Аннотация:The appearance of proper and degenerate Dirac cones during the propagation of Lamb waves in anisotropic functionally graded layer satisfying the Wiechert condition is analyzed. It has been revealed thatDirac cones appear in a layer, in which the distribution of physical properties is asymmetric with respect tothe midsurface and in any Poisson’s ratio. The study is based on the Cauchy formalism and the exponentialfundamental matrix method.
