JPH07144371A - High damping carbon fiber reinforced resin composite material - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention is directed to a carbon fiber reinforced resin composite material (CFR).
P) without impairing the heat resistance, chemical resistance, various elastic moduli, and specific rigidity, that is, without lowering the elastic modulus and specific rigidity by further adding or substituting components other than carbon fiber,
It is an object of the present invention to provide a CFRP having improved vibration damping properties. According to the present invention, a set of carbon fiber bundles in which a plurality of carbon fiber bundles of a plurality of grades having different elastic moduli that are aligned in one direction are distributed substantially uniformly and adjacent to each other is provided. The carbon fiber reinforced resin composite material is composed of a matrix resin phase, which is impregnated into these spaces and solidified to mechanically bond them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fishing rod, a golf club,
Sports and leisure equipment such as rackets and bicycle frames, general industrial equipment such as rolls and shafts, actuating arms, machine frames, vehicle bodies and drive / transmission members, ship hulls and drive / transmission members, and aerospace structures. The present invention relates to CFRP that can be used for objects and the like, and is particularly suitable for applications that require mechanical vibration damping properties as well as its light weight.

[0002]

2. Description of the Related Art Carbon fiber reinforced resin composite materials (hereinafter CFR
(Abbreviated as P) is a lightweight, high-strength, high-elasticity carbon fiber as a reinforcing fiber, which has a high specific strength and a high specific rigidity and a relatively high vibration damping ability. It has been applied to structural members that reduce energy due to vibration and vibration to protect human bodies and products, and structural members that move at high speed and require a high degree of positioning accuracy.

Currently, the mainstream carbon fibers used in high-performance CFRP are PAN-based carbon fibers produced from polyacrylonitrile (PAN) fibers and pitch-based carbon fibers produced from carbonaceous pitch. is there. Each of them has a form of a fiber bundle of about 500 to 24,000 due to the manufacturing convenience and the like, and various grades having different elastic moduli are available in a lineup. The difference in elastic modulus depending on the grade ranges from 15 to 80 t / mm ² , and an appropriate grade is selected according to the rigidity required for the member. On the other hand, with respect to the vibration damping property, there is little difference between grades, and the range of selection is limited because it depends on the elastic modulus.

CFRP is a specific strength among industrial materials,
It is excellent in specific rigidity and superior in vibration damping property to metallic materials such as steel and aluminum, but inferior to resins and aramid fiber reinforced resin composite materials.
As a method of improving this vibration damping property, a method of adding a viscoelastic material or a flexibility-imparting agent to the resin of the composite material (for example, JP-A-60-190351 and JP-A-2-17).
224), a method of adding a viscoelastic material layer inside the composite material (for example, Japanese Patent Application Laid-Open No. 2-84329,
Japanese Patent Laid-Open No. 2-169634), and a method of partially substituting different types of reinforcing fibers such as aramid fiber and polyethylene fiber, which are more excellent in vibration damping than carbon fiber, and used together (for example, Japanese Patent Laid-Open No. 62-173730). , JP-A-63-
Japanese Patent No. 78734 and Japanese Patent Laid-Open No. 3-247223) have been proposed.

However, in the method, the heat resistance and chemical resistance inherent in the resin are lowered by the components added to the resin, and in the method, the thickness and weight are increased by the amount of the added viscoelastic material layer. Further, in any of the methods, the shear elastic modulus between the layers decreases due to the viscoelastic material between the fibers or between the layers, and thus the bending elastic modulus also decreases. In this method, the elastic modulus and specific rigidity of the composite material as a whole are lower than those of CFRP, and the vibration damping capacity has a value close to the arithmetic mean of that of the composite material consisting of each fiber type constituting the composite material. Absent.

As a form of the carbon fiber in the CFRP, there is one in which the carbon fiber is cut into several millimeters or less and is evenly dispersed in the resin. However, a high-performance CFRP that fully utilizes the original strength and elastic modulus of the carbon fiber is used. In many cases, the fiber bundles are not cut (so-called long fibers as they are) and arranged only in a predetermined direction in order to obtain them.

As a method for arranging the fiber bundle in a predetermined direction, a method in which a large number of fiber bundles are bundled and pulled out in one direction through a die (so-called pull-through method), or a fiber bundle is wound so as to sequentially cover the periphery of a cored bar. A method of stacking (so-called filament winding method), a method of winding a so-called prepreg sheet impregnated with resin in a state in which a large number of fiber bundles are aligned in one direction, a woven fabric, or a braided state (so-called Sheet winding method), a method of stacking prepreg sheets, woven fabric, etc. on the surface of the mold (so-called lay-up method) and the like are used. The plutotrusion method has a uniform cross-sectional shape and is suitable for fiber-reinforced applications in one direction. The filament winding method and the sheet winding method have a laminated structure with a closed curved surface in cross section, and can form layers corresponding to a plurality of stresses. The layup method has a laminated structure having a flat cross section or an open curved surface, and can form layers corresponding to a plurality of stresses.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a CFRP without impairing heat resistance, chemical resistance, various elastic moduli, and specific rigidity.
That is, it is an object of the present invention to provide a CFRP having improved vibration damping properties without causing a decrease in elastic modulus or specific rigidity due to further addition or substitution of components other than carbon fiber.

[0009]

According to the present invention, a large number of carbon fiber bundles of a plurality of grades having different elastic moduli that are aligned in one direction are distributed substantially uniformly and adjacently to each other. It is a carbon fiber reinforced resin composite material composed of an aggregate composed of fiber bundles and a matrix resin phase impregnated in these spaces and solidified to mechanically bond them.

That is, (1) the carbon fiber reinforced resin composite material of the present invention is a carbon fiber reinforced resin comprising a set of a large number of carbon fiber bundles aligned in one direction and a matrix resin filled in these spaces. In a composite material, this set of carbon fiber bundles is composed by arranging carbon fiber bundles of a plurality of grades having different elastic moduli substantially evenly, and the vibration damping ratio of this is the same as that of this resin. Which is composed of a single-grade carbon fiber bundle, and has a value higher than the vibration damping rate of any carbon fiber-reinforced resin composite material in which the volume ratio of the resin and the fiber is equal to this. It is a carbon fiber reinforced resin composite material.

In this case, a reinforcing layer composed of carbon fiber bundles aligned in a direction intersecting with the carbon fiber bundle direction aligned in the above-mentioned one direction is provided on the outer periphery and / or the inner periphery of the carbon fiber reinforced resin composite material. It may be a carbon fiber reinforced resin composite material formed by laminating one or more layers.

(2) The carbon fiber-reinforced resin composite material of the present invention comprises a carbon fiber bundle aligned in a specific direction,
In a carbon fiber reinforced resin composite material formed by laminating one or more layers of matrix resin filled in these spaces, at least one layer of the lamination is a plurality of grades of carbon fiber bundles having different elastic moduli within each layer. In the same direction, the vibration damping factors are such that the carbon fiber bundles of the plurality of grades constituting this are replaced by the carbon fiber bundles of a single grade, The carbon fiber reinforced resin composite material is characterized in that it has a value higher than the vibration damping ratio of any carbon fiber reinforced resin composite material in which the volume ratio of the fibers is equal to this.

In this case, in the carbon fiber reinforced resin composite material in which the direction of the fiber bundle of each layer is aligned symmetrically with respect to a specific axis as the whole of the layered structure, at least two layers of the layered structure are the above (2). It is preferable that the carbon fiber reinforced resin composite material is configured as described above and the directions of the fiber bundles intersect each other. In the carbon fiber reinforced resin composite material in which the direction of the fiber bundle of each layer is aligned symmetrically to a specific axis as a whole of the lamination, at least one layer having a direction of the fiber bundle substantially parallel to the axis is ,
A carbon fiber reinforced resin composite material configured as described in (2) above may be used.

Further, (3) the carbon fiber reinforced resin composite material of the present invention is a laminate of two or more layers of carbon fiber bundles aligned in a specific direction and a matrix resin filled in these spaces. In the carbon fiber reinforced resin composite material formed by the above, the carbon fiber bundles of the layers that are adjacent to each other have the same arranging direction, and each layer consists of a single elastic modulus grade, and the elastic modulus that is different between the adjacent layers. By virtue of being made of a grade of, the vibration damping rate thereof replaces the carbon fiber bundles of the plurality of grades constituting this with a single grade carbon fiber bundle, and the volume ratio of the resin and the fiber is equal to this. It is a carbon fiber reinforced resin composite material having a value higher than the vibration damping rate of any carbon fiber reinforced resin composite material.

In this case, in the carbon fiber reinforced resin composite material comprising a laminate in which the directions of the fiber bundles of the respective layers are aligned symmetrically with respect to a specific axis as a whole of the laminate, at least two pairs of the laminates have the above (3). It is preferable that the carbon fiber reinforced resin composite material is configured as described in (1) above, and the direction of the pair of fiber bundles symmetrically intersects with the specific axis. In a carbon fiber reinforced resin composite material composed of laminated layers in which the direction of the fiber bundle of each layer is aligned symmetrically with respect to a specific axis as a whole of the lamination, at least two layers having a direction of the fiber bundle substantially parallel to the axis. However, a carbon fiber reinforced resin composite material configured as described in (3) above may be used.

The carbon fiber bundle used in the present invention is composed of pitch-based or PAN-based carbon fibers, and generally 200 to 240 single fibers having a diameter of 4 μm or more and 15 μm or less.
It consists of a bundle of 00 pieces. The carbon fiber bundles of a plurality of grades preferably have a tensile elastic modulus of 150 GPa or more 8
A fiber bundle (A) having a fineness of 20 GPa or less and a mass per unit length of 20 mg / m or more and 3500 mg / m or less, and a tensile modulus of 170 GPa or more and 820 GPa or less and a fineness of 20 mg / m or more and 3500 mg. / M or less fiber bundle (B), fiber bundle (A) and fiber bundle (B)
Is a combination of two grades or more in which the difference in tensile elastic modulus is 20 GPa or more and the fineness ratio is in the range of 1: 5 to 5: 1. Optimally, the tensile modulus should be 150 GPa or more 7
50 GPa or less and fineness of 200 mg / m or more and 800 mg
/ M or less fiber bundle (A) and tensile modulus of 200 GP
a or more and 820 GPa or less and a fiber bundle (B) having a fineness of 200 mg / m or more and 800 mg / m or less, and a difference in tensile elastic modulus between the fiber bundle (A) and the fiber bundle (B) is 100 GPa or more, Fineness ratio in the range of 1: 2 to 2: 1 2
It is a combination of grades. In the present invention, the tensile elastic modulus of the fiber is a value obtained by the resin-impregnated strand method defined in JIS R7601 and has the same meaning as the tensile elastic modulus of the fiber bundle. The volume ratio of the resin to the fiber is a fiber volume content (%), preferably 30 to 80%, more preferably 50 to 70%.

The matrix resin used in the present invention is
It may be any of thermosetting resins such as epoxy and polyester, and thermoplastic resins such as polyamide and polyphenylene sulfide. Also, since the vibration damping properties of fiber-reinforced composite materials differ greatly depending on the matrix resin used, the absolute value cannot be determined by the fiber grade alone, but the fiber vibration coefficient of the mechanical vibration of the unidirectionally reinforced composite material using the same resin The difference is preferably 0.2 points or less.

The greater the difference between the elastic moduli of a plurality of grades, especially of both grades, the higher the vibration damping property is obtained.
It is preferable to determine the optimum combination of grades and compounding ratio in consideration of the elastic modulus required for the FRP member and other factors such as strength characteristics. The number of fibers in the fiber bundle, that is, the thickness of the fiber bundle is selected in accordance with the above-mentioned blending ratio, but a plurality of fiber bundles thinner than that may be tied together or combined to meet the above-mentioned blending ratio.

The loss factor of mechanical vibration described in the present invention is a value η obtained by the following equation from the envelope of the damping curve in free vibration. δ = (1 / N) ln (A ₀ / A _N ) η = (δ / π) × 100 (%) where δ: logarithmic decay rate, A ₀ : initial amplitude, A _N : amplitude after N cycles, N: Period, π: Circumferential ratio However, A ₀ / A _N is about 2 The CFRP of the present invention does not require a special device for manufacturing, and a conventional method for molding long fiber FRP can be used.

The arrangement structure and manufacturing method of the fiber bundle in the CFRP of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a conceptual diagram of a cross section in a direction perpendicular to the fiber bundle of the CFRP of the present invention having no layer structure. The fiber bundles 1 and 2 are substantially uniformly dispersed in the matrix resin 3 and are arranged so as to be substantially adjacent to each other. This structure can be manufactured by using the pultrusion method or the like. Since the lateral direction of CFRP aligned only in one direction is significantly weaker than the fiber bundle direction, hollow shaped members such as round pipes and square pipes have their outer and / or inner circumferences It can be reinforced with an FRP having a fiber bundle in a direction intersecting with the fiber bundle direction. CFRP is preferable for reinforcement in terms of specific rigidity and specific strength.

FIG. 2 shows that a carbon fiber bundle 1 having a low elastic modulus grade and a carbon fiber bundle 2 having a high elastic modulus grade are aligned in the same layer in the same direction and are dispersedly arranged so as to be adjacent to each other. FIG. 6 is a conceptual diagram of the structure of the CFRP of the present invention having a layered structure. The unidirectional prepreg sheet illustrated in FIG. 5 and / or the woven fabric or braid illustrated in FIG. 6 can be used for the sheet winding method and the layup method. The directions of the fiber bundles of different layers are selected according to the stress of the member and may intersect.

In FIG. 3, a carbon fiber bundle 1 of a low elastic modulus grade is aligned in the same direction in the same layer, and a carbon fiber bundle 2 of a high elastic modulus grade is the same in other layers adjacent to this layer. FIG. 3 is a conceptual diagram of the structure of the CFRP of the present invention having a layered structure in which a pair of layers are arranged in the same layer so as to be aligned in the same direction. The directions of the fiber bundles of different pairs of layers are selected according to the stress of the member and may intersect. That is, since CFRP, which has a layered structure and is composed of long fibers, has a significantly lower strength and elastic modulus in the lateral direction than the fiber bundle direction, the fiber bundles are arranged in a plurality of directions according to the direction of stress generated in the member. To do. Further, the plurality of directions are arranged so as to be line-symmetric in the total molding thickness with respect to a specific axis in order to suppress the distortion of the member due to the thermal stress at the time of molding. A small amount of glass fiber or the like may be used in combination for the purpose of increasing the strength between fiber bundles and improving the handleability of the prepreg. This structure can be manufactured using a filament winding method, a sheet winding method, or a layup method.

FIG. 4 is a side view showing the concept of the manufacturing method by the pultrusion method. Reference numeral 9 is a bobbin group consisting of carbon fiber bundles 1 having a low elastic modulus grade and carbon fiber bundles 2 having a high elastic modulus grade, which are substantially equal in number. From this, carbon fiber bundle 1
The carbon fiber bundle 2 and the carbon fiber bundle 2 are drawn out and arranged two-dimensionally alternately through the aligning reeds 4, and then introduced into the impregnation tank 3'to impregnate the resin 3 therein, and then the heated die 5 is drawn out to have a predetermined cross-sectional shape. And further heated in the heating furnace 6 to mold. 7 is a drive device for pulling the fiber bundle at a constant speed,
Reference numeral 8 is a device for cutting the molded CFRP into a predetermined length.

FIG. 5 is a conceptual diagram of an example of the unidirectional prepreg sheet used for manufacturing the structure illustrated in FIG. 2, and the apparatus illustrated in FIG. The high-grade carbon fiber bundles 2 are alternately aligned and arranged in one direction and impregnated with resin to form a sheet.

FIG. 6 is a conceptual view of a structure of a woven fabric or a braid in which warp yarns and / or weft yarns are alternately arranged with a carbon fiber bundle 1 of a low elastic modulus grade and a carbon fiber bundle 2 of a high elastic modulus grade. It is also possible to impregnate this with a resin to make a cross prepreg.

FIG. 7 is a side view showing the concept of the method for manufacturing the unidirectional prepreg sheet illustrated in FIG. Reference numeral 9 is a bobbin group consisting of carbon fiber bundles 1 having a low elastic modulus grade and carbon fiber bundles 2 having a high elastic modulus grade, which are substantially equal in number. From this, the carbon fiber bundle 1 and the carbon fiber bundle 2 are drawn out and arranged one-dimensionally through the aligning reeds 4, and then the resin coated paper 10 is introduced from both sides and impregnated with the resin by the heating and pressing roller 11, and the bobbin Take up to 12.

FIG. 8 is a conceptual diagram of a manufacturing method of the CFRP having the structure illustrated in FIG. 2 by the filament winding method. A plurality of equal number carbon fiber bundles 1 of low elastic modulus grade and carbon fiber bundles 2 of high elastic modulus grade are alternately arranged through the aligned reeds 4 and then impregnated with resin 3 to form a feed eye. It is wound around the cored bar (mandrel) 13 via the, and then the resin is heated to form the laminated structure illustrated in FIG.

[0028]

According to the CFRP of the present invention, it is possible to enhance the vibration damping due to the tensile or compression in the lengthwise direction of the fiber bundle, the shearing load and the bending load perpendicular to the lengthwise direction of the fiber bundle. According to the CFRP structure of the present invention, there is disclosed in JP-A-60-190351.
As described in JP-A-2-169634 and JP-A-2-169634, a viscoelastic material is added to CFRP, or JP-A-3-2-3.
As shown in Japanese Patent No. 47223, the effect of high vibration damping can be exhibited without adding the high vibration damping fiber composite material.

Although the detailed reason is not clear, it is considered as follows. That is, the vibration damping of the member is caused by the fact that the external force energy applied to the member is changed into elastic strain energy of the member when the member is deformed and is partially radiated as heat energy. The vibration damping properties of fiber-reinforced resin composite materials are dominated by the irreversibility of the matrix resin, and it is considered that this is due in part to the minute elements that make up the composite material, that is, the friction between the fibers and the resin. To be If the specific gravity and elastic modulus of the fiber itself are small and the irreversibility is large, it is considered that the vibration damping property is naturally increased accordingly.

In the case of the present invention, carbon fibers of a grade having substantially the same specific gravity and vibration damping property but different elastic moduli as shown in Table 2 are arranged adjacent to each other without adding a viscoelastic material or a fiber having large irreversibility. This enhances vibration damping. When a load of axial force or bending force in the length direction of a fiber bundle is applied to a member in which fibers with different elastic moduli are arranged adjacent to each other, those with a high elastic modulus against the average deformation of the member have a small elongation and a small elastic modulus. It is considered that the lower ones take the deviation with larger elongation. That is, for the resin that binds the fibers whose deformation amounts are deviated next to each other,
In addition to the average deformation of the member, it is considered that shear deformation is applied by the difference in the deviation amount between fibers having different elastic moduli.
In other words, in the composite material structure of the present invention, it is considered that the matrix resin is deformed more than it seems and the vibration damping property is enhanced.

[0031]

[Examples] Vibration damping performance was measured by attaching a foil resistance wire strain gauge to a CFRP sample. (Example 1) As shown in Table 1, pitch-based so-called 2
A carbon fiber bundle A of 0 ton grade and a carbon fiber bundle B of 50 ton grade were used and impregnated and cured with an unsaturated polyester resin as a matrix. Diameter 6 mm and length 500 m
A solid CFRP rod shown in Table 2 having m and a fiber volume content of 55% was obtained (see FIG. 1). Using this as a sample, the self-damping characteristics of free vibration against impact bending load were measured. In this measurement, the sample was kept horizontal and the nodes in the primary vibration mode were suspended with a rubber thread. As a comparative example, carbon fiber A alone,
Alternatively, the CFRP rods shown in Table 2 were molded in the same manner except that B was used alone, and the same self-damping characteristics were measured.
The results are shown in Table 2. Regarding the physical properties of the composite material In this example, it is apparent that the vibration loss coefficient is larger than that of either the plain A or the plain B (comparative example), and the vibration damping property is remarkably improved.

[0032]

[Table 1]

[0033]

[Table 2]

(Example 2) As shown in Table 3, PAN-based so-called 30 ton grade carbon fiber bundles A and 50 were used.
UD in which ton grade carbon fiber bundles B are alternately arranged
Three layers of prepreg sheets are arranged in a direction of ± 45 ° with respect to the axis direction of the core metal, and a UD prepreg sheet consisting only of the carbon fiber bundle A is provided outside the prepreg sheet by a four-layer sheet winding method in a direction of 0 degrees with respect to the axis direction of the core metal. 12.5mm-5mm, length 12
It was wound around a cored bar having a taper of 00 mm, and a CFRP pipe having a structure shown in FIG. 11 having an inner diameter corresponding to this and a wall thickness of about 1.5 mm and a length of 1140 mm was obtained (see FIG. 2). As a comparative example, a CFRP pipe was molded in the same manner except that the UD prepreg sheets each having only the carbon fiber bundle A or only the carbon fiber bundle B in the ± 45 ° direction had three layers.

For the vibration damping performance, the sample was placed vertically to measure the vibration damping of the shear load, the thick end side was securely fixed with a vise, and the arm with an inertia moment of 600 g / mm ² was attached to the thin end side for rotation. As a pendulum, the self-damping characteristic of free vibration with respect to impact load when the torsional load was rapidly removed was measured. These results are shown in Table 4 and FIGS. 9 (a) and 9 (b).
Shown in. Also in this example, it is clear that the vibration loss coefficient is larger than that of either the plain A or the plain B (comparative example), and the vibration damping property is remarkably improved.

[0036]

[Table 3]

[0037]

[Table 4]

(Example 3) As shown in Table 5, a UD prepreg sheet A in which a PAN-based so-called 24 ton grade carbon fiber bundle has an epoxy resin as a matrix and a pitch-based so-called 50 ton grade carbon fiber bundle into an epoxy resin are used. Alternating UD prepreg sheets B having a matrix of 2 layers in the direction of 0 ° with respect to the axial direction of the core metal, and UD prepreg sheets consisting of only the carbon fiber bundles B inside this in the direction of ± 45 ° with respect to the axial direction of the core metal. Each two-layer sheet winding method wraps around a core metal with an outer diameter of 25 mm and an inner diameter of 25
mm, an outer diameter of about 28 mm, and a length of 1200 mm were obtained (FIG. 3). As a comparative example, U of only the carbon fiber bundle A or only the carbon fiber bundle B in the 0 ° direction is used.
CFR is used in the same manner except that 4 layers of D prepreg sheet are used.
A P pipe was molded.

These were horizontally suspended at the nodes of the primary vibration mode with a rubber thread, and the self-damping characteristic of free vibration against the impact load of bending was measured. These results are shown in Table 6 and FIG.
0 (a) and (b). Also in this example, it is apparent that the vibration loss coefficient is larger than that of either the plain A or the plain B (comparative example), and the vibration damping property is remarkably improved.

[0040]

[Table 5]

[0041]

[Table 6]

[0042]

INDUSTRIAL APPLICABILITY According to the present invention, CF is added by adding different materials.
CF without degrading various performance that RP originally has
The vibration damping property of RP can be improved. The industrial robot using the arm according to the present invention can achieve high speed and high positioning accuracy without lowering the bending rigidity and increasing the weight in the related art, and the tennis racket using the frame according to the present invention has a high rigidity. The present invention contributes to improving the performance of sports equipment, industrial machinery, transportation equipment, aerospace equipment, etc. by reducing the obstacles of the player's arm due to the impact at the time of hitting the ball without reducing the weight or increasing the weight.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a first CFRP structure according to the present invention.

FIG. 2 is a schematic perspective view showing a second CFRP structure (a bundle A layer and a bundle B layer are present in each layer) according to the present invention.

FIG. 3 is a schematic perspective view showing a third CFRP structure (adjacent pair layers are a bundle A layer and a bundle B layer) according to the present invention.

FIG. 4 is a schematic side view showing a pultrusion method for producing a CFRP according to the present invention.

FIG. 5 is a schematic perspective view showing a second CFRP structure (a bundle A layer and a bundle B layer are present in each layer) according to the present invention with respect to a prepreg sheet.

FIG. 6 is a schematic plan view (a), a front view (b) and a side view (c) showing a woven fabric in which carbon fiber bundles of different grades are alternately arranged in warp yarns or weft yarns in the present invention.

FIG. 7 is a schematic side view showing a filament winding method for producing a CFRP (unidirectional prepreg sheet) according to the present invention.

FIG. 8 is a schematic side view showing a filament winding method for manufacturing a second CFRP structure (FIG. 2) according to the present invention.

FIG. 9 is a vibration damping curve diagram of the present invention example (a) and a B-only corresponding comparative example (b) in Example 2.

FIG. 10 is a vibration damping curve diagram of the present invention example (a) and a B-only corresponding comparative example (b) in Example 3.

FIG. 11 is a developed perspective view showing an example (Example 2) of a CFRP pipe according to the present invention.

FIG. 12 is a developed perspective view showing an example (Example 3) of a CFRP pipe according to the present invention.

[Explanation of symbols]

 1: Fiber bundle (grade with low elastic modulus) 2: Fiber bundle (grade with high elastic modulus) 3: Resin 3 ': Impregnation tank 4: Aligning reed 5: Die 6: Heating furnace 7: Driving device 8: Cutting device 9: Bobbin group 10: Resin coated paper 11: Heating / pressurizing roller 12: Bobbin 13: Core type (mandrel)

Claims (8)

[Claims] 1. In a carbon fiber reinforced resin composite material comprising a set of a large number of carbon fiber bundles aligned in one direction and a matrix resin filled in these spaces, the set of carbon fiber bundles is elastic. It consists of carbon fiber bundles of different grades that are distributed almost uniformly, and its vibration damping ratio is the same as that of the resin and the carbon fiber bundle of the single grade in which it is composed. A carbon fiber reinforced resin composite material, which is made of and has a value higher than the vibration damping rate of any carbon fiber reinforced resin composite material in which the volume ratio of the resin and the fiber is equal to this. 2. Carbon aligned in a direction intersecting with the carbon fiber bundle direction aligned in the one direction on at least one of the outer periphery and the inner periphery of the carbon fiber reinforced resin composite material according to claim 1. A carbon fiber reinforced resin composite material formed by laminating one or more reinforcing layers made of fiber bundles. 3. A carbon fiber reinforced resin composite material comprising a stack of one or more layers of carbon fiber bundles aligned in a specific direction and a matrix resin filled in these spaces, and at least the stacking thereof. One layer is composed of a plurality of grades of carbon fiber bundles having different elastic moduli disposed in the same direction in each layer and adjacent to each other, and the vibration damping ratio of the plurality of grades of carbon constituting the layers. Characterized in that it replaces the fiber bundle with a single grade carbon fiber bundle in it, which has a value higher than the vibration damping rate of any carbon fiber reinforced resin composite material, in which the volume ratio of resin and fiber is equal Carbon fiber reinforced resin composite material. 4. A carbon fiber reinforced resin composite material in which the directions of the fiber bundles in each layer are aligned symmetrically with respect to a specific axis as a whole of the lamination, and at least two layers are comprised of claim 3 and these fibers A carbon fiber reinforced resin composite material in which the directions of the bundles intersect each other. 5. A carbon fiber reinforced resin composite material in which the direction of the fiber bundle for each layer is aligned symmetrically with respect to a specific axis as a whole of the lamination, and the layer has a direction of the fiber bundle substantially parallel to the axis. 4. A carbon fiber reinforced resin composite material, wherein at least one layer thereof is composed of claim 3. 6. A carbon fiber reinforced resin composite material comprising a carbon fiber bundle aligned in a specific direction and two or more reinforcing layers composed of a matrix resin filled in these spaces, which are adjacent to each other. The carbon fiber bundles of the layers forming a pair have the same arranging direction, and each layer is composed of a single elastic modulus grade, and adjacent layers are composed of different elastic modulus grades. The carbon fiber bundles of multiple grades that compose the above are replaced with the carbon fiber bundles of a single grade, and the volume ratio of resin and fiber is equal to this, higher than the vibration damping rate of any carbon fiber reinforced resin composite material. A carbon fiber reinforced resin composite material characterized by having a value. 7. A carbon fiber reinforced resin composite material comprising a laminate in which the directions of the fiber bundles in each layer are aligned symmetrically with respect to a specific axis as a whole of the laminate, and at least two pairs of the laminate consist of claim 6. A carbon fiber reinforced resin composite material in which the directions of the pair of fiber bundles intersect each other symmetrically with respect to the specific axis. 8. A carbon fiber reinforced resin composite material comprising a laminate in which the direction of the fiber bundle of each layer is aligned symmetrically to a specific axis as a whole of the laminate, and the direction of the fiber bundle is substantially parallel to the axis. A carbon fiber reinforced resin composite material comprising at least two layers according to claim 6.