Tubular fiber structure and fiber reinforced composite material

Abstract

A tubular fiber structure, which includes a tubular section and a flange section that is on at least one end of the tubular section and which is formed by shaping a wound fabric base material.

1 . A tubular fiber structure comprising:
 a tube; and   a flange located on at least one side of the tube;   wherein the tubular fiber structure is formed by shaping a fabric base material that is rolled.   
     
     
         2 . The tubular fiber structure according to  claim 1 , wherein
 the flange is formed by a woven texture, and   the tube is formed by a non-woven texture.   
     
     
         3 . The tubular fiber structure according to  claim 1 , further comprising a reinforcement portion arranged at an inner side of the tube and formed by a fabric base material. 
     
     
         4 . The tubular fiber structure according to  claim 3 , wherein
 the fabric base material forming the tube and the flange includes a tube-corresponding portion corresponding to the tube,   the tube-corresponding portion includes a rolled inner end located at a radially inner side when the tube-corresponding portion is rolled to form the tube, and   the fabric base material of the reinforcement portion is continuous with the rolled inner end.   
     
     
         5 . The tubular fiber structure according to  claim 1 , wherein the tube is formed to be three-dimensional by sewing together overlapping layers of the fabric base material with a stitching thread. 
     
     
         6 . The tubular fiber structure according to  claim 1 , wherein a fabric base material forming the tube includes a first fabric base material, in which threads serving as reinforcement fibers are laid out at angles of 0 degrees and 90 degrees, and a second fabric base material, in which threads serving as reinforcement fibers are laid out angles of +45 degrees and −45 degrees. 
     
     
         7 . The tubular fiber structure according to  claim 1 , wherein a portion of the fabric base material forming the flange includes threads extending continuously over the entire circumference in a circumferential direction and laid out in a radial direction. 
     
     
         8 . The tubular fiber structure according to  claim 1 , wherein
 a portion of a fabric base material forming the flange includes threads extending in a circumferential direction and laid out in a radial direction, and   the threads located at outer positions in the radial direction of the flange are thicker.   
     
     
         9 . The tubular fiber structure according to  claim 1 , wherein
 a portion of a fabric base material forming the flange includes threads extending in a circumferential direction and laid out in a radial direction, and   the threads are laid out in intervals that become smaller at outer positions in the radial direction.   
     
     
         10 . The tubular fiber structure according to  claim 1 , wherein the tube is tapered. 
     
     
         11 . The tubular fiber structure according to  claim 10 , wherein the tube has a thickness that changes in a stepped manner from one end to another end of the tube. 
     
     
         12 . The tubular fiber structure according to  claim 1 , further comprising a positioning tube that projects from the flange. 
     
     
         13 . A fiber reinforced composite material comprising the tubular fiber structure according to  claim 1  as a reinforcement.