Fiber reinforced plastic member

Abstract

Provided is a fiber reinforced plastic member made by a braiding technique to obtain high rigidity and superior vibration damping performance under a bending load. A reinforcing member made of carbon fiber reinforced plastic resin extends in a specific direction along an axis of the reinforcing member and includes a carbon fiber braided structure. The carbon fiber braided structure has a structure in which a plurality of axial yarns, a plurality of first braid yarns, and a plurality of second braid yarns are braided. A plurality of first braid yarns are wound to intersect the axis at a first braid angle. A plurality of second braid yarns are wound to intersect the axis at a second braid angle. The first braid yarns and the second braid yarns intersect each other. The reinforcing member has a region approximately in the longitudinal middle where the first braid angle and the second braid angle of the first braid yarns and the second braid yarns take values larger than in other region regarding the longitudinal direction.

1 . A fiber reinforced plastic member, which is made of fiber reinforced plastic resin and
 extends in a specific direction,   the fiber reinforced plastic member comprising a fiber-braided structure,   the fiber-braided structure including   first braid yarns wound to intersect the specific direction at a first braid angle, and   second braid yarns wound to intersect the specific direction at a second braid angle, the first braid yarns and the second braid yarns being braided together, wherein   the fiber-braided structure includes a predetermined region between both ends, regarding a longitudinal direction of the fiber reinforced plastic member, at least one of the first braid angle and the second braid angle in the predetermined region being larger than the braid angle in an other region other than the predetermined region.   
     
     
         2 . The fiber reinforced plastic member according to  claim 1 , wherein the first braid angle and the second braid angle are 60 degrees or larger but smaller than 90 degrees. 
     
     
         3 . The fiber reinforced plastic member according to  claim 1 , wherein
 the first braid angle of the first braid yarns and the second braid angle of the second braid yarns in the other region are 15 degrees or larger up to 45 degrees.   
     
     
         4 . The fiber reinforced plastic member according to  claim 1 , wherein
 a ratio of a longitudinal length of the predetermined region to a total longitudinal length of the fiber reinforced plastic member is 0.001 or larger up to 0.01.   
     
     
         5 . The fiber reinforced plastic member according to  claim 1 , wherein
 the fiber-braided structure includes, in addition to the first braid yarns and the second braid yarns, axial yarns braided to extend in the specific direction.   
     
     
         6 . The fiber reinforced plastic member according to  claim 1 , wherein
 an outer diameter of the fiber reinforced plastic member is constant throughout the longitudinal direction.   
     
     
         7 . The fiber reinforced plastic member according to  claim 1 , wherein
 the fiber reinforced plastic member has a form of a hollow cylindrical member, and   the fiber reinforced plastic member has an inner diameter smaller in the predetermined region than in the other region.   
     
     
         8 . The fiber reinforced plastic member according to  claim 1 , wherein
 the first braid yarns and the second braid yarns include carbon fibers.