Abstract:
Composite structural components play a vital role in the lightweight ships, and the stability of their joint performance is of great significance for the safety and transportation efficiency of the vessel. The application of the aluminum alloy and carbon fiber reinforced polymers (CFRP) composite materials in the manufacture of ship bulkheads, frames, and other structural components not only significantly reduces the weight but also enhances the overall strength, balances the overall toughness of the composite material, and exhibits high impact energy absorption capability. In order to explore the feasibility of stamping-bonding by hot stamping process for aluminum alloy and CFRP, using peeling test, the effects of different surface treatments for 6061 aluminum alloy, different holding time in stamping-bonding stage, and surface modification of prepreg materials on the properties of the aluminum alloy/CFRP composite joints are studied. The results show that the shear strengths of the joint after polishing, polishing and alkali cleaning, and polishing and acid cleaning on the surface of aluminum alloy are 2.50 MPa, 4.30 MPa and 4.60 MPa, respectively, which are 155.1 %, 338.8 % and 369.4 % higher than that of the untreated joint sample. In the stamping-bonding stage, when the holding time is less than 60 s, the joint shear strength increases rapidly to about 4.90 MPa. When the holding time is more than 60 s, the joint's shear strength decreases first, then increases slowly, and at last keeps stable in the range of 3.92 to 4.34 MPa. When the surface of the prepreg is sprayed with Graphene Oxide (GO), the shear strength of the joint is 5.98 MPa, which is 30.0 % higher than that of the joint with the prepreg untreated.