Fabrication and Characteristics of Hybrid Composite Materials (ARALL, CARALL) for Aircraft Structures

摘要

A study has been made to establish an optimum condition in thesurface treatment that is important for the fabrication of hybrid compositematerial(ARALL: Aramid Aluminum Laminates, CARALL: Carbon fiberReinforced Aluminum Laminates) and their mechanical characteristics wereinvestigated. PAA(Phosphoric Acid Anodizing) provided good adhesivestrength. On the other hand, the poor adhesive strength was shown on vapordegrease, CAA(Chromic Acid Anodizing) and FPL(Sulfuric/SodiumDichromate Acid Etching) was nearly PAA. In case of fiber direction of 0degree, the tensile strength of CARALL hybrid composite was increased withincreasing fiber thickness, e.g., the tensile strength of 8 ply carbon laminateCARALL was 233percent higher than that of Al 7075-T6 sheet. However onfiber directions of 45 degree and 90 degree, the tensile strengths of CARALLwere decreased compared with that of 0 degree. By the FEM analysis, it wasfound that a partial stress increases in order of epoxy adhesive, aluminum,CFRP(Carbon Fiber Reinforced Plastics). The CARALL nearly satisfied thelaw of mixture despite of the fiber direction and thickness. The impactresistance Or CARALL was higher than that of CFRP.