Composite material stitching structure reinforced with z-direction fiber

Abstract

The present invention relates to a fastening structure of a composite material structure, and more particularly, to a composite material stitching structure reinforced with z-direction fiber which improves strength in a lamination direction of a relatively weak composite material structure, for a composite material structure, in which composite materials are laminated and bonded.

1 . A composite material stitching structure reinforced with z-direction fiber, the composite material stitching structure comprising:
 a composite material laminated body in which a plurality of uncured composite material prepreg or preform is laminated; and   uncured flexible composite fiber which penetrates the composite material laminated body in a lamination direction of the composite material laminated body and has a predetermined length,   wherein the composite fiber is penetrated so that a distal end of the composite fiber protrudes from the outermost portion of the composite material laminated body to an external side by a predetermined distance, the protruding distal end is bent to be disposed in a plane direction of the composite material laminated body, and the composite fiber is bent and fixed through a heat curing process of the composite material laminated body.   
     
     
         2 . The composite material stitching structure reinforced with z-direction fiber of  claim 1 , wherein the composite fiber is formed of discontinuous monofilaments. 
     
     
         3 . The composite material stitching structure reinforced with z-direction fiber of  claim 1 , wherein bending directions of a distal end at one side of the composite fiber and a distal end at the other side of the composite fiber are arranged in a specific direction on a surface of the composite material laminated body. 
     
     
         4 . The composite material stitching structure reinforced with z-direction fiber of  claim 1 , wherein the composite fiber is formed of a plurality of strands, and a plurality of strands at the distal end of the composite fiber is radially bent. 
     
     
         5 . The composite material stitching structure reinforced with z-direction fiber of  claim 3 , wherein the bending direction of one distal end of the composite fiber is opposite to the bending direction of the other distal end of the composite fiber. 
     
     
         6 . The composite material stitching structure reinforced with z-direction fiber of  claim 1 , wherein the composite fibers penetrates the composite material laminated body in the lamination direction of the composite material, with the plurality of composite fibers are disposed while being spaced apart from one another in a plane direction of the composite material.