阅读说明：本技术 针织物和在针织物中浸渗基体树脂而成的纤维增强树脂 (Knitted fabric and fiber-reinforced resin obtained by impregnating knitted fabric with matrix resin ) 是由 三宅一实 芦边伸介 于 2019-05-22 设计创作，主要内容包括：本发明提供提高纤维增强树脂的能量吸收特性的纤维的针织物、使用针织物的纤维增强树脂。针织物(2)具有：分别横编编织且以线圈列相互对置的方式配置的第1针织物部(5)和第2针织物部(6)；织入第1和第2针织物部的连结线圈列(7)。连结线圈列具有：第1连结线圈列(7A),交替织入第1针织物部和第2针织物部,隔着1个线圈间隔织入第1针织物部中的2个以上线圈,隔着1个线圈间隔织入第2针织物部中的2个以上线圈；第2连结线圈列(7B),与第1连结线圈列相邻,交替织入第1针织物部和第2针织物部,隔着1个线圈间隔织入第1针织物部中的与第1连结线圈列不同的2个以上线圈,隔着1个线圈间隔织入第2针织物部中的与第1连结线圈列不同的2个以上线圈。(The invention provides a fiber-reinforced resin knitted fabric having improved energy absorption characteristics, and a fiber-reinforced resin using the knitted fabric. The knitted fabric (2) has: a 1 st knitted fabric portion (5) and a 2 nd knitted fabric portion (6) which are knitted in a flat manner and arranged so that the stitch rows face each other; the connected stitch row (7) of the 1 st and 2 nd knitted fabric portions is knitted in. The connection coil row has: a 1 st connected stitch row (7A) in which a 1 st knitted fabric portion and a 2 nd knitted fabric portion are alternately knitted, 2 or more stitches that are knitted in the 1 st knitted fabric portion with 1 stitch interval therebetween, and 2 or more stitches that are knitted in the 2 nd knitted fabric portion with 1 stitch interval therebetween; and a 2 nd connected stitch row (7B) adjacent to the 1 st connected stitch row, wherein the 1 st knitted fabric portion and the 2 nd knitted fabric portion are alternately knitted, 2 or more stitches different from the 1 st connected stitch row in the 1 st knitted fabric portion are knitted with 1 stitch interval therebetween, and 2 or more stitches different from the 1 st connected stitch row in the 2 nd knitted fabric portion are knitted with 1 stitch interval therebetween.)

1. A knitted fabric of fibers constituting a fiber-reinforced resin together with a matrix resin, the knitted fabric comprising:

A 1 st knitted fabric portion and a 2 nd knitted fabric portion which are respectively knitted by flat knitting and are arranged so that stitch rows face each other, and

A connected stitch row knitted into the 1 st knitted fabric portion and the 2 nd knitted fabric portion respectively for joining the 1 st knitted fabric portion and the 2 nd knitted fabric portion,

The connected stitch row includes a 1 st connected stitch row and a 2 nd connected stitch row, the 1 st connected stitch row being alternately knitted into the 1 st knitted fabric portion and the 2 nd knitted fabric portion, and being knitted into 2 or more stitches in the 1 st knitted fabric portion with 1 stitch interval therebetween, and being knitted into 2 or more stitches in the 2 nd knitted fabric portion with 1 stitch interval therebetween; the 2 nd connected row is adjacent to the 1 st connected row, is alternately knitted into the 1 st knitted fabric portion and the 2 nd knitted fabric portion, is knitted into 2 or more stitches of the 1 st knitted fabric portion different from the 1 st connected row with 1 stitch interval therebetween, and is knitted into 2 or more stitches of the 2 nd knitted fabric portion different from the 1 st connected row with 1 stitch interval therebetween,

The 1 st coupled coil row and the 2 nd coupled coil row are formed in a plurality of groups at predetermined intervals along the vertical row.

2. The knitted fabric according to claim 1, wherein the 1 st connected row and the 2 nd connected row are formed of knitting yarns that are continuous with each other.

3. The knitted fabric according to claim 1, wherein the 1 st knitted fabric portion, the 2 nd knitted fabric portion, and the connected row are formed of knitting yarns which are continuous with each other.

4. The knitted fabric according to claim 1, wherein both ends of the 1 st knitted fabric portion and the 2 nd knitted fabric portion in the wale direction are joined to each other to form a tubular shape.

5. The knitted fabric according to claim 1, wherein 1 of the 1 st knitted fabric portion and the 2 nd knitted fabric portion is knitted with 2 stitch intervals therebetween.

6. The knitted fabric according to claim 5, wherein the 1 st knitted fabric portion and the 2 nd knitted fabric portion have 3 continuous rows of courses, the 1 st connected course, and the 2 nd connected course in the described order.

7. A fiber-reinforced resin obtained by impregnating the knitted fabric according to any one of claims 1 to 6 with a matrix resin.

Technical Field

The present invention relates to a knitted fabric and a fiber-reinforced resin obtained by impregnating the knitted fabric with a matrix resin.

Background

It is known to form a center pillar of an automobile with a carbon fiber reinforced resin (for example, patent document 1). The carbon fiber reinforced resin constituting the center pillar includes a woven material in which carbon fibers are oriented in a woven form in a vehicle exterior side portion, and a UD (unidirectional) material in which the directions of the carbon fibers are aligned in a vehicle interior side portion.

Disclosure of Invention

Problems to be solved by the invention

Fiber-reinforced resins using a textile material as a reinforcing fiber have high tensile strength and compressive strength, but it is known that the tensile strength and compressive strength decrease sharply and break after the yield point is reached. If the fiber-reinforced resin does not break even after reaching the yield point and can continuously absorb energy, the range of application as a structural material can be expanded.

In view of the above background, an object of the present invention is to provide a fiber knitted fabric capable of improving the energy absorption characteristics of a fiber-reinforced resin. The invention also provides a fiber-reinforced resin using the knitted fabric.

Means for solving the problems

In order to solve the above problem, one aspect of the present invention relates to a knitted fabric (2) of fibers that constitute a fiber-reinforced resin (1) together with a matrix resin (3), the knitted fabric including: a 1 st knitted fabric portion (5) and a 2 nd knitted fabric portion (6) which are knitted in a flat manner and which are arranged so that the stitch rows face each other; and a connected stitch row (7) knitted into the 1 st knitted fabric portion and the 2 nd knitted fabric portion, respectively, for joining the 1 st knitted fabric portion and the 2 nd knitted fabric portion, the connected stitch row having a 1 st connected stitch row (7A) and a 2 nd connected stitch row (7B), the 1 st connected stitch row (7A) being alternately knitted into the 1 st knitted fabric portion and the 2 nd knitted fabric portion and being knitted into 2 or more stitches in the 1 st knitted fabric portion with 1 stitch interval therebetween, and being knitted into 2 or more stitches in the 2 nd knitted fabric portion with 1 stitch interval therebetween, the 2 nd connected stitch row (7B) being adjacent to the 1 st connected stitch row, being alternately knitted into the 1 st knitted fabric portion and the 2 nd knitted fabric portion, being knitted into 2 or more stitches in the 1 st knitted fabric portion with 1 stitch interval therebetween, which are different from the 1 st connected stitch row, and 2 or more stitches different from the 1 st connected stitch row in the 2 nd knitted fabric portion are knitted with 1 stitch interval therebetween, and a plurality of sets of the 1 st connected stitch row and the 2 nd connected stitch row are formed along the wale with a predetermined interval therebetween.

According to this configuration, a fiber-reinforced resin knitted fabric having improved energy absorption characteristics can be provided. The fiber-reinforced resin using the knitted fabric has a tensile strength and a compressive strength which are gradually decreased after reaching a yield point, and can absorb energy even after reaching the yield point, as compared with a fiber-reinforced resin using a woven fabric material.

In the above aspect, the 1 st coupled stitch row and the 2 nd coupled stitch row may be formed by knitting yarns that are continuous with each other. The 1 st knitted fabric portion, the 2 nd knitted fabric portion, and the connected row may be formed of knitting yarns that are continuous with each other.

According to these configurations, the knitted fabric can be formed using continuous knitting yarns, and the structure of the knitted fabric can be simplified.

In the above aspect, the 1 st knitted fabric portion and the 2 nd knitted fabric portion may be joined to each other at both ends in the course direction to form a tubular shape.

With this configuration, energy can be absorbed for the relative movement of the 1 st knitted fabric portion and the 2 nd knitted fabric portion in the plane direction. This can improve the tensile strength and the compressive strength.

In the above aspect, 1 stitch row may be knitted with 2 stitch intervals between the 1 st knitted fabric portion and the 2 nd knitted fabric portion. The 1 st knitted fabric portion and the 2 nd knitted fabric portion may have 3 continuous rows of stitches, the 1 st connected row of stitches, and the 2 nd connected row of stitches in the described order.

Another aspect of the present invention relates to a fiber-reinforced resin (1) obtained by impregnating the knitted fabric with a matrix resin.

Effects of the invention

According to the above configuration, a fiber-reinforced resin and a knitted fabric of fibers capable of improving the energy absorption property of the fiber-reinforced resin can be provided.

Drawings

Fig. 1 is a sectional view of a fiber reinforced resin of an embodiment.

Fig. 2 is a perspective view of a knitted fabric of the embodiment.

Fig. 3 is an explanatory view showing a knitting process of the knitted fabric of the embodiment.

FIG. 4 is a cross-sectional view of examples 1 to 3 and comparative examples 1 to 3.

Fig. 5 is an explanatory diagram illustrating a knitting process of the knitted fabric of example 3.

Fig. 6 is an explanatory diagram illustrating a knitting process of the knitted fabric of comparative example 2.

Fig. 7 is an explanatory diagram illustrating a knitting process of the knitted fabric of comparative example 3.

Fig. 8 is a graph showing the results of the compressive strength test.

Fig. 9 is a diagram for explaining the definition of the load lowering speed.

Fig. 10 is a graph showing the measurement results of the load drop speed when compressed from the X direction.

Fig. 11 is a graph showing the measurement results of the load drop speed when compressing from the Y direction.

Fig. 12 is a graph showing the results of the CAI test.

Detailed Description

Embodiments of the knitted fabric and the fiber-reinforced resin including the knitted fabric of the present invention will be described below. The knitted fabric constitutes a fiber-reinforced resin together with a matrix resin.

The fiber-reinforced resin 1 includes a knitted fabric 2 formed by knitting fibers and a matrix resin 3 impregnated in the knitted fabric 2. The knitting yarn of the knitted fabric 2 is, for example, glass fiber, carbon fiber, boron fiber, or aramid fiber. The knitting yarn is in the form of, for example, monofilament, multifilament, or twisted yarn. The matrix resin 3 is, for example, a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, or a vinyl ester resin, or a thermoplastic resin such as a nylon resin or an ABS resin. The thickness of the thread may be appropriately selected depending on the knitting machine to be used or the gauge (the number of needles per 1 inch) of the knitting machine, and the purpose of use.

As shown in fig. 2, the knitted fabric 2 has a 1 st knitted fabric portion 5 and a 2 nd knitted fabric portion 6 facing each other, and a connected stitch row 7 knitted into the 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6 respectively in order to join the 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6.

The 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6 are knitted in a flat manner and are opposed to each other so that the stitch rows are parallel to each other. The 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6 are joined to each other at both ends in the course direction to form a tubular shape. The 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6 are preferably formed of knitting yarns continuous with each other. In the 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6, 1 stitch row is preferably knitted with 2 stitch intervals.

The connected stitch row 7 includes a 1 st connected stitch row 7A along the stitch rows of the 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6, and a 2 nd connected stitch row 7B adjacent to the 1 st connected stitch row 7A in the wale. The 1 st connected row 7A is alternately knitted into the 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6. The 1 st connected row 7A is knitted into the 1 st knitted fabric portion 5 at a plurality of places with 1 stitch interval therebetween, and is knitted into the 2 nd knitted fabric portion 6 at a plurality of places with 1 stitch interval therebetween. The 2 nd connecting stitch row 7B is alternately knitted into the 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6. The 2 nd connected row 7B is knitted into 2 or more stitches of the 1 st knitted fabric portion 5 different from the 1 st connected row 7A at 1-stitch intervals, and is knitted into 2 or more stitches of the 2 nd knitted fabric portion 6 different from the 1 st connected row 7A at 1-stitch intervals.

In the 1 st connected row 7A, the stitches knitted into the 1 st knitted fabric portion 5 are preferably shifted in the row direction with respect to the stitches knitted into the 2 nd knitted fabric portion 6. That is, in the 1 st connected row 7A, it is preferable that the stitches knitted into the 1 st knitted fabric portion 5 do not face the stitches knitted into the 2 nd knitted fabric portion 6. Similarly, in the 2 nd connected row 7B, the stitches knitted into the 1 st knitted fabric portion 5 are preferably shifted in the row direction with respect to the stitches knitted into the 2 nd knitted fabric portion 6.

In another embodiment, in the 1 st connected row 7A, the stitches knitted into the 1 st knitted fabric portion 5 may be opposed to the stitches knitted into the 2 nd knitted fabric portion 6 (corresponding to example 3 described later). In the 2 nd connected row 7B, the stitches knitted into the 1 st knitted fabric portion 5 may be opposed to the stitches knitted into the 2 nd knitted fabric portion 6.

The 1 st coupled row 7A and the 2 nd coupled row 7B are preferably formed by knitting yarns that are continuous with each other. The 1 st knitted fabric portion 5, the 2 nd knitted fabric portion 6, and the connected row of stitches 7 are preferably formed of knitting yarns that are continuous with each other.

The 1 st and 2 nd connected courses 7A and 7B are formed in a plurality of sets at predetermined intervals along the wales in the 1 st and 2 nd knitted fabric portions 5 and 6. The 1 st knitted fabric portion 5 and the 2 nd knitted fabric portion 6 preferably have 3 continuous rows of courses, the 1 st connected course 7A, and the 2 nd connected course 7B in the described order along the wales.

Next, a knitting process of the knitted fabric 2 will be described with reference to fig. 3. The knitted fabric 2 can be knitted by, for example, a double needle bed flat knitting machine having a front needle bed FB and a rear needle bed BB extending in the left-right direction and facing each other in the front-rear direction. In fig. 3, a to O indicate knitting needles of the front needle bed FB and the rear needle bed BB. It should be noted that the number of needles is made smaller than the number used in actual knitting for the sake of easy understanding of the description. In the figure, white circles (o) indicate stitches formed on the knitting needles in the previous step, and black circles (●) indicate stitches knitted in the respective steps.

First, in step S1, the needle feed port 10 for supplying the knitting yarn is moved from the right side to the left side of the front needle bed FB, and the knitting yarn is hooked to the knitting needles of the front needle bed FB with 2 stitch intervals, and further, the needle feed port 10 is moved from the left side to the right side of the rear needle bed BB, and the knitting yarn is hooked to the knitting needles of the rear needle bed BB with 2 stitch intervals. At this time, the stitches formed on the knitting needles of the front needle bed FB and the stitches formed on the knitting needles of the rear needle bed BB are offset from each other in the direction of the row of stitches. The 1 st basic coil array 11 is formed in the 1 st step S1.

Next, in the 2 nd step S2, the feeder port 10 is moved from the right side to the left side of the front needle bed FB, and the knitting yarn is hooked to the knitting needle of the front needle bed FB other than the knitting needle of the 1 st step S1 with 2 stitch intervals, and further, the feeder port 10 is moved from the left side to the right side of the rear needle bed BB, and the knitting yarn is hooked to the knitting needle of the rear needle bed BB other than the knitting needle of the 1 st step S1 with 2 stitch intervals. At this time, the stitches formed on the knitting needles of the front needle bed FB and the stitches formed on the knitting needles of the rear needle bed BB are offset from each other in the direction of the row of stitches. The 2 nd basic coil array 12 is formed in the 2 nd step S2.

Next, in the 3 rd step S3, the feeder port 10 is moved from the right side to the left side of the front needle bed FB, and the knitting yarn is hooked to the knitting needle of the front needle bed FB other than the 1 st step S1 and the 2 nd step S2 with 2 stitch intervals, and further, the feeder port 10 is moved from the left side to the right side of the back needle bed BB, and the knitting yarn is hooked to the knitting needle of the back needle bed BB other than the 1 st step S1 and the 2 nd step S2 with 2 stitch intervals. At this time, the stitches formed on the knitting needles of the front needle bed FB and the stitches formed on the knitting needles of the rear needle bed BB are offset from each other in the direction of the row of stitches. The 3 rd basic coil array 13 is formed in the 3 rd step S3. The stitches are formed one by one on all the knitting needles by the 1 st to 3 rd basic stitch rows 11 to 13.

Next, in the 4 th step S4, the yarn feeder 10 is moved from the right side to the left side of the front needle bed FB and the rear needle bed BB, and the knitting yarn is alternately hooked to the knitting needles of the rear needle bed BB and the front needle bed FB. The knitting yarn is hooked on the knitting needle at the back needle bed BB at intervals of 1 stitch, and is hooked on the knitting needle at the front needle bed FB at intervals of 1 stitch. The stitches held by the knitting needles of the front needle bed FB and the stitches held by the knitting needles of the rear needle bed BB are offset to the left and right. The 1 st coupled coil row 7A is formed in the 4 th step S4.

next, in the 5 th step S5, the yarn feeder 10 is moved from the left side to the right side of the front needle bed FB and the rear needle bed BB, and knitting yarns are alternately hooked on the knitting needles of the front needle bed FB different from the 4 th step S4 and the knitting needles of the rear needle bed BB different from the 4 th step S4. The knitting yarn is hooked on the knitting needle at the front needle bed FB with 1 stitch interval therebetween, and is hooked on the knitting needle at the front needle bed FB with 1 stitch interval therebetween. The stitches held by the knitting needles of the front needle bed FB and the stitches held by the knitting needles of the rear needle bed BB are offset to the left and right. In step S5, the 2 nd coupled coil row 7B is formed. The stitches are formed one by one on all the knitting needles by the 1 st and 2 nd connected stitch rows 7A and 7B. The knitted fabric 2 is formed by repeating the above 1 st to 5 th steps S1 to S5.

The fiber-reinforced Resin 1 is formed by, for example, a Vacuum-assisted Resin injection Molding (VaRTM) method. In the vacuum-assisted resin injection molding method, the knitted fabric 2 is placed in a molding die, and the matrix resin 3 is introduced into the molding die by making the inside of the molding die vacuum, so that the knitted fabric 2 is impregnated with the matrix resin 3.

The effects of the knitted fabric 2 of the present embodiment and the fiber-reinforced resin 1 using the knitted fabric 2 will be described below by comparing examples 1 to 3 with comparative examples 1 to 4. Knitted fabrics 2 of examples 1 to 3 and comparative examples 1 to 3 were knitted using a seamless flatbed knitting machine SWG091N2(10 gauge) manufactured by seiko. In examples 1 to 3 and comparative examples 1 to 3, the structure of the knitted fabric 2 was different (fig. 3), and the other structures were the same. In examples 1 to 3 and comparative examples 1 to 3, the knitted fabric 2 was formed of a continuous knitting yarn and formed in a tubular shape. The knitting yarn was 675dtex multifilament yarn obtained by bundling glass fibers having a diameter of 9 μm. The matrix resin 3 is an epoxy resin. Comparative example 4 contains reinforcing fibers of a fabric (woven structure).