A study on fracture behaviors of aluminum and CFRP jointed with pin

초록

Weight reduction has been acknowledged in the automotive industry. Particularly, the weight reduction of automotive body is an ecofriendly technology development, as the corresponding fuel consumption or amount of gas polluting the atmosphere is greatly reduced. As a substitute light-weight material, Aluminum is frequently employed while there is CFRP (carbon fiber reinforced plastic) as the most highlighted material in the future. However, one of the problems is concerned with the coupling of light-weight materials. Particularly, in the case of CFRP having a certain fiber structure orientation, the direction perpendicular to fibers exhibits the disadvantage although each direction of fiber has great advantages in the durability and mechanical properties. Therefore CFRP materials will lose advantages of the material when holes or cracks have occurred in the material. Thus, in this study, mechanical characteristics occurring in stationary parts and cracked parts were investigated by producing holes and cracks in the center of the specimen fixed by a pin by using aluminum-6061, CFRP for woven type, and CFRP for unidirectional type. Also, experimental result data were confirmed by using the finite element analysis method and the verification was made by comparing the data corresponding with experimental data. The structural analyses were performed with the design of fiber structure and the lamination process was used for a more accurate design of CFRP. As experiments were performed by conducting with a universal tester by SHIMADZU Company of AG-X 50 kN, the reliabilities of analyses were verified.

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