Title :
Nonlinear NDE using contact acoustic nonlinearity (CAN)
fDate :
Oct. 31 1994-Nov. 3 1994
Abstract :
Acoustic nonlinear properties of a nonbonded solid-state contact compressed by a static load were studied experimentally. Main attention was paid to a “flapping” CAN mechanism attributed to the contact discontinuity caused by an acoustic wave. Sub- and super- harmonic generation and chaotic CAN behavior were registered in the experiment. CAN was shown to be responsible for an efficient nonlinear scattering of SAWs providing inverse spectral composition of a reflected wave. The feasibility of reflection-mode nonlinear NDE of small surface fractured defects was also demonstrated
Keywords :
crack detection; mechanical contact; nonlinear acoustics; surface acoustic waves; ultrasonic materials testing; ultrasonic reflection; chaotic behavior; contact acoustic nonlinearity; contact discontinuity; flapping CAN mechanism; inverse spectral composition; nonbonded solid-state contact; nonlinear NDE; nonlinear SAW scattering; reflected wave; reflection-mode nonlinear NDE; small surface fractured defects; static load compression; subharmonic generation; superharmonic generation; Acoustic frequency conversion; Acoustic reflection; Acoustic testing; Crack detection; Nondestructive testing; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1994. Proceedings., 1994 IEEE
Conference_Location :
Cannes, France
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1994.401817
