Local buckling of delaminated composite sandwich plates

A two-dimensional model of the delaminated face sheet of sandwich plates for predicting local huckling using continuous analysis is presented. The analysis procedure can handle without difficulty sandwich plates having single or multiple embedded delaminations of various shapes and sizes at any locations. The continuous analysis treats the delamination between a face sheet and the core as a continuous system of a perfectly bonded laminate on the core but with an added fictitious force system to make interfacial tractions to vanish over the delaminated region. The method presented in the study is straightforward, simple, and accurate for determining the buckling load of delaminated sandwich plates. A number of numerical results accounting for the effects of transverse normal and shear stiffnesses of the core on the buckling load of sandwich plates having delaminations of various shapes and sizes at different locations are presented. The illustrative examples indicate that the present method is effective and useful for practical applications.

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