Compression performance of column-cell sandwich composite

A new sandwich structure which core is made of thin-walled semi-ellipsoidal shell is designed, column-cell sandwich composite was prepared by pre-panel preparation process. A series of quasi-static axial compression experiments were carried out on 2 × 2 thin-walled semi-ellipsoidal shell, the compression deformation and yield behavior of thin wall semi-ellipsoidal shells with different materials, diameters and wall thicknesses were studied by means of ANSYS/LS-DYNA finite element simulation and experiment. Then, the effect of filling mode of epoxy resin on the mechanical properties of Column-cell sandwich composites was studied. The results show that the deformation process of the thin spherical shell can be divided into local flattening, axisymmetric depression, non-axisymmetric depression and compaction stage. As the wall thickness increases, the deformation mode changes from the polygon to the ring and the deformation process become three stages; small diameter requires larger force under the conditions of the same compression displacement, as the diameter increases, the critical displacement of flipping and asymmetric buckling increases; Epoxy filled in the spherical shell of the sample specific compression performance is better than filled in the outer shell and better than unfilled with epoxy resin.