Analysis of Compressive Strength of Composite Materials after Impact

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An embedded through-width delamination (ETWD) sandwich column specimen has been developed and applied to characterization of the post-buckled delamination. Theoretical analysis based on the elastic beam theory and finite element analysis have been carried out in order to investigate the post-buckled delamination. The effect of the mixed mode loading on the critical condition of delamination growth has been also examined and the critical stress is calculated based on the linear elastic fracture mechanics. Onset of the local buckling in the delaminated laminate, the critical load of the delamination growth and propagation of delamination have been investigated experimentally. The analytical results have been compared with the experimental results, and a damage tolerance estimation method has been proposed by using mode I and II interlaminar fracture toughness of composite laminate.