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Ultrasonic Techniques Based Inversion of Elastic Properties for a Single Lamina in Composites Laminates

A composite laminate is generally considered consisting of a series of laminae having the same elastic constants but different material orientations, and each lamina can be thought of as a transversely isotropic material. With known stacking sequences, this research proposed a Lamb wave based methodology to reconstruct the stiffness coefficients of each lamina in composite laminates. Genetic algorithms (GAs) are used to implement the inversion by minimizing the error between the experimentally measured Lamb wave phase velocities and the theoretically calculated ones. A laser generation based imaging (LGBI) system is introduced to accurately measure the phase velocities of the propagating Lamb waves. Theoretically, a semi-analytical finite element (SAFE) method is employed to calculate the dispersion curves. In this research, a unidirectional carbon fibre reinforced plastic (CFRP) composite is studied with regard to elastic properties evaluation. The reconstructed parameters are compared with the real material properties.