Abstract: Fiber-reinforced resin composite-foam sandwich pipe have better local flexural rigidity compared to the composite thin-walled tube. It had improved the local stability of the composite tubes greatly while weight increased less, which was similar to reinforcement ribs, thus giving full play to the strength of the material. In order to investigate the composite foam sandwich tube′s axial compressive performance of the different design parameters, the axial compressive experiment was studied in this paper. The results show that the fiber plies combination of the resin matrix composites foam sandwich tube has greater influence on the axial compressive performance and the different fiber ply combination can lead specimen damage from brittle failure to ductile failure. While the density of foam core layer has little influence on the ultimate axial compressive strength as it from 0.15g/cm³ to 0.45g/cm³. The paper gives the influence law of the different design parameters on the ultimate bearing capacity of the FRP-foam sandwich tube.

Key words: FRP, sandwich tube, foam, axial compression