Micro-crack detection of nonlinear Lamb wave propagation in three-dimensional plates with mixed-frequency excitationyg<xref rid="cpb_29_1_014302fn1" ref-type="fn">*</xref><fn id="cpb_29_1_014302fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant Nos. 61571222, 61602235, and 11474160) and the Six Talent Peaks Project of Jiangsu Province, China.</p></fn>

Micro-crack detection of nonlinear Lamb wave propagation in three-dimensional plates with mixed-frequency excitationyg**

Project supported by the National Natural Science Foundation of China (Grant Nos. 61571222, 61602235, and 11474160) and the Six Talent Peaks Project of Jiangsu Province, China.

Zhu Wei-Guang¹, Li Yi-Feng^{1, 2, †}, Guan Li-Qiang¹, Wan Xi-Li¹, Yu Hui-Yang¹, Liu Xiao-Zhou³

Amplitude ratio (β₁ and β₂) variations for different (a) micro-cracks, (b) lengths, and ((c), (d)) width of zero thickness cohesive element in composite laminates.