JP2023167846A - Fiber structure for fiber-reinforced composite material and fiber-reinforced composite material - Google Patents

Abstract

To provide a fiber structure for a fiber-reinforced composite material and a fiber-reinforced composite material, capable of suppressing reduction in strength of the fiber-reinforced composite material.SOLUTION: In a fiber structure for a fiber-reinforced composite material, a second yarn layer 22 located at a first end in a third direction Z has first auxiliary yarns 25 which extend in a second direction Y between weft yarns 24 adjoining in a first direction X, and are engaged with second binding yarns 32. The second yarn layer 22 located at a second end in the third direction Z has second auxiliary yarns 26 which extend in the second direction Y between the weft yarns 24 adjoining in the first direction X, and are engaged with first binding yarns 31. Outer diameters of the first binding yarn 31, the second binding yarn 32, the first auxiliary yarn 25, and the second auxiliary yarn 26 are smaller than outer diameters of a warp yarn 23 and the weft yarn 24. The first auxiliary yarn 25 and the second auxiliary yarn 26 pile up in the third direction Z.SELECTED DRAWING: Figure 3

Description

The present invention relates to a fiber structure for a fiber-reinforced composite material and a fiber-reinforced composite material.

BACKGROUND ART Fiber-reinforced composite materials in which a fiber structure is composited into a matrix have been known. Patent Document 1 discloses a fiber structure including a laminate, a first binding yarn, and a second binding yarn.

The laminate includes a first yarn layer in which a plurality of first yarns extending in a first direction are arranged in a second direction, which is a direction perpendicular to the first direction, and a first yarn layer in which a plurality of second yarns extending in a second direction are arranged in the first direction. and a second yarn layer arranged in plural numbers. The laminate is formed by laminating the first yarn layer and the second yarn layer in a third direction that is perpendicular to both the first direction and the second direction. In the laminate, second yarn layers are arranged at both ends in the third direction. The first thread and the second thread are reinforcing fiber threads.

The first binding yarn and the second binding yarn are each arranged between adjacent first yarns in the second direction. The first binding yarn and the second binding yarn are each engaged with a plurality of second yarns of the second yarn layer located at both ends in the third direction. Thereby, the first yarn layer and the second yarn layer stacked in the third direction are combined. The outer diameter of each of the first binding thread and the second binding thread is smaller than the outer diameter of each of the first thread and the second thread. That is, the first binding thread and the second binding thread are thinner than the first thread and the second thread.

JP2017-106128A

When the second thread is a reinforced fiber thread as in the above fiber structure, the coefficient of friction on the surface of the second thread is relatively small, so the second thread slips against the first binding thread and the second binding thread. Cheap. Further, when the first binding yarn and the second binding yarn are thinner than the second yarn, the binding force of the first binding yarn and the second binding yarn on the second yarn becomes weaker. Therefore, if the tension of the first binding yarn and the tension of the second binding yarn are different, in the second yarn layer located at both ends in the third direction, the second binding yarn that is restrained by the binding yarn with weaker tension The yarn may shift in the first direction during weaving. When the second yarn shifts in the first direction, a gap is created between the second yarns adjacent in the first direction. When a fiber-reinforced composite material is manufactured using a fiber structure in which gaps are formed in this way, the strength of the fiber-reinforced composite material may be reduced due to the gaps.

A fiber structure for a fiber-reinforced composite material for solving the above-mentioned problems is provided with a fiber structure in which a plurality of first reinforcing fiber threads extending in a first direction are arranged in a second direction, which is a direction orthogonal to the first direction. one yarn layer and a second yarn layer in which a plurality of second reinforcing fiber yarns extending in the second direction are arranged in the first direction in a direction perpendicular to both the first direction and the second direction. A laminate that is laminated in a certain third direction and has the second yarn layer located at both ends in the third direction, and is arranged between the first reinforcing fiber yarns that are adjacent to each other in the second direction. , between a first binding yarn engaged with the second reinforcing fiber yarn of the second yarn layer located at the first end in the third direction and the first reinforcing fiber yarn adjacent in the second direction. and a second binding yarn engaged with the second reinforcing fiber yarn of the second yarn layer located at a second end opposite to the first end in the third direction; , the second yarn layer located at the first end in the third direction extends in the second direction between the second reinforcing fiber yarns adjacent in the first direction, and The second yarn layer has a first auxiliary yarn engaged with the yarn and is located at the second end in the third direction. a second auxiliary yarn extending in two directions and engaged with the first binding yarn, each of the first binding yarn, the second binding yarn, the first auxiliary yarn, and the second auxiliary yarn; has an outer diameter smaller than the respective outer diameters of the first reinforcing fiber yarn and the second reinforcing fiber yarn, and the first auxiliary yarn and the second auxiliary yarn overlap in the third direction. The gist is:

In the second yarn layer located at the first end in the third direction, between the second reinforcing fiber yarns adjacent in the first direction, there is a first auxiliary yarn whose outer diameter is smaller than the outer diameter of the second reinforcing fiber yarn. is provided. Therefore, compared to the case where the second reinforcing fiber yarn is provided at the position of the first auxiliary yarn, the interval between the second reinforcing fiber yarns adjacent to each other in the first direction becomes narrower. Further, in the second yarn layer located at the second end in the third direction, between the second reinforcing fiber yarns adjacent in the first direction, the outer diameter of the second reinforcing fiber yarns is smaller than the outer diameter of the second reinforcing fiber yarns. An auxiliary thread is provided. Therefore, compared to the case where the second reinforcing fiber yarn is provided at the position of the second auxiliary yarn, the interval between the second reinforcing fiber yarns adjacent to each other in the first direction becomes narrower.

As a result, the relationship between the portions of the first binding yarn that sandwich the second auxiliary yarn from both sides approaches parallelism, making it difficult for the second auxiliary yarn to shift in the first direction. Furthermore, when the relationship between the portions of the first binding yarn that sandwich the second auxiliary yarn from both sides approaches parallel, the relationship between the portions that sandwich the second reinforcing fiber yarn from both sides also approaches parallel. Therefore, the second reinforcing fiber yarn of the second yarn layer located at the first end in the third direction also becomes difficult to shift in the first direction.

Similarly, the relationship between the portions of the second binding yarn that sandwich the first auxiliary yarn from both sides becomes nearly parallel, making it difficult for the first auxiliary yarn to shift in the first direction. Moreover, when the relationship between the portions of the second binding yarn that sandwich the first auxiliary yarn from both sides approaches parallel, the relationship between the portions that sandwich the second reinforcing fiber yarn from both sides also approaches parallel. Therefore, the second reinforcing fiber yarn of the second yarn layer located at the second end in the third direction also becomes difficult to shift in the first direction.

Therefore, in the second yarn layer located at both ends in the third direction, gaps are less likely to occur between the second reinforcing fiber yarns adjacent in the first direction. As a result, it is possible to suppress a decrease in strength of the fiber reinforced composite material manufactured using the fiber structure for fiber reinforced composite material.

In the fiber structure for a fiber-reinforced composite material, each of the first reinforcing fiber yarn and the second reinforcing fiber yarn may be a continuous yarn.
With the above configuration, the strength of the fiber reinforced composite material is improved compared to the case where the first reinforcing fiber yarn and the second reinforcing fiber yarn are each spun yarns.

In the fiber structure for a fiber-reinforced composite material, each of the first reinforcing fiber yarn and the second reinforcing fiber yarn may be a round yarn having a circular cross-sectional shape.
In the above configuration, there is no need for a special yarn feeding device that is required when the first reinforcing fiber yarn and the second reinforcing fiber yarn are flat yarns with an elliptical cross-sectional shape. can be used.

In the fiber structure for a fiber-reinforced composite material, both the first binding yarn and the second binding yarn may be arranged between the first reinforcing fiber yarns adjacent in the second direction.
In the above configuration, compared to the case where the first binding yarn and the second binding yarn are arranged alternately in the second direction via the first reinforcing fiber yarn, the second binding yarn is located at both ends in the third direction. Displacement of the second reinforcing fiber yarn in the layer can be further controlled.

In the fiber structure for a fiber-reinforced composite material, each of the first binding yarn, the second binding yarn, the first auxiliary yarn, and the second auxiliary yarn may be a round yarn having a circular cross-sectional shape. good.
In the above configuration, the first binding yarn, the second binding yarn, the first auxiliary yarn, and the second auxiliary yarn are each a flat yarn with an elliptical cross-sectional shape, compared to the case where the The proportion of the reinforcing fiber yarn and the second reinforcing fiber yarn can be increased.

A fiber-reinforced composite material for solving the above problems is a fiber-reinforced composite material in which a fiber structure is composited in a matrix, wherein the fiber structure is the fiber for fiber-reinforced composite material according to claim 1. The gist is that it is a structure.

In the second yarn layer located at the first end in the third direction, between the second reinforcing fiber yarns adjacent in the first direction, there is a first auxiliary yarn whose outer diameter is smaller than the outer diameter of the second reinforcing fiber yarn. is provided. Therefore, compared to the case where the second reinforcing fiber yarn is provided at the position of the first auxiliary yarn, the interval between the second reinforcing fiber yarns adjacent to each other in the first direction becomes narrower. Further, in the second yarn layer located at the second end in the third direction, between the second reinforcing fiber yarns adjacent in the first direction, the outer diameter of the second reinforcing fiber yarns is smaller than the outer diameter of the second reinforcing fiber yarns. An auxiliary thread is provided. Therefore, compared to the case where the second reinforcing fiber yarn is provided at the position of the second auxiliary yarn, the interval between the second reinforcing fiber yarns adjacent to each other in the first direction becomes narrower.

As a result, the relationship between the portions of the first binding yarn that sandwich the second auxiliary yarn from both sides approaches parallelism, making it difficult for the second auxiliary yarn to shift in the first direction. Furthermore, when the relationship between the portions of the first binding yarn that sandwich the second auxiliary yarn from both sides approaches parallel, the relationship between the portions that sandwich the second reinforcing fiber yarn from both sides also approaches parallel. Therefore, the second reinforcing fiber yarn of the second yarn layer located at the first end in the third direction also becomes difficult to shift in the first direction.

Similarly, the relationship between the portions of the second binding yarn that sandwich the first auxiliary yarn from both sides becomes nearly parallel, making it difficult for the first auxiliary yarn to shift in the first direction. Moreover, when the relationship between the portions of the second binding yarn that sandwich the first auxiliary yarn from both sides approaches parallel, the relationship between the portions that sandwich the second reinforcing fiber yarn from both sides also approaches parallel. Therefore, the second reinforcing fiber yarn of the second yarn layer located at the second end in the third direction also becomes difficult to shift in the first direction.

Therefore, in the second yarn layer located at both ends in the third direction, gaps are less likely to occur between the second reinforcing fiber yarns adjacent in the first direction. As a result, it is possible to suppress a decrease in strength of the fiber reinforced composite material in which the fiber structure for fiber reinforced composite material is composited in the matrix.

According to the present invention, it is possible to suppress a decrease in strength of a fiber-reinforced composite material.

It is a perspective view showing a fiber reinforced composite material in an embodiment. It is a perspective view showing a fiber structure in an embodiment. It is a sectional view showing a fiber structure in an embodiment. It is a sectional view showing a fiber structure in an embodiment. It is a sectional view showing a fiber structure in a modification.

An embodiment of a fiber structure for a fiber-reinforced composite material and a fiber-reinforced composite material will be described below with reference to FIGS. 1 to 4. The fiber structure for fiber reinforced composite material is a fiber structure used for fiber reinforced composite material. Hereinafter, the "fibrous structure for fiber-reinforced composite material" will be simply referred to as "fibrous structure."

As shown in FIG. 1, the fiber-reinforced composite material 10 is formed by combining a fiber structure 11 into a matrix 12. The fiber structure 11 is a reinforced base material of the fiber reinforced composite material 10. The matrix 12 is, for example, a thermosetting epoxy resin.

As shown in FIG. 2, the fiber structure 11 includes a laminate 20, a plurality of first binding threads 31, and a plurality of second binding threads 32.
<Laminated body>
The laminate 20 has one or more first yarn layers 21 and two or more second yarn layers 22. The fiber structure 11 of this embodiment has two first yarn layers 21 and two second yarn layers 22.

The first yarn layer 21 has warp yarns 23 as first reinforcing fiber yarns. The warp threads 23 extend linearly along the first direction X. A plurality of warp threads 23 are arranged in a second direction Y, which is a direction perpendicular to the first direction X. That is, the first yarn layer 21 is formed by arranging a plurality of warps 23 extending in the first direction X in the second direction Y. The second yarn layer 22 has weft yarns 24 as second reinforcing fiber yarns. The weft 24 extends linearly along the second direction Y. A plurality of weft yarns 24 are arranged in the first direction X.

The laminate 20 is formed by laminating the first yarn layer 21 and the second yarn layer 22 in a third direction Z, which is a direction perpendicular to both the first direction X and the second direction Y. ing. The second thread layer 22 is arranged at both ends of the laminate 20 in the third direction Z. The laminate 20 of the present embodiment has a second yarn layer 22, a first yarn layer 21, a first yarn layer from a first end in the third direction Z toward a second end located opposite to the first end. 21, the second yarn layer 22 is formed by laminating them in this order. Therefore, the two second yarn layers 22 that the laminate 20 of this embodiment has are the second yarn layers 22 located at both ends in the third direction Z.

The distance between adjacent warp yarns 23 in the second direction Y is the same in each first yarn layer 21. In the laminate 20, the positions of the warp yarns 23 in the second direction Y are the same in each first yarn layer 21. Therefore, the warps 23 of each first yarn layer 21 overlap in the third direction Z. Further, the distance between adjacent weft yarns 24 in the first direction X is the same in each second yarn layer 22. In the laminate 20, the position of the weft yarn 24 in the first direction X is the same in each second yarn layer 22. Therefore, the wefts 24 of each second yarn layer 22 overlap in the third direction Z.

The second yarn layer 22 located at the first end in the third direction Z includes a plurality of first auxiliary yarns 25 in addition to a plurality of weft yarns 24 . Each first auxiliary thread 25 extends linearly along the second direction Y. The plurality of first auxiliary yarns 25 are arranged in the first direction X. The first auxiliary yarn 25 is arranged between adjacent weft yarns 24 in the first direction X. In other words, the second yarn layer 22 located at the first end in the third direction Z is formed by alternately arranging the weft yarns 24 and the first auxiliary yarns 25 extending in the second direction Y in the first direction X. ing.

The second yarn layer 22 located at the second end in the third direction Z includes a plurality of second auxiliary yarns 26 in addition to the plurality of weft yarns 24 . Each second auxiliary thread 26 extends linearly along the second direction Y. The plurality of second auxiliary threads 26 are arranged in the first direction X. The second auxiliary yarn 26 is arranged between adjacent weft yarns 24 in the first direction X. In other words, the second yarn layer 22 located at the second end in the third direction Z is formed by alternately arranging the weft yarns 24 and the second auxiliary yarns 26 extending in the second direction Y in the first direction X. ing.

The interval between the first auxiliary yarns 25 adjacent in the first direction X in the second yarn layer 22 located at the first end in the third direction Z is This is the same as the interval between the second auxiliary yarns 26 adjacent to each other in the first direction X. In the laminate 20, the position of the first auxiliary yarn 25 in the first direction X is the same as the position of the second auxiliary yarn 26 in the first direction X. Therefore, the first auxiliary yarn 25 and the second auxiliary yarn 26 overlap in the third direction Z.

<First binding thread>
The plurality of first binding threads 31 are arranged in the second direction Y. The first binding thread 31 is arranged between the warp threads 23 adjacent to each other in the second direction Y.

As shown in FIG. 3, the first binding yarn 31 has a plurality of first weft engaging parts 31a, a plurality of first auxiliary yarn engaging parts 31b, and a plurality of first connecting parts 31c. . The first weft engaging portion 31a is a portion that is engaged with the weft 24 of the second yarn layer 22 located at the first end in the third direction Z. The first weft engaging portion 31a is formed by folding back the first binding yarn 31 so as to pass outside the weft 24 of the second yarn layer 22 located at the first end in the third direction Z. The first auxiliary yarn engaging portion 31b is a portion that is engaged with the second auxiliary yarn 26 of the second yarn layer 22 located at the second end in the third direction Z. The first auxiliary yarn engaging portion 31b is formed by folding back the first binding yarn 31 so as to pass outside the second auxiliary yarn 26 of the second yarn layer 22 located at the second end in the third direction Z. ing. The first connecting portion 31c is a portion that connects the first weft engaging portion 31a and the first auxiliary yarn engaging portion 31b. The first connecting portion 31c extends in the third direction Z between the weft yarn 24 and the auxiliary yarns 25 and 26 that are adjacent to each other in the first direction X. In the first binding yarn 31, the first weft engaging portions 31a and the first auxiliary yarn engaging portions 31b are alternately repeated via the first connecting portions 31c. The first binding thread 31 is engaged with the plurality of wefts 24 of the second thread layer 22 located at the first end in the third direction Z, and is engaged with the plurality of wefts 24 of the second thread layer 22 located at the first end in the third direction Z. 22 of the plurality of second auxiliary threads 26 are engaged.

<Second binding thread>
As shown in FIG. 2, the plurality of second binding threads 32 are arranged in the second direction Y. The second binding thread 32 is arranged between the warp threads 23 adjacent to each other in the second direction Y. In this embodiment, both the first binding thread 31 and the second binding thread 32 are arranged between the warp threads 23 adjacent to each other in the second direction Y.

As shown in FIG. 4, the second binding yarn 32 has a plurality of second weft engagement sections 32a, a plurality of second auxiliary yarn engagement sections 32b, and a plurality of second connection sections 32c. . The second weft engaging portion 32a is a portion that is engaged with the weft 24 of the second yarn layer 22 located at the second end in the third direction Z. The second weft engagement portion 32a is formed by folding back the second binding yarn 32 so as to pass outside the weft 24 of the second yarn layer 22 located at the second end in the third direction Z. The second auxiliary yarn engaging portion 32b is a portion that is engaged with the first auxiliary yarn 25 of the second yarn layer 22 located at the first end in the third direction Z. The second auxiliary thread engaging portion 32b is formed by folding back the second binding thread 32 so as to pass outside the first auxiliary thread 25 of the second thread layer 22 located at the first end in the third direction Z. ing. The second connecting portion 32c is a portion that connects the second weft engaging portion 32a and the second auxiliary yarn engaging portion 32b. The second connecting portion 32c extends in the third direction Z between the weft yarn 24 and the auxiliary yarns 25 and 26 that are adjacent to each other in the first direction X. In the second binding yarn 32, the second weft engaging portions 32a and the second auxiliary yarn engaging portions 32b are alternately repeated via the second connecting portions 32c. The second binding yarn 32 is engaged with the plurality of wefts 24 of the second yarn layer 22 located at the second end in the third direction Z, and the second binding yarn 32 is engaged with the plurality of wefts 24 of the second yarn layer 22 located at the second end in the third direction Z. 22 of the plurality of first auxiliary threads 25 are engaged.

The second thread layer 22 located at the first end in the third direction Z and the second thread layer 22 located at the second end in the third direction Z are connected by a first binding thread 31 and a second binding thread 32. has been done. As a result, two first yarn layers, which are yarn layers located between the second yarn layer 22 located at the first end in the third direction Z and the second yarn layer 22 located at the second end in the third direction Z, Thread layer 21 is also bonded. That is, the first binding yarn 31 and the second binding yarn 32 bind the first yarn layer 21 and the second yarn layer 22 that constitute the laminate 20.

<Details of each thread>
The warp yarns 23 and the weft yarns 24 are each reinforced fiber yarns. The reinforcing fiber of this embodiment is carbon fiber. The warp yarns 23 and the weft yarns 24 of this embodiment are continuous yarns. The warp threads 23 and the weft threads 24 of this embodiment are flat threads with an elliptical cross-sectional shape. In this embodiment, the threads used for each of the warp threads 23 and the weft threads 24 are the same thread.

The first binding thread 31 and the second binding thread 32 of this embodiment are each made of phenoxy resin. The first binding yarn 31 and the second binding yarn 32 of this embodiment are spun yarns. The first binding thread 31 and the second binding thread 32 of this embodiment are round threads with a circular cross-sectional shape. The outer diameter of each of the first binding thread 31 and the second binding thread 32 is smaller than the outer diameter of each of the warp threads 23 and the weft threads 24. That is, the first binding yarn 31 and the second binding yarn 32 are thinner than the warp yarns 23 and the weft yarns 24.

The first auxiliary yarn 25 of this embodiment is a spun yarn. The first auxiliary yarn 25 of this embodiment is a round yarn with a circular cross-sectional shape. The outer diameter of the first auxiliary thread 25 is smaller than the outer diameter of each of the warp threads 23 and the weft threads 24. Specifically, the outer diameter of the first auxiliary thread 25 is smaller than the short diameter of each of the warp threads 23 and the weft threads 24. In other words, the first auxiliary yarn 25 is thinner than the warp yarns 23 and the weft yarns 24.

The outer diameter of the first auxiliary thread 25 is preferably equal to or less than the outer diameter of the second binding thread 32. “The outer diameter of the first auxiliary thread 25 is less than or equal to the outer diameter of the second binding thread 32” means that the outer diameter of the first auxiliary thread 25 is the same as the outer diameter of the second binding thread 32; This includes a case where the outer diameter of the auxiliary thread 25 is smaller than the outer diameter of the second binding thread 32. The outer diameter of the first auxiliary thread 25 in this embodiment is the same as the outer diameter of the second binding thread 32.

The material of the first auxiliary thread 25 is preferably the same as the material of the second binding thread 32. “The material of the first auxiliary thread 25 is the same as the material of the second binding thread 32” includes the case where the material of the first auxiliary thread 25 is the same as the material of the second binding thread 32. Moreover, "the material of the first auxiliary thread 25 is equivalent to the material of the second binding thread 32" means that the material of the first auxiliary thread 25 and the second binding thread 32 are the same, and the second binding thread 32 is This also includes the case where the material of the first auxiliary thread 25 is slightly different from the material of the second binding thread 32 within a range where the coefficient of friction of the first auxiliary thread 25 does not change. The first auxiliary thread 25 of this embodiment is a thread made of phenoxy resin. Therefore, in this embodiment, the material of the first auxiliary thread 25 is the same as the material of the second binding thread 32.

The second auxiliary yarn 26 of this embodiment is a spun yarn. The second auxiliary yarn 26 of this embodiment is a round yarn with a circular cross-sectional shape. The outer diameter of the second auxiliary thread 26 is smaller than the outer diameter of each of the warp threads 23 and the weft threads 24. Specifically, the outer diameter of the second auxiliary thread 26 is smaller than the short diameter of each of the warp threads 23 and the weft threads 24. In other words, the second auxiliary yarn 26 is thinner than the warp yarns 23 and the weft yarns 24.

The outer diameter of the second auxiliary thread 26 is preferably equal to or less than the outer diameter of the first binding thread 31. “The outer diameter of the second auxiliary thread 26 is less than or equal to the outer diameter of the first binding thread 31” means that the outer diameter of the second auxiliary thread 26 is the same as the outer diameter of the first binding thread 31; This includes a case where the outer diameter of the auxiliary thread 26 is smaller than the outer diameter of the first binding thread 31. The outer diameter of the second auxiliary thread 26 in this embodiment is the same as the outer diameter of the first binding thread 31.

The material of the second auxiliary thread 26 is preferably the same as the material of the first binding thread 31. “The material of the second auxiliary thread 26 is the same as the material of the first binding thread 31” includes the case where the material of the second auxiliary thread 26 is the same as the material of the first binding thread 31. Furthermore, “the material of the second auxiliary thread 26 is the same as the material of the first binding thread 31” means that the second auxiliary thread 26 and the first binding thread 31 are made of the same material. This also includes the case where the material of the second auxiliary thread 26 is slightly different from the material of the first binding thread 31, as long as the coefficient of friction of the second auxiliary thread 26 does not change. The second auxiliary thread 26 of this embodiment is a thread made of phenoxy resin. Therefore, in this embodiment, the material of the second auxiliary thread 26 is the same as the material of the first binding thread 31.

In this embodiment, the threads used for each of the first auxiliary thread 25, the second auxiliary thread 26, the first binding thread 31, and the second binding thread 32 are the same thread.
[Actions and effects of this embodiment]
The operation and effects of this embodiment will be explained.

(1) In the second yarn layer 22 located at the first end in the third direction Z, between the weft yarns 24 adjacent in the first direction 25 are provided. Therefore, compared to the case where the weft yarn 24 is provided at the position of the first auxiliary yarn 25, the interval between the weft yarns 24 adjacent to each other in the first direction X becomes narrower. Further, in the second yarn layer 22 located at the second end in the third direction Z, between the weft yarns 24 adjacent to each other in the first direction is provided. Therefore, compared to the case where the weft yarn 24 is provided at the position of the second auxiliary yarn 26, the interval between the weft yarns 24 adjacent to each other in the first direction X becomes narrower.

As a result, the relationship between the first connecting portions 31c that sandwich the second auxiliary yarn 26 from both sides in the first binding yarn 31 approaches parallelism, so that the second auxiliary yarn 26 becomes difficult to shift in the first direction X. Furthermore, when the relationship between the first connecting portions 31c that sandwich the second auxiliary yarn 26 from both sides in the first binding yarn 31 approaches parallel, the relationship between the first connecting portions 31c that sandwich the weft yarn 24 from both sides also approaches parallel. Therefore, the weft 24 of the second yarn layer 22 located at the first end in the third direction Z is also less likely to shift in the first direction X.

Similarly, since the relationship between the second connecting portions 32c that sandwich the first auxiliary thread 25 from both sides in the second binding thread 32 approaches parallelism, the first auxiliary thread 25 becomes difficult to shift in the first direction X. Furthermore, when the relationship between the second connecting portions 32c that sandwich the first auxiliary yarn 25 from both sides approaches parallel, the relationship between the second connecting portions 32c that sandwich the weft yarn 24 from both sides also approaches parallel. Therefore, the weft 24 of the second yarn layer 22 located at the second end in the third direction Z also becomes difficult to shift in the first direction X.

Therefore, in the second yarn layer 22 located at both ends in the third direction Z, gaps are less likely to occur between the weft yarns 24 adjacent in the first direction X. As a result, a decrease in strength of the fiber reinforced composite material 10 manufactured using the fiber structure 11 can be suppressed.

(2) The first auxiliary yarn 25 and the second auxiliary yarn 26 overlap in the third direction Z. As a result, the weft 24 of the second yarn layer 22 located at the first end in the third direction Z and the weft 24 of the second yarn layer 22 located at the second end in the third direction Z also move in the third direction Z. They tend to overlap. Therefore, the performance of the fiber reinforced composite material 10 can be brought close to the designed performance.

(3) The warp threads 23 and the weft threads 24 are each continuous threads. Therefore, the strength of the fiber-reinforced composite material 10 is improved compared to the case where the warp yarns 23 and the weft yarns 24 are each spun yarns.
(4) Both the first binding thread 31 and the second binding thread 32 are arranged between the warp threads 23 adjacent to each other in the second direction Y. Therefore, compared to the case where the first binding yarn 31 and the second binding yarn 32 are arranged alternately in the second direction Y via the warp threads 23, the second yarn layer located at both ends in the third direction Z The displacement of the weft yarn 24 at the weft 22 can be further controlled.

(5) The first binding thread 31, the second binding thread 32, the first auxiliary thread 25, and the second auxiliary thread 26 are each round threads. Therefore, compared to the case where the first binding yarn 31, the second binding yarn 32, the first auxiliary yarn 25, and the second auxiliary yarn 26 are flat yarns, the warp 23 and the weft 24 in the fiber reinforced composite material 10 can increase the proportion of

(6) The material of the first auxiliary thread 25 is the same as the material of the second binding thread 32. Therefore, the displacement of the first auxiliary thread 25 can be more restricted than when the material of the first auxiliary thread 25 is different from the material of the second binding thread 32. Further, the material of the second auxiliary thread 26 is the same as that of the first binding thread 31. Therefore, compared to the case where the material of the second auxiliary thread 26 is different from the material of the first binding thread 31, the displacement of the second auxiliary thread 26 can be more restricted.

(7) The outer diameter of the first auxiliary thread 25 is less than or equal to the outer diameter of the second binding thread 32. Therefore, compared to the case where the outer diameter of the first auxiliary thread 25 is larger than the outer diameter of the second binding thread 32, the displacement of the first auxiliary thread 25 can be more restricted. Further, the outer diameter of the second auxiliary thread 26 is equal to or smaller than the outer diameter of the first binding thread 31. Therefore, compared to the case where the outer diameter of the second auxiliary thread 26 is larger than the outer diameter of the first binding thread 31, the displacement of the second auxiliary thread 26 can be further restricted.

(8) The plurality of first auxiliary yarns 25 are arranged in the second yarn layer 22 located at the first end in the third direction Z. Therefore, in the second yarn layer 22 located at the first end in the third direction Z, the gap between the weft yarns 24 adjacent in the first direction X can be reduced. Therefore, the displacement of the weft yarns 24 of the second yarn layer 22 located at the first end in the third direction Z can be further restricted. Further, the plurality of second auxiliary yarns 26 are arranged within the second yarn layer 22 located at the second end in the third direction Z. In this case, in the second yarn layer 22 located at the second end in the third direction Z, the gap between the weft yarns 24 adjacent in the first direction X can be reduced. Therefore, the displacement of the weft yarns 24 of the second yarn layer 22 located at the first end in the third direction Z can be further restricted.

(9) The threads used for each of the warp threads 23 and the weft threads 24 are the same thread. Moreover, the threads used for each of the first auxiliary thread 25, the second auxiliary thread 26, the first binding thread 31, and the second binding thread 32 are the same thread. Therefore, the fiber structure 11 can be manufactured by simply preparing two types of threads.

[Example of change]
Note that the above embodiment can be modified and implemented as follows. The above embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.

The warp yarns 23 and the weft yarns 24 may be spun yarns as long as they are reinforced fiber yarns.
The warp yarns 23 and the weft yarns 24 do not need to be flat yarns as long as they are reinforced fiber yarns.
For example, as shown in FIG. 5, each of the warp threads 23 and the weft threads 24 may be a round thread. In this case, a special yarn feeding device that is required when the warp yarns 23 and the weft yarns 24 are flat yarns is not required, so that a normal yarn feeding device can be used during weaving. Note that the normal yarn feeding device refers to, for example, a color selector device of a rapier loom or a main nozzle of an air jet loom.

Note that the cross-sectional shape of the warp yarns 23 and the cross-sectional shape of the weft yarns 24 may be different. Further, the cross-sectional shapes of the warp threads 23 and the weft threads 24 are not limited to an elliptical shape or a circular shape.
○ Both the first binding thread 31 and the second binding thread 32 may not be arranged between the warp threads 23 adjacent to each other in the second direction Y. For example, the first binding threads 31 and the second binding threads 32 may be alternately arranged in the second direction Y with the warp threads 23 interposed therebetween.

○ Each of the first binding thread 31 and the second binding thread 32 does not have to be a round thread. For example, each of the first binding thread 31 and the second binding thread 32 may be a flat thread. Note that the cross-sectional shape of the first binding thread 31 and the cross-sectional shape of the second binding thread 32 may be different. Further, the cross-sectional shapes of the first binding thread 31 and the second binding thread 32 are not limited to circular or elliptical shapes.

The outer diameter of the first auxiliary thread 25 may be larger than the outer diameter of the second binding thread 32, as long as it is smaller than the outer diameter of each of the warp threads 23 and the weft threads 24.
The outer diameter of the second auxiliary thread 26 may be larger than the outer diameter of the first binding thread 31 as long as it is smaller than the outer diameter of each of the warp threads 23 and the weft threads 24.

○ Each of the first auxiliary thread 25 and the second auxiliary thread 26 does not have to be a round thread. For example, each of the first auxiliary thread 25 and the second auxiliary thread 26 may be a flat thread. Note that the cross-sectional shape of the first auxiliary thread 25 and the cross-sectional shape of the second auxiliary thread 26 may be different. Further, the cross-sectional shapes of the first auxiliary yarn 25 and the second auxiliary yarn 26 are not limited to circular or elliptical shapes.

○ The matrix 12 is not limited to epoxy resin. Matrix 12 may be other thermosetting resins, such as vinyl ester resins, unsaturated polyester resins, phenolic resins, etc., for example. Further, the matrix 12 may be a thermoplastic resin such as polyamide, polybutylene terephthalate, polycarbonate, polyethylene, polypropylene, polyimide resin, ABS resin, or the like.

○ Reinforcing fibers are not limited to carbon fibers. The reinforcing fibers may be glass fibers, silicon carbide ceramic fibers, aramid fibers, ultra-high molecular weight polyethylene fibers, or the like.
The materials of the first binding thread 31, the second binding thread 32, the first auxiliary thread 25, and the second auxiliary thread 26 are not limited to phenoxy resin. The material of the first binding thread 31, the second binding thread 32, the first auxiliary thread 25, and the second auxiliary thread 26 may be, for example, nylon.

The material of the first auxiliary thread 25 does not have to be the same as the material of the second binding thread 32.
The material of the second auxiliary thread 26 does not have to be the same as the material of the first binding thread 31.
○ If the laminate 20 is formed from one or more first yarn layers 21 and two or more second yarn layers 22, then the laminate 20 is formed from two first yarn layers 21 and two second yarn layers 22. It does not have to be formed. However, it is assumed that the second yarn layer 22 is located at both ends of the laminate 20 in the third direction Z.

For example, the laminate 20 may be one in which two first yarn layers 21 and three second yarn layers 22 are alternately laminated in the third direction Z. In this case, the laminate 20 has a second thread layer 22 located between the first thread layers 21 in the third direction Z, in addition to the second thread layers 22 located at both ends in the third direction Z. The second yarn layer 22 located between the first yarn layers 21 in the third direction Z does not need to have the plurality of auxiliary yarns 25. That is, the second thread layer 22 located between the first thread layers 21 in the third direction Z only needs to be formed of the plurality of wefts 24.

- By changing the interval between the auxiliary yarns 25 and 26 in the first direction X, the interval between the weft yarns 24 in the first direction X can be adjusted. Specifically, by increasing the interval between the auxiliary yarns 25 and 26 in the first direction X, the interval between the weft yarns 24 in the first direction X can be increased. By narrowing the gap between the auxiliary yarns 25 and 26 in the first direction X, the gap between the weft yarns 24 in the first direction X can be narrowed.

DESCRIPTION OF SYMBOLS 10... Fiber reinforced composite material, 11... Fiber structure as a fiber structure for fiber reinforced composite material, 12... Matrix, 20... Laminated body, 21... First yarn layer, 22... Second yarn layer, 23... First Warp as reinforcing fiber yarn, 24... Weft as second reinforcing fiber yarn, 25... First auxiliary yarn, 26... Second auxiliary yarn, 31... First binding yarn, 32... Second binding yarn, X... First direction, Y...second direction, Z...third direction.

Claims (6)

A first yarn layer in which a plurality of first reinforcing fiber yarns extending in a first direction are arranged in a second direction that is perpendicular to the first direction; A plurality of second yarn layers arranged in the first direction are laminated in a third direction that is perpendicular to both the first direction and the second direction, and at both ends in the third direction, a laminate in which the second yarn layer is located;
A second reinforcing fiber yarn disposed between the first reinforcing fiber yarns adjacent in the second direction and engaged with the second reinforcing fiber yarn of the second yarn layer located at the first end in the third direction. 1 binding thread;
The second yarn layer is arranged between the first reinforcing fiber yarns adjacent in the second direction, and is located at a second end opposite to the first end in the third direction. a second binding yarn engaged with the second reinforcing fiber yarn;
Equipped with
The second yarn layer located at the first end in the third direction extends in the second direction between the second reinforcing fiber yarns adjacent in the first direction, and engages with the second binding yarn. has a first auxiliary thread,
The second yarn layer located at the second end in the third direction extends in the second direction between the second reinforcing fiber yarns adjacent in the first direction, and engages with the first binding yarn. has a second auxiliary thread,
The outer diameter of each of the first binding yarn, the second binding yarn, the first auxiliary yarn, and the second auxiliary yarn is smaller than the outer diameter of each of the first reinforcing fiber yarn and the second reinforcing fiber yarn. Also small,
A fiber structure for a fiber-reinforced composite material, wherein the first auxiliary yarn and the second auxiliary yarn overlap in the third direction. The fiber structure for a fiber-reinforced composite material according to claim 1, wherein each of the first reinforcing fiber yarn and the second reinforcing fiber yarn is a continuous yarn. The fiber structure for a fiber-reinforced composite material according to claim 1, wherein each of the first reinforcing fiber yarn and the second reinforcing fiber yarn is a round yarn having a circular cross-sectional shape. The fiber structure for a fiber-reinforced composite material according to claim 1, wherein both the first binding yarn and the second binding yarn are arranged between the first reinforcing fiber yarns adjacent in the second direction. . The fiber structure for a fiber-reinforced composite material according to claim 1, wherein each of the first binding yarn, the second binding yarn, the first auxiliary yarn, and the second auxiliary yarn is a round yarn with a circular cross-sectional shape. body. A fiber-reinforced composite material in which a fiber structure is composited in a matrix, the fiber structure being the fiber structure for a fiber-reinforced composite material according to claim 1.

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