COMPOSITE MATERIAL

PROBLEM TO BE SOLVED: To form at least a part of a lateral cross section shape of a composite material made of fiber reinforced resin in a cylindrical cross section shape (closed cross section shape) without impairing light weight. SOLUTION: The composite material 11 for absorbing load energy is constituted into a square cylindrical shape by a skeleton member 12 comprising a three-dimensional textile impregnated with a thermosetting resin; and a filament winding part 13 formed by winding a filament attached with a thermosetting resin on a periphery of the skeleton member 12. The skeleton member 12 is formed in a predetermined shape (lateral cross section is a C-shaped opened cross section shape) having a groove 120 on a peripheral part. Both ends of the groove 120 are opened. The skeleton member 12 has a bottom wall 121 of a flat plate-like shape forming a bottom of the groove 120; and side walls 123, 124 of flat plate-like shape. The filament winding part 13 is joined to outer surfaces of the side walls 123, 124 and an outer surface of the bottom wall 121 and closes an opening 122 of the groove 120 so as to straddle it. COPYRIGHT: (C)2007,JPO&INPIT