Considering the geometrical configuration of the structure and the deformation mode of the lattice truss

a new displacement field assumption was proposed based on the equivalent continuum theory

and finite element method program was prepared for buckling analysis of lattice truss-core composites.By comparing with the compression test of a group of samples

the buckling behavior of sandwich structures with carbon fiber reinforced lattice truss cores was studied

and the validity was affirmed.Furthermore

the relationship between the buckling load of lattice truss-core composites and lattice parameters (including length

radius and angle of lattice truss) was discussed.The results demonstrate that the little difference exists in bulking load between pyramidal and tetrahedral lattice truss sandwich structures when the volume fraction of the cores are the same

the latter is a little higher.The conclusions are meaningful for the design of lattice truss-core composites.