Buckling of Disbonds in Honeycomb-core Sandwich Beams

The buckling behavior of a disbond in a sandwich beam is analyzed by modeling the sandwich as a beam on a Winkler foundation. The foundation stiffness is derived through a stress function approach, modeling the core as a two-dimensional, orthotropic material in plane strain. When the resulting stiffness term is used in the Winkler foundation model, the predicted buckling loads vary from the specimen test results by only 1.7% (with a standard...