Evaluation of material degradation of composite laminates using nonlinear lamb wave

Abstract

This study introduces a new approach to evaluate material degradation caused by thermal fatigue in composite laminates by using nonlinear Lamb waves. The correlation between normalized nonlinear parameters and degradation states is studied. S1 Lamb mode which has phase and group matching features is chosen for the practical generation of nonlinear Lamb wave. The measured acoustics normalized nonlinearity is directly related to material degradation. It could be concluded that it is possible to use nonlinear Lamb waves to evaluate composite laminates degradation. © RILEM 2013.