경량화용 Al/CFRP 혼성구조부재의 굽힘특성

Abstract

Applications of composite materials in various engineering fields have been extended significantly. Various researchers have written the rigidity and strength characteristics of composite material according to shaped structures and material direction. Strength and rigidity by design parameters should be determined during the composite material test. Design parameters, material systems, stacking direction, thickness, stacking sequence, etc are available. CFRP, which has been widely used in space/aviation industries, sports/leisure, and general structural applications due to dimensional stability, unchangeability of material property, high strength and rigidity, corrosion resistance, etc, was selected. For automobile application, integration, complex features, safety and environmental issues have been improved. To meet this demand, structural members and parts should be light-weight with high strength and rigidity. To achieve structural members of CFRP with high strength and rigidity, theoretical approaches is limited to isotropic material, and empirical studies have been conducted. As with other composite materials, CFRP shows different rigidity and strength according design parameters due to difference in properties in fiber and substrate material. Among the numerous design parameters, orientation angle is selected to find optimal condition for strength and rigidity about compression. Structural members receive not only compression but also bending and torsion. Therefore, respective study should be conducted. Studies on compression have been extensively made, but the study on torsion and bending is lacking. In addition, aluminum reinforcement is applied to prevent the shortcoming of CFRP-brittleness, strength reduction under external pressure. In the study, For the mechanical properties like bending strength and rigidity, CFRP members and Hybrid members with aluminum reinforcement was manufactured by changing of cross-section and orientation angle and test three point bending. Stacking thickness and sequence among design parameters refers the one in previous study.