Special-shaped composite material connecting assembly and preparation method thereof

Abstract

The invention relates to the technical field of composite material connection, and particularly discloses a special-shaped composite material connecting assembly and a preparation method thereof. The special-shaped composite material connecting assembly is used for connecting a first connecting composite material and a second connecting composite material. A second embedding part is arranged on the second connecting composite material, and a first embedding part is arranged on the first connecting composite material; the special-shaped composite material connecting assembly comprises a connecting ring, a first connecting ring and a second connecting ring, wherein the connecting ring is provided with a first connecting bulge corresponding to the first embedding part; a second connecting bulge corresponding to the second embedding part is arranged on the connecting ring; the winding piece is wound and covered above the first embedding part and the second embedding part; and the content filling piece is completely arranged in the first connecting composite material and the second connecting composite material in a filling manner. According to the special-shaped composite material connecting assembly, through the attached connection of the embedding part and the connecting protrusion and the arrangement of the winding piece and the content filling piece, the anti-sliding load and the connecting stability are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material connection, and particularly to a special-shaped composite material connection component and a preparation method thereof. Background Art

[0002] In the field of building construction, it is often necessary to connect two concrete composite materials or steel composite materials before use. The common connection method is to drill corresponding holes in the formwork to be connected, and then connect them through screws, nuts, bolts, etc. The installation process is numerous and complex. Moreover, due to the drilling, the original structure of the composite material is damaged, which will lead to a decline in the performance of the composite material and cracks are likely to appear when using the composite material.

[0003] Therefore, the existing composite material connection methods are complex and have many processes. The connection process is likely to cause damage to the original structure of the composite material, and there are problems of low connection stability of the composite material and decline in the performance of the composite material. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of the present application is to provide a special-shaped composite material connection component and a preparation method thereof, aiming to solve the problems of complex composite material connection methods, low connection stability, and decline in the performance of the composite material existing in the prior art.

[0005] To solve the above technical problems, the purpose of the present invention is achieved through the following technical solutions:

[0006] On the one hand, the present invention discloses a special-shaped composite material connection component for connecting a first connection composite material and a second connection composite material; both the first connection composite material and the second connection composite material are of hollow structures; one end of the first connection composite material close to the second connection composite material is provided with a first fitting portion, and one end of the second connection composite material close to the first connection composite material is provided with a second fitting portion;

[0007] The special-shaped composite material connection component includes:

[0008] A connection ring, at a position corresponding to the first fitting portion on the connection ring, a first connection protrusion is provided, and the first connection protrusion is used for fitting connection with the first fitting portion; moreover, at a position corresponding to the second fitting portion on the connection ring, a second connection protrusion is provided, and the second connection protrusion is used for fitting connection with the second fitting portion;

[0009] A winding member for winding and covering the outside of the connection ring; one end of the winding member is attached to the outer wall of the first connection composite material, and the other end of the winding member is attached to the outer wall of the second connection composite material;

[0010] A content filling member for completely filling and arranging inside the first connection composite material and the second connection composite material.

[0011] Optionally, the first connecting protrusion and the second connecting protrusion are located on the inner wall of the connecting ring.

[0012] Optionally, the thickness ratio of the connecting ring, the first connecting composite material, and the second connecting composite material is (0.4 - 0.8):(0.8 - 1.2):1.

[0013] Optionally, the sum of the thickness of the connecting ring and the thickness of the first fitting portion is 3 - 5 mm, and the sum of the thickness of the connecting ring and the thickness of the second fitting portion is 3 - 5 mm; the lengths of the first fitting portion and the second fitting portion are both 15 - 30 mm.

[0014] Optionally, the heights of the first connecting protrusion and the second connecting protrusion are both 0.5 - 0.8 mm; the first connecting protrusion and the second connecting protrusion are both serrated structures, and the angle of the serrated structure is less than or equal to 90°.

[0015] Optionally, the hardness ratio of the first connecting protrusion to the first fitting portion and the hardness ratio of the second connecting protrusion to the second fitting portion are both 1.5 - 6.0.

[0016] Optionally, the winding direction of the winding member and the axial direction of the first connecting composite material, and the winding direction of the winding member and the axial direction of the second connecting composite material are both acute angles.

[0017] On the other hand, the present invention also discloses a method for preparing a special-shaped composite material connection assembly as described above, including the following steps:

[0018] S1: Fit and connect the first connecting protrusion and the second connecting protrusion of the connecting ring with the first fitting portion and the second fitting portion respectively;

[0019] S2: Completely wind and cover the outside of the connecting ring with the winding member;

[0020] S3: Completely pour and fill the content filler into the first connecting composite material and the second connecting composite material. After the content filler is cured, a special-shaped composite material connection assembly is obtained;

[0021] The winding member includes fibers and resin, and the volume content of the fibers is greater than or equal to 50%;

[0022] The compressive strength of the content filler is greater than or equal to 30 MPa.

[0023] Optionally, the connecting ring is obtained by 3D printing; the content filler is concrete, and the pouring and filling is a one-time filling.

[0024] Optionally, the fibers are selected from at least one of glass fiber, carbon fiber, basalt fiber, and aramid, and the resin is selected from at least one of epoxy resin, vinyl resin, and polyester resin.

[0025] Beneficial effects:

[0026] In a special-shaped composite connection component and its preparation method of the present invention, the special-shaped composite connection component includes a connection ring, a winding member, and a content filling member. First, by applying sufficient pre-tightening force, the first connection protrusion and the second connection protrusion of the connection ring are respectively fitted and connected with the first fitting portion and the second fitting portion, so that the connection ring, the first connection composite material, and the second connection composite material are tightly connected, improving the anti-slip load and connection stability at the connection; then, the winding member is wound around the connection between the connection ring and the first connection composite material and the second connection composite material. Due to the surface tension, the winding member will contract inward, thereby increasing the vertical pressure between the connection ring and the first connection composite material, and between the connection ring and the second connection composite material at the connection, further enhancing the anti-slip load and connection stability at the connection, and it can be connected without punching holes, adding screws, etc., with simple processes and improved connection efficiency; finally, the content filling member is completely filled inside the first connection composite material and the second connection composite material. When the overall special-shaped composite connection component is subjected to external pressure, due to the Poisson effect, the content filling member will expand outward, thereby increasing the vertical pressure and lateral anti-slip load between the connection ring and the first connection composite material, and the second connection composite material, further improving the overall connection stability. Brief description of the drawings

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 It is a cross-sectional view of the special-shaped composite connection component of the present invention;

[0029] Figure 2 It is a schematic diagram of the special-shaped composite connection component of the present invention;

[0030] Figure 3 It is a partial enlarged cross-sectional view of the special-shaped composite connection component of the present invention;

[0031] Figure 4 It is a partial enlarged cross-sectional view of another embodiment of the special-shaped composite connection component of the present invention;

[0032] Figure 5 It is a schematic diagram of another embodiment of the special-shaped composite connection component of the present invention;

[0033] Figure 6The front view, left view, and top view of the protrusion (the first protrusion and / or the second protrusion) or the connecting protrusion (the first connecting protrusion or the second connecting protrusion) of the present invention.

[0034] Explanation of reference numerals:

[0035] 1. First connecting composite material; 11. First fitting part; 111. First protrusion; 2. Second connecting composite material; 21. Second fitting part; 211. Second protrusion; 3. Connecting ring; 31. First connecting protrusion; 32. Second connecting protrusion; 4. Winding member; 5. Content filling member. Detailed implementation manners

[0036] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0037] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0038] Refer to the attached Figure 1 , a special-shaped composite material connecting component for connecting a first connecting composite material 1 and a second connecting composite material 2.

[0039] Both the first connecting composite material 1 and the second connecting composite material 2 are of a hollow structure; a second fitting part 21 is provided at one end of the second connecting composite material 2 close to the first connecting composite material 1, and a first fitting part 11 is provided at one end of the first connecting composite material 1 close to the second connecting composite material 2.

[0040] The special-shaped composite material connecting component includes a connecting ring 3, a winding member 4, and a content filling member 5:

[0041] A first connecting protrusion 31 is provided at a position on the connecting ring 3 corresponding to the first fitting part 11, and the first connecting protrusion 31 is in fitting connection with the first fitting part 11; and, a second connecting protrusion 32 is provided at a position on the connecting ring 3 corresponding to the second fitting part 21, and the second connecting protrusion 32 is in fitting connection with the second fitting part 21;

[0042] The winding member 4 winds and covers the outside of the connecting ring 3; one end of the winding member 4 is in contact with the outer wall of the first connecting composite material 1, and the other end of the winding member 4 is in contact with the outer wall of the second connecting composite material 2;

[0043] The content filling member 5 is completely filled inside the first connecting composite material 1 and the second connecting composite material 2.

[0044] One end of the first connecting composite material 1 is provided with a first fitting portion 11, and the first section of the second connecting composite material 2 is provided with a second fitting portion 21; the connecting ring 3 is provided with a first connecting protrusion 31 corresponding to the first fitting portion 11 and a second connecting protrusion 32 corresponding to the second fitting portion 21. Therefore, this application is an optimization of the connection method for composite materials with special shapes, and can improve the anti-slip load of the connecting ring 3, the first connecting composite material 1 and the second connecting composite material 2 through the fitting connection between the fitting portion and the connecting protrusion. The connecting ring 3, the first connecting composite material 1 and the second connecting composite material 2 are preferably made of steel materials commonly used in construction sites, which is convenient for immediate processing and application at the construction site. The first fitting portion 11 and the second fitting portion 21 are the connection parts between the first connecting composite material 1 and the second connecting composite material 2 and the connecting ring 3.

[0045] The winding member 4 includes fibers and resin. Among them, the resin can bond the fibers together to facilitate the construction of the connection between the fibers; it can also bond the fibers to the first connecting composite material 1 and the second connecting composite material 2, so that when the first connecting composite material 1 and the second connecting composite material 2 are subjected to external forces, the inward contraction force between the fibers can prevent the first connecting composite material 1 and the second connecting composite material 2 from separating; the winding member 4 can utilize the adhesive force and contraction force of the fibers and the resin to enhance the connection stability of the connecting ring 3, the first connecting composite material 1 and the second connecting composite material 2.

[0046] Reference appendix Figure 5 The cross-sectional shapes of the first connecting composite material 1 and the second connecting composite material 2 are not limited. The first connecting composite material 1 and the second connecting composite material 2 can both be pipeline composite materials such as circular pipes, square pipes, and diamond pipes; and the cross-sectional sizes at different positions of the first connecting composite material 1 and the second connecting composite material 2 can be different. Specifically, the first connecting composite material 1 and the second connecting composite material 2 can both be structures with a large cross-sectional area at one end and a small cross-sectional area at the other end, or structures with a large cross-sectional area in the middle part and small cross-sectional areas at both ends, etc., that is, non-standard special-shaped structures with different cross-sectional sizes at different positions.

[0047] Reference appendix Figure 2 and Figure 3 Furthermore, in some embodiments, the first connecting protrusion 31 and the second connecting protrusion 32 are located on the inner wall of the connecting ring 3; the setting on the same side can facilitate the preparation of the connecting ring 3. Specifically, the connecting ring 3 can be obtained by 3D printing.

[0048] The first connecting protrusion 31 and the second connecting protrusion 32 are located on the inner wall of the connecting ring 3. The connecting ring 3 is sleeved on the outer sides of the first fitting part 11 and the second fitting part 21, so that the first connecting protrusion 31 is in close contact with the first fitting part 11, and the second connecting protrusion 32 is in close contact with the second fitting part 21. The settings of the first connecting protrusion 31 and the second connecting protrusion 32 can improve the connection tightness between the first connecting protrusion 31 and the first fitting part 11, and between the second connecting protrusion 32 and the second fitting part 21, thereby stably connecting the first connecting composite material 1 and the second connecting composite material 2 through the connecting ring 3. Preferably, the connecting ring 3 can be nested on the outer sides of the first fitting part 11 and the second fitting part 21 by an external force, so that the first connecting protrusion 31 and the first fitting part 11, and the second connecting protrusion 32 and the second fitting part 21 are in interference connection.

[0049] The winding member 4 is wound around the outer wall of the connecting ring 3 to completely cover the connecting ring 3. At the same time, one end exceeding the connecting ring 3 is in contact with the outer wall of the first connecting composite material 1, and the other end exceeding the connecting ring 3 is in contact with the outer wall of the first connecting composite material 1; while the content filler is completely filled inside the first connecting composite material 1 and the second connecting composite material 2 and is in contact with the inner walls of the first connecting composite material 1 and the second connecting composite material 2.

[0050] When the first connecting protrusion 31 and the second connecting protrusion 32 are located on the inner wall of the connecting ring 3, the first protrusion 111 is located on the outer wall of the first fitting part 11, and the second protrusion 211 is located on the outer wall of the second fitting part 21. After the first connecting protrusion 31 and the first protrusion 111, and the second connecting protrusion 32 and the second protrusion 211 are tightly engaged.

[0051] In addition, a connecting ring 3 with the first connecting protrusion 31 and the second connecting protrusion 32 on its outer wall can also be provided. While the first fitting part 11 of the first connecting composite material 1 is sleeved on the outer side of the first connecting protrusion 31, the second fitting part 21 of the second connecting composite material 2 is sleeved on the outer side of the second connecting protrusion 32, thereby stably connecting the first connecting composite material 1 and the second connecting composite material 2 through the connecting ring 3. The connecting member 3 here can play a role in supporting and connecting the first connecting composite material 1 and the second connecting composite material 2. Combined with the winding member 4 wound around the outer sides of the first connecting composite material 1 and the second connecting composite material 2, the connection stability of the first connecting composite material 1 and the second connecting composite material 2 can be further improved.

[0052] Specifically, in some embodiments, there may be two or more connecting rings 3, among which there is at least one connecting ring 3 with a first connecting protrusion 31 and a second connecting protrusion 32 located on the inner wall, and at least one connecting ring 3 with a first connecting protrusion 31 and a second connecting protrusion 32 located on the outer wall; through the sandwich setting of the connecting ring 3 - the first fitting part 11, the second fitting part 21 - the connecting ring 3 from the inside to the outside, the anti-slip load and connection stability between the connecting ring 3, the first connecting composite material 1, and the second connecting composite material 2 are further improved.

[0053] The thickness ratio of the connecting ring 3, the first connecting composite material 1, and the second connecting composite material 2 is preferably (0.8 - 1.2):(0.9 - 1.1):1. This can prevent poor fitting due to an inappropriate thickness ratio; and prevent insufficient compressive strength and hardness caused by one of the connecting ring 3, the first connecting composite material 1, and the second connecting composite material 2 having too small a thickness, thereby avoiding breakage during the force application process.

[0054] The sum of the thickness of the connecting ring 3 and the thickness of the first fitting part 11 is preferably 3 - 5 mm, and the sum of the thickness of the connecting ring 3 and the thickness of the second fitting part 21 is preferably 3 - 5 mm; the lengths of the first fitting part 11 and the second fitting part 21 are both 15 - 30 mm. Under the limitation of this thickness and length, on the one hand, it can provide sufficient anti-slip load; on the other hand, it can prevent the cumbersome processing of the connecting ring 3, the first fitting part 11, and the second fitting part 21 caused by too many special-shaped settings, thereby reducing the connection efficiency. The heights of the first connecting protrusion 31 and the second connecting protrusion 32 are both preferably 0.5 - 0.8 mm; the first connecting protrusion 31 and the second connecting protrusion 32 are both serrated structures, and the angle of the serrated structure is less than or equal to 90°, and the serrated angle is preferably 30 - 75°. Specifically, the first connecting protrusion 31 and the second connecting protrusion 32 are both laterally inverted triangular prism shapes, which can have a certain compressive strength, and at the same time are convenient for tightly meshing with the first fitting part 11 and the second fitting part 21, improving the anti-slip load and connection stability; and according to the adhesion friction theory, the triangular prism structure can have a high anti-slip load even when the friction coefficients of the first connecting protrusion 31 and the second connecting protrusion 32 are relatively low. Specifically, the friction coefficient can be 1 - 1.5.

[0055] The hardness ratio of the first connecting protrusion 31 to the first fitting part 11 and the hardness ratio of the second connecting protrusion 32 to the second fitting part 21 are both 1.5 - 6.0; that is, the hardness ratio of the connecting ring 3 to the first connecting composite material 1 and the second connecting composite material 2 is both 1.5 - 6.0. This hardness range is applicable to the vast majority of steel materials and can prevent damage caused by excessive wear.

[0056] The winding direction of the winding member 4 and the axial direction of the first connecting composite material 1, and the winding direction of the winding member 4 and the axial direction of the second connecting composite material 2 are preferably acute angles, which can decompose the force into a vertical force and an axial force along the connection during compression, thereby increasing the contact friction between the winding member 4 and the connection, preventing the winding member 4 from sliding, and also being able to disperse the applied force, reducing the pressure at the stressed part, suppressing and alleviating the occurrence of local buckling and deformation, and prolonging the overall service life by decomposing the force. More preferably, the angle between the winding direction and the axial direction of the composite material (including the first connecting composite material 1 and the second connecting composite material 2) is 60 - 89.9°. The thickness of the winding member 4 is preferably 1 - 6 mm.

[0057] Combined with reference Figure 4 , in order to further improve the connection stability between the first connecting composite material 1 and the connecting ring 3, and between the second connecting composite material 2 and the connecting ring 3, a first protrusion 111 may be provided on the first fitting portion 11 of the first connecting composite material 1, and a second protrusion 211 may be provided on the second fitting portion 21 of the second connecting composite material 2; the first protrusion 111 on the connecting ring 3 corresponds to the first connecting protrusion 31, and the second protrusion 211 corresponds to the second connecting protrusion 32. Therefore, the anti-slip load of the connecting ring 3, the first connecting composite material 1, and the second connecting composite material 2 can be improved through the meshing connection between the protrusions and the connecting protrusions. The first protrusion 111 and the second protrusion 211 may have the same structure, which can further facilitate the preparation of the connecting ring 3.

[0058] The first protrusion 111 and the second protrusion 211 are respectively arranged corresponding to the first connecting protrusion 31 and the second connecting protrusion 32, and the height is preferably 0.5 - 0.8 mm; the first protrusion 111 and the second protrusion 211 can both be serrated structures, the angle of the serrated structure is less than or equal to 90°, and the serrated angle is preferably 30 - 75°. At the same time, the first protrusion 111 and the second protrusion 211 can both be laterally inverted triangular prism shapes; and the friction coefficients between the first protrusion 111 and the first connecting protrusion 31, and between the second protrusion 211 and the second connecting protrusion 32 are preferably 1 - 1.5.

[0059] The hardness ratios between the first connecting protrusion 31 and the first protrusion 111, and between the second connecting protrusion 32 and the second protrusion 211 can both be 1.5 - 6.0. This hardness range can be applicable to the vast majority of steel materials to prevent damage caused by excessive wear. A preparation method for a special-shaped composite material connection assembly for preparing the above-mentioned special-shaped composite material connection assembly includes the following steps:

[0060] S1: Fit and connect the first connecting protrusion and the second connecting protrusion of the connecting ring with the first fitting portion and the second fitting portion respectively;

[0061] S2: Completely wind and cover the winding member on the outside of the connecting ring;

[0062] S3: Completely pour and fill the content filler into the first connecting composite material and the second connecting composite material. After the content filler is cured, a special-shaped composite material connecting component is obtained.

[0063] The winding member comprises fibers and resin, and the volume content of the fibers is greater than or equal to 50%.

[0064] The compressive strength of the content filler is greater than or equal to 30 MPa.

[0065] Among them, the connecting ring is obtained by 3D printing, making the preparation of the connecting ring with the first connecting protrusion and the second connecting protrusion more simple and fast. The content filler is concrete or gypsum, etc., which are common components in construction and can be quickly obtained and used. The pouring and filling is a one-time filling. One-time filling can prevent excessive bubbles from being generated during multiple pouring processes, thereby preventing the structure of the content filler from being too loose, enhancing the density of the content filler to improve its compressive strength and hardness; and it is convenient for subsequent stress processes, and Poisson's effect can occur to expand outward, thereby squeezing the first connecting composite material and the second connecting composite material to enhance its anti-slip load; specifically, when the content filler is not completely filled in the first connecting composite material and the second connecting composite material, or the porosity in the content filler is too large, Poisson's effect cannot be generated. Specifically, the porosity is preferably less than 20%; and in order to improve the compressive strength and the integrity of the skeleton structure of the content filler, fibers such as glass fiber, carbon fiber, basalt fiber, aramid, etc. can be added to it.

[0066] The winding member is obtained by curing fibers infiltrated into resin. Specifically, the volume content of the fibers is preferably greater than or equal to 50%, which can enable the resin to fully wrap the fibers, giving play to the corrosion resistance and viscosity of the resin, and at the same time providing sufficient circumferential and axial compressive strength through the fibers to withstand external and internal pressures. The fibers are preferably at least one selected from glass fiber, carbon fiber, basalt fiber, aramid; and the resin is preferably at least one selected from epoxy resin, vinyl resin, polyester resin.

[0067] This preparation method is simple and easy to operate, without the need for labor, and will not damage the original structure of the composite material, enabling the first connecting composite material and the second connecting composite material to be tightly connected, improving the anti-slip load and connection stability at the connection.

[0068] Example 1, A preparation method of a special-shaped composite material connecting component is as follows.

[0069] S1: Prepare the connecting ring using 3D modeling, and then apply a pre-tightening force to closely fit the first connecting protrusion and the second connecting protrusion of the connecting ring with the first fitting part and the second fitting part respectively; wherein, both the first connecting protrusion and the second connecting protrusion are arranged on the inner wall of the connecting ring. Both the first connecting protrusion and the second connecting protrusion are in the shape of a laterally inverted triangular prism, which is a serrated structure, the serration angle is 60°, and the height is 0.6 mm; the sum of the thickness of the connecting ring and the thickness of the first fitting part, and the sum of the thickness of the connecting ring and the thickness of the second fitting part are both 4 mm; the lengths of the first fitting part and the second fitting part are 25 mm, and the length of the connecting ring is 50 mm; the thickness of the connecting ring is 2 mm, the overall thickness of the first connecting composite is 4 mm, the overall thickness of the second connecting composite is 4 mm, and the thickness ratio is 1:2:2. Moreover, the connecting piece, the first connecting composite and the second connecting composite are all made of steel, and the hardness ratio is 3:1.

[0070] S2: Completely cover and wind the winding piece (fibers infiltrated in resin after semi-curing or curing) on the outer wall of the connecting ring along a direction with an axial angle of 60° with respect to the first connecting composite (the axes of the first connecting composite and the second connecting composite are the same). At the same time, both ends of the winding piece extend 5 mm beyond the connecting ring, one end is in contact with the first connecting composite, and the other end is in contact with the second connecting composite. Wherein, the resin is epoxy resin, the fiber is carbon fiber, and the volume ratio of the resin to the fiber is 45:55; the thickness of the winding piece is 4 mm.

[0071] S3: Pour and fill the content filling piece into the first connecting composite and the second connecting composite completely at one time. After the content filling piece is cured, a special-shaped composite connecting component is obtained. Wherein, the content filling piece is a commercially available ultra-high performance concrete (i.e., UHPC, the compressive strength can reach 810 MPa), and it is poured and filled at one time according to the usage instructions, and the porosity is less than 10%.

[0072] Example 2, A preparation method of a special-shaped composite connecting component is as follows.

[0073] S1: Prepare the connecting ring using 3D modeling, and then apply a pre-tightening force to closely fit the first connecting protrusion and the second connecting protrusion of the connecting ring with the first fitting part and the second fitting part respectively; wherein, both the first connecting protrusion and the second connecting protrusion are arranged on the outer wall of the connecting ring. Both the first connecting protrusion and the second connecting protrusion are laterally inverted triangular prism shapes, which are serrated structures, the serration angle is 45°, and the height is 0.5 mm; the sum of the thickness of the connecting ring and the thickness of the first fitting part, and the sum of the thickness of the connecting ring and the thickness of the second fitting part are both 3.0 mm; the length of the first fitting part is 15 mm, the length of the second fitting part is 30 mm, and the length of the connecting ring is 45 mm; the thickness of the connecting ring is 2.1 mm, the overall thickness of the first connecting composite material is 2.7 mm, the overall thickness of the second connecting composite material is 3.0 mm, and the thickness ratio is 0.7:0.9:1. Moreover, the connecting piece, the first connecting composite material, and the second connecting composite material are all made of steel, and the hardness ratio is 1.5:1.

[0074] S2: Completely cover and wind the winding piece (fibers infiltrated in resin in a semi-cured or cured state) on the outer walls of the first fitting part and the second fitting part along a direction with an axial angle of 75° with respect to the first connecting composite material (the first connecting composite material and the second connecting composite material have the same axis). At the same time, both ends of the winding piece extend beyond the connecting ring. One end extends 4 mm beyond the connecting ring and fits with the first connecting composite material, and the other end extends 6 mm beyond the connecting ring and fits with the second connecting composite material. Among them, the resin is vinyl resin, the fiber is carbon fiber, and the volume ratio of the resin to the fiber is 1:1; the thickness of the winding piece is 2 mm.

[0075] S3: Pour and fill the content filling piece into the first connecting composite material and the second connecting composite material completely at one time. After the content filling piece is cured, an irregular composite material connecting component is obtained. Among them, the content filling piece is commercially available C30 concrete, and it is poured and filled at one time according to the usage instructions, and the porosity is less than 20%.

[0076] Example 3, A preparation method of an irregular composite material connecting component is as follows.

[0077] S1: Prepare the connecting ring using 3D modeling, and then apply a pre-tightening force to closely fit the first connecting protrusion and the second connecting protrusion of the connecting ring with the first fitting part and the second fitting part respectively; wherein, both the first connecting protrusion and the second connecting protrusion are arranged on the inner wall of the connecting ring. Both the first connecting protrusion and the second connecting protrusion are laterally inverted triangular prism shapes, which are serrated structures with a serration angle of 90° and a height of 0.8 mm; the sum of the thickness of the connecting ring and the thickness of the first fitting part, and the sum of the thickness of the connecting ring and the thickness of the second fitting part are both 3.3 mm; the length of the first fitting part is 30 mm, the length of the second fitting part is 15 mm, and the length of the connecting ring is 45 mm; the thickness of the connecting ring is 1.5 mm, the overall thickness of the first connecting composite is 3.3 mm, the overall thickness of the second connecting composite is 3.3 mm, and the thickness ratio is 0.5:1:1. Moreover, the connecting piece, the first connecting composite, and the second connecting composite are all made of steel, and the hardness ratio is 4:1.

[0078] S2: Completely cover and wind the winding piece (fibers infiltrated in resin in a semi-cured or cured state) on the outer wall of the connecting ring along a direction with an axial angle of 89° with respect to the first connecting composite (the axials of the first connecting composite and the second connecting composite are the same). At the same time, both ends of the winding piece extend beyond the connecting ring. One end extends 6 mm beyond the connecting ring and fits with the first connecting composite, and the other end extends 4 mm beyond the connecting ring and fits with the second connecting composite. Among them, the resin is polyester resin, the fiber is basalt fiber, and the volume ratio of the resin to the fiber is 4:6; the thickness of the winding piece is 3 mm.

[0079] S3: Completely pour and fill the content filling piece into the first connecting composite and the second connecting composite at one time. After the content filling piece is cured, an irregular composite connecting assembly is obtained. Among them, the content filling piece is commercially available C60 concrete and gypsum, and the mass ratio of the two is 1:1. It is poured and filled at one time according to the usage instructions, and the porosity is less than 10%.

[0080] Reference appendix Figure 6 , according to the adhesion friction theory, the frictional force is the sum of the resistance generated by the adhesion effect and the plowing effect. Assume that the rough peaks on the surface of the harder material (such as the first protrusion or the second protrusion) are composed of many cones with a bottom diameter of d, an embedding depth of h, and a half angle of θ. The projected area A of the contact surface on the horizontal plane = πd 2 / 8, and the projected area S on the vertical plane = dh / 2. Then the frictional force F when a single rough peak slides includes the shear force Aτ b and the plowing force Sσ s , that is:

[0081] F = Aτ b + Sσ s , Equation (1);

[0082] Then the expression of the friction coefficient f is:

[0083]

[0084] W is the yield load (N) of the softer material, and W = Aσ s ; τ b is the shear strength (MPa) of the adhesive joint, approximately equal to the shear strength of the softer material (such as the first connecting protrusion or the second connecting protrusion of the connecting ring); σ s is the yield strength (MPa) of the softer material. Given that α = (σ s / τ b ) 2 , for metal materials, α is usually taken as 25, that is, τ b = 0.2σ s ; for other materials, α is usually taken as 9, that is, τ b = 0.33σ s .

[0085] The embedding depth h can be calculated by the Hertz contact formula in the elastic deformation stage. When the harder material is pressed into the softer material with a small load, the embedding depth h is mainly dominated by elastic deformation and can be expressed by the Hertz contact formula as follows:

[0086]

[0087] E * is the equivalent elastic modulus (N / mm 2 ), 1 / E * = (1 - ν1 2 ) / E1 + (1 - ν2 2 ) / E2, where E1 and E2 are the elastic moduli of the two materials respectively, and ν1 and ν2 are the Poisson's ratios of the two materials respectively; R is the radius of the indenter (mm), and R = d / 2.

[0088] Table 1 Material parameters related to friction force calculation for each material

[0089]

[0090] Take three materials in Table 1 as the combination of the connecting ring and the connecting composite material (the first connecting composite material and / or the second connecting composite material), and calculate parameters such as the friction force F and the friction coefficient f based on the adhesive friction theory. The results are shown in Table 2 and Table 3.

[0091] First, determine the hardness relationship between the two combined materials according to the Brinell hardness of the materials, calculate the equivalent elastic modulus E * , take the bottom diameter d of the asperity as 0.1 mm, assume that the vertical load P is equal to the yield load W of the softer material, substitute it into Equation (1) to calculate the embedding depth h, and calculate the projected area A of the contact surface on the horizontal plane and the projected area S on the vertical plane.

[0092] Substitute the yield strength σ s and shear strength τ b of the softer material into Equation (3) to calculate the friction coefficient f for different values of the half-angle θ of the asperity peaks (30°, 45°, 60°).

[0093] Finally, substitute all the known parameters into Equation (1) to separately obtain the shear force Aτ b and the plowing force Sσ s , and obtain the resultant frictional force F of the two, which is also the frictional force when a single asperity peak slides.

[0094] Table 2 Parameter table of the single-peak frictional force after different combinations of connecting rings and connecting composites

[0095]

[0096]

[0097] Table 3 Performance table of the single-peak frictional force after different combinations of connecting rings and connecting composites

[0098]

[0099] It can be seen from Table 2 and Table 3 that the friction coefficient f is mainly affected by the half-angle θ of the asperity peak. When θ = 30°, f can reach a maximum of 1.68. Although the yield strength σ s and shear strength τ b of the softer material have a certain influence on the calculation result of the friction coefficient f, since the influence of the first term in Equation (2) on the result is relatively small, the influence of the softer material strength on f can be ignored when the value of the half-angle θ of the asperity peak is relatively large.

[0100] The frictional force F is composed of the shear force Aτ b and the plowing force Sσ s . The shear force Aτ b makes a greater contribution to the resultant force. The plowing force Sσ s is only 1 / 38 - 1 / 12 of the former. The shear force Aτ b is affected by the horizontal projected area A of the asperity peak and the shear strength τ b of the softer material. The shear component force can be increased by increasing the above variables. The influencing factors of the plowing force Sσ s are relatively complex. On the one hand, it is affected by the yield strength of the softer material. On the other hand, when the equivalent elastic modulus of the material is relatively small, the embedding depth h increases, thereby increasing the value of the plowing force Sσ s and its proportion in the resultant force.

[0101] Therefore, when the connecting ring engages with the connecting composite material (the first connecting composite material and / or the second connecting composite material), the half-angle θ of the connecting protrusions (including the first connecting protrusion and the second connecting protrusion) and the protrusions (the first protrusion and / or the second protrusion) should be as small as possible, and the full angle is preferably less than or equal to 90°, which can make the friction coefficient have a larger value; when selecting materials, it should be ensured that the equivalent elastic modulus E of the combination of the connecting ring (harder material) and the connecting composite material (softer material) * is as small as possible (affected by the elastic modulus and Poisson's ratio of the two), and the hardness ratio of the two is preferably 1.5 - 6.0 to increase the embedding depth h, thereby increasing the plowing force Sσ s ; it should also be noted that when the yield strength σ s and shear strength τ b of the softer material increase, the plowing force Sσ s and shear force Aτ b will also increase accordingly.

[0102] In a special-shaped composite material connecting component and its preparation method provided by the present invention, the special-shaped composite material connecting component includes a connecting ring, a winding member, and a content filling member. First, by applying sufficient pre-tightening force, the first connecting protrusion and the second connecting protrusion of the connecting ring are respectively attached and connected to the first fitting portion and the second fitting portion, so that the connecting ring, the first connecting composite material, and the second connecting composite material are tightly connected, improving the anti-slip load and connection stability at the connection; then, the winding member is wound around the connection between the connecting ring and the first connecting composite material and the second connecting composite material. Due to the surface tension, the winding member will contract inward, thereby increasing the vertical pressure between the connecting ring and the first connecting composite material, and between the connecting ring and the second connecting composite material at the connection, further enhancing the anti-slip load and connection stability at the connection, and it can be connected without punching, adding screws, etc., with simple processes, improving the connection efficiency; finally, the content filling member is completely filled inside the first connecting composite material and the second connecting composite material. When the special-shaped composite material connecting component as a whole is subjected to external pressure, due to Poisson's effect, the content filling member will expand outward, thereby increasing the vertical pressure and lateral anti-slip load between the connecting ring and the first connecting composite material and the second connecting composite material, further improving the overall connection stability.

[0103] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or replacements, and these modifications or replacements should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A special-shaped composite connection component for connecting a first connecting composite and a second connecting composite; both the first connecting composite and the second connecting composite are of hollow structures; one end of the first connecting composite close to the second connecting composite is provided with a first fitting part, and one end of the second connecting composite close to the first connecting composite is provided with a second fitting part; characterized in that, The special-shaped composite connection component includes: A connecting ring, at a position corresponding to the first fitting part on the connecting ring, a first connecting protrusion is provided, and the first connecting protrusion is used for fitting connection with the first fitting part; and, at a position corresponding to the second fitting part on the connecting ring, a second connecting protrusion is provided, and the second connecting protrusion is used for fitting connection with the second fitting part; A winding member for winding and covering the outer side of the connecting ring; one end of the winding member is attached to the outer wall of the first connecting composite, and the other end of the winding member is attached to the outer wall of the second connecting composite; A content filling member for completely filling the inside of the first connecting composite and the second connecting composite.

2. The special-shaped composite material connection component according to claim 1, wherein, The first connecting protrusion and the second connecting protrusion are located on the inner wall of the connecting ring.

3. The special-shaped composite material connection component according to claim 1, wherein The thickness ratio of the connecting ring, the first connecting composite and the second connecting composite is (0.4 - 0.8):(0.8 - 1.2):

1.

4. The special-shaped composite material connection component according to claim 1, characterized in that, The sum of the thickness of the connecting ring and the thickness of the first fitting part is 3 - 5 mm, and, the sum of the thickness of the connecting ring and the thickness of the second fitting part is 3 - 5 mm; the lengths of both the first fitting part and the second fitting part are 15 - 30 mm.

5. The special-shaped composite material connection component according to claim 1, characterized in that The heights of both the first connecting protrusion and the second connecting protrusion are 0.5 - 0.8 mm; both the first connecting protrusion and the second connecting protrusion are of serrated structures, and the angle of the serrated structure is less than or equal to 90°.

6. The special-shaped composite material connection component according to claim 1, characterized in that The hardness ratio of the first connecting protrusion to the first fitting part and the hardness ratio of the second connecting protrusion to the second fitting part are both 1.5 - 6.

0.

7. The special-shaped composite material connection component according to claim 1, characterized in that The winding direction of the winding member and the axial direction of the first connecting composite, and the winding direction of the winding member and the axial direction of the second connecting composite are both acute angles.

8. A method for preparing a special-shaped composite connection component according to any one of claims 1-7, characterized in that, Including the following steps: S1: Fit and connect the first connecting protrusion and the second connecting protrusion of the connecting ring with the first fitting part and the second fitting part respectively; S2: Completely wind and cover the winding member on the outer side of the connecting ring; S3: Completely pour and fill the content filling member into the first connecting composite and the second connecting composite, and after the content filling member is cured, a special-shaped composite connection component is obtained; The winding member contains fibers and resin, and the volume content of the fibers is greater than or equal to 50%; The compressive strength of the content filling member is greater than or equal to 30 MPa.

9. The preparation method of the special-shaped composite material connection component according to claim 8, characterized in that, The connecting ring is obtained by 3D printing; the content filling member is concrete, and the pouring and filling is a one-time filling.

10. The preparation method of the special-shaped composite material connection component according to claim 8, characterized in that, The fibers are selected from at least one of glass fiber, carbon fiber, basalt fiber, and aramid, and the resin is selected from at least one of epoxy resin, vinyl resin, and polyester resin.

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