Feasibility Study on Surface Microcrack Detection of the Steel Wire Rods Using Electromagnetic Acoustic Resonance
전자기 음향 공진을 이용한 강선의 표면 미세 결함 탐상 타당성 연구

Taehoon Heo, Seung Hyun Cho, Bongyoung Ahn, Zhong Soo Lim
2013 Journal of the Korean Society for Nondestructive Testing  
The surface microcrack over a few tens of micrometers is one of severe problems of a steel wire rod to lead to the failure of the final products, so the method to evaluate crack depth has been required to develop. This work investigates the feasibility of electromagnetic acoustic resonance (EMAR) for this problem. EMAR is the method for measurement of resonant features using electromagnetic acoustic transducer (EMAT). Generally, EMAR is sensitive to small variation of the structures and easy to
more » ... uctures and easy to apply it to the industrial field because of the feature of noncontact measurement. Through several EMAR experiments, the change of the resonant frequencies and attenuation in reverberation has been observed. The results confirms that the surface cracks of around 100 micrometer depth can be detected successfully with the present method.
doi:10.7779/jksnt.2013.33.1.7 fatcat:54u5gucg3ze57ga2cjrd57mbfq