Title :
Use of focussed ultrasonic beams to characterize the interfacial region in bonded joints
Author :
Moidu, Abduljaleel K. ; Sindair, A.N. ; Spelt, Jan K.
Author_Institution :
Dept. of Mech. Eng., Toronto Univ., Ont., Canada
Abstract :
A model is presented for an ultrasonic pitch-catch immersion measurement system for nondestructive characterization of the interfacial region in bonded joints using focused beams. The adhesion between the adhesive and the adherend is modeled by means of interfacial springs. The model predicts that the reflected signal becomes strongly frequency dependent as the aperture angle is increased for a fixed probe diameter. It is shown that the frequency dependence is due to interference between the various angular components of the beam. This phenomenon leads to a strong dependence in the spectral response of the system to the condition of the interfacial region
Keywords :
adhesion; ultrasonic focusing; ultrasonic materials testing; ultrasonic reflection; adherend; adhesion; adhesive; angular components; aperture angle; bonded joints; fixed probe diameter; focussed ultrasonic beams; frequency dependence; interfacial region; interfacial springs; nondestructive characterization; reflected signal; spectral response; ultrasonic pitch-catch immersion measurement system; Adhesives; Apertures; Bonding; Frequency measurement; Mechanical engineering; Mechanical variables measurement; Optical reflection; Probes; Springs; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495681
