A Fracture Mechanics Approach to Adhesively Bonded Joint Using Ultrasonic Signal Analysis

Han, JunYoung; Oh, SeungKyu; Yun, SongNam; Lee, Won; Jang, ChulSup; Kim, MinGun; Kim, HwanTae

Journal of KWJS 2003;21(5):77-82.
Published online September 25, 2003.

[연구논문]초음파 신호분석을 이용한 접착접합 이음의 파괴역학적 평가

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A Fracture Mechanics Approach to Adhesively Bonded Joint Using Ultrasonic Signal Analysis

JunYoung Han, SeungKyu Oh, SongNam Yun, Won Lee, ChulSup Jang, MinGun Kim, HwanTae Kim

Abstract

In automobile industry, it is necessary to reduce the weight from the view point of energy and environmental problems in these days. One of the ways for weight reduction is using adhesive aluminum structures. In this study, ultrasonic signals reflected from the adhesively bonded joint layer are used to evaluate the adhesively bonded joints. FFT is performed to determine bond-layer parameters such as effective thickness and frequency for adhesively bonded joint Al 6061 plates in comparison with the measured and theoretical ratios. And the parameters of ultrasonic wave and the J-integral are investigated to evaluate the adhesively bonded joint strength by DCB specimens.