LAUSR

Abstract The paper presents the influence of PU foam with an addition of glass fiber on the buckling resistance of an I-beam. Three beam types were considered: an aluminum beam (AA), a composite AA-PU beam and a composite AA-PU-CFRP beam. Each beam was made with two C-profiles connected by webs. The flanges were reinforced by flat bars. Channels were made by bending 0.08 mm thick aluminum alloy 6061-T6 sheets. Flat bars were made from aluminum alloy 6061-T6 2.0 mm in thickness. The metal sheets components were connected by Refill Friction Stir Spot Welding RFSSW and Resistant Spot Welding RSW technologies. The composite AA-PU beam additionally has the stiffening of the web by polyurethane foam with the addition of glass fiber. The PU foam filled up the I-sections in such a way that rectangular cross-sections were obtained. The composite belka AA-PU-CFRP beam was made like the composite AA-PU beam, but with CFRP plates glued to the flanges. The beams were subjected to three-point bending tests. The load-bearing capacity for a buckling resistance was analyzed. The results from experimental tests were used in numerical analysis carried out by the ADINA System program based on the Finite Element Method.