Material fatigue prognosis with higher-order spectral analysis of nonlinear ultrasonic characteristics

Muhammad R. Hajj, John C. Duke, Byungseok Yoo

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Nonlinear aspects of ultrasonic wave propagation in a specimen that is subjected to increasing intervals of cyclical loadings are characterized. The ultimate goal is to develop an approach that would facilitate monitoring the extent of the deterioration occurring during the precursor to crack formation. The effectiveness of using higher-order spectral analysis tools, and more particularly the bispectrum, in characterizing certain nonlinear aspects of the ultrasonic wave propagation are presented. The results show that the bispectrum is capable of detecting couplings between the fundamental frequency of the exciting burst, its subharmonic, its first harmonic and its sidebands. Differences in coupling levels between these modes are observed as the number of cycles is increased. This suggests that such levels could be used to derive parameters that can be directly related to the fatigue damage state of the material. The results also present a discussion on the shortcomings of using the amplitudes of generated harmonics to determine the fatigue damage state in a specimen.

Original languageEnglish
Pages (from-to)6313-6318
Number of pages6
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume9
DOIs
StatePublished - 2005
Event46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference - Austin, TX, United States
Duration: 18 Apr 200521 Apr 2005

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