CHO Hideo    Department   Aoyama Gakuin University  Department of Mechanical Engineering, College of Science and Engineering    Position   Professor
Language	English
Publication Date	2015/02
Type	Academic Journal
Peer Review	Peer reviewed
Title	Characterization of the bond quality of adhesive plates utilizing zero-group-velocity Lamb waves measured by a laser ultrasonics technique
Contribution Type	Collaboration
Author and coauthor	Hideo CHO, Yudai YAGUCHI and Hiroaki ITO
Details	The bonding quality of an adhesive component was estimated using the frequency of zero-group-velocity (ZGV) Lamb waves, which can be generated and detected with a laser ultrasonic technique. Two distinct peaks corresponding to ZGV Lamb waves in the amplitude spectrum were obtained for well- and weak-bonded adhesive plate samples. The frequency difference between the measured low frequency mode and the calculated frequency, which can be obtained by assuming a continuous stress and strain at a bonding interface, linearly increased with shear strength, as obtained by the shear-tensile test. The frequency of ZGV Lamb waves was also calculated with reduced shear modulus of the bonding layer to express a weak bonding, and the change in the calculated frequency in low frequency ZGV Lamb waves showed a similar tendency to that in measured one.