH-wave electromagnetic ultrasound transducer and bonding quality evaluation |
| 投稿时间：2022-04-08 修订日期：2022-04-22 |
| DOI：10.16300/j.cnki.1000-3630.2023.05.021 |
| 中文关键词: 电磁超声换能器(EMAT) 换能效率 SH0导波 粘接强度 |
| 英文关键词: electromagnetic acoustic transducer (EMAT) conversion efficiency SH0 guided waves bonding strength |
| 基金项目:国家重点研发计划项目(2021YFC30018002);国家自然科学基金项目(U1930202,12025403)。 |
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| 中文摘要: |
| 电磁超声换能器(Electromagnetic Acoustic Transducer,EMAT)使用时无需耦合剂，可以便捷地应用于严苛工况下结构的超声检测。但由于EMAT复杂的多物理场换能机理，通常存在换能效率低，接收信号信噪比小等缺点。针对上述问题，文章开展了线圈宽度、线圈间距及磁致伸缩贴片等参数对EMAT换能效率的影响研究，优化设计了SH电磁超声换能器。实验结果表明，一定厚度的磁致伸缩贴片对EMAT的换能效率有较明显的提高。基于SH0导波对界面变化的敏感性，采用优化设计的EMAT激发SH0导波，对固化温度等因素引起的多层铝板弱粘接结构件进行粘接性能的检测，实验测得的粘接强度与结构拉伸强度的变化趋势一致，表明优化后的EMAT可以适用于粘接结构状态的检测。 |
| 英文摘要: |
| Electromagnetic acoustic transducer (EMAT) can be used without coupling agent, which makes it convenient to apply to ultrasonic inspection of structures under severe conditions. However, due to the complex multiphysics field energy conversion mechanism of EMAT, usually there are disadvantages such as low energy conversion efficiency and low signal-to-noise ratio of the received signal. In view of the above problems, a study of the effects of several parameters such as coil width, coil spacing and magnetostrictive patch on the energy conversion efficiency of EMAT is made in this paper, and the design of the SH electromagnetic ultrasonic transducer is optimized. The experimental results show that a certain thickness of magnetostrictive patch has a gain effect on the transduction efficiency of EMAT. Based on the sensitivity of SH0 guide wave to interface change, the optimized EMAT is used to detect the bounding performance of weakly adhesive structural parts of multilayer aluminum plates caused by curing temperature and other factors. The experimentally measured adhesive strengths are consistent with the changing trend of structural tensile strengths, which indicates that the optimized EMAT can be applied to the detection of bonded structural states. |
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