| 摘要 |
PROBLEM TO BE SOLVED: To uniformize strength of a fiber-reinforced composite material and to improve its reliability by making braid structure of a fiber base material becoming a preform suitable and keeping density of a braid of the preform constant. SOLUTION: In the preform 1, a plurality of shaping parts Z1 to Z7 giving different shapes are provided along a bent line 24. A plurality of shaping braiding parts Y1 to Y7 are provided corresponding to formed parts of respective shaping parts Z1 to Z7 at a braiding surface of the fiber base material 2. Density of the braid 4 at respective shaping braiding parts Y1 to Y7 is set to density compensating density change of the braid 4 of respective shaping parts Z1 to Z7 in a shaping process. Thus the preform 1 is formed of the fiber base material 2 equipped with a plurality of shaping braiding parts Y1 to Y7 and density of the braid 4 at the plurality of shaping parts Z1 to Z7 is fixed. COPYRIGHT: (C)2010,JPO&INPIT |
