A composite board

Abstract

The present application relates to the technical field of building materials, and in particular to a composite board. The present application provides a composite board, comprising: a first FRP flat plate and a second FRP curved plate; the second FRP curved plate comprises a plurality of convex strips, each of the convex strips is arranged in parallel with each other, and a groove is provided between adjacent convex strips, with the convex part facing the convex strip being the front side of the second FRP curved plate, and the concave part facing the groove being the reverse side of the second FRP curved plate, wherein the materials of the first FRP flat plate and the second FRP curved plate are different; with the first FRP flat plate as the axis of symmetry, the reverse sides of the two second FRP curved plates are symmetrically arranged on the two sides of the first FRP flat plate. The present application provides a composite board, which can effectively combine the technical defects of traditional FRP materials that cannot simultaneously possess excellent tensile fracture strain performance and high elastic modulus.

Description

Technical Field

[0001] The present application relates to the technical field of building materials, and in particular to a composite board. Background Art

[0002] With the continuous development of domestic infrastructure construction, my country's infrastructure construction has made rapid progress, and the demand for reinforced concrete is increasing. Due to long-term mining, river sand resources for engineering are becoming increasingly scarce. Therefore, people focus on the abundant sea sand. However, sea sand contains more chloride ions that can corrode steel bars, so steel cannot be directly used in seawater sea sand concrete structures.

[0003] Existing fiber reinforced composite materials (referred to as "composite materials", English Fiber Reinforced Polymer, English abbreviation "FRP") are widely used due to their good corrosion resistance, strong fatigue resistance, and convenient construction. Traditional FRP includes CFRP, GFRP, and AFRP. These FRPs are widely used, have high strength and elastic modulus, and tensile fracture strain is less than 3%.

[0004] The new FRP materials that have appeared in recent years are made of polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), and the tensile fracture strain reaches more than 5%, which makes it have greater energy dissipation capacity, but its strength and elastic modulus are lower than those of traditional FRP. Under the same strain and the same bearing capacity as traditional FRP, PET FRP requires a material with a larger cross-sectional area. It can be seen that it is difficult for existing FRP materials to have excellent tensile fracture strain performance and elastic modulus performance at the same time.

[0005] Reasonable combination can obtain a hybrid FRP material with high strength, elastic modulus and large deformation capacity, which can give it a broader application prospect. Summary of the invention

[0006] In view of this, the present application provides a composite plate material that can effectively solve the technical defects of traditional FRP materials that cannot simultaneously possess excellent tensile fracture strain performance and high elastic modulus.

[0007] The present application provides a composite plate material, which is suitable for use in marine environments and special environments such as medical magnetic resonance imaging and radar facilities, and can be used as a tensile load-bearing component on the other hand.

[0008] The present application provides a composite plate, comprising: a first FRP flat plate and a second FRP curved plate;

[0009] The second FRP curved plate comprises a plurality of convex strips, each of which is arranged parallel to each other, and a groove is provided between adjacent convex strips, the convex part of the convex strip is the front side of the second FRP curved plate, and the concave part of the groove is the back side of the second FRP curved plate, wherein the materials of the first FRP flat plate and the second FRP curved plate are different;

[0010] With the first FRP flat plate as a symmetry axis, the reverse sides of the two second FRP curved plates are symmetrically arranged on two sides of the first FRP flat plate.

[0011] Preferably, the cross-sectional area of ​​the convex strip and the first FRP flat plate along the radial direction of the convex strip is arc-shaped or rectangular.

[0012] Preferably, the material of the first FRP flat plate is selected from PET FRP (Polyethylene terephthalate, PET for short, fiber-reinfirced polymer, FRP for short, polyethylene terephthalate fiber reinforced composite material), PEN FRP (Polythylene naphthalate, PEN for short, fiber-reinfirced polymer, FRP for short, polyethylene naphthalate fiber reinforced composite material), carbon fiber reinforced composite material, aramid fiber reinforced composite material or basalt fiber reinforced composite material; preferably, the material of the first FRP flat plate is selected from PET FRP or PEN FRP.

[0013] Preferably, the material of the second FRP curved plate is selected from carbon fiber reinforced composite materials, aramid fiber reinforced composite materials or basalt fiber reinforced composite materials.

[0014] Preferably, the length of the first FRP flat plate is less than or equal to the length of the second FRP curved plate.

[0015] Specifically, the length of the first flat plate is less than or equal to the length of the second FRP curved plate after extension.

[0016] Preferably, the convex strips and the first FRP flat plate form preset pores, and the size of the preset pores can be controlled by controlling the number and protrusion height of the convex strips. The preset pores are used to accommodate the tensile deformation of the second FRP curved plate.

[0017] Preferably, the reverse sides of the two second FRP curved plates are symmetrically bonded to the two sides of the first FRP flat plate.

[0018] Preferably, the composite plate further comprises a third FRP curved plate, wherein the third FRP curved plate comprises a plurality of convex strips, each of the convex strips is arranged parallel to each other, and a groove is arranged between adjacent convex strips, so that the convex part of the convex strip is the front side of the third FRP curved plate, and the concave part of the groove is the reverse side of the third FRP curved plate;

[0019] With the first FRP flat plate as a symmetry axis, the reverse surfaces of the two third FRP curved plates are symmetrically arranged on the front surface of the second FRP curved plate.

[0020] Wherein, the material of the third FRP curved plate is selected from carbon fiber reinforced composite material, aramid fiber reinforced composite material or basalt fiber reinforced composite material.

[0021] The shape of the third FRP curved plate may be the same as that of the second FRP curved plate, or the shape of the third FRP curved plate may be different from that of the second FRP curved plate.

[0022] Preferably, the reverse surfaces of the two third FRP curved plates are symmetrically bonded to the front surfaces of the second FRP curved plates.

[0023] Specifically, the grooves of the third FRP curved plate are aligned with the convex strips of the second FRP curved plate.

[0024] It should be noted that the preparation process of the second FRP curved plate of the composite plate provided in the present application is to bend the material of the second FRP curved plate to form an integrally formed curved plate formed by a plurality of convex strips parallel to each other.

[0025] It should be noted that the present application can obtain a composite plate with different tensile fracture strain and elastic modulus by controlling the number of ridges or the protrusion height of the second FRP curved plate, or controlling the material of the first FRP flat plate or the second FRP curved plate.

[0026] It should be noted that the first FRP flat plate and the second FRP curved plate of the composite plate provided in the present application can both bear loads along the FRP fiber direction of the composite plate of the present application, that is, along the direction of straightening (extending) the convex strips of the second FRP curved plate (that is, along the radial direction of the convex strips).

[0027] It should be noted that the composite plate provided in the present application can also be provided with a third FRP curved plate to obtain a composite plate with different tensile fracture strains and elastic moduli.

[0028] It can be seen from the above technical solutions that this application has the following advantages:

[0029] The present application provides a composite plate, which can effectively combine the characteristics of a first FRP flat plate and a second FRP curved plate. The first FRP flat plate is a flat plate structure, and the second FRP curved plate is a curved plate structure, so that the composite plate of the present application is used as a tension member. Before use, the convex strip of the second FRP curved plate of the composite plate forms a preset gap with the first FRP flat plate, so that the second FRP curved plate can be freely extended and retracted. The present application can adjust the stress of the first FRP flat plate and the second FRP curved plate by adjusting the length of the second FRP curved plate before use (i.e. before tension). In the early stage of stretching, the first FRP flat plate of the composite plate of the present application bears the load alone; in the late stage of stretching, the second FRP curved plate generates tensile stress when the composite plate of the present application is stretched to the preset strain. The overall length of the composite plate of the present application after stretching is greater than or equal to the length of the second FRP curved plate before stretching, and the first FRP flat plate and the second FRP curved plate bear the load together. At this time, the elastic modulus of the composite plate of the present application changes, and the elastic modulus of the first FRP flat plate < the elastic modulus of the composite plate of the present application < the elastic modulus of the second FRP curved plate. Therefore, when the length of the composite plate of the present application remains unchanged, the secant modulus of the composite plate of the present application can be changed by adjusting the stretchable length of the second FRP curved plate.

[0030] In summary, the composite plate provided by the present application can freely adjust the secant modulus of the FRP composite plate according to the structural characteristics to meet the purpose of structural use. The composite plate provided by the present application is lightweight and high-strength, which reduces the difficulty of installation on the construction site, reduces the impact of manpower and construction on normal use, and can be used in seawater and sea sand concrete structures without considering the corrosion of chloride ions on the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of a first composite board provided in an embodiment of the present application;

[0032] Figure 2 for Figure 1 AA cross-section diagram;

[0033] Figure 3 for Figure 1 BB cross-section diagram;

[0034] Figure 4 A schematic diagram of a second composite board provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of a third composite board provided in an embodiment of the present application;

[0036] Figure 6 for Figure 5 AA cross-section diagram;

[0037] Figure 7 for Figure 5 BB cross-section diagram;

[0038] Figure 8 The tensile stress-strain curve of the composite plate provided in the embodiment of the present application, wherein: Figure 8 The tensile stress-strain curve in FIG. 1 is two broken lines. The first section marked as “only the straight FRP is under tension” is the tensile stress-strain curve of the first FRP flat plate 1, and the second section marked as “straight and curved FRP are under tension together” is the tensile stress-strain curve of the first FRP flat plate 1 and the two second FRP curved plates 2. DETAILED DESCRIPTION

[0039] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0040] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0042] It should be understood that this application is applied to the field of building materials, please refer to Figure 1-3 , Figure 1 A schematic diagram of a first composite board provided in an embodiment of the present application; Figure 2 for Figure 1 AA cross-section diagram; Figure 3 for Figure 1 BB cross-section diagram; Figure 1-3 As shown, Figure 1 The invention comprises a first FRP flat plate 1 and a second FRP curved plate 2; the second FRP curved plate 2 comprises a plurality of convex strips 2-1, each convex strip 2-1 is arranged in parallel with each other, and a groove 2-2 is arranged between adjacent convex strips 2-1, the convex part of the convex strip is the front side C of the second FRP curved plate, and the concave part of the groove is the reverse side D of the second FRP curved plate, wherein the materials of the first FRP flat plate 1 and the second FRP curved plate 2 are different; with the first FRP flat plate 1 as the axis of symmetry, the reverse sides of the two second FRP curved plates 2 are symmetrically arranged on the two sides of the first FRP flat plate 1.

[0043] Specifically, Figure 2 for Figure 1 The AA cross-sectional view is a cross-sectional view of the highest point of the convex strip 2-1; Figure 3 for Figure 1 The BB cross-sectional view is a cross-sectional view of the lowest point of the convex strip 2 - 1 .

[0044] The first FRP flat plate 1 of the embodiment of the present application is a flat plate structure, and the second FRP curved plate 2 is a curved plate structure, so that the composite plate of the present application is a tension member. Before use, the convex strip 2-1 of the second FRP curved plate of the composite plate forms a preset gap with the first FRP flat plate 1, so that the second FRP curved plate 2 can be freely expanded and contracted. The present application can adjust the length of the second FRP curved plate 2 before use (i.e. before tension), thereby adjusting the stress conditions of the first FRP flat plate 1 and the second FRP curved plate 2.

[0045] During the tension process of the composite plate of the present application, the second FRP curved plate 2 and the first FRP flat plate 1 form a preset gap. After the load is applied to the composite plate of the present application, the second FRP curved plate 2 can freely expand and contract before being straightened, and the secant modulus of the composite plate of the present application can be adjusted. Figure 8 , Figure 8The tensile stress-strain curve of the composite plate provided by the present application shows that the first FRP flat plate 1 of the composite plate of the present application bears the load first. As the strain of the composite plate of the present application increases, the pre-stretching length of the second FRP curved plate 2 can be adjusted to start bearing force when the composite plate of the present application reaches 1% strain, or when the composite plate of the present application reaches 2%. Therefore, in the early stage of stretching, the first FRP flat plate of the composite plate of the present application bears the load alone; in the late stage of stretching, the second FRP curved plate generates tensile stress when the composite plate of the present application is stretched to the preset strain, the post-stretching length of the composite plate of the present application is greater than or equal to the pre-stretching length of the second FRP curved plate, and the first FRP flat plate and the second FRP curved plate bear the load together. At this time, the elastic modulus of the composite plate of the present application changes, and the elastic modulus of the first FRP flat plate < the elastic modulus of the composite plate of the present application < the elastic modulus of the second FRP curved plate. Therefore, when the length of the composite plate of the present application remains unchanged, the secant modulus of the composite plate of the present application can be changed by adjusting the stretchable length of the second FRP curved plate. The composite plate provided by the present application can freely adjust the secant modulus of the FRP composite plate according to the structural characteristics to meet the purpose of structural use. In addition, the composite plate provided by the present application is light and high-strength, which is conducive to reducing the cross-sectional size of the component and can improve the seismic resistance of the structure. Moreover, the composite plate of the present application has a corrosion-resistant effect and can be used in the seawater and sea sand concrete structure of the island, so that the seawater and sea sand concrete structure has a higher bearing capacity and good ductility.

[0046] Furthermore, the second FRP curved plate 2 is an integrally formed curved plate with a plurality of convex strips 2-1 arranged in parallel and in contact with each other; the second FRP curved plate 2 may also be an integrally formed curved plate with a plurality of convex strips 2-1 arranged in parallel and at a preset distance.

[0047] For further information, see Figure 4 , Figure 4 This is a schematic diagram of the second composite board provided in the embodiment of the present application. Figure 4 As shown, the cross-sectional area of ​​the convex strip 2-1 and the first FRP plate 1 along the radial direction of the convex strip can be arc-shaped or rectangular.

[0048] Further, the length of the first FRP flat plate is less than or equal to the length of the second FRP curved plate. Specifically, the length of the first FRP flat plate before stretching is less than or equal to the length of the second FRP curved plate before stretching.

[0049] Further, the material of the first FRP plate 1 is selected from PET FRP, PEN FRP, carbon fiber reinforced composite material, aramid fiber reinforced composite material or basalt fiber reinforced composite material. Preferably, the material of the first FRP plate 1 is selected from PET FRP or PEN FRP with large fracture strain.

[0050] Furthermore, the material of the second FRP curved plate 2 is selected from carbon fiber reinforced composite material, aramid fiber reinforced composite material or basalt fiber reinforced composite material.

[0051] Furthermore, the convex strip 2 - 1 and the first FRP plate 1 form a preset gap.

[0052] Furthermore, the reverse surfaces D of the two second FRP curved plates are symmetrically bonded to the two surfaces of the first FRP flat plate 1 .

[0053] It should be noted that the ridges 2-1 of the present application are arranged in parallel to form a second FRP curved plate, and the force direction of the ridges 2-1 is along the radial direction of the ridges 2-1, not along the axial direction of the ridges 2-1.

[0054] The present application also provides another composite plate structure. Figure 5-7 , Figure 5 A schematic diagram of a third composite board provided in an embodiment of the present application; Figure 6 for Figure 5 AA cross-section diagram; Figure 7 for Figure 5 BB cross-sectional view, the embodiment of the present application also includes a third FRP curved plate 3, the third FRP curved plate 3 includes a plurality of convex strips 3-1, each convex strip 3-1 is arranged in parallel with each other, and a groove 3-2 is arranged between adjacent convex strips 3-1, with the convex part direction facing the convex strip 3-1 being the front side of the third FRP curved plate, and the concave part direction facing the groove 3-2 being the back side of the third FRP curved plate; with the first FRP flat plate 1 as the axis of symmetry, the back sides of the two third FRP curved plates are symmetrically arranged on the surface of the front side C of the second FRP curved plate.

[0055] The structure of the third FRP curved plate 3 is similar to that of the second FRP curved plate.

[0056] Furthermore, the reverse surfaces of the two third FRP curved plates 3 are symmetrically bonded to the surface of the front surface C of the second FRP curved plate.

[0057] For further information, see Figures 5 to 7 The convex strip 3-1 of the third FRP curved plate is staggered with the convex strip 2-1 of the second FRP curved plate; the concave groove 3-2 of the third FRP curved plate is aligned with the convex position of the convex strip of the second FRP curved plate.

[0058] Therefore, the secant modulus of the composite plate provided in the present application can be controlled by adjusting different FRP types, increasing the number of layers of the third FRP curved plate, and controlling the pre-stretching length of the third FRP curved plate.

[0059] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0060] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0061] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A composite sheet, characterized in that: include: a first FRP flat plate, a second FRP curved plate, and a third FRP curved plate; The second FRP curved plate comprises a plurality of convex strips, each of which is arranged parallel to each other, and a groove is provided between adjacent convex strips, the convex part of the convex strip is the front side of the second FRP curved plate, and the concave part of the groove is the back side of the second FRP curved plate, wherein the materials of the first FRP flat plate and the second FRP curved plate are different; Taking the first FRP flat plate as the axis of symmetry, the reverse sides of the two second FRP curved plates are symmetrically arranged on two sides of the first FRP flat plate; The force direction of the convex strip is along the radial direction of the convex strip; The convex strip and the first FRP flat plate form a preset gap, which is used to adjust the stress conditions of the first FRP flat plate and the second FRP curved plate by adjusting the length of the second FRP curved plate before being pulled; The third FRP curved plate includes a plurality of convex strips, each of which is arranged parallel to each other, and a groove is arranged between adjacent convex strips, so that the convex part of the convex strip is the front side of the third FRP curved plate, and the concave part of the groove is the back side of the third FRP curved plate; Taking the first FRP flat plate as the axis of symmetry, the reverse surfaces of the two third FRP curved plates are symmetrically arranged on the front surface of the second FRP curved plate; The convex strips of the third FRP curved plate are staggered with the convex strips of the second FRP curved plate; The groove of the third FRP curved plate is aligned with the convex position of the convex strip of the second FRP curved plate.

2. The composite sheet material according to claim 1, characterized in that: The cross-sectional area of ​​the convex strip and the first FRP flat plate along the radial direction of the convex strip is arc-shaped or rectangular.

3. The composite sheet material according to claim 1, characterized in that: The material of the first FRP plate is selected from PETFRP, PEN FRP, carbon fiber reinforced composite material, aramid fiber reinforced composite material or basalt fiber reinforced composite material.

4. The composite sheet material according to claim 1, characterized in that: The material of the second FRP curved plate is selected from carbon fiber reinforced composite material, aramid fiber reinforced composite material or basalt fiber reinforced composite material.

5. The composite sheet material according to claim 1, characterized in that: The length of the first FRP flat plate is less than or equal to the length of the second FRP curved plate.

6. The composite sheet material according to claim 1, characterized in that: The reverse sides of the two second FRP curved plates are symmetrically arranged on two sides of the first FRP flat plate.

7. The composite sheet material according to claim 1, characterized in that: The reverse surfaces of the two third FRP curved plates are symmetrically bonded to the front surface of the second FRP curved plate.

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