Title :
Characterization of adhesively bonded laminates using non-linear acoustics
Author :
Batra, N.K. ; Delsanto, P.P. ; Agostini, V. ; Scalerandi, M.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
Abstract :
Several bonded specimens of glass-glass, composite-composite materials containing various debonds have been fabricated. To characterize these specimens for debonds detection and evaluation, a 5.0 MHz focussed ultrasonic transducer is used to aim an ultrasonic pulse of large amplitude to the bond line. The back-scattered signal is Fourier-analyzed to observe the generation of higher harmonics. The measured non-linearity parameters reveal the presence of classical and/or nonclassical effects, according to the slope of the odd harmonics vs. the amplitude of the driving signal. Mapping of these effects is used to characterize the quality of the interfacial bonding
Keywords :
Fourier analysis; adhesion; harmonic generation; laminates; nonlinear acoustics; ultrasonic materials testing; 5.0 MHz; Fourier analysis; composite-composite material; debond detection; focused ultrasonic transducer; glass-glass material; harmonic generation; interfacial adhesive bonding; laminate; nonlinear acoustics; ultrasonic NDE; ultrasonic backscattering; Acoustic waves; Bonding; Hysteresis; Laminates; Nonlinear acoustics; Nonlinear equations; Nonlinear optics; Optical transmitters; Signal generators; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2000 IEEE
Conference_Location :
San Juan
Print_ISBN :
0-7803-6365-5
DOI :
10.1109/ULTSYM.2000.922657
