Comparison of Bending Characteristic of CFRP Pipe and Aluminum Alloy Pipe Shaped Square and Circular

FRP composite material should be designed the mechanical properties to achieve appropriate with cross-sectional shape, fiber direction, stacking sequence, and thickness for getting optimized performances of structural member. FRP is an anisotropic material. When a pressure or impact energy is applied to FRP structural member, it will be showed the various mechanisms as like compression, bending, and torsion. In this study, it is suggested compression flexural device with buckling method for getting pure flexural values and specimens with circular pipe are manufactured using carbon preimpregnated material sheet according to changing stacking angle and there are tested by three-point device and new flexural device. Pure flexural values can be obtained after comparing by two devices and then it is suggested the good stacking method that has high strength and stiffness. Compression flexural test method that was suggested by Fukuda was used on this study for getting pure bending data and the test equipment was designed based on Euler buckling formula. CFRP members were tested by three-point flexural device and compression flexural device. It was suggested the compression flexural device that get a pure flexural data and it was demonstrated the compression flexural test was better than three-point test. CFRP and Hybrid circular specimens changed stacking angle were tested and compared. The compression flexural device was got more 15% flexural values than three-point flexure device. The compression flexure device was more suitable for circular flexure specimen. Hybrid was better material than about safety and efficiency for structures.