JP2019214915A - Plate material, plate material for rigid body origami structure, and foldable structure - Google Patents

Abstract

To provide a plate material for use in a rigid body origami structure by being rigid and light in weight, and a foldable structure composed of the plate material.SOLUTION: A plate material is constituted of: at least two hard composite parts (R) being fiber-reinforced resin composites composed of reinforcing fibers and first matrix resins; and substantially-linear soft composite parts (S) being bendable portions composed of reinforcing fibers and second matrix resins which are arranged while contacting with both a substantially-linear edge of one hard composite part (R) and a substantially-linear edge of the other hard composite part (R). A thickness T (m) of the hard composite part (R) and rotation torque Tr (Nm/m) per unit length of the soft composite part (S) by elastic restoration which is generated when folding the two hard composite parts (R) which adjoin each other with the soft composite parts (S) sandwiched therebetween by an angle of 90° with the same as an axis satisfy a relationship of 50<Tr/T<50000.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a board, and more particularly to a board for rigid origami structure and a foldable structure using the same.

  A structure using rigid origami can easily form a three-dimensional structure from a planar shape by a folding operation around a folding line. Since it can be reversibly folded and unfolded and can be transformed into a portable and storable size and shape by folding, it is expected to be applied to movable or variable buildings.

  In particular, when the in-plane arrangement of a polygon has a two-dimensional repeating pattern described by a pattern group, the origami structure is called origami tessellation, and it has excellent design and excellent control of folding deformation. Further, since the partially expanded structure has a high structural rigidity, there is an example in which the structure is used for structural reinforcement and used for a solar cell used in outer space. However, industrial applications are still limited.

  One of the reasons is that the rigid surface is made of a metal plate such as iron or aluminum in order to obtain the rigidity of the structure, and the rigid lines are joined by metal hinges to create a rigid origami structure. Because of its large size, it can be folded but is inferior in portability and has a large inertia, so that a large-scale mechanism is required to realize movability.

  An object of the present invention is to provide a plate material used for a rigid origami structure which is excellent in movability because it is robust and lightweight, and further aims to provide a foldable structure comprising the same.

The present invention relates to at least two rigid composite parts (R), which are fiber-reinforced resin composites comprising a reinforcing fiber and a first matrix resin, and a substantially linear edge of one rigid composite part (R). And a substantially linear soft composite material, which is disposed in contact with both of the substantially linear edges of the other hard composite material portion (R) and is a bendable portion composed of a reinforcing fiber and a second matrix resin. A plate material composed of a portion (S), a thickness T (m) of the hard composite material portion (R) and two hard composite material portions (R) adjacent to each other across the soft composite material portion (S). The rotational relation Tr (Nm / m) per unit length of the soft composite part (S) due to elastic recovery generated when the flexible composite part (S) is bent at 90 ° around the axis is represented by the following relational expression. It is a plate material characterized by satisfying.
50 <Tr / T <50000

The present invention also provides a plate member of a fiber-reinforced resin composite material comprising a reinforcing fiber and a first matrix resin, wherein a bendable portion substantially free of the first matrix resin is formed substantially linearly. A plate material in which a flexible composite material portion (S) is formed by partitioning a plate material of a fiber-reinforced resin composite material into a plurality of hard composite material portions (R) and filling a bendable portion with a second matrix resin. The thickness T (m) of the hard composite material part (R) and two adjacent hard composite material parts (R) sandwiching the soft composite material part (S) are bent 90 ° about the soft composite material part (S) as an axis. And a rotation torque Tr (Nm / m) per unit length of the soft composite material part (S) due to elastic recovery generated when the elastic member recovers, satisfying the following relational expression.
50 <Tr / T <50000
Further, an aspect of the present invention includes a hinge made of the above-mentioned plate material.

  ADVANTAGE OF THE INVENTION According to this invention, the board material used for the rigid origami structure which is excellent in movability can be provided by being lightweight although being robust, and also the foldable structure which consists of it can be provided.

It is a side view which shows the state which bent the hard composite material part (R) (b of a figure) of both sides more than the angle of 180 degrees centering on the soft composite material part (S) (a of a figure). It is a side view for explaining width B of soft composite material part (S), and thickness D of a gap. It is explanatory drawing of the apparatus which measures Tr / T. An arm (q) is vertically attached to the pedestal (p), and a load detection end (r) is installed horizontally at a position at a height h (m) from the pedestal surface. One hard composite part of the sample (s) is arranged so that the entire surface thereof is in contact with the pedestal (p), and is formed at an angle of 90 ° about the soft composite part (the length in the bending axis direction is A (m)). The other hard composite material part is bent so that its surface is perpendicular to the load detection end, and Tr / T is calculated using the load value G (N) detected at this time. It is an example of the bending line pattern of the rigid fold of the board material for rigid origami structure, and is a top view when a rigid fold is developed. In Example 3, this broken line pattern was used. 14 shows the cutout position and shape of a sample used for measurement in Example 3.

  In the plate material of the present invention, it is preferable that the hard composite material portion (R) and the soft composite material portion (S) contain the same continuous reinforcing fiber. This means an aspect in which the same reinforcing fiber penetrates both the hard composite material portion (R) and the soft composite material portion (S). When the reinforcing fiber is a reinforcing fiber woven fabric, the hard composite material portion (R) and the soft composite material portion (S) are preferably formed by using the reinforcing fiber woven fabric as a common reinforcing fiber.

  In the present invention, the width B of the soft composite material part (S) and two hard composite material parts (R) adjacent to each other with the soft composite material part (S) interposed therebetween are adjusted by 180 degrees with the soft composite material part (S) as an axis. Can be bent to an angle exceeding °. When bent beyond an angle of 180 °, a gap is formed in the vicinity of the soft composite material part (S). This state is shown in FIG. These voids prevent the hard composite parts (R) from coming into direct contact with each other near the soft composite parts (S).

In the present invention, the thickness T (m) of the hard composite material part (R) and the two hard composite material parts (R) adjacent to each other with the soft composite material part (S) interposed therebetween are combined with the soft composite material part (S). It is necessary that the rotational torque Tr (Nm / m) per unit length of the soft composite material part (S) due to elastic recovery caused by bending at 90 ° satisfies the following relational expression.
50 <Tr / T <50000
If Tr / T is less than or equal to 50, the restoring force when returning from the folded state to the plane is poor, and if it is greater than or equal to 50,000, folding becomes difficult. Tr / T is preferably from 100 to 10,000, more preferably from 400 to 5,000.

  Further, when bent at an angle of 180 °, a gap having a thickness D is generated between one hard composite material part (R) and the other hard composite material part (R). This state is shown in FIG. When the plate material of the present invention is used for the rigid origami structure, the gap can avoid the influence of the thickness of the hard composite material portion (R) and realize smooth folding.

In the present invention, the width B of the soft composite material portion (S) and the two hard composite material portions (R) adjacent to each other with the soft composite material portion (S) interposed therebetween are 180 ° about the soft composite material portion (S) as an axis. It is preferable that the thickness D of the gap formed between one hard composite material part (R) and the other hard composite material part (R) when bent satisfies the following relational expression.
0.1 × B <D <0.6 × B
More preferably, the following relational expression is satisfied.
0.1 × B <D <0.5 × B
When the thickness D of the void is 0.1 times or less of the width B of the soft composite material part (S), it is insufficient to eliminate the influence of the thickness of the hard composite material part (R) during folding, which is preferable. Absent. In addition, buckling occurs in some or all of the reinforcing fibers of the soft composite material portion (S) due to the 180 ° bending, and the durability against repeated bending deformation is undesirably reduced. In this case, play is likely to occur in the hard composite material part (R) adjacent to the soft composite material part (S), and when a horizontal axial force acts on the hard composite material part (R), the seat due to the axial force is generated. Warping is likely to occur.

  When the soft composite material part (S) exhibits a behavior close to a perfect elastic body, the value of the thickness D of the void increases, but the thickness D of the void is 0% of the width B of the soft composite material part (S). It is difficult to exceed 0.6 times. From the viewpoint of suppressing the occurrence of buckling and eliminating the influence of the thickness and saving the space at the time of folding, the thickness D of the gap is less than 0.5 times the width B of the soft composite material part (S). Preferably, there is.

  The plate material of the present invention is used for a rigid origami structure. One of the problems in realizing a rigid origami structure using a real material for a rigid surface is to eliminate the influence of the thickness of the rigid surface. For this reason, in the present invention, it is preferable that the thickness D of the air gap exceeds twice the thickness T of the hard composite material part (R). When this condition is satisfied, it is possible to obtain a rigid origami structural plate material in which folding inhibition due to the thickness of the rigid surface does not substantially occur.

  The plate material of the present invention that satisfies these conditions preferably has a bendable portion substantially free of the first matrix resin in a plate material of a fiber-reinforced resin composite material composed of reinforcing fibers and a first matrix resin. The plate member of the fiber reinforced resin composite material is divided into a plurality of hard composite material portions (R) by forming a linear composite shape, and the flexible composite material portion (S) is formed by filling the bendable portion with a second matrix resin. ) Can be created.

<Hard composite part (R)>
The hard composite material part (R) is a fiber reinforced resin composite material composed of reinforcing fibers and a first matrix resin.

  As the reinforcing fibers, for example, carbon fibers, basalt fibers, glass fibers, aramid fibers, and polyester fibers can be used. These are preferably continuous fibers, and a woven fabric of continuous fibers is preferably used.

  As the first matrix resin, a thermosetting resin or a thermoplastic resin having a glass transition point of room temperature or higher is used. The thermoplastic resin may be made of a crystalline polymer or an amorphous polymer. The matrix resin may be a mixture of a plurality of resins, and may contain additives such as a stabilizer, a filler, and a flame retardant.

  Examples of the thermosetting resin include an epoxy resin, a phenol resin, a melamine resin, a urea resin, an unsaturated polyester resin, and a thermosetting polyimide. Of these, epoxy resins are preferred.

  Examples of the thermoplastic resin include polyphenylene sulfide, polysulfone, polyether sulfone, polyether ether ketone, thermoplastic polyimide, polyamide imide, amorphous polyarylate, polyamide, polyacetal, polycarbonate, polyester, polyolefin, ABS resin, and acrylic resin. be able to. Among them, polyamide is preferred.

<Soft composite part (S)>
The soft composite material portion (S) is a bendable portion made of the reinforcing fiber and the second matrix resin, and functions as a hinge when bent. The soft composite part (S) is arranged in contact with both the substantially straight edge of one hard composite part (R) and the substantially straight edge of the other hard composite part (R). Have been.

  Here, the substantially linear edge is preferably a linear edge, but the bending of the hard composite material portion (R) adjacent to the soft composite material portion (S) is caused by bending of the soft composite material portion (R). It is meant to include an edge of a shape deformed as much as possible around S).

  The substantially straight edge includes, for example, an edge having irregularities about the width of the soft composite material portion (S). From the viewpoint of reliable folding, the substantially straight line is preferably a straight line without any unevenness.

  Since the second matrix resin plays a role as a hinge, it is preferable that its elastic modulus is 1/10 or less of the elastic modulus of the first matrix resin. This is about the elastic modulus at 25 ° C. If it exceeds 1/10, the stress required for folding deformation of the soft composite material portion becomes excessive, and the operability at the time of folding decreases, which is not preferable. The second matrix resin can be selected from a crosslinkable polymer having a glass transition temperature of room temperature or lower and a thermoplastic elastomer. Examples of the second matrix resin include silicone resin, styrene-based elastomer, olefin-based elastomer, polyurethane-based elastomer, polyester-based elastomer, chlorobrene-based elastomer, acrylonitrile-based elastomer, and natural rubber. In particular, it is preferable to select a silicone resin in consideration of weather resistance. When a crosslinkable polymer is used as the second matrix resin, it can be formed by impregnating the reinforcing fibers of the soft composite material portion in an uncrosslinked or low crosslinked state and then completing the crosslinking reaction.

In the plate material of the present invention, the thickness D of the gap preferably satisfies the relationship of 0.1 × B <D <0.6 × B with the width B of the soft composite material portion (S). In order to obtain a plate material that satisfies this condition, a second matrix resin having an elastic modulus equal to or less than 1/10 of that of the first matrix resin at room temperature is added to the reinforcing fibers of the bendable portion at an impregnation rate of 45 to 95%. It is preferable to form the soft composite material portion (S) by filling in the range. When the impregnation rate is less than 45%, the behavior of the fiber at the time of folding becomes difficult to control, and the weather resistance is insufficient. If the impregnation rate exceeds 95%, the stress required for 180 ° bending may be excessive, and may not function as a hinge in practical use. Here, the impregnation ratio P (%) is defined by the following equation.
P (%) = (((A2-Af) × D1) / ((A1-Af) × D2)) × 100

  However, the areal density of the hard composite material part (R) is A1, the areal density of the soft composite material part (S) is A2, the areal density of the reinforcing fiber is Af, and the first is used for forming the hard composite material part (R). The density of the matrix resin was D1, and the density of the second matrix resin used for forming the soft composite material portion (S) was D2.

<Rigid origami structure>
The present invention is also a rigid origami structure plate material, wherein the bendable portion of the plate material is formed based on a fold line pattern of the rigid origami paper. This rigid origami structure is a origami structure having a fold line pattern that allows the material constituting the origami structure to be expanded and folded without undergoing in-plane elastic deformation.

  Since the rigid origami structure is constructed on a rigid body surface with virtually no thickness, when using a rigid real surface with a thick real material, the thickness of the rigid body surface except for the case where the number of superpositions is zero is zero. Therefore, when the rigid body surfaces are folded, spatial interference occurs between the folded rigid body surfaces around the polygonal line. For this reason, in many cases, folding is only realized incompletely in many cases, and sometimes folding cannot be performed.

  In order to avoid this spatial interference, trial and error are required individually, and there is generally no known method for eliminating the influence of the thickness of the rigid body surface. When making a rigid origami structure, for example using a metal hinge, it is generally necessary to make a number of additional fold lines and cuts, and a rigid origami structure and a foldable foldable structure using it The production of objects becomes extremely complicated.

The rigid origami structure plate material according to the present invention has a line width of the soft composite material portion (S) in all the bendable portions of the bendable line pattern of the rigid origami structure other than those having a superposition number Nc of zero. B and the thickness T of the hard composite material part (R) satisfy the following relational expression, thereby avoiding the influence of the thickness of the rigid body surface and enabling the folding of the actual rigid body surface having the thickness. Can be obtained.
Nc × T <B <100 × Nc × T
Preferably, the following relational expression is satisfied.
(Nc × T) /0.46 <B <100 × Nc × T
More preferably, the following relational expression is satisfied.
(Nc × T) /0.45 <B <100 × Nc × T

  By satisfying this condition, it is possible to obtain the rigid origami structural plate material of the present invention including a bendable portion based on the fold line pattern of the rigid origami without adding an additional fold line. If the line width B is equal to or smaller than Nc × T, the space for accommodating the hard composite material portion (R) overlapping the inside of the polygonal line is not enough, and the folding may not be completely performed. On the other hand, if the line width B is equal to or larger than 100 times Nc × T, the width of the soft composite material (S) becomes too large, and the deviation of the appearance from the intended rigid origami becomes too large. Not preferred.

  As described above, the plate material and the rigid origami structure plate material of the present invention, when bent at an angle of 180 °, have one hard composite material part (R) adjacent to the soft composite material part (S) and the other rigid composite material part (R). A stable gap is formed between the hard composite material part (R) and the other hard composite material part (R) can be smoothly folded in this gap.

  Here, the superimposed number Nc of the polygonal lines of the rigid origami is the total number of rigid surfaces that are partially or entirely sandwiched inside the pair of rigid surfaces when the pair of rigid surfaces connected by the polygonal line are completely folded. Is defined as

  For example, the polygonal line pattern of the rigid origami shown in FIG. 3 has a parallelogram repeating unit, which includes two types of polygonal lines, each having a superimposition degree of 0 and a superimposition degree of 4.

  The rigid origami pattern used in the present invention is preferably a pattern in which the arrangement of polygonal units satisfies the symmetry satisfying the condition of the pattern group. In this case, the appearance is tessellation, and high designability and mechanical structural design are easy. Further, the tessellation structure is preferable because the degree of freedom of deformation can be limited, and the actuation when deforming a foldable structure using the rigid origami structure plate can be simplified. The preferred degree of deformation is one or two.

  The rigid origami structural plate material of the present invention can be reversibly folded using the bendable portion as a folding line. According to the present invention, there is provided a foldable foldable structure made from the above rigid origami structural plate.

<Manufacturing method>
The plate material of the present invention can be manufactured, for example, as follows. The reinforcing fibers are preferably used in the form of a woven fabric. For example, plain weave, twill weave, satin weave, leno weave, mosaic weave, oblique weave, and double weave can be used as the fabric. It may be a one-way UD.
(Method 1)
First, a portion forming the bendable portion of the reinforcing fiber woven fabric is masked and impregnated with a first matrix resin to form a hard composite material portion (R). Next, the flexible matrix part (S) is formed by filling the second matrix resin into the bundle or the woven fabric of the reinforcing fibers in the bendable portion where the masking has been removed.
(Method 2)
First, the flexible matrix portion (S) is formed by filling a portion of the reinforcing fiber fabric forming the bendable portion with the second matrix resin in a flowable state, and then forming the soft matrix portion (S). The other parts are impregnated to form a hard composite material part (R).
(Method 3)
This method can also be used when an inorganic fiber is used as the reinforcing fiber. That is, first, the entire reinforcing fiber is impregnated with the first matrix resin and cured to form the hard composite material portion (R) on the entire surface, and the first matrix resin in the portion forming the bendable portion is selectively formed. It is a method of melting or decomposing to remove and filling it with a second matrix resin. For melting or decomposition, for example, laser or high-temperature heated air can be used.

  In any of the above methods, it is preferable that the impregnation rate of the second matrix resin in the soft composite material part (A) is in the range of 45 to 95%. In order to form the soft composite material portion (B) so as to have this impregnation rate, for example, a method of coating a second matrix resin on a woven fabric of reinforcing fibers and localizing the woven fabric to both surface layers of the reinforcing fibers is employed. Alternatively, a method in which micro or macro voids are included in the matrix resin impregnated layer can be adopted by dissolving the second matrix resin in a solvent and impregnating the fabric of the reinforcing fibers.

  In the present invention, the deformation characteristics of the soft composite material portion (S) with respect to bending are determined by the elastic characteristics of the soft composite material portion (S), the line width B, and the thickness T of the hard composite material portion (R). The elastic properties are mainly determined by the orientation of the reinforcing fibers in the soft composite material part (S) and the impregnation state of the second matrix resin. The impregnation state of the second matrix resin is appropriately adjusted according to the orientation of the reinforcing fibers.

Hereinafter, the present invention will be described using examples. The measurement was performed by the following method.
(1) Impregnation rate of matrix resin The impregnation rate P (%) was calculated by the following equation for the soft composite material portion (S) of the sample.
P (%) = (((A2-Af) × D1) / ((A1-Af) × D2)) × 100
A1: Areal density of hard composite material part (R) A2: Areal density of soft composite material part (S) Af: Areal density of reinforcing fiber D1: First matrix resin used for forming hard composite material part (R) D2: density of the second matrix resin used to form the soft composite material part (S)

(2) Volume Content of Reinforcement Fiber The fiber volume content Vf (%) in the hard composite material part (R) was calculated by the following equation.
Vf (%) = (Af / Df) / (A1 / Dt) × 100
Af: Areal density of reinforcing fiber A1: Areal density of hard composite material part (R) Df: Density of reinforcing fiber used for forming hard composite material part (R) Dt: Density of hard composite material part (R)

(3) Tr / T
As shown in FIG. 3, a measuring device in which an arm (q) is vertically attached to a pedestal (p), and a load detecting end (r) is horizontally installed at a position of height h = 0.04 (m) from the pedestal surface. Was prepared. One hard composite material part (R) of the sample is arranged so that the whole surface is in contact with the pedestal (p), and the soft composite material part (S) (the length in the bending axis direction is A (m)) is 90 °. The other hard composite material part (R) was bent so as to have an angle of, and the surface was arranged so that its surface was in perpendicular contact with the load detection end. Using the load value G (N) detected at this time, Tr / T was calculated by the following equation.
Tr / T = G × h / A

Three pieces of a plain weave carbon fiber woven fabric (manufactured by Teijin Limited: W3101) having a basis weight of 200 g / m ² cut into a rectangle having a long side of 230 mm and a short side of 25 mm are stacked, and the center thereof is parallel to the short side and has a line width of 8 mm. A masking film provided with a slit was placed, and a semi-cured silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd .: sealant 45) diluted 10-fold with hexane was injected and impregnated from both sides of the carbon fiber fabric from above. After the silicone resin is cured and dried to form the soft composite material part (S), the soft composite material part (S) is masked, and a nylon resin powder (trade name: A1015LP-20 manufactured by Unitika Ltd.) is applied to the carbon fiber fabric. It was sprayed on the top, and the nylon resin was impregnated with the carbon fiber fabric by a hot press and cooled to form a rigid composite part (R), thereby obtaining a rigid origami structural plate.

  In the obtained rigid origami structural plate material, a rectangular hard composite material part (R) of 111 mm × 25 mm was formed on both sides of a soft composite material part (S) having a linear length of 25 mm and a line width of 8 mm. It is a shape arranged in contact with the sides. The carbon fiber volume content Vf in the soft composite material part (S) was 40%, and the matrix resin impregnation rate P was 80%. The thickness T of each of the soft composite material portion (S) and the hard composite material portion (R) was 0.75 mm.

  This rigid origami structural plate had a Tr / T of 1050. This rigid origami structure plate material can be bent until both ends of the hard composite material portion (R) come into contact with each other while leaving a gap near the soft composite material portion (S) at the bendable portion. When folded, the thickness D of the gap between one hard composite material part (R) and the other hard composite material part (R) was 3 mm.

A rigid origami structure plate material was obtained in the same manner as in Example 1 except that a plain weave aramid fiber woven fabric (manufactured by Teijin Aramid Co., Ltd .: Twaron Type 2200, plain weave product) having a basis weight of 194 g / m ² was used.

  In the obtained rigid origami structural plate material, a rectangular hard composite material part (R) of 111 mm × 25 mm was formed on both sides of a soft composite material part (S) having a linear length of 25 mm and a line width of 8 mm. It is a shape arranged in contact with the sides. The volume content Vf of aramid fibers in the porous composite material part (S) was 40%, and the impregnation rate P of the matrix resin was 80%. The thickness T of each of the soft composite material portion (S) and the hard composite material portion (R) was 0.75 mm.

  This rigid origami structural plate material had a Tr / T of 570. This rigid origami structure plate material can be bent until both ends of the hard composite material portion (R) come into contact with each other while leaving a gap near the soft composite material portion (S) at the bendable portion. When folded, the thickness D of the gap between one hard composite material part (R) and the other hard composite material part (R) was 3 mm.

  A rigid origami structure plate having a rigid origami structure having the pattern shown in FIG. 3 was prepared. In this rigid origami structure, the length of each side of the parallelogram unit is 100 mm, and the angles formed by the two sides of the parallelogram unit are 60 ° and 120 °. This rigid origami structure is composed of polygonal lines with 0 and 4 superimposed numbers.

  First, the line width of the soft resin material portion (S) corresponding to the broken line having the number of superpositions of 4 is set to 8 mm, and the line width of the soft resin member (S) corresponding to the broken line having the number of superpositions of 0 is set to 3.5 mm. I made a pattern film.

A piece of a plain weave carbon fiber woven fabric (product of Teijin Limited: W3101) having a basis weight of 200 g / m ² cut out to a length of 500 mm and a width of 500 mm is stacked on three sheets, and the above-mentioned masking pattern film is placed thereon. A resin (manufactured by Shin-Etsu Chemical: sealant 45) diluted with hexane was injected and impregnated. After the silicone resin is cured and dried to form the soft composite material part (S), the soft composite material part (S) is masked, and a nylon resin powder (trade name: A1015LP-20 manufactured by Unitika Ltd.) is applied to the carbon fiber fabric. It was sprayed on the top, and the nylon resin was impregnated with the carbon fiber fabric by a hot press and cooled to form a rigid composite part (R), thereby obtaining a rigid origami structural plate.

  The volume fraction Vf of aramid fibers in the soft composite material part (S) of the obtained rigid origami structural board was 40%, and the impregnation rate P of the matrix resin was 80%. The line width B of the soft composite material portion (S) is 8 mm for a line corresponding to the broken line having the number of superpositions of 4, and 3.5 mm for the line corresponding to the broken line having the number of superpositions of 0. The thickness T of each of the composite portions (R) was 0.75 mm.

  Tr / T of the sample cut out from the rigid origami structural plate was 660. In the sample, a rectangular rigid composite material part (R) of 50 mm × 30 mm was arranged on both sides of a soft composite material part (S) having a length of 30 mm and a line width of 3.5 mm, in contact with sides of a length of 30 mm. Shape. FIG. 5 shows the cutout position and shape of the sample.

  This rigid origami structure plate material can be bent until both ends of the hard composite material portion (R) come into contact with each other while leaving a gap near the soft composite material portion (S) at the bendable portion. When folded, the thickness D of the gap between one hard composite material part (R) and the other hard composite material part (R) was 1.8 mm.

  The obtained rigid origami structural plate material was an origami structure, and was a foldable structure capable of being reversibly deformed into a flat plate shape from a completely folded state. When the external force was released in a completely folded state, the rigid origami structural plate material spontaneously expanded to a flat plate shape. This spontaneous deployment did not change with repeated testing.

  The plate material, the rigid origami structure plate material and the foldable structure of the present invention include movable roofs, movable walls, temporary parchments, temporary constructions, sunshades, shelters, acoustic walls, design exterior walls, etc. It can be used for such purposes.

a Flexible composite part (S) which is a bendable part
b Hard composite material part (R)
c Lines with 4 superpositions d Lines with 0 superpositions p Pedestal q Arm r Load detecting end s Sample to be measured B Width of soft composite part (S) D Two adjacent soft composite parts (S) A gap formed between one hard composite material part (R) and the other hard composite material part (R) when the hard composite material part (R) is bent 180 ° about the soft composite material part (S) as an axis. Thickness

Claims (10)

At least two rigid composite parts (R), which are fiber reinforced resin composites composed of reinforcing fibers and a first matrix resin, and a substantially straight edge of one rigid composite part (R) and the other rigid part A substantially linear soft composite part (S) which is disposed in contact with both of the substantially linear edges of the composite part (R) and is a bendable part comprising a reinforcing fiber and a second matrix resin. A plate material composed of
The thickness T (m) of the hard composite material part (R) and two hard composite material parts (R) adjacent to each other with the soft composite material part (S) interposed therebetween are 90 ° about the soft composite material part (S) as an axis. A plate material characterized in that a rotational torque Tr (Nm / m) per unit length of a soft composite material part (S) due to elastic recovery generated when the sheet is bent satisfies the following relational expression.
50 <Tr / T <50000 A fiber-reinforced resin composite material is formed by forming a bendable portion substantially free of the first matrix resin in a substantially straight line on a plate material of a fiber-reinforced resin composite material comprising a reinforcing fiber and a first matrix resin. Is a plate material in which a soft composite material portion (S) is formed by dividing the plate material into a plurality of hard composite material portions (R) and filling a bendable portion with a second matrix resin.
The thickness T (m) of the hard composite material part (R) and two adjacent hard composite material parts (R) sandwiching the soft composite material part (S) are bent 90 ° about the soft composite material part (S) as an axis. A plate material characterized in that a rotational torque Tr (Nm / m) per unit length of the soft composite material portion (S) due to elastic recovery generated when the rotational speed satisfies the following relational expression.
50 <Tr / T <50000 When two adjacent hard composite parts (R) sandwiching the soft composite part (S) are bent at 180 ° about the soft composite part (S) as an axis, one hard composite part (R) and the other hard composite part (R) are bent. The plate material according to claim 1 or 2, wherein the thickness D of the gap formed between the rigid composite material portion (R) and the thickness T of the rigid composite material portion (R) satisfies the following expression.
2 × T <D   The resin impregnation rate of the second matrix resin in the soft composite material part (S) is 45 to 95%, and the second matrix resin has an elastic modulus of 1/10 or less at 25 ° C. of the first matrix resin. The plate material according to claim 1, wherein   The rigid origami structural plate according to claim 4, wherein the bendable portion of the plate is formed based on a fold line pattern of the rigid origami. The line width B of the soft composite material portion (S) and the thickness of the hard composite material portion (R) in all the bendable portions of the bendable line pattern of the rigid origami except those having a superimposed number Nc of zero are formed. The rigid origami structural plate according to claim 5, wherein T satisfies the following relational expression.
Nc × T <B <100 × Nc × T
(Here, the superimposed number Nc of the fold lines of the rigid origami is the number of the rigid surfaces that are partially or wholly sandwiched inside the pair of rigid surfaces when the pair of rigid surfaces connected by the fold line are completely folded. Defined as total.)   The rigid origami structural plate according to claim 5, wherein the rigid origami has one or two degrees of freedom.   A foldable foldable structure made from the rigid origami structural plate according to claim 7.   The two hard composite parts (R) adjacent to each other with the soft composite part (S) interposed therebetween can be bent over 180 ° on both sides about the soft composite part (S) as an axis. A hinge made of the plate material according to 1. When the width B of the soft composite material portion (S) and two hard composite material portions (R) adjacent to each other with the soft composite material portion (S) interposed therebetween are bent 180 ° about the soft composite material portion (S) as an axis. The plate material according to claim 1, wherein a thickness D of a gap formed between the one hard composite material part (R) and the other hard composite material part (R) satisfies the following relational expression.
0.1 × B <D <0.6 × B

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