Detection of stiffness reductions in laminated composite plates from their dynamic response using the microgenetic algorithm

摘要

In this study, we investigate a method to detect damage in a laminated composite structure by analyzing its dynamic response to impact loads. The combined finite element method (FEM) with seven degrees of freedom (DOF) and the advanced microgenetic algorithm described in this paper may allow us not only to detect the damaged elements but also to find their locations and the extent of damage. A high order shear deformation theory (HSDT) is used to predict the structural behavior and to detect damage of laminated composite plates. The effects of noise associated with the uncertainty of measurements due to the complex nature of composites are considered for [0/90] s and [±45] s layup sequences. The results indicate that the new method is computationally efficient in characterizing damage for complex structures such as laminated composites.