Response features of nonlinear circumferential guided wave on early damage in inner layer of a composite circular tube
Li Ming-Liang1, Liu Liang-Bing1, Gao Guang-Jian1, Deng Ming-Xi1, †, Hu Ning1, Xiang Yan-Xun2, ‡, Zhu Wu-Jun2
       

Amplitude–frequency curves of the fundamental wave and second harmonic for different values of scale coefficient: (a) e = 1.0, (b) e = 1.3, (c) e = 1.6.