Compressive buckling analysis of rectangular composite laminates containing multiple delaminations

摘要

The buckling analysis of rectangular composite laminates with multiple embedded delaminations under in-plane compressive load is performed using Mindlin plate elements in a finite element method. The buckling load and mode are obtained by solving an eigenproblem. Each sublaminate in the delaminated region is assigned with a separate mid-plane. The penalty function method is used to enforce constraints preventing overlap between sublaminates. Numerical results show the effect of the number, size and shape of delaminations on the buckling load and a comparison is made between the effects of multiple delaminations and a hole on the buckling load.