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http://www.dbpia.co.kr/Journal/ArticleDetail/NODE02470944

 

비파괴검사학회지 제34권 제4호, 2014.8, 277-282 (6 pages)

금속 재료의 잠닉손상 평가를 위한 비선형 전자기음향공진 기법에 관한 연구

Study on the Nonlinear Electromagnetic Acoustic Resonance Method for the Evaluation of Hidden Damage in a Metallic Material
조승완, 조승현, 박춘수, 서대철, 장경영
한국어 초록
최근 전통적 초음파기법이 탐상할 수 없는 잠닉손상을 평가할 수 있는 잠재적 기술로서 비선형 초음파기법들에 대한 많은 관심이 있다. 비선형 초음파기법중 하나인 공진주파수 변화를 이용하는 기법은 재료의 탄성영역에서의 이력에 근거한 기술이다. 공진주파수의 변화량이 아주 작기 때문에 정교한 공진주파수 측정장치가 필요하다. 본 연구에서는 비선형 전자기음향공진기법을 적용하였다. 비선형 전자기음향공진기법은 비접촉 EMAT 센서를 사용하기 때문에 재료의 주파수 응답에 영향을 최소화할 수 있다. 3점 굽힘 피로시험을 한 알루미늄판 시편에 횡파 EMAT으로 실험을 실시하였다. 전압을 여러 레벨로 인가하며 공진을 발생시켜 잠닉손상측정에 중요한 요인중 하나인 이력 비선형 파라미터 ⍺를 공진주파수 변화로부터 산출하였다. 비손상시편과 손상시편에서의 측정된 이력 비선형 인자의 값이 서로 차이가 남을 확인하였다.
영어 초록
Recently, much attention has been paid to nonlinear ultrasonic technology as a potential tool to assess hidden damages that cannot be detected by conventional ultrasonic testing. One nonlinear ultrasonic technique is measurement of the resonance frequency shift, which is based on the hysteresis of the material elasticity. Sophisticated measurement of resonance frequency is required, because the change in resonance frequency is usually quite small. In this investigation, the nonlinear electromagnetic acoustic resonance (NEMAR) method was employed. The NEMAR method uses noncontact electromagnetic acoustic transducers (EMATs) in order to minimize the effect of the transducer on the frequency response of the object. Aluminum plate specimens that underwent three point bending fatigue were tested with a shear wave EMAT. The hysteretic nonlinear parameter ⍺, a key indicator of damage, was calculated from the resonance frequency shift at several levels of input voltage. The hysteretic nonlinear parameter of a damaged sample was compared to that of an intact one, showing a difference in the values.

분류 제목 조회 수
International Assessment of Thermal Degradation by Cumulative Variation of Ultrasonic Nonlinear Parameter     2486
International Assessment of Thermal Aging of Aluminum Alloys by Acoustic Nonlinearity Measurement of Surface Acoustic Waves     2401
International Absolute Measurement and Relative Measurement of Ultrasonic Nonlinear Parameter     2429
International Experimental Comparison of Nonlinear Parameters Obtained from Absolute Measurement and Relative Measurement     2129
International Comparison of Ultrasonic Nonlinear Parameters Measured by PZT and LiNbO3 Transducers     2231
International Nanotribological and wetting performance of hierarchical patterns     4411
International Demonstration of Disturbance Propagation and Amplification in Car-Following Situation for Enhancement of Vehicle Platoon System     4899
International Relative Measurement of Acoustic Nonlinear Parameters and Comparison of Sensitivity to Thermal Aging     4568
International Non-contact Measurement of Elastic Modulus by using Laser Ultrasonic     5923
International Relationship between Second- and Third-order Acoustic Nonlinear Parameters in Relative Measurement     4707
International Non-Contact Evaluation of Acoustic Nonlinearity of a Laser-Generated Surface Wave in a Plastically Deformed Aluminum Alloy     4578
International Influence of repetitive pulsed laser irradiation on the surface characteristics of an aluminum alloy in the melting regime     4630
International Real-time detection of surface cracks on silicon wafers during laser beam irradiation     4641
Domestic High power CW laser-induced damage of CMOS image sensor     4990
Domestic Measurement of Ultrasonic Nonlinear Parameter by Using Non-Contact Ultrasonic Receiver     4997
Domestic Study on the Nonlinear Electromagnetic Acoustic Resonance Method for the Evaluation of Hidden Damage in a Metallic Material     4853
International Influence of laser beam profiles on the frequency bandwidth of laser-generated surface acoustic waves     4583
International Laser ultrasonic inspection in ablation regime     4485
International Improvement of Crack Sizing Performance by using Nonlinear Ultrasonic Technique     4547
International In-Line Ultrasonic Monitoring for Sediments Stuck on Inner Wall of a Polyvinyl Chloride Pipe     13443
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