Method for computing that dispersion curve of Lamb waves in layer plates based on thin-layer discretization

The invention relates to a method for calculating Lamb wave dispersion curve in a layered plate based on thin layer discrete calculation, comprising the following steps of constructing a virtual dielectric layer under the layered plate and arranging a rigid base on the bottom surface of the virtual dielectric layer; horizontally dispering the layered plate and the virtual dielectric layer to obtain a plurality of thin layers; calculating the stiffness matrix Kn of each thin layer separately; integrating the stiffness matrix Kn of each thin layer into a total stiffness matrix K; the total displacement vector U and the total external force vector F of the interface of the thin layer being constructed from the displacement and the external force components of the interface of the thin layer,respectively, and KU=F is obtained. In the free state, the total external force vector F=0, KU=F can be written as KU=0, the eigenvalue of KU=0 is solved, the eigenvalue is screened, and the phase velocity of Lamb wave is cal