Elastic Constants Identification for Laminated Composites Based on Lamb Waves Propagation

Abstract

The paper proposes a method of estimating elastic constants of thin plates based on the guided waves propagation and the inverse problem solution. In the proposed approach a Scanning Laser Doppler Vibrometer measurements are employed to find the dispersion curves of Lamb waves propagating in thin plates. The virtual counterpart of the experiment is a numerical solution of high frequency wave propagation problem using the Local Interaction Simulation Approach. The experimental and simulated data are combined in a model-based material constants identification framework. The effectiveness of the proposed approach is demonstrated on an isotropic aluminium and composite plates. The results of the identification procedure are compared with the classical materials testing techniques in order to prove the good accuracy of the proposed approach.