TY - GEN
T1 - Influence of localized microstructure evolution on second harmonic generation of guided waves
AU - Choi, Gloria
AU - Liu, Yang
AU - Lissenden, III, Clifford Jesse
AU - Rose, Joseph Lawrence
PY - 2014/1/1
Y1 - 2014/1/1
N2 - The following work is intended to utilize the potential of nonlinear guided waves to characterize incipient fatigue damage. Since fatigue crack initiation often occurs in regions where there is localized microscale damage, this difficult-to-analyze condition is investigated in simplistic terms. The third order elastic constants are taken to be a function of position in accordance with the plastic strain distribution accrued during a quasistatic tension test. Two specimen geometries are considered along with multiple average plastic strain levels. Finite element analysis is employed to simulate generation of the s2 secondary Lamb mode from the S1 primary Lamb mode in al aluminum plate. The results indicate that even though the S1/s2 mode pair is synchronized and has positive power flux, the second harmonic wave mode does not accumulate linearly with propagation distance due to the inhomogeneous nature of the plate.
AB - The following work is intended to utilize the potential of nonlinear guided waves to characterize incipient fatigue damage. Since fatigue crack initiation often occurs in regions where there is localized microscale damage, this difficult-to-analyze condition is investigated in simplistic terms. The third order elastic constants are taken to be a function of position in accordance with the plastic strain distribution accrued during a quasistatic tension test. Two specimen geometries are considered along with multiple average plastic strain levels. Finite element analysis is employed to simulate generation of the s2 secondary Lamb mode from the S1 primary Lamb mode in al aluminum plate. The results indicate that even though the S1/s2 mode pair is synchronized and has positive power flux, the second harmonic wave mode does not accumulate linearly with propagation distance due to the inhomogeneous nature of the plate.
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U2 - 10.1063/1.4864879
DO - 10.1063/1.4864879
M3 - Conference contribution
AN - SCOPUS:84903168779
SN - 9780735412118
T3 - AIP Conference Proceedings
SP - 631
EP - 638
BT - 40th Annual Review of Progress in Quantitative Nondestructive Evaluation - Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing
PB - American Institute of Physics Inc.
T2 - 40th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE 2013, Incorporating the 10th International Conference on Barkhausen and Micro-Magnetics, ICBM 2013
Y2 - 21 July 2013 through 26 July 2013
ER -