A Theoretical and Experimental Study of the Thermal Buckling Behaviour of the Fully-clamped Sandwich Panel with Metal-truss Core

摘要

This article presents a theoretical analysis and experimental study of thermal buckling behaviour ofsandwich panels with metal truss cores under fully-clamped boundary conditions subject to uniformtemperature rise.The theoretical analysis adopts Ressiner model and assumes the truss core is acontinuous material.We ignore the flexural rigidity and bending stiffness of the core,consider the shearstiffness of the sandwich panel is only contributed by the core.By using the double Fourier expansionof the virtual deformation mode,we obtained the critical temperature of sandwich panels underclamped boundary conditions numerically.We carried out thermal buckling experiments on sandwichpanels with a specifically designed fixture which can introduce in-plane load in the sandwich panelusing thermal mismatch between the panel and the frame.High temperature strain gauges were used tomeasure the local strains of the panels from which the critical buckling temperature can be determinedwith Southwell method.