摘要
探究了基于内检式电磁超声导波检测的金属小径管外壁裂纹定量评估方法。基于三维有限元仿真,在确定激励中心频率和激励波形的基础上,对金属小径管的超声导波检测进行数值仿真,通过改变裂纹缺陷的长度和径向深度,分析并获取检测信号对外壁裂纹的响应特性及规律。同时,搭建管件电磁超声导波检测试验平台,获取管件不同尺寸缺陷的电磁超声导波检测响应信号。试验结果表明,管件外壁裂纹深度越深,检测信号中的缺陷回波面积越大,内检式电磁超声导波可有效对金属小径管外壁裂纹进行定量检测。
The bobbin-typed guided-wave electromagnetic acoustic transduction(GW-EMAT) is intensively investigated for detection and assessment of external cracks in small-diameter metallic tubes(SMTs). Based on 3D finite element analysis, the central frequency and waveform of the GW-EMAT excitation are sought. Series of simulations regarding GW-EMAT inspection of SMT have been conducted. The characteristics and relation of the signal response to the external crack are obtained and analyzed by changing the circumferential length and radial depth of the crack. Meanwhile, a GW-EMAT testing system is built up. The experimental signals of cracks in different sizes are acquired and scrutinized. From the investigation results, it can be found that the area of the crack echo increases as the crack depth rises, indicating the feasibility of bobbin-typed GW-EMAT for detecting and evaluating the external cracks in SMTs.
作者
李孟奇
李勇
苏冰洁
刘天浩
裴翠祥
陈振茂
LI Mengqi;LI Yong;SU Bingjie;LIU Tianhao;PEI Cuixiang;CHEN Zhenmao(State Key Laboratory for Strength and Vibration of Mechanical Structures,Shaanxi Engineering Research Centre of NDT and Structural Integrity Evaluation,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《无损检测》
CAS
2022年第10期1-5,51,共6页
Nondestructive Testing
基金
国家磁约束核聚变能发展研究专项(2019YFE03130003)
国家自然科学基金项目(51777149,11927801)
国家重点研发项目(2017YFF0209703)。
关键词
电磁超声导波检测
金属小径管
缺陷特征
定量评估
guided-wave electromagnetic acoustic transduction
small-diameter metallic tube
defect characteristics
quantitative evaluation
