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김종현(JongHyoun Kim),윤송남(SongNam Yun),오승규(SeungKyu Oh),황영택(YeongTaik Hwang),정의섭(EuiSeob Jeong),이원(Won Yi) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The ultrasonic signals transmitted through adhesive bonded joint plates is used to evaluate parameters related to attenuation and frequency in the adhesive bonded joint. When variable thickness exists, the even frequencies in the ultrasonic spectrum are changed the frequency variation. The more materials thickness and the higher the frequency, the larger shift is observed. An FFT is developed to determine bond-layer parameters such as effective thickness and frequency for adhesive bonded joint AI 6061 plates in comparison with measured and theoretical ratios. Measured ratios for cases of bond thickness and variety bonding materials are then used to determine bond parameters. The results show that the technique can be applied to the characterization of adhesive bonded joint for light vehicle body.<br/>
오승규(SeoungKyu Oh),김종현(JongHyun Kim),장철섭(ChulSup Jang),황영택(YeongTaik Hwang),이원(Won Yi) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Application of bonding by adhesives can be found in many industries, particularly in advanced technological domains such as aeronautical and space, automobile and electronics industries. Periodic inspection with conventional ultrasonic NDE techniques is capable of indicating the presence and possible location of crack. Continuous ultrasonic attenuation monitoring has potential to supply information. This article discusses the use of pulse-echo ultrasonic testing for the inspection of adhesive bonds between metal sheets. The method is based on the measurement of the reflection coefficient at the metal/adhesive interface. By means of a control experiment it is shown that Quantitative Nondestructive Evaluation in Adhesive Joints are evaluated together with Ultrasonic Testing and Fracture Testing.