The damage processes and forms of two different heights of foam core sandwich structure composites
subjected to quasi static indentation were studied. The curves of contact force and displacement as well as the damage morphologies of different displacements were obtained by controlling the displacements. The differences of damage processes between thick foam core materials and thin foam core materials were also compared. The result shows that the damage process consists of foam core collapsing,foam core cracking,skin delaminating and skin core debonding; the damage form is that the cracks are 依45毅in the direction of foam core thickness when the core is thick,and 90毅 when the core is thin.