Hazards of local failure in bending of composite sandwich panels from point forces

摘要

Simple design formulae have been given to evaluate the flexural characteristics of a sandwich panel in three-point bending. The model modification has allowed consideration of distinctions in the deflections of face layers and hence thedeformation of a normal as well as transverse normal stresses in the middle layer have been deduced. Local tour-vatures, bending and transversal stresses have been studied depending on the thicknesses of face layers and the transversal properties of acore in shear and compression. Hazard of initial failure from local moment stresses at the central section as well as transversal stresses at the support section and close to the panel end has been revealed. Comparative estimates for bending stressesrefining the results of conventional designs have been obtained.