Analyze the effect of stacking sequences on nonlinear acoustic signatures in GFRP composite laminates and quantify the delamination using subset simulations

Non-destructive evaluation(NDE) techniques that use nonlinear wave-damage interactions have recently attracted considerable attention for their heightened sensitivity in detecting incipient damage. In this context, a numerical model based on the Finite Element (FE) method has been developed to simulate the nonlinear interaction of guided waves through delaminations in angled glass fiber-reinforced polymer (GFRP) laminated composites. This study aims to investigate the effects of stacking sequences on nonlinear acoustic signatures in GFRP composite laminates and quantify the delamination extent using subset simulations. The stacking sequences of GFRP composite laminates have been varied to analyze their influence on the amplitude of higher harmonic components. The results suggest that the stacking sequences significantly affect the amplitude of nonlinear acoustics. Moreover, the subset simulation technique has been employed to quantify the extent of delamination in the GFRP composite laminates. The proposed approach can effectively quantify the effects of delamination and provide insights into the damage mechanism of composite laminates. The results can help optimize the design of composite structures to improve their performance. This study highlights the importance of nonlinear wave-damage interactions in NDE techniques. It offers a valuable contribution to the ongoing efforts to enhance the reliability and efficiency of composite structures.