Principle of Integrating Electromagnetically Induced Acoustic Emission with Electromagnetic Ultrasonic Testing and Design of Exciting Coil
Cai Zhichao1,Liu Suzhen1,Jin Liang2,Zhang Chuang1,Yang Qingxin1,2
1. Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability Hebei University of Technology Tianjin 300130 China 2.Key Laboratory of Advanced Electrical Engineering and Energy Technology Tianjin Polytechnic University Tianjin 300387 China
Abstract：The brittle and fatigue fracture caused by micro-crack and fatigue damage often happen suddenly in the aluminum alloy plate surface,and even results in a catastrophic accident. A composite nondestructive testing (NDT) method is presented which integrates electromagnetically induced acoustic emission (EMAE) with electromagnetic acoustic transducer (EMAT). The surface and sub-surface defects can be detected by this nondestructive method without adding the special exciting circuits and coils. This method makes up for the inadequate and unreliable detection in the key position by a single detection. The exciting coil of the composite nondestructive testing method is designed which suits to EMAE and EMAT. The finite element method (FEM) is used for the simulation. The simulation results show that the proposed coil model is valid for application.
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2013, Vol. 28 
