Nonlinear Lamb Wave Second Harmonic Technique for Micro-crack Detection in Plates Based on Theory of Hertz Stress

doi:10.3901/JME.2017.12.060

Abstract

Abstract:

For the metal plate structure in micro crack detection problem, the thesis of the second harmonic of the nonlinear Lamb wave detection method research based on. First, the board in the second harmonic nonlinear Lamb wave theory is used to study, analyses the influence of the micro crack width and length of second harmonic excitation efficiency, and through the numerical simulation of nonlinear effect of different length and width of the micro crack and the Lamb wave interaction. The results show that with the increase of micro crack length, the two harmonic amplitude increases and the two harmonic amplitude decreases with the increase of the micro crack width. Based on the above research, the plate crack in nonlinear Lamb wave detection experiments. The results show that by measuring structure of Lamb wave second harmonic nonlinearity coefficient, for structure of micro crack detection and quantitative evaluation. The research work is a useful exploration for the quantitative detection of micro cracks in the plate.

Key words: nondestructive testing, nonlinear Lamb wave, second harmonic, theory of Hertz stress, micro crack

JIAO Jingpin, MENG Xiangji, Lü Hongtao, WU Bin, HE Cunfu. Nonlinear Lamb Wave Second Harmonic Technique for Micro-crack Detection in Plates Based on Theory of Hertz Stress[J]. Journal of Mechanical Engineering, 2017, 53(12): 60-69.

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Nonlinear Lamb Wave Second Harmonic Technique for Micro-crack Detection in Plates Based on Theory of Hertz Stress

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