高温铝合金电磁超声SV波检测方法研究  

Study on Detecting Method of SV Wave Electromagnetic Ultrasonic in High-Temperature Aluminum Alloy

作　　者：付悦 李素军[2] 陈果 卢超[1] 李坚 李秋锋 彭健 FU Yue;LI Sujun;CHEN Guo;LU Chao;LI Jian;LI Qiufeng;PENG Jian(College of Measurement and Optoelectronic Engineering,Nanchang Hangkong University,Nanchang Jiangxi 330063,China;China Special Equipment Inspection and Research Institute,Beijing 100029,China)

机构地区：[1]南昌航空大学测试与光电工程学院,江西南昌330063 [2]中国特种设备检测研究院,北京100029

出　　处：《传感技术学报》2023年第3期380-388,共9页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金项目(11764030,51705232);江西省教育厅科学技术研究项目(GJJ191627)。

摘　　要：建立斜入射垂直剪切(Shear vertical,SV)波在高温铝合金金属材料中的声场分析和瞬态传播有限元模型,研究了斜入射SV波在高温铝合金中的声场特性和传播规律。设计并制作了耐高温斜入射SV波电磁超声探头,对铝合金试块底部长20 mm×宽1 mm×高1 mm的人工U型槽在20℃~450℃高温条件下进行检测。研究结果表明,随着温度的升高,斜入射SV波的入射角逐渐减小,主瓣宽度先增大再减小,主旁瓣比依次递减,缺陷回波的飞行时间增加,回波幅值呈现先增加后减小的趋势。The finite element model of the transient transmission and acoustic analysis of angled shear-vertical(SV)wave in high-temperature aluminum alloy material are established.The acoustic field characteristics and propagation law of angled SV waves in high-temperature aluminum alloy material are studied.A heat-resistant angled SV wave electromagnetic acoustic transducer(EMAT)is designed and fabricated to detect an artificial U-groove with a length of 20 mm,a width of 1 mm,and a depth of 1 mm at the bottom of the aluminum alloy test block at 20℃~450℃.Results show that with the increase in temperature,the incident angle of the SV wave decreases gradually,and the main lobe width increases firstly and then decreases.Then the main-to-side-lobe ratio decreases in sequence,the time-of-flight of the defect echo increases,and the echo amplitude increases at first and then decreases.

关 键 词：电磁超声换能器 声场特性 斜入射SV波 有限元法 高温检测 铝合金 

分 类 号：TB552[理学—物理] TH878[理学—声学]