Plastic behavior of the foam-filled sandwich beam with circular tube core under transverse loading

•Plastic behavior of foam-filled sandwich beams with circular tube core under transverse loading is studied.•Analytical model for the plastic behavior of the foam-filled sandwich beam with circular tube core is developed.•Analytical results are in good agreement with numerical ones.•Load-carrying capacity of sandwich beams increase with increase of foam strength, face-sheet thickness, tube-wall thickness.