A ceramic octahedral platelet dot lattice structure

Abstract

A ceramic octahedral plate lattice structure includes an octahedral plate lattice structure and a truncated cell structure. The octahedral plate lattice structure includes a plate and an outer channel structure, the plate has a long side and a short side, the long side and the short side are staggered, a plurality of octahedral plate lattice structures are arranged in matrix and connected with each other through the outer channel structure, forming an octahedral plate, and there is no complex node at the connection, avoiding affecting the mechanical properties of the lattice material. The truncated cell structure is located at the connection of two plates and is arrayed and extended to the outer channel structures on both sides, the truncated cell structure is composed of four solid beams connected orthogonally, and the solid beams have a truncated structure of three faces. The arrayed truncated cell structure with a truncated structure has a higher strength-weight ratio and a high specific stiffness, while maximizing the use of materials and reducing the self-weight of the structure.

Description

Technical Field

[0001] This invention relates to the field of octahedral truss structure technology, and particularly to a ceramic octahedral flat plate lattice structure. Background Technology

[0002] In recent years, lattice materials have attracted widespread attention due to their superior mechanical properties. Compared with traditional materials, lattice materials possess characteristics such as lightweight, high specific stiffness, high specific strength, high energy absorption efficiency, controllable Poisson's ratio, and anisotropy inherent in their design. While meeting load-bearing requirements, they can also fulfill various functional needs, serving as structural support materials, energy-absorbing materials, noise reduction materials, thermal conductive materials, and biomaterials, with broad application prospects in aerospace, medicine, and transportation. In lattice materials, the geometrically complex nodes exist at the connections between members. The presence of nodes has a certain impact on the mechanical properties of lattice materials. For example, for body-centered cubic lattice materials, the node effect not only affects the relative density but also the load-bearing capacity. Among them, the octagonal lattice structure, as a classic tensile failure structure, plays an important role in structural support and energy absorption. In the traditional fabrication process of octagonal lattice materials, defects are easily formed at the nodes, and the presence of defects significantly affects the mechanical properties of the lattice material, such as elastic modulus, load-bearing capacity, energy absorption characteristics, and Poisson's ratio. Therefore, to improve material performance, a reasonable geometric configuration design is required for lattice materials. Existing octagonal lattice structures typically have circular nodes at the joints, and solid material is used to fill the spaces between the octagonal lattice structures to increase strength. However, the node effect not only affects the relative density of the material but also its load-bearing capacity. Furthermore, the solid filler material increases the structure's self-weight, which is detrimental to lightweight design. Summary of the Invention

[0003] In view of this, the present invention provides a ceramic octahedral flat plate lattice structure to solve the above-mentioned technical problems.

[0004] A ceramic octahedral plate lattice structure includes multiple octahedral plate lattice structures and multiple truncated cell structures. Each octahedral plate lattice structure comprises eight plates and six external channel structures. Each plate has six edges, including three long edges and three short edges, which are alternately connected. The long edges connect to adjacent plates, and the short edges connect to the external channel structures. The multiple octahedral plate lattice structures are arranged in a matrix and interconnected through the external channel structures. The truncated cell structures are located at the junctions of two plates and extend in an array to the external channel structures on both sides. Each truncated cell structure consists of four solid beams orthogonally connected at nodes, with one end of each beam interconnected and the other end forming a truncated structure with three faces.

[0005] Furthermore, after the eight plates are connected to each other, a plate-shaped octahedron can be formed, and the plate is triangular in shape.

[0006] Furthermore, the external channel structure is square, and the four corners of the square are provided with inclined surfaces.

[0007] Furthermore, the four inclined planes are used to set the truncated cell structure and simultaneously connect the sidewalls at the junction of the two flat plates.

[0008] Furthermore, both the flat plate and the outer channel structure have through holes at their centers that have the same shape as their own contours.

[0009] Furthermore, multiple octahedral planar lattice structures are arranged in a matrix and interconnected through the external channel structure.

[0010] Furthermore, the truncated structures of adjacent truncated cell structures are fitted together to splice them together.

[0011] Furthermore, the ratio of the length to the radius of the solid beam is 0.3 to 0.9, and the cross-section of the solid beam is preferably circular with a radius of 0.1 to 0.8 mm.

[0012] Compared with existing technologies, the ceramic octahedral flat plate lattice structure provided by this invention has a hexagonal structure with three long sides and three short sides. The long and short sides are staggered, making the shape of the plate triangular and thus more stable. Eight plates are connected to form a flat octahedron. The flat octahedron avoids geometrically complex nodes at the connection points, preventing any impact on the mechanical properties of the lattice material, improving stability, and effectively increasing the material's fracture toughness under large strain. Its Poisson's ratio still fluctuates around the set value, thus enhancing the structural strength and rigidity of the material and providing excellent mechanical properties. The truncated cell structure is located at the connection point of two plates and extends in an array to the external channel structure on both sides. The truncated cell structure consists of four solid beams orthogonally connected at the nodes. One end of each solid beam is connected to the others, and the other end is a truncated structure with three faces. The array of truncated cell structures with truncated features achieves a higher strength-to-weight ratio and higher specific stiffness, while maximizing material utilization and reducing the structure's self-weight. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a ceramic octahedral flat plate lattice structure provided by the present invention.

[0014] Figure 2 for Figure 1A schematic diagram of the octahedral planar lattice structure of the ceramic octahedral planar lattice structure.

[0015] Figure 3 for Figure 1 A schematic diagram of the truncated cell structure of the ceramic octahedral flat plate lattice structure. Detailed Implementation

[0016] The following provides a more detailed description of specific embodiments of the present invention. It should be understood that the description of the embodiments of the present invention herein is not intended to limit the scope of protection of the present invention.

[0017] like Figures 1 to 3 The diagram shown is a schematic representation of a ceramic octahedral flat plate lattice structure provided by the present invention. The ceramic octahedral flat plate lattice structure includes multiple octahedral flat plate lattice structures 10 and multiple truncated cell structures 20. It is conceivable that the ceramic octahedral flat plate lattice structure also includes other functional structures, which are techniques well known to those skilled in the art and will not be described in detail here.

[0018] The octahedral planar lattice structure 10 includes eight planar plates 11 and six external channel structures 12.

[0019] The plate 11 has six edges, including three long edges 111 and three short edges 112. The long edges 111 and the short edges 112 are staggered, giving the plate 11 a triangular shape with higher stability. The long edges 111 are used to connect with adjacent plates 11, and the short edges 112 are used to connect with the outer channel structure 12. After eight plates 11 are connected to each other, a plate-shaped octahedron is formed. Since it is a plate-shaped octahedron, there are no geometrically complex nodes at the connection points, avoiding any impact on the mechanical properties of the lattice material, improving stability, and effectively transmitting force in different directions, providing excellent mechanical properties. The outer channel structure 12 is square, and the four corners of the square are provided with inclined surfaces 121. The four inclined surfaces 121 are used to set the truncated cell structure 20, and at the same time connect the sidewalls at the connection points of two plates 11, thereby connecting the six vertices of the octahedron. Both the flat plate 11 and the external channel structure 12 have through holes at their centers that have the same shape as their own contours, thereby connecting with the internal space and reducing the structure's weight. Multiple octahedral flat plate lattice structures 10 are arranged in a matrix and interconnected through the external channel structure 12, thus forming a whole.

[0020] The truncated cell structure 20 is located at the connection of the two flat plates 11 and extends in an array to the external channel structure 12 on both sides. The truncated cell structure 20 is composed of four solid beams 21 orthogonally connected at the nodes. One end of each solid beam 21 is interconnected, and the other end is a truncated structure 22 with three faces. The truncated structures 22 of adjacent truncated cell structures 20 are fitted together to form a spliced ​​connection. The length-to-radius ratio of the solid beam 21 is 0.3 to 0.9, and the cross-section of the solid beam 21 is preferably circular with a radius of 0.1 to 0.8 mm. Compared with the solid filling in the prior art, by setting the truncated cell structure 20 with truncated structures in a lattice configuration, a higher strength-to-weight ratio and higher specific stiffness can be achieved. At the same time, the material is utilized to the maximum extent, reducing the self-weight of the structure, thus laying a good foundation for high specific stiffness, high specific strength, and lightweight design.

[0021] The ceramic octahedral flat lattice structure is integrally formed. However, existing manufacturing techniques struggle to form octahedral truss structures in a single step, resulting in low forming accuracy and high manufacturing costs. Therefore, this invention also provides a manufacturing method based on DLP (Digital Light Processing), which primarily utilizes interlayer curing and stacking, offering advantages such as large format and high precision. This method includes the following steps: Step 1: Draw the ceramic octahedral flat plate lattice structure in 3D drawing software, and then export the STL file.

[0022] Step 2: Import the STL file into industrial slicing software for model slicing processing. The slice layer thickness is 40. Then export the slice file that can be recognized by the photopolymer 3D printer. Step 3: Import the slice file from Step 2 into the printer and set the exposure time to 2 seconds, the interlayer exposure intensity to 12mW / cm, and the interlayer exposure time to 5 seconds for curing and printing; Step 4: After printing is complete, remove the printed sample from the stencil and clean it with an alcohol spray gun. After cleaning, you will get the desired green body. The cleaned sample should be stored in resin.

[0023] Step 5: The printed ceramic truncated octahedral flat plate lattice structure green body is first degreased to 550°C in a muffle furnace, and then sintered to 1150°C in a muffle furnace to obtain a dense, defect-free ceramic octahedral flat plate lattice structure.

[0024] Compared with the prior art, the ceramic octahedral flat plate lattice structure provided by the present invention has a hexagonal plate 11 with three long sides 111 and three short sides 112. The long sides 111 and the short sides 112 are staggered, so that the shape of the plate 11 is triangular and has higher stability. After eight plates 11 are connected to each other, a flat octahedron is formed. The flat octahedron does not have nodes with complex geometric configurations at the connection points, avoiding certain impacts on the mechanical properties of the lattice material, improving stability, effectively increasing the fracture toughness of the material under large strain, and its Poisson's ratio still fluctuates around the set value, that is, enhancing the structural strength and rigidity of the material and providing excellent mechanical properties. The truncated cell structure 20 is located at the connection point of two plates 11 and extends in an array to the external channel structure 12 on both sides. The truncated cell structure 20 is composed of four solid beams 21 orthogonally connected at the nodes. One end of the solid beams 21 is connected to each other, and the other end is a truncated structure 22 with three faces. The array configuration of the truncated cell structure 20 with a truncated structure can achieve a higher strength-to-weight ratio and high specific stiffness, while maximizing material utilization and reducing the structure's self-weight.

[0025] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions or improvements within the spirit of the present invention are covered within the scope of the claims of the present invention.

Claims

1. A ceramic octahedral flat plate lattice structure, characterized in that: The ceramic octahedral plate lattice structure includes multiple octahedral plate lattice structures and multiple truncated cell structures. Each octahedral plate lattice structure includes eight plates and six external channel structures. Each plate has six edges, including three long edges and three short edges. The long edges and short edges are staggered and connected. The long edges are used to connect with adjacent plates, and the short edges are used to connect with the external channel structures. The multiple octahedral plate lattice structures are arranged in a matrix and interconnected through the external channel structures. The truncated cell structures are located at the connection between two plates and are distributed in an array extending to the external channel structures on both sides. Each truncated cell structure is composed of four solid beams orthogonally connected at nodes. One end of each solid beam is interconnected, and the other end is a truncated structure with three faces.

2. The ceramic octahedral flat plate lattice structure as described in claim 1, characterized in that: Eight flat plates can be connected to form a flat octahedron.

3. The ceramic octahedral flat plate lattice structure as described in claim 1, characterized in that: The external channel structure is square, and the four corners of the square are provided with bevels.

4. The ceramic octahedral flat plate lattice structure as described in claim 3, characterized in that: The four inclined planes are used to set the truncated cell structure and connect the sidewalls at the junction of the two flat plates.

5. The ceramic octahedral flat plate lattice structure as described in claim 1, characterized in that: Both the flat plate and the external channel structure have through holes at their centers that have the same shape as their own contours.

6. The ceramic octahedral flat plate lattice structure as described in claim 1, characterized in that: The truncated structures of adjacent truncated cell structures fit together to form a spliced ​​connection.

7. The ceramic octahedral flat plate lattice structure as described in claim 1, characterized in that: The ratio of the length to the radius of the solid beam is 0.3 to 0.9, and the cross-section of the solid beam is circular with a radius of 0.1 to 0.8 mm.

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