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Analysis of the nonlinear reverberation of titanium alloys fatigued at high amplitude ultrasonic vibration

AuthorsVan den Abeele, K.; Campos-Pozuelo, Cleofé; Gallego Juárez, Juan Antonio; Windels, F.; Bollen, B.
KeywordsTitanium alloys
Reverberation field
Resonance frequency
Amplitude dependence
Damping characteristics
Issue DateSep-2002
PublisherSociedad Española de Acústica
CitationForum Acusticum Sevilla 2002. Nonlinear Acoustics ; NON-02-002-IP
AbstractThe strong amplitude dependence of material parameters of microinhomogeneous materials can be used to link observations of nonlinearity to micro-scale damage. We have measured the amplitude dependence of the resonance frequency and damping characteristics in the reverberation field of the fundamental eigenmode of titanium alloy samples at regular instances during dynamic fatigue loading at high strains. The analysis of the reverberation is performed in the frequency domain using classical time-windowed FFT, as well as in the time domain using analytical functions with iteratively optimised parameters over each time window. The results show a significant increase of the nonlinearity in the frequency and damping characteristics of the signals observed during the fatiguing process.
Description6 pages.-- PACS nr.: 81.40.-Z.-- Communication presented at: Forum Acusticum Sevilla 2002 (Sevilla, Spain, 16-20 Sep 2002), comprising: 3rd European Congress on Acoustics; XXXIII Spanish Congress on Acoustics (TecniAcústica 2002); European and Japanese Symposium on Acoustics; 3rd Iberian Congress on Acoustics.-- Special issue of the journal Revista de Acústica, Vol. XXXIII, year 2002.
Appears in Collections:(IA) Comunicaciones congresos

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