Composite material structure node based on fiber reinforced 3D printing material

Abstract

The invention discloses a composite material structure node based on a fiber-reinforced 3D printing material. The composite material structure node comprises a reinforced 3D printing connecting piece and a fiber-reinforced composite material pultrusion profile component, the reinforced 3D printing connecting piece is a fiber reinforced composite material piece and comprises a 3D printing material part and a reinforced material product embedded in the 3D printing material part, and the mechanical property of a fiber reinforced composite material of the reinforced material product is higher than that of a fiber reinforced composite material of the 3D printing material part; and the fiber reinforced composite material pultrusion profile component is connected with the reinforced 3D printing connecting piece. The connecting structure has the characteristics of light weight, high strength, free shape, convenience in manufacturing and the like, and a high-performance full-composite connecting structure is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of civil engineering, and in particular relates to a composite material structural node based on fiber-reinforced 3D printing material. Background Art

[0002] In recent years, with the continuous development of 3D printing technology, this unique additive manufacturing technology has received widespread attention and development. 3D printing technology, also known as additive manufacturing technology, is different from traditional subtractive manufacturing technology. It is a new technology that manufactures three-dimensional objects by adding materials layer by layer. Higher mechanical properties are one of the goals of 3D printing materials. In order to achieve this goal, short fiber reinforced 3D printing technology and continuous fiber reinforced 3D printing technology have emerged. At present, according to existing literature reports, the axial tensile performance of 3D printing materials can reach up to 900MPa. It is a continuous carbon fiber reinforced 3D printing material with a fiber volume content of about 60%. However, compared with other fiber reinforced composite materials (FiberReinforced Polymer, referred to as FRP), this mechanical property is obviously insufficient. Based on national standards, the axial tensile performance of carbon fiber pultruded plates for wind turbine blades, which have been used in large quantities, can reach 1700MPa, and the axial tensile performance of carbon fiber cables used in a large number of engineering projects can reach 2100MPa or even 3000MPa. However, it is difficult for pultruded plates and cables to achieve the diverse shapes, convenient and fast production of 3D printing technology. This is determined by the different production processes of the two materials.

[0003] 3D printing technology is one of the technologies that is expected to solve the problem of FRP pultruded profile connection. FRP pultruded profile connection nodes have problems such as interlaced geometric structures, complex stress states, and limited connection performance. Existing technical solutions generally use metal connectors or bolts to connect FRP pultruded profile components, which have problems such as low strength utilization, excessive node area, and cumbersome construction. This is mainly because this method generally requires separate processing of metal connectors and uses more connectors to ensure performance, resulting in low strength utilization and excessive node area. 3D printing technology can optimize the fiber structure of connectors according to the stress mode, arrange fibers in combination with the stress characteristics of the node area, and produce components of various shapes without molds, avoiding damage to components caused by excessive processing. It can provide a new technical solution for the connection of FRP pultruded profiles. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a composite material structural node based on fiber-reinforced 3D printing material, which has the characteristics of light weight, high strength, free shape and convenient manufacturing, so as to realize a high-performance all-composite connection structure.

[0005] A composite material structural node based on a fiber-reinforced 3D printing material according to an embodiment of the present invention includes:

[0006] A reinforced 3D printed connector, wherein the reinforced 3D printed connector is a fiber reinforced composite material part, comprising a 3D printed material portion and a reinforced material product embedded in the 3D printed material portion, wherein the mechanical properties of the fiber reinforced composite material of the reinforced material product are higher than the mechanical properties of the fiber reinforced composite material of the 3D printed material portion;

[0007] A fiber-reinforced composite pultruded profile component, wherein the fiber-reinforced composite pultruded profile component is connected to the reinforced 3D printed connector.

[0008] According to the composite material structural node based on fiber reinforced 3D printed materials of the present invention, a full-composite node of a fiber reinforced composite material pultruded profile structure is realized by connecting it with a fiber reinforced composite material pultruded profile component using a reinforced 3D printed connector, wherein the reinforced 3D printed connector is reinforced by using a reinforcing material product with higher performance to reinforce the 3D printed material part, which can well improve the overall force performance of the reinforced 3D printed connector. At the same time, the bearing capacity of the 3D printed material part decreases rapidly after cracking, and the addition of the reinforcing material product ensures that the reinforced 3D printed connector still has a good bearing capacity after cracking. At this time, the reinforcing material product mainly bears the load, thereby realizing the excellent mechanical properties of the composite material structural node based on fiber reinforced 3D printed materials of the present invention, and the composite material structural node based on fiber reinforced 3D printed materials of the present invention has the advantages of light weight, simple operation, and convenient production, and can be well applied to the nodes of FRP pultruded profile structures, and has broad engineering application prospects.

[0009] In some embodiments, the reinforced material product includes, but is not limited to, a high performance fiber reinforced composite material product.

[0010] In some embodiments, the reinforced material product includes, but is not limited to, a plate or a rod.

[0011] In some embodiments, the fiber-reinforced composite material of the 3D printing material portion includes, but is not limited to, short fiber-reinforced composite materials and continuous fiber-reinforced composite materials.

[0012] In some embodiments, the reinforced 3D printed connector is made by the following process: the reinforced material product is inserted into the process of printing the 3D printed material portion and printed as one piece; or the 3D printed material portion with reserved holes is first printed by 3D printing technology, and then the reinforced material product portion is embedded in the reserved holes of the 3D printed material portion, and the reinforced material product and the 3D printed material portion are connected by adhesive.

[0013] In some embodiments, the adhesive connection between the reinforced material product and the 3D printing material portion is specifically a structural adhesive connection.

[0014] In some embodiments, the reinforced 3D printed connector is adaptively mounted on the fiber reinforced composite pultruded profile component.

[0015] In some embodiments, the connection between the fiber-reinforced composite pultruded profile component and the reinforced 3D-printed connector includes, but is not limited to, a bolt connection, an adhesive connection, and a hybrid connection of adhesive and bolts.

[0016] In some embodiments, the bolt is a metal bolt or a composite bolt.

[0017] In some embodiments, the fiber direction of the reinforced 3D printed connector is consistent with the principal stress state of the composite material structure node based on the fiber-reinforced 3D printed material.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a schematic diagram of the technical principle of the enhanced 3D printed connector of the present invention;

[0021] Figure 2 is a schematic diagram of an enhanced 3D printed connector of the present invention;

[0022] Figure 3 A schematic diagram of a composite material structure node based on fiber-reinforced 3D printing material according to the present invention;

[0023] Figure 4 A schematic diagram of another enhanced 3D printed connector of the present invention;

[0024] Figure 5 This is a schematic diagram of another composite material structural node based on fiber-reinforced 3D printing material according to the present invention.

[0025] Reference numerals:

[0026] Reinforced 3D printed connector 1; reinforced material product 101; 3D printed material portion 102; fiber reinforced composite pultruded profile component 2. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Combine the following Figures 1 to 5 The composite material structural node based on the fiber-reinforced 3D printing material according to the embodiment of the present invention is described.

[0029] like Figures 1 to 5 As shown, an embodiment of the present invention proposes a composite material structural node based on fiber-reinforced 3D printed materials, using a reinforced 3D printed connector 1 to connect fiber-reinforced composite pultruded profile components 2 to achieve the goal of high-performance nodes, achieve the technical goal of all-composite connections, meet the needs of engineering development, and achieve high-performance all-composite structures.

[0030] A composite material structural node based on fiber-reinforced 3D printed materials according to an embodiment of the present invention includes a reinforced 3D printed connector 1 and a fiber-reinforced composite material pultruded profile component 2.

[0031] Specifically, the reinforced 3D printed connector 1 is a fiber-reinforced composite material, including a 3D printed material portion 102 and a reinforced material product 101 embedded in the 3D printed material portion 102; that is, the 3D printed material portion 102 and the reinforced material product 101 are both made of fiber-reinforced composite materials, so that the reinforced 3D printed connector 1 has the characteristics of light weight and excellent strength. The mechanical properties of the fiber-reinforced composite material of the reinforced material product 101 are higher than the mechanical properties of the fiber-reinforced composite material of the 3D printed material portion 102. For example, the reinforced material product 101 is a high-performance fiber-reinforced composite material plate or rod, and the fiber-reinforced composite material of the 3D printed material portion 102 is a conventional common short fiber-reinforced composite material or a continuous fiber-reinforced composite material. Figure 1 The technical principle of the enhanced 3D printed connector 1 is shown in FIG. 1 , wherein the 3D printed material portion 102 can be made of a common fiber-reinforced composite material such as a short fiber-reinforced composite material or a continuous fiber-reinforced composite material using 3D printing technology, and any desired shape of the 3D printed material portion 102 (i.e., the shape of the enhanced 3D printed connector 1, see FIG. 1 ) can be printed. Figure 2 and Figure 4), the specific structure and size of the 3D printing material part 102 are determined by the design of the fiber reinforced composite pultruded profile component 2, and are matched with the reinforced material product 101; and the reinforced material product 101 is a pre-made fiber reinforced composite product, and the specific size and performance of the reinforced material product 101 are determined by the design of the fiber reinforced composite pultruded profile component 2, and are matched with the 3D printing material part 102; since the 3D printing material part 102 is directly printed using traditional fiber reinforced composite materials, the mechanical properties of the 3D printing material part 102 are limited, therefore, the overall mechanical properties of the enhanced 3D printing connector 1 are improved by embedding and fixing the higher performance reinforced material product 101 in the 3D printing material part 102, so that the overall mechanical properties of the enhanced 3D printing connector 1 are better than those of the common fiber reinforced composite 3D printed connectors, thereby achieving higher mechanical properties and giving full play to the characteristics of 3D printing technology that is quick to manufacture and does not require molds. The specific structure and size of the enhanced 3D printing connector 1 are determined by actual needs, and are used for connecting pultruded profile structures, transferring and bearing loads. Therefore, the enhanced 3D printed connector 1 has the advantages of light weight, high strength, free shape and convenient manufacturing.

[0032] like Figure 2 and Figure 3 As shown, the fiber reinforced composite pultruded profile component 2 is connected to the enhanced 3D printed connector 1. Among them, the fiber reinforced composite pultruded profile component 2 (referred to as FRP pultruded profile component) can be made of glass fiber, carbon fiber and other fibers and corresponding resins through pultrusion molding process. It is a common composite product. Its cross-sectional form, length and performance can be selected according to structural requirements and corresponding product standards. It has high mechanical properties and significant anisotropy and can be widely used in engineering structures. The nodes of the fiber reinforced composite pultruded profile component 2 with staggered geometric structures and complex stress states are connected using the designed enhanced 3D printed connector 1, which can make the fiber direction of the enhanced 3D printed connector 1 consistent with the principal stress state, ensure that the fiber plays a full role, avoid the fiber reinforced composite pultruded profile component 2 and the enhanced 3D printed connector 1 from having a low bearing capacity failure mode, and thus improve the overall mechanical properties.

[0033] According to the composite material structural node based on fiber reinforced 3D printing material of the present invention, a full composite material node of a fiber reinforced composite material pultruded profile structure is realized by connecting the reinforced 3D printing connector 1 with the fiber reinforced composite material pultruded profile component 2, wherein the reinforced 3D printing connector 1 is reinforced by using a higher performance reinforcement material product 101 to reinforce the 3D printing material part 102, which can well improve the overall force performance of the reinforced 3D printing connector 1, and at the same time, the bearing capacity of the 3D printing material part 102 decreases rapidly after cracking, and the addition of the reinforcement material product 101 ensures that the reinforced 3D printing connector 1 still has a good bearing capacity after cracking. At this time, the reinforcement material product 101 mainly bears the load, thereby realizing the excellent mechanical properties of the composite material structural node based on fiber reinforced 3D printing material of the present invention, and the composite material structural node based on fiber reinforced 3D printing material of the present invention has the advantages of light weight, simple operation, convenient production, etc., can be well applied to the nodes of FRP pultruded profile structure, and has broad engineering application prospects. Figure 2 The reinforced 3D printed connector 1 of the truss node mainly bears axial load. Figure 3 The reinforced 3D printed connector 1 of the beam-column node mainly bears bending load, which are two specific application scenarios of the composite material structure node based on fiber-reinforced 3D printed material in the embodiment of the present invention.

[0034] In some embodiments, the reinforced material product 101 includes but is not limited to a high-performance fiber-reinforced composite material product, which can be selected according to actual needs.

[0035] In some embodiments, the reinforced material product 101 includes but is not limited to plates and rods, which can be selected according to actual needs.

[0036] In some embodiments, the fiber-reinforced composite material of the 3D printing material unit 102 includes, but is not limited to, short fiber-reinforced composite materials and continuous fiber-reinforced composite materials, which can be selected according to actual needs.

[0037] In some embodiments, the enhanced 3D printed connector 1 is made by the following process: inserting the reinforced material product 101 during the printing of the 3D printed material portion 102, so that the 3D printed material portion 102 and the reinforced material product 101 are printed and formed in one piece; or firstly printing the 3D printed material portion 102 with a reserved hole by 3D printing technology, and then embedding the reinforced material product 101 into the reserved hole of the 3D printed material portion 102, and the reinforced material product 101 and the 3D printed material portion 102 are connected by adhesive. Therefore, the enhanced 3D printed connector 1 has the advantages of light weight, high strength, free shape and convenient manufacturing.

[0038] In some embodiments, the adhesive connection between the reinforced material product 101 and the 3D printing material portion 102 is specifically a structural adhesive connection, and the connection is firm.

[0039] In some embodiments, the enhanced 3D printed connector 1 is adaptively sleeved on the fiber reinforced composite pultruded profile component 2. Thus, the enhanced 3D printed connector 1 is conveniently connected to the fiber reinforced composite pultruded profile component 2.

[0040] In some embodiments, the connection between the fiber-reinforced composite pultruded profile component 2 and the reinforced 3D printed connector 1 includes but is not limited to bolt connection, adhesive connection, and a mixed connection of adhesive and bolts, thereby ensuring the reliability of the composite structural node based on the fiber-reinforced 3D printed material of this embodiment.

[0041] In some embodiments, the bolts are metal bolts or composite material bolts, but are not limited thereto and can be selected according to actual needs.

[0042] In some embodiments, the fiber direction of the reinforced 3D printed connector 1 is consistent with the principal stress state of the composite structure node based on the fiber-reinforced 3D printed material. In this way, the fibers can be fully utilized to avoid the low-bearing capacity failure mode of the fiber-reinforced composite pultruded profile component 2 and the reinforced 3D printed connector 1, thereby improving the overall mechanical properties.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A composite material structural node based on fiber-reinforced 3D printing material, characterized in that: include: A reinforced 3D printed connector, wherein the reinforced 3D printed connector is a fiber reinforced composite material part, comprising a 3D printed material portion and a reinforced material product embedded in the 3D printed material portion, wherein the mechanical properties of the fiber reinforced composite material of the reinforced material product are higher than the mechanical properties of the fiber reinforced composite material of the 3D printed material portion; A fiber-reinforced composite pultruded profile component, wherein the fiber-reinforced composite pultruded profile component is connected to the reinforced 3D printed connector.

2. The composite structural node based on fiber-reinforced 3D printing material according to claim 1, characterized in that: The reinforced material products include but are not limited to high-performance fiber-reinforced composite materials products.

3. The composite structural node based on fiber-reinforced 3D printing material according to claim 2, characterized in that: The reinforced material products include but are not limited to plates or rods.

4. The composite structural node based on fiber-reinforced 3D printing material according to claim 1, characterized in that: The fiber-reinforced composite material of the 3D printing material unit includes but is not limited to short fiber-reinforced composite materials and continuous fiber-reinforced composite materials.

5. The composite structural node based on fiber-reinforced 3D printing material according to claim 4, characterized in that: The reinforced 3D printed connector is manufactured by the following process: the reinforced material product is inserted into the process of printing the 3D printed material portion and printed as one piece; or the 3D printed material portion with reserved holes is first printed by 3D printing technology, and then the reinforced material product portion is embedded in the reserved holes of the 3D printed material portion, and the reinforced material product and the 3D printed material portion are connected by adhesive.

6. The composite structural node based on fiber-reinforced 3D printing material according to claim 5, characterized in that: The adhesive connection between the reinforced material product and the 3D printing material portion is specifically a structural adhesive connection.

7. The composite structural node based on fiber-reinforced 3D printing material according to any one of claims 1 to 6, characterized in that: The enhanced 3D printed connector is adaptively sleeved on the fiber reinforced composite pultruded profile component.

8. The composite structural node based on fiber-reinforced 3D printing material according to any one of claims 1 to 6, characterized in that: The connection between the fiber reinforced composite pultruded profile component and the reinforced 3D printed connector includes but is not limited to bolt connection, adhesive connection, and a hybrid connection of adhesive and bolts.

9. The composite structural node based on fiber-reinforced 3D printing material according to claim 8, characterized in that: The bolts are metal bolts or composite material bolts.

10. The composite structural node based on fiber-reinforced 3D printing material according to claim 1, characterized in that: The fiber direction of the reinforced 3D printed connector is consistent with the principal stress state of the composite material structure node based on the fiber reinforced 3D printed material.

Images