Dear Li Jiaxin,

A good discussion of the foundations of initial stresses effect on guided waves can be found the literature, among them those published by Otmani et al.: https://doi.org/10.1016/j.compstruct.2020.112085

Generally, The fundamental guided modes can achieve superior of sensitivity to disturbances due to acoustoelastic effect, that could be considered for characterize the performance of the selected composite and structure.