Location of micro-cracks in plates using time reversed nonlinear Lamb waves

Liu Yaoxin¹, He Aijun³, Liu Jiehui¹, Mao Yiwei¹, Liu Xiaozhou^{1, 2, †}

The location results of the PM model with its center coordinate o_PM at (a) (–20, 0) mm, (b) (–10, 0) mm, (c) (0, 0) mm, (d) (10, 0) mm, and (e) (20, 0) mm, respectively. In each case, the moment t k j (j = 1 – 5) is determined when the maximum of the sum amplitude of P₁ and P₂, E MAX j , occurs. The distribution of P₁ and P₂ at that moment is plotted and the values are normalized by E MAX j .