TY - JOUR
T1 - A nonlinear-guided wave technique for evaluating plasticity-driven material damage in a metal plate
AU - Pruell, C.
AU - Kim, J. Y.
AU - Qu, J.
AU - Jacobs, L. J.
PY - 2009/4
Y1 - 2009/4
N2 - This research develops an experimental method for evaluating material damage due to plastic deformation in a metal plate using nonlinear-guided waves. An improved version of a previously proposed measurement technique is used. The material nonlinearities of aluminum specimens loaded to produce different levels of plastic strain are measured with Lamb waves. A pair of wedge transducers is used to generate and detect the fundamental (s1) and second harmonic (s2) Lamb waves. The weak amplitude of the second harmonic wave is extracted from the spectrogram of a received signal. The measured acoustic nonlinearity increases monotonically with the level of plasticity (plastic strain), which is similar to the behavior of longitudinal and Rayleigh waves. This result indicates that Lamb waves can be used to assess plasticity-driven material damage in the established framework of the second harmonic generation technique. The effects and the importance of signal processing in determining the nonlinearity parameter are also discussed.
AB - This research develops an experimental method for evaluating material damage due to plastic deformation in a metal plate using nonlinear-guided waves. An improved version of a previously proposed measurement technique is used. The material nonlinearities of aluminum specimens loaded to produce different levels of plastic strain are measured with Lamb waves. A pair of wedge transducers is used to generate and detect the fundamental (s1) and second harmonic (s2) Lamb waves. The weak amplitude of the second harmonic wave is extracted from the spectrogram of a received signal. The measured acoustic nonlinearity increases monotonically with the level of plasticity (plastic strain), which is similar to the behavior of longitudinal and Rayleigh waves. This result indicates that Lamb waves can be used to assess plasticity-driven material damage in the established framework of the second harmonic generation technique. The effects and the importance of signal processing in determining the nonlinearity parameter are also discussed.
KW - Damage assessment
KW - Lamb waves
KW - Nonlinear ultrasonics
KW - Plasticity
KW - Spectrogram
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UR - http://www.scopus.com/inward/citedby.url?scp=61749104175&partnerID=8YFLogxK
U2 - 10.1016/j.ndteint.2008.09.009
DO - 10.1016/j.ndteint.2008.09.009
M3 - Article
AN - SCOPUS:61749104175
SN - 0963-8695
VL - 42
SP - 199
EP - 203
JO - NDT and E International
JF - NDT and E International
IS - 3
ER -