A method for manufacturing a connecting joint of a carbon fiber fixed arc plate and a metal support of a hydrogen storage cylinder

Abstract

The application discloses a manufacturing method of a connecting joint of a carbon fiber fixed arc plate and a metal pillar of a hydrogen storage cylinder, and comprises the following steps: according to the structure and size of the carbon fiber composite material plate and the metal pillar to be connected, designing the size, arc, layering mode of the connecting joint and the micro columnar structure on the surface of the metal pillar to obtain a model of the overall structure; simulating and analyzing the model to optimize the carbon fiber and resin material, the layering mode of the composite material and the micro columnar structure on the surface of the metal pillar of the connecting joint to obtain the final manufacturing parameters of the joint; according to the model, manufacturing the micro columnar structure on the surface of the metal pillar and the corresponding clamp required by layering; and layering and connecting the designed connecting joint. The application is suitable for the connection of the out-of-plane carbon fiber composite material and the metal material with special-shaped structures, and can overcome the defects of the traditional connection and ensure the strength of the connecting joint.

Description

Technical Field

[0001] This invention belongs to the field of carbon fiber and metal material connection technology, and particularly relates to a manufacturing method of a connection joint between a carbon fiber fixing arc plate and a metal support column of a hydrogen storage cylinder. Background Technology

[0002] With the widespread application of hydrogen energy, the application scenarios of hydrogen storage cylinders in the automotive, aerospace, and military industries are constantly expanding. The use of traditional metal materials alone can no longer fully meet the installation requirements of different scenarios. Compared with traditional metal materials and other composite materials, carbon fiber composite materials have the advantages of high strength and high specific strength, which can significantly improve the overall performance of structures in structural applications while meeting the requirements of lightweighting. However, with the further application of carbon fiber composite materials, many situations are not suitable for structures made of a single carbon fiber composite material, and often require carbon fiber composite materials to be connected with other materials (especially metal materials).

[0003] However, the connection between carbon fiber composites and metal materials is complex. Current methods for connecting carbon fiber composites and metal materials mostly involve adhesive bonding, bolting, and cold riveting. Adhesive bonding is simple, but adhesive aging and detachment can occur, leading to separation of the two components, posing a serious safety hazard in high-speed applications. Furthermore, the performance of adhesive bonding is easily affected by the environment. Self-piercing riveting technology for carbon fiber composites is more complex than riveting technology for metal materials. Stress concentration occurs at the joint, and both the carbon fiber composite and metal materials are prone to fracture at the rivet tip, resulting in reduced joint strength. In addition, self-piercing riveting technology requires a certain degree of ductility from the metal material, limiting the applicable metals for self-piercing riveting of carbon fiber composites and metal materials. Bolting can damage both the carbon fiber composite and metal materials, affecting the integrity of the carbon fiber composite, and can also lead to stress concentration at the joint, making it more prone to fracture, and may also result in thread loosening and failure.

[0004] Meanwhile, in practical applications, connections often involve "irregular structures + dissimilar surfaces + dissimilar materials," such as the "I"-shaped structure on the fixing structure of a liquid hydrogen storage tank in an aircraft. The liquid hydrogen storage tank is fixed by carbon fiber plates of the same material, while the carbon fiber arc plate is installed on a metal bracket. Its outer surface and the metal support column are connected by dissimilar surfaces and dissimilar materials. At the same time, in order to fit the liquid hydrogen storage tank, the fixing structure is often designed to be arc-shaped. In this case, the above-mentioned connection methods become more complex and the connection effect is poor. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a method for manufacturing a connection joint between a carbon fiber fixed arc plate and a metal support for a hydrogen storage cylinder. This method is applicable to the connection of irregularly shaped carbon fiber composite materials and metal materials, while overcoming the defects of traditional connections and ensuring the strength of the connection joint.

[0006] Technical solution: To achieve the above objectives, this invention discloses a method for manufacturing a connection joint between a carbon fiber fixing arc plate and a metal support column of a hydrogen storage cylinder, comprising the following steps:

[0007] (1) Based on the structure and size of the carbon fiber composite plate and the metal column to be connected, the size, curvature, layup method and micro-column structure on the surface of the metal column are designed to obtain the two-dimensional and three-dimensional models of the overall structure.

[0008] (2) The obtained model is simulated and tested to optimize the carbon fiber and resin materials, composite material layup method and micro-column structure on the surface of metal support for the connection joint, so as to obtain the final manufacturing parameters of the joint.

[0009] First, a model of the designed connection joint will be established based on the hydrogen storage cylinder. The ply angles of the composite material will be set according to the three commonly used ply angle groups: [0 / 90], [0 / 45 / -45 / 90], and [45 / -45]. The [0 / 90] and [45 / -45] groups will be set as four ply groups, and the [0 / 45 / -45 / 90] group will be set as two ply groups. Maximum load simulation analysis will be performed. The simulation results show that the [45 / -45] ply group has the largest maximum load.

[0010] Based on the above ply model and the maximum load of each group, fatigue simulation analysis was performed on the models of each angle group under 75% maximum load, 55% maximum load, 45% maximum load, and 35% maximum load. The simulation results show that under the condition of 75% maximum load, the fatigue life of the [0 / 45 / -45 / 90] group is the longest, and the fatigue life of the [45 / -45] group is the longest in the other cases. In order to enhance the strength of the joint along the 0° direction and the fatigue life under high load, the ply angle of the connection joint was finally designed to be [45 / 0 / -45] as a group for plying.

[0011] Based on the selected ply angle group [45 / 0 / -45], simulations were performed for various ply numbers. The designed connection joint model was established according to the hydrogen storage cylinder. The ply angle [45 / 0 / -45] was used as a group, and the number of ply numbers was set to 4, 6, and 8 groups respectively. Bending simulations were performed. The results showed that the fewer the number of ply numbers, the stronger the elasticity of the sample. Therefore, the upper surface of the connection joint was designed with 4 ply numbers, that is, the part connected with the arc-shaped carbon fiber composite plate. The remaining part of the connection joint was designed with 6 ply numbers.

[0012] (3) Based on the obtained model, complete the manufacturing of the micro-column structure on the surface of the metal pillar and the manufacturing of the corresponding fixtures required for the layup;

[0013] The required components of the connector fixture can be manufactured by additive manufacturing, which reduces material waste in the production of the connector fixture and improves the production efficiency of the connector fixture. The required components of the connector fixture can be made of resin materials to improve the production economy of the connector fixture.

[0014] At the same time, based on the parameters obtained in step (2), the required micro-column structure will be manufactured on the surface of the metal pillar connected to the carbon fiber composite plate by machining, such as metal additive manufacturing technology.

[0015] (4) Use automatic tape laying or automatic wire laying technology to lay up the designed connectors;

[0016] The connector consists of a U-shaped carbon fiber structure and two C-shaped carbon fiber structures. The interior of the U-shaped carbon fiber structure is first cured and connected to the metal support, and the bottom is then cured and connected to the carbon fiber composite plate through a secondary layup. The two C-shaped carbon fiber structures are laid up in a C-shape along the surface of the U-shaped carbon fiber structure, the carbon fiber composite plate, and the metal support. The empty spaces between the U-shaped carbon fiber structure and the two C-shaped carbon fiber structures are filled with filler made of carbon fiber prepreg.

[0017] In step (1), the width of the connecting joint is the same as the width of the carbon fiber composite plate and the metal support being connected.

[0018] Preferably, the curvature of the upper surface of the connector designed in step (1) is the same as the curvature of the carbon fiber composite plate to be connected, and the lower surface of the connector is a plane with the same length as the metal support to be connected.

[0019] Furthermore, the layup method of the connection joint designed in step (1) is multi-directional layup.

[0020] Furthermore, the micro-column structure on the surface of the metal support designed in step (1) has a cylindrical shape and is uniformly arranged in a rectangular array.

[0021] Preferably, in step (2), TC1320CF / PEEK carbon fiber prepreg is selected as the material for the carbon fiber composite plate during simulation.

[0022] Furthermore, in step (3), the connector clamp includes a longitudinal fixed end, a longitudinal lead screw, a longitudinal movable end passing through the longitudinal lead screw, a transverse fixed end, a transverse lead screw, and a transverse movable end passing through the transverse lead screw. The clamping surfaces of the longitudinal fixed end, the longitudinal movable end, the transverse fixed end, and the transverse movable end are configured to be adapted to the shape of the clamped part.

[0023] Furthermore, the U-shaped carbon fiber structure in step (4) is integrally laid up from TC1320CF / PEEK composite material. Using automatic fiber placement technology, a U-shaped layup is performed along the surface of the metal pillar. To improve the connection strength of the joint, the fiber direction is grouped into 6 groups in the [45 / 0 / -45] direction. After curing, according to the arc designed in step 1, 4 groups of layup are performed in the [45 / 0 / -45] direction as a group. After laying up the required arc, it is then connected to the carbon fiber composite material plate through secondary curing.

[0024] Preferably, the C-shaped carbon fiber structure in step (4) is integrally laid up from TC1320CF / PEEK composite material. Using automatic tape laying technology, C-shaped lay-up is performed along the surface of the U-shaped carbon fiber structure, the carbon fiber composite plate, and the metal pillar. The fiber direction is divided into groups of [45 / 0 / -45], and 6 groups of lay-up are performed. When laying up along the carbon fiber composite plate, the lay-up curvature is the same as the curvature of the carbon fiber composite plate.

[0025] Furthermore, the filler in step (4) is made of TC1320CF / PEEK composite prepreg, with the fiber direction connected to the length direction of the carbon fiber composite plate.

[0026] Beneficial Effects: Compared with the prior art, the present invention has the following significant advantages: The present invention ensures the connection strength of the joint through the structure of the connecting joint and the addition of a cylindrical geometry to the metal support; the present invention expands the range of connection strength by increasing the number of lay-ups and the microstructure of the metal support surface to meet the requirements of high connection strength; the manufacturing parameters of the connecting joint designed in the present invention have been simulated and experimentally verified, reducing the time, material and human resources wasted in preparing prototypes due to inaccurate manufacturing parameters; the present invention can use additive manufacturing to manufacture the fixtures required for the connecting joint, which reduces costs and protects the environment. On the other hand, the flexibility of additive manufacturing also ensures the flexibility of fixture design, allowing for diverse rib designs to fit the actual geometric dimensions of the connected parts; the U-shaped carbon fiber structure and C-shaped carbon fiber structure used in the connecting joint of the present invention further improve strength; and the present invention expands the connection methods for non-planar and non-circular structural connections between composite materials and metal materials. Attached Figure Description

[0027] Figure 1 This is a flowchart of the manufacturing method of the connector of the present invention;

[0028] Figure 2 This is a schematic diagram of a connecting joint of the present invention that is suitable for an "I"-shaped support structure;

[0029] Figure 3 This is a front view of the connector of the present invention;

[0030] Figure 4 This is a schematic diagram showing the layup direction of the connector of the present invention along multiple directions;

[0031] Figure 5 This is a schematic diagram of the micro-columnar structure on the surface of the titanium alloy support column of the connector of the present invention;

[0032] Figure 6 This is a simulation result diagram of the maximum load during the simulation analysis in this invention;

[0033] Figure 7 The figure shows the simulation results of fatigue simulation analysis in this invention;

[0034] Figure 8 This is a simulation result diagram of the number of layup layers in this invention;

[0035] Figure 9 A schematic diagram of the fixture required to manufacture the connector of this invention;

[0036] Figure 10 This is a schematic diagram of the connection state of the "I"-shaped support structure of the connector of the present invention. Detailed Implementation

[0037] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0038] like Figure 1 , Figure 2 and Figure 10 As shown, this invention discloses a method for manufacturing a connection joint between a carbon fiber fixing arc plate and a metal support column of a hydrogen storage cylinder, comprising the following steps:

[0039] S1. Based on the structure and dimensions of the carbon fiber composite plate 1 and the metal support 3 to be connected, the dimensions, curvature, layup method of the connecting joint 2 and the micro-column structure on the surface of the metal support are designed to obtain the two-dimensional and three-dimensional models of the overall structure.

[0040] The width of the designed connecting joint is the same as the width of the carbon fiber composite plate and the metal support being connected, so as to improve the connection strength of the joint and ensure the ease of manufacturing the joint. For a standard 60L hydrogen storage cylinder, the width can be designed to be 150mm.

[0041] The designed connector has an upper surface curvature that matches the curvature of the carbon fiber composite plate being connected, ensuring the connection strength between the connector and the carbon fiber composite plate. Simultaneously, the lower surface of the connector is a plane with the same length as the metal support being connected, further ensuring the connection strength between the connector and the metal support. For a standard 60L hydrogen storage cylinder, the arc shape can be designed as a partial arc with a radius of 154mm and an angle of 90°. The connector designed in this invention can achieve connections in complex situations involving "irregular structures, different surfaces, and dissimilar materials." Specifically, the surface curvature of the connector in contact with the surface of the irregular structure can be designed to match the surface curvature of the connected irregular structure to increase the connection area and improve the connection strength.

[0042] The designed connection joint uses a multi-directional layup to provide strength in the lateral direction and prevent the connection joint from breaking in the lateral direction;

[0043] The designed micro-columnar structures on the surface of the metal support pillar will be designed with a cylindrical shape and uniformly arranged in a rectangular array to enhance the connection strength of the joint. The connection joint designed in this invention can enhance the connection strength of the joint by adding a cylindrical geometry and a uniformly arranged rectangular array of microstructures to the metal support pillar without compromising the integrity of the connected parts, and achieving a strengthening effect by adding additional connection parts.

[0044] like Figure 5 As shown, the micro-column structure on the surface of the designed metal support 3 is a cylindrical structure 3-1, which is evenly arranged in a rectangular array to enhance the connection strength of the connecting joint; for a standard 60L hydrogen storage cylinder, it is designed as a 20×30 array, in which the dimensions of a single micro-column structure are: diameter 0.1mm and height 1mm;

[0045] S2. The obtained model is subjected to simulation analysis and experimental verification. The carbon fiber and resin materials used in the connection joint, the layup method of the composite material, and the micro-columnar structure on the surface of the metal support are optimized to obtain the final manufacturing parameters of the joint.

[0046] Thermoplastic resin polyetheretherketone (PEEK) possesses high heat resistance, environmental resistance, excellent impact resistance, fatigue resistance, creep resistance, corrosion resistance, radiation resistance, flame retardancy, good electrical insulation, high long-term operating temperature, and excellent resistance to various media. It can adapt well to most complex application scenarios while ensuring the connection strength of the joints. Therefore, TC1320CF / PEEK carbon fiber prepreg was selected as the material for the carbon fiber composite plate in the simulation.

[0047] like Figure 6As shown, the designed connection joint model will first be established based on a standard 60L hydrogen storage cylinder. The ply angles of the composite material will be set according to the commonly used [0 / 90], [0 / 45 / -45 / 90], and [45 / -45] ply angle groups. The [0 / 90] and [45 / -45] groups will be set as 4 ply groups, and the [0 / 45 / -45 / 90] group will be set as 2 ply groups. Maximum load simulation analysis will be performed. The results show that the [45 / -45] ply group has the largest maximum load.

[0048] like Figure 7 As shown, based on the above ply model and the maximum load of each group, fatigue simulation analysis was performed on the models of each angle group under 75% maximum load, 55% maximum load, 45% maximum load, and 35% maximum load, respectively. The results show that under the condition of 75% maximum load, the fatigue life of the [0 / 45 / -45 / 90] group is the longest, and the fatigue life of the [45 / -45] group is the longest in the other cases. In order to enhance the strength of the joint along the 0° direction and the fatigue life under high load, the ply angle of the connection joint was finally designed to be [45 / 0 / -45] as a group for plying.

[0049] like Figure 8 As shown, simulations were performed on various ply numbers based on the selected ply angle group [45 / 0 / -45]. The designed connection joint model was established according to a standard 60L hydrogen storage bottle. The ply angle [45 / 0 / -45] was used as a group, and the number of ply numbers was set to 4, 6, and 8 groups respectively. Bending simulations were also performed. The results showed that the fewer the number of ply numbers, the stronger the elasticity of the sample. Therefore, the upper surface of the connection joint was designed with 4 ply numbers, i.e., the part connected to the arc-shaped carbon fiber composite plate, and the remaining part of the connection joint was designed with 6 ply numbers.

[0050] The connector designed in this invention can adapt to different connection strength requirements by simply adjusting the ply parameters and the microstructure of the metal support surface. When the strength requirement is low, production costs can be reduced and production efficiency improved by decreasing the number of ply layers and the microstructure of the metal support surface. Conversely, high connection strength requirements can be achieved by increasing the number of ply layers and the microstructure of the metal support surface, thus expanding the range of connection strengths of the connector. The manufacturing parameters of the connector designed in this invention have been simulated and experimentally verified, reducing the time, material, and human resource waste required for preparing prototypes due to inaccurate manufacturing parameters.

[0051] S3. Based on the obtained model, complete the manufacturing of the micro-columnar structure on the surface of the metal pillar and the manufacturing of the corresponding fixtures required for the layup;

[0052] like Figure 9As shown, the connector clamp is designed with movable clamping ends in the transverse and longitudinal directions to adapt to the needs of various sizes of connected parts. At the same time, the fixed end and movable end in the longitudinal direction can be designed with different shapes to meet the needs of different surfaces of connected parts. The connector clamp 4 includes a longitudinal fixed end 4-1, a longitudinal lead screw, a longitudinal movable end 4-3 passing through the longitudinal lead screw, a transverse fixed end 4-2, a transverse lead screw, and a transverse movable end 4-4 passing through the transverse lead screw. The clamping surfaces of the longitudinal fixed end, the longitudinal movable end, the transverse fixed end, and the transverse movable end are set to be adapted to the shape of the clamped part.

[0053] The required components of the connector fixture can be manufactured by additive manufacturing, which reduces material waste in the production of the connector fixture and improves the production efficiency of the connector fixture. The required components of the connector fixture can be made of resin materials to improve the production economy of the connector fixture.

[0054] Simultaneously, based on the parameters obtained in step S2, the required micro-column structure will be manufactured on the surface of the metal support connected to the carbon fiber composite plate by machining, such as metal additive manufacturing technology. The micro-column structure is designed as a micro-column rectangular array evenly distributed on the surface of the metal support. Its array parameters are determined according to the geometric dimensions of the connected parts and the required connection strength of the joint. A single micro-column can be designed as a cylinder with a diameter of 0.1 mm and a length of 1 mm.

[0055] The present invention can use additive manufacturing to manufacture the fixtures required for the connection joints. On the one hand, it can reduce the material loss generated during the manufacture of fixtures and enable production with higher efficiency, thereby reducing costs and protecting the environment. On the other hand, the flexibility of additive manufacturing also ensures the flexibility of fixture design, allowing for diverse rib designs to fit the actual geometric dimensions of the connected parts.

[0056] This invention uses machining techniques such as metal additive manufacturing when manufacturing micro-columnar structures on the surface of metal pillars. On the one hand, it can reduce material waste and improve economic efficiency and environmental protection. On the other hand, the metal additive manufacturing method can accurately realize the manufacturing of microstructures of arbitrary shapes without producing complex microstructures during the production of metal pillars, thus improving the overall production efficiency. At the same time, the flexibility of the metal additive manufacturing method allows for flexible design of joints based on microstructures.

[0057] S4. Use automatic tape laying or automatic wire laying technology to perform layer-by-layer connection of the designed connector;

[0058] When performing layup connections, the prepreg material is generally TC1320CF / PEEK carbon fiber prepreg. Thermoplastic resin polyether ether ketone (PEEK) has the characteristics of high heat resistance, environmental resistance, excellent impact resistance, fatigue resistance, creep resistance, corrosion resistance, radiation resistance, flame retardancy, good electrical insulation, high long-term operating temperature, and excellent resistance to media. It can adapt well to most complex application scenarios while ensuring the connection strength of the joint.

[0059] like Figure 3 and Figure 4 As shown, the connecting joint 2 consists of a U-shaped carbon fiber structure 2-1, a left-side C-shaped carbon fiber structure 2-2, and a right-side C-shaped carbon fiber structure 2-3. The interior of the U-shaped carbon fiber structure is first cured and connected to the metal pillar, and the bottom is then cured and connected to the carbon fiber composite plate through a secondary layup. The two C-shaped carbon fiber structures are laid up in a C-shape along the surface of the U-shaped carbon fiber structure, the carbon fiber composite plate, and the metal pillar. The empty space between the U-shaped carbon fiber structure and the two C-shaped carbon fiber structures is filled with filler 2-4 made of carbon fiber prepreg.

[0060] like Figure 3 As shown, the U-shaped carbon fiber structure is integrally laid up from TC1320CF / PEEK composite material. Utilizing automated fiber placement technology, a U-shaped layup is performed along the surface of the metal support. To improve the connection strength of the joints, the fiber directions are grouped in the [45 / 0 / -45] direction (e.g., ...). Figure 4 Ⅰ), lay up 6 groups; after curing, lay up 4 groups according to the arc designed in step S1, with the fiber direction as a group in the [45 / 0 / -45] direction, lay up the required arc and then perform secondary curing and connection with the carbon fiber composite board; the process parameters required for automatic fiber placement technology are set as follows: heating temperature: 405℃, fixed laying speed: 5mm / s, laying pressure: 250N;

[0061] like Figure 3 As shown, the C-shaped carbon fiber structure is integrally laid up from TC1320CF / PEEK composite material. Utilizing automated tape laying technology, a C-shaped layup is performed along the surface of the U-shaped carbon fiber structure, carbon fiber composite plate, and metal support column. The fiber directions are grouped in the [45 / 0 / -45] direction (e.g., ...). Figure 4 (II) Perform 6 sets of lay-up; when laying up along the carbon fiber composite plate, the lay-up curvature is the same as the curvature of the carbon fiber composite plate; the process parameters required for automatic fiber placement technology are set as follows: heating temperature: 405℃, fixed lay-up speed: 4mm / s, lay-up pressure: 250N;

[0062] The filler is made of TC1320CF / PEEK composite prepreg, with the fiber direction connected to the length direction of the carbon fiber composite plate.

[0063] like Figure 10 After the connection joint between the carbon fiber composite plate and the metal support column is manufactured, a working drawing is provided for the support structure suitable for hydrogen storage cylinders.

[0064] This invention employs a lay-up technique in the manufacturing of the connection between carbon fiber composite panels and metal supports. The resulting joint structure has strength comparable to that of ordinary carbon fiber composite panels and superior to conventional adhesive connections. Lay-up joints are less prone to adhesive aging and deformation compared to adhesives, and are less affected by environmental factors. Furthermore, the lay-up technique ensures the integrity of the joint and the connected components, preventing damage to the connected components and avoiding stress concentration compared to bolted or riveted connections. This lay-up technique overcomes the shortcomings of traditional carbon fiber composite material-metal material connections.

[0065] The U-shaped and C-shaped carbon fiber structures used in the connectors of this invention are laid up in multiple groups, with the length direction as 0° and the [45 / 0 / -45] direction as a group. This improves the transverse strength of the U-shaped and C-shaped carbon fiber structures used in the connectors in the ±45° direction. Furthermore, the cross-layouts in each direction, grouped as [45 / 0 / -45], further enhance the transverse strength of the U-shaped and C-shaped carbon fiber structures used in the connectors in the ±45° direction.

[0066] The automated tape-laying technology uses prepreg tape of fixed widths, which is laid onto the mold surface or the previous layer via pressure rollers according to a planned path. This technology enables the convenient and rapid fabrication of large planar components or simple, low-curvature curved surfaces. Furthermore, it produces excellent molding results and allows for efficient and high-precision multi-directional lay-up of the C-shaped carbon fiber structure used in the connectors of this invention, facilitating mass production.

[0067] Automated fiber placement technology is similar to automated tape placement technology. It employs multiple independent prepreg bundles (also known as prepreg narrow tapes), each individually subjected to tensioning, clamping, shearing, and refeeding. After being bundled into a single prepreg tape of variable width in front of the pressure rollers, it is laid onto the mold surface or the previous layer according to a pre-planned path. Automated fiber placement technology can conveniently and quickly manufacture large, complex curved surface components and automatically adjust the fiber layup angle. Furthermore, it produces excellent forming results and can efficiently and precisely perform complex angle layups on the U-shaped carbon fiber structures used in the connectors of this invention in batches, which is beneficial for the mass production of this invention.

Claims

1. A method for manufacturing a connection joint between a carbon fiber fixing arc plate and a metal support column of a hydrogen storage cylinder, characterized in that, The steps include the following: (1) Based on the structure and size of the carbon fiber composite plate and the metal column to be connected, the size, curvature, layup method and micro-column structure on the surface of the metal column are designed to obtain the two-dimensional and three-dimensional models of the overall structure. (2) The obtained model is simulated and tested to optimize the carbon fiber and resin materials, composite material layup method and micro-column structure on the surface of metal support for the connection joint, so as to obtain the final manufacturing parameters of the joint. First, a model of the designed connection joint will be established based on the hydrogen storage cylinder. The ply angles of the composite material will be set according to the three commonly used ply angle groups: [0 / 90], [0 / 45 / -45 / 90], and [45 / -45]. The [0 / 90] and [45 / -45] groups will be set as four ply groups, and the [0 / 45 / -45 / 90] group will be set as two ply groups. Maximum load simulation analysis will be performed. The simulation results show that the [45 / -45] ply group has the largest maximum load. Based on the above ply model and the maximum load of each group, fatigue simulation analysis was performed on the models of each angle group under 75% maximum load, 55% maximum load, 45% maximum load, and 35% maximum load. The simulation results show that under the condition of 75% maximum load, the fatigue life of the [0 / 45 / -45 / 90] group is the longest, and the fatigue life of the [45 / -45] group is the longest in the other cases. In order to enhance the strength of the joint along the 0° direction and the fatigue life under high load, the ply angle of the connection joint was finally designed to be [45 / 0 / -45] as a group for plying. Based on the selected ply angle group [45 / 0 / -45], simulations were performed for various ply numbers. The designed connection joint model was established according to the hydrogen storage cylinder. The ply angle [45 / 0 / -45] was used as a group, and the number of ply numbers was set to 4, 6, and 8 groups respectively. Bending simulations were performed. The results showed that the fewer the number of ply numbers, the stronger the elasticity of the sample. Therefore, the upper surface of the connection joint was designed with 4 ply numbers, that is, the part connected with the arc-shaped carbon fiber composite plate. The remaining part of the connection joint was designed with 6 ply numbers. (3) Based on the obtained model, complete the manufacturing of the micro-column structure on the surface of the metal pillar and the manufacturing of the corresponding fixtures required for the layup; The required components of the connector fixture can be manufactured by additive manufacturing, which reduces material waste in the production of the connector fixture and improves the production efficiency of the connector fixture. The required components of the connector fixture can be made of resin materials to improve the production economy of the connector fixture. At the same time, based on the parameters obtained in step (2), the required micro-column structure will be manufactured on the surface of the metal pillar connected to the carbon fiber composite plate by machining, such as metal additive manufacturing technology. (4) Use automatic tape laying or automatic wire laying technology to lay up the designed connectors; The connector consists of a U-shaped carbon fiber structure and two C-shaped carbon fiber structures. The interior of the U-shaped carbon fiber structure is first cured and connected to the metal pillar, and the bottom is then cured and connected to the carbon fiber composite plate in a secondary layup. The two C-shaped carbon fiber structures are laid up in a C-shape along the surface of the U-shaped carbon fiber structure, the carbon fiber composite plate, and the metal pillar. The empty spaces between the U-shaped carbon fiber structure and the two C-shaped carbon fiber structures are filled with filler made of carbon fiber prepreg.

2. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support of a hydrogen storage cylinder according to claim 1, characterized in that: The width of the connecting joint designed in step (1) is the same as the width of the carbon fiber composite plate and the metal support being connected.

3. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support of a hydrogen storage cylinder according to claim 1, characterized in that: The curvature of the upper surface of the connector designed in step (1) is the same as the curvature of the carbon fiber composite plate being connected, and the lower surface of the connector is a plane with the same length as the metal support being connected.

4. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support column of the hydrogen storage cylinder according to claim 1, characterized in that: The layup method of the connection joint designed in step (1) is multi-directional layup.

5. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support of a hydrogen storage cylinder according to claim 1, characterized in that: The micro-column structure on the surface of the metal support designed in step (1) has a cylindrical shape and is uniformly arranged in a rectangular array.

6. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support column of the hydrogen storage cylinder according to claim 1, characterized in that: In step (2), TC1320CF / PEEK carbon fiber prepreg is selected as the material for the carbon fiber composite plate during simulation.

7. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support column of the hydrogen storage cylinder according to claim 1, characterized in that: In step (3), the connector clamp includes a longitudinal fixed end, a longitudinal lead screw, a longitudinal movable end passing through the longitudinal lead screw, a transverse fixed end, a transverse lead screw, and a transverse movable end passing through the transverse lead screw. The clamping surfaces of the longitudinal fixed end, the longitudinal movable end, the transverse fixed end, and the transverse movable end are configured to be adapted to the shape of the clamped part.

8. The manufacturing method of the connection joint between the carbon fiber fixing arc plate and the metal support column of the hydrogen storage cylinder according to claim 1, characterized in that: The U-shaped carbon fiber structure in step (4) is integrally laid up from TC1320CF / PEEK composite material. Using automatic fiber laying technology, U-shaped layup is carried out along the surface of the metal column. In order to improve the connection strength of the connection joint, the fiber direction is in the [45 / 0 / -45] direction as a group, and there are 6 groups of layup. After curing, according to the arc designed in step (1), four groups of layers are laid in the fiber direction as a group in the [45 / 0 / -45] direction. The required arc is laid out and then the carbon fiber composite material is cured and connected to it in a second time.

9. A method for manufacturing a connection joint between a carbon fiber fixing arc plate and a metal support column of a hydrogen storage cylinder according to claim 1, characterized in that: In step (4), the C-shaped carbon fiber structure is integrally laid up from TC1320CF / PEEK composite material. Using automatic tape laying technology, C-shaped lay-up is performed along the surface of the U-shaped carbon fiber structure, the carbon fiber composite plate, and the metal pillar. The fiber direction is divided into groups of [45 / 0 / -45], and 6 groups of lay-up are performed. When laying up along the carbon fiber composite plate, the lay-up curvature is the same as the curvature of the carbon fiber composite plate.

10. A method for manufacturing a connection joint between a carbon fiber fixing arc plate and a metal support column of a hydrogen storage cylinder according to claim 1, characterized in that: The filler in step (4) is made of TC1320CF / PEEK composite prepreg, and the fiber direction is connected to the length direction of the carbon fiber composite plate.

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