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首页> 外文期刊>International journal of applied electromagnetics and mechanics >A rotating bias magnetic field EMAT and applications to NDT of ITER divertor components
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A rotating bias magnetic field EMAT and applications to NDT of ITER divertor components

机译：旋转偏置磁场EMAT及其在ITER分流器组件无损检测中的应用

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摘要

In this paper, an electromagnetic acoustic transducer (EMAT) method using rotating bias magnetic field was proposed for NDT of delamination defect in a thin multilayer tube of W-Cu monoblock in ITER divertor. To investigate its feasibility, a numerical simulation code was developed for EMAT signal simulation of tube configuration and uniform bias magnetic field. The EMAT signals of a typical EMAT transducer under bias magnetic field applied outside the tube were simulated for deboning defect of different size in the W-Cu interface of the mono-block. The reasonable sound speed and simple dependence of the signal amplitude on defect size demonstrated that the developed code is efficient and the proposed rotating bias field EMAT is feasible for inspecting delamination defect in thin multilayer tubes. In addition, an experiment was carried out to investigate the influence of the rotating speed on the EMAT signals. It is found that a normal rotation speed does not give significant influence on the EMAT signals, which further support the validity of the rotating bias field EMAT.
机译：本文提出了一种利用旋转偏置磁场的电磁声换能器（EMAT）方法对ITER分流器中W-Cu单块薄多层管中的分层缺陷进行无损检测。为了研究其可行性，开发了一个数字仿真代码，用于对管配置和均匀偏置磁场进行EMAT信号仿真。模拟了典型EMAT换能器在管子外部施加的偏置磁场下的EMAT信号，以分析整体式W-Cu界面中不同尺寸的去骨缺陷。合理的声速和信号幅度对缺陷尺寸的简单依赖性表明，所开发的代码是有效的，并且所提出的旋转偏置场EMAT对于检查薄多层管中的分层缺陷是可行的。另外，进行了实验以研究转速对EMAT信号的影响。发现正常转速不会对EMAT信号产生显着影响，这进一步支持了旋转偏置磁场EMAT的有效性。

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