TY - JOUR
T1 - Material fatigue prognosis with higher-order spectral analysis of nonlinear ultrasonic characteristics
AU - Hajj, Muhammad R.
AU - Duke, John C.
AU - Yoo, Byungseok
PY - 2005
Y1 - 2005
N2 - 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.
AB - 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.
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U2 - 10.2514/6.2005-2319
DO - 10.2514/6.2005-2319
M3 - Conference article
AN - SCOPUS:28844479114
SN - 0273-4508
VL - 9
SP - 6313
EP - 6318
JO - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
JF - Collection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
T2 - 46th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Y2 - 18 April 2005 through 21 April 2005
ER -