| A study has been made to establish an optimum condition in the surface treatment that is important for the fabrication of hybrid composite material,(ARALL: Aramid Aluminum Laminates, CARALL: Carbon fiber Reinforced Aluminum Laminates) and their mechanical characteristics were investigated. PAA(Phosphoric Acid Anodizing) provided good adhesive strength. On the other hand, the poor adhesive strength was shown on vapor degrease, CAA(Chromic Acid Anodizing) and FPL(Sulfuric/Sodium Dichromate Acid Etching) was nearly PAA. In case of fiber direction of 0 degree, the tensile strength of CARALL hybrid composite was increased with increasing fiber thickness, e.g., the tensile strength of 8 ply carbon laminate CARALL was 233% higher than that of Al 7075-T6 sheet. However on fiber directions of 45 degree and 90 degree, the tensile strengths of CARALL were decreased compared with that of 0 degree. By the FEM analysis, it was found that a partial stress increases in order of epoxy adhesive, aluminum, CFRP(Carbon Fiber Reinforced Plastics). The CARALL nearly satisfied the law of mixture despite of the fiber direction and thickness. The impact resistance of CARALL was higher than that of CFRP. |
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