The article presents the solution of symmetrical face sheet wrinkling problem for sandwich panel with composite facings and an orthotropic core. The new model is proposed for elastic core that takes into account compressive and shear stiffnesses as well as nonlinear change of transverse displacement over the core thickness at wrinkling. The governing buckling equation is derived using energy method. Analysis of cylindrical face wrinkling is performed for sandwich strips subjected to compressive loads applied to the two opposite simply supported edges. The effects of elastic and geometric parameters on the critical buckling stresses and wrinkling waves' formation are examined.
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