Shear Buckling Behavior of Lattice Sandwich Panel Under Unilateral Heating

A lattice sandwich panel has the potential for use in engineering structures to achieve weight reduction and thermal insulation. The high temperature distribution on the structure, formed by unilateral heating, is often nonuniform, exhibiting a temperature gradient along the panel thickness direction. This paper investigates the buckling behavior of lattice sandwich panels under nonuniform temperature using numerical simulations and experiments. The results indicate that high temperature significantly affects the load-bearing capacity and failure modes of lattice sandwich panels. At room temperature, the failure mode of a lattice sandwich panel is fracture rather than buckling. Under unilateral heating conditions, the lattice sandwich panel shows buckling failure, and the critical buckling load decreases significantly as the temperature increases. In comparison, under uniform temperature distribution conditions, the critical buckling load of the lattice sandwich panel is significantly lower, but the buckling mode remains similar.