Fiber structure

Abstract

A fiber structure includes a first laminate and a second laminate, which are arranged such that the yarn main axes of first reinforcement fiber yarns and second reinforcement fiber yarns are caused to be orthogonal to each other and that the main yarn axes of first auxiliary yarns and second auxiliary yarns are caused to be orthogonal to each other. The engagement of first intermediate structure yarns of the first laminate and second intermediate structure yarns of the second laminate joins the first laminate and the second laminate together in the lamination direction.

1 . A fiber structure comprising a plurality of laminates, wherein
 the laminates each include a plurality of stacked fiber layers,   the fiber layers each include reinforcement fiber yarns, auxiliary yarns, and intralayer structural yarns, the reinforcement fiber yarns and the auxiliary yarns being arranged alternately, and the intralayer structural yarns joining the reinforcement fiber yarns and the auxiliary yarns together in an arrangement direction,   in each laminate,
 yarn main axis directions of the reinforcement fiber yarns and the auxiliary yarns of each of the fiber layers are the same, 
 the reinforcement fiber yarns are arranged in such a manner that the relative positions are shifted in a stacking direction of the fiber layers with the reinforcement fiber yarns overlapping each other, 
 the auxiliary yarns are arranged in such a manner that the relative positions are shifted, and 
 the fiber layers are joined with intermediate structural yarns engaged with the auxiliary yarns located on opposite ends in the stacking direction, 
   the laminates are arranged such that
 a yarn main axis of the reinforcement fiber yarns of each laminate is orthogonal to a yarn main axis of the reinforcement fiber yarns of another laminate, and 
 a yarn main axis of the auxiliary yarns of each laminate is orthogonal to a yarn main axis of the auxiliary yarns of another laminate, and 
   the laminates are joined together in the stacking direction by an engagement between at least one of a set of the intralayer structural yarns and a set of the intermediate structural yarns of the laminate in which the yarn main axis extends in one direction and at least one of a set of the intralayer structural yarns and a set of the intermediate structural yarns of the laminate in which the yarn main axis extends in another direction.   
     
     
         2 . The fiber structure according to  claim 1 , wherein the laminates are joined together by the engagement between the intermediate structural yarns of the laminate in which the yarn main axis extends in one direction and the intermediate structural yarns of the laminate in which the yarn main axis extends in another direction. 
     
     
         3 . The fiber structure according to  claim 1 , wherein the laminates are joined together by the engagement between the intralayer structural yarns of the laminate in which the yarn main axis extends in one direction and the intralayer structural yarns of the laminate in which the yarn main axis extends in another direction. 
     
     
         4 . The fiber structure according to  claim 1 , wherein the laminates are joined together by
 the engagement between the intermediate structural yarns of the laminate in which the yarn main axis extends in one direction and the intermediate structural yarns of the laminate in which the yarn main axis extends in another direction, and   the engagement between the intralayer structural yarns of the laminate in which the yarn main axis extends in one direction and the intralayer structural yarns of the laminate in which the yarn main axis extends in another direction.   
     
     
         5 . The fiber structure according to  claim 1 , wherein each of the intermediate structural yarns is arranged between the intralayer structural yarns located adjacent to each other in the yarn main axis direction of the reinforcement fiber yarns and the auxiliary yarns. 
     
     
         6 . A fiber-reinforced composite in which a fiber structure is impregnated with a matrix resin, wherein
 the fiber structure includes a plurality of laminates,   the laminates each include a plurality of stacked fiber layers,   the fiber layers each include reinforcement fiber yarns, auxiliary yarns, and intralayer structural yarns, the reinforcement fiber yarns and the auxiliary yarns being arranged alternately, and the intralayer structural yarns joining the reinforcement fiber yarns and the auxiliary yarns together in an arrangement direction,   in each laminate,
 yarn main axis directions of the reinforcement fiber yarns and the auxiliary yarns of each of the fiber layers are the same, 
 the reinforcement fiber yarns are arranged in such a manner that the relative positions are shifted in a stacking direction of the fiber layers with the reinforcement fiber yarns overlapping each other, 
 the auxiliary yarns are arranged in such a manner that the relative positions are shifted, and 
 the fiber layers are joined with intermediate structural yarns engaged with the auxiliary yarns located on opposite ends in the stacking direction, 
   the laminates are arranged such that
 a yarn main axis of the reinforcement fiber yarns of each laminate is orthogonal to a yarn main axis of the reinforcement fiber yarns of another laminate, and 
 a yarn main axis of the auxiliary yarns of each laminate is orthogonal to a yarn main axis of the auxiliary yarns of another laminate, and 
   the laminates are joined together in the stacking direction by an engagement between at least one of a set of the intralayer structural yarns and a set of the intermediate structural yarns of the laminate in which the yarn main axis extends in one direction and at least one of a set of the intralayer structural yarns and a set of the intermediate structural yarns of the laminate in which the yarn main axis extends in another direction.