A design method for enhancing the toughness of lightweight spatially stacked load-bearing structures

Abstract

The present invention discloses a method for designing a lightweight space-stacked load-bearing structure with enhanced toughness. Input the design requirements of the space-stacked load-bearing structure, determine the force magnitude and direction of the space-stacked load-bearing structure, the panel size, and the size of the bottom surface inclusion surface of the sandwich layer cells; determine the nesting type of the load-bearing sandwich layer cells according to the force magnitude and direction of the space-stacked load-bearing structure; determine the arrangement mode of the sandwich layer cells of the space-stacked load-bearing structure of N-1 type cells according to the size of the bottom surface inclusion surface and the panel size; select and calculate the position coordinates of the feature points according to the nesting type and arrangement mode of the cells, determine the cell type, and establish a space-stacked load-bearing structure superposition model of N-1 type cells. The method proposed in the present invention is a design method for a space-stacked load-bearing structure of N-1 type cells, which solves the problem that the unreasonable arrangement of the top plate and the bottom plate of the space-stacked load-bearing structure of N-1 type cells leads to the non-superposition of N-1 type cells in the sandwich layer space.

Description

Technical Field

[0001] The present invention relates to a mechanical product panel structure and design method, and more particularly to a design method for a lightweight spatially stacked load-bearing structure with enhanced toughness. Background Art

[0002] Load-bearing structures based on spatial stacking are widely used in fields such as high-speed rail, aircraft, wind power, and automated warehousing systems. The spatial stacking structure is a functional structure that integrates physical structure and performance, consisting of panels, a core, and a connecting adhesive layer. The core adopts cellular spatial stacking, and the spatial stacking form of the cells is related to the performance of the load-bearing structure. It can exert its advantages such as high specific strength and large specific modulus, and can simultaneously meet extreme service performance requirements such as high strength, high stiffness, and light weight, and realize special functional requirements such as heat dissipation, vibration isolation, and electronic shielding. It has important applications in aerospace, ships, high-speed trains, armor protection, and other fields. It is a key structure for major equipment products such as aerospace vehicles, high-speed rail vehicles, and high-performance CNC machine tools to achieve large-scale structures, light weight, and extreme working conditions.

[0003] Load-bearing structures based on spatially stacked cells are a class of composite structures with exceptional performance. Their physical and mechanical properties are not only related to the specific structural dimensions of the individual cells, but also to their arrangement on the upper and lower plates. Therefore, the design and research of different types of cellular composite structures is particularly important. Currently, there is a lack of systematic design methods for spatially stacked load-bearing structures that specifically address the specific cellular stacking scheme. There is little methodological support for the spatial stacking of cells, a crucial aspect of load-bearing structures.

[0004] Patent application number 201810638181.9 discloses a method for designing N-1-type cells for a spatially stacked load-bearing structure. Based on the design requirements of the spatially stacked load-bearing structure, the arrangement of the panels and core cells of the spatially stacked load-bearing structure is determined to obtain the design constraints of the core cells. Based on the design constraints of the core cells, a two-dimensional unfolded geometric shape feature model of the cells in the core layer is constructed, and the three-dimensional formability coefficient and three-dimensional structural parameters of the two-dimensional unfolded geometric shape feature model of the cells in the core layer are calculated. However, the method does not study the design method of the cell arrangement method, making it difficult to provide theoretical guidance for the design method of the cell arrangement.

[0005] Patent application number 201710380638.6 discloses a load-bearing structure design method for spatially stacked irregular cells. By constructing an envelope of irregular cells and establishing a spatial superposition method tailored to their geometric characteristics, the method rationally designs and arranges various types of irregular cells in a sandwich-like composite structure while ensuring the proper density of the cells. However, the method for cellular arrangement is not discussed. Summary of the Invention

[0006] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a design method for a load-bearing structure of spatial stacking of N-1 type cells. Input the design requirements of the load-bearing structure of spatial stacking, determine the force magnitude and direction of the load-bearing structure of spatial stacking, the panel size, and the size of the bottom surface inclusion surface of the sandwich layer cells; determine the nesting type of the sandwich layer cells according to the force magnitude and direction of the load-bearing structure of spatial stacking; determine the arrangement of the sandwich layer cells of the load-bearing structure of spatial stacking of N-1 type cells according to the size of the bottom surface inclusion surface of the cells and the panel size; select and calculate the position coordinates of the feature points according to the nesting type and arrangement of the cells, determine the cell type, and establish a superposition model of the load-bearing structure of spatial stacking of N-1 type cells. The method proposed in the present invention solves the problem that the N-1 type cells cannot be superimposed in the sandwich layer space due to the unreasonable arrangement of the top plate and bottom plate of the load-bearing structure of spatial stacking of N-1 type cells.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a design method for enhancing the toughness of a lightweight space-stacked load-bearing structure, characterized in that it comprises the following steps:

[0008] Step 1: Input the design requirements of the spatial stacked load-bearing structure, determine the force magnitude and direction of the spatial stacked load-bearing structure, the panel size, and the size of the bottom surface of the sandwich layer cell;

[0009] Step 2: Determine the cell nesting type of the sandwich layer cells of the spatially stacked load-bearing structure of the N-1 type cells according to the force magnitude and direction of the spatially stacked load-bearing structure;

[0010] Step 3: Determine the cell arrangement of the sandwich layer cells of the load-bearing structure of the spatial stacking of N-1 type cells according to the size of the bottom surface of the sandwich layer cells and the size of the panel;

[0011] Step 4: Select the characteristic points of the sandwich layer of the spatially stacked load-bearing structure according to the nested type arrangement of the N-1 type cells;

[0012] Step 5: Calculate the coordinates of the characteristic points of the sandwich layer of the spatially stacked load-bearing structure ( );

[0013] Step 6: Select the type of sandwich layer cells for the spatially stacked load-bearing structure, establish a spatially stacked load-bearing structure superposition model of N-1 type cells, and implement the design of the load-bearing structure based on the established model.

[0014] As a further improvement of the present invention, the design requirements of the space stacking bearing structure in step 1 include the force magnitude of the space stacking bearing structure. , force direction , the panel size of the long side length a, the short side length b, the sandwich layer cell bottom surface area radius r;

[0015] The force direction It means defining the lower left point of the panel of the spatially stacked load-bearing structure as the coordinate origin, and defining the positive direction of the X-axis along the long side of the panel from the coordinate origin as the angle between the force direction and the positive direction of the X-axis.

[0016] As a further improvement of the present invention, the specific steps of determining the cell nesting type of the load-bearing sandwich layer cells of the spatially stacked N-1 type cells in step 2 are as follows:

[0017] Step 21: Determine the direction of force Is it equal to 0 or π? If so, it is determined to be a horizontal nesting type, otherwise proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is horizontally tangent, and its tangent point coincides with the center of the cell bottom surface containing surface in the other direction;

[0018] Step 22: Determine the direction of force Is it equal to π / 2? If so, it is determined to be a vertical nesting type. Otherwise, proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is vertically tangent, and its tangent point coincides with the center of the cell bottom surface containing surface in the other direction;

[0019] Steps 2 and 3: Determine the direction of force Is it equal to π / 4 or 3π / 4? If so, it is determined to be a diagonal nesting type. Otherwise, proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is tangent along the northwest direction or northeast direction, and the tangent point coincides with the center of the cell bottom surface containing surface in the other direction;

[0020] Step 24: If the force direction If it is not equal to 0, π, π / 2, π / 4 or 3π / 4, it is determined to be a triangular nesting type, specifically: for the cell bottom surface containing surface with radius r and The circle with a radius of r in the same direction is tangent to the bottom surface of the cell, and the center of the circle is located at the vertex of the regular triangle with a side length of 2r; the radius in the other direction is The center of the cell base containing surface is located at the center of the regular triangle with a side length of 2r.

[0021] As a further improvement of the present invention, the specific arrangement of the cells of the space-stacked load-bearing structure sandwich layer in step 3 is as follows:

[0022] Step 3.1: Determine the maximum number of arrangements n in the X-axis direction based on the panel size and the bottom surface size of the sandwich layer cell. The specific calculation formula is: ;

[0023] Step 32: According to the determined nesting type, determine the maximum number of arrangements m in the Y-axis direction. The specific calculation formula is: ;

[0024] Step 33: Select any panel as the base, define the lower left corner of the panel as the coordinate origin, define the long side of the panel as the X-axis and the short side as the Y-axis, start arranging from the point tangent to both the X-axis and the Y-axis, arrange n cells continuously along the positive direction of the X-axis, and arrange m cells continuously along the positive direction of the Y-axis according to the selected nesting method.

[0025] As a further improvement of the present invention, the N-1 type cell in step four is specifically a three-dimensional regular polyhedron with a regular N-gon at the bottom, an isosceles triangle with the side length of the N-gon as the base, and the side folded along the edge of the regular N-gon at the bottom.

[0026] As a further improvement of the present invention, the spatially stacked load-bearing structure in step 4 is a composite structure formed by arranging and stacking N-1 type cells on upper and lower panels in a certain nesting manner.

[0027] As a further improvement of the present invention, the characteristic point selection method of the sandwich layer of the spatially stacked load-bearing structure in step 4 is: placing the regular polygon upright and selecting the vertices of the N-1 type cells as its characteristic points.

[0028] As a further improvement of the present invention, the position coordinates of the characteristic points of the sandwich layer of the spatially stacked load-bearing structure in step 5 ( ) is calculated as follows:

[0029] Step 51: Place the N-1 type cell upright, with the lower left corner of the bottom plate or top plate as the coordinate origin, the long side of the top plate or bottom plate as the x-axis, the other perpendicular side as the y-axis, and the z-axis parallel to the height direction of the cell three-dimensional structure;

[0030] Step 52: For each upright cell, calculate the coordinates of the vertex farthest from the bottom surface ( ), where the subscript Represents the arrangement of the cell in the x-axis direction of the base plate. The following table Represents the arrangement of the cell in the y direction of the base plate;

[0031] Step 53, calculate the List x-axis coordinate of the row cell vertex , The corresponding x-axis coordinate is the center position of the circle of the bottom surface of the N-1 cell, as follows:

[0032] For the N-1 type cells arranged on the base plate:

[0033] ;

[0034] For the N-1 type cells arranged on the top plate:

[0035] ;

[0036] Step 54, calculate the List The y-axis coordinate of the row cell vertex , It corresponds to the y-axis coordinate of the center of the cell bottom surface, as follows:

[0037] For the N-1 cells arranged on the base plate:

[0038] ;

[0039] For the N-1 type cells arranged on the top plate:

[0040] ;

[0041] Step 55, calculate the List z-axis coordinate of the row cell vertex , It corresponds to the height of the three-dimensional structure of the cell.

[0042] The beneficial effects of the present invention are as follows: by inputting the design requirements of the spatially stacked load-bearing structure, the force magnitude and direction of the spatially stacked load-bearing structure, the panel size, and the bottom surface inclusion size of the sandwich layer cells are determined; according to the force magnitude and direction of the spatially stacked load-bearing structure, the sandwich layer cell nesting type is determined; according to the bottom surface inclusion size of the cells and the panel size, the arrangement of the sandwich layer cells of the spatially stacked load-bearing structure of N-1 type cells is determined; according to the nesting type and arrangement of the cells, the feature point position coordinates are selected and calculated, the cell type is determined, and a superposition model of the spatially stacked load-bearing structure of N-1 type cells is established. The method proposed by the present invention solves the problem that the N-1 type cells cannot be superimposed in the sandwich layer space due to the unreasonable arrangement of the top and bottom plates of the spatially stacked load-bearing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 Schematic diagram of the 3-1 type load-bearing structure based on cellular space stacking;

[0044] Figure 2Schematic diagram of the 3-1 type load-bearing structure base plate based on cellular space stacking;

[0045] Figure 3 Schematic diagram of the top plate of the 3-1 type load-bearing structure based on cellular space stacking;

[0046] Figure 4 Schematic diagram of the arrangement of horizontally nested cellular space stacks;

[0047] Figure 5 Schematic diagram of the arrangement of vertically nested cellular space stacks;

[0048] Figure 6 Schematic diagram of the arrangement of 127° diagonally nested cell space stacks;

[0049] Figure 7 Schematic diagram of the arrangement of 45° diagonally nested cell space stacks;

[0050] Figure 8 Schematic diagram of the arrangement of triangular nested cellular space stacking; DETAILED DESCRIPTION

[0051] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0052] Reference Figures 1 to 8 As shown, a lightweight space stacked load-bearing structure toughness enhancement design method of this embodiment is used to design a high-performance material with high lightness, high specific strength and large specific modulus, which is widely used in high-speed aircraft skins, rail transit vehicle shells, solar photovoltaic panels and other scenarios. In these application scenarios, there are without exception very high requirements for lightweighting. High-speed aircraft and rail transit vehicles have very high operating speeds, and lightweight designs can greatly reduce energy consumption. Solar photovoltaic panels are mostly arranged in vast hills, Gobi, wastelands and other areas, and are subjected to strong winds all year round, and the comparative strength requirements are very high. In addition, space stacking structures are also widely used in scenarios such as engineering machinery and heavy-duty machine tools, such as the top plate of a heavy hydraulic press (attached Figure 1 ), in order to prevent uneven load distribution, which causes structural deformation and affects working accuracy, lightweight design is required. At the same time, the stiffness and strength requirements are very high. Multi-layer space stacking can be designed according to different models for toughness design. In these application scenarios, the N-1 type cellular space stacking load-bearing structure involved in the present invention can perform very well. Especially under extreme working conditions, when there are higher requirements for lightweight, specific strength, etc., its performance can be improved by toughly stacking multiple layers. It is specifically achieved by the following steps:

[0053] Step 1: Input the design requirements of the spatial stacked load-bearing structure, determine the force magnitude and direction of the spatial stacked load-bearing structure, the panel size, and the size of the bottom surface of the sandwich layer cell;

[0054] Step 2: Determine the cell nesting type of the sandwich layer cells of the spatially stacked load-bearing structure of the N-1 type cells according to the force magnitude and direction of the spatially stacked load-bearing structure;

[0055] Step 3: Determine the cell arrangement of the sandwich layer cells of the load-bearing structure of the spatial stacking of N-1 type cells according to the size of the bottom surface of the sandwich layer cells and the size of the panel;

[0056] Step 4: Select the characteristic points of the sandwich layer of the spatially stacked load-bearing structure according to the nested type arrangement of the N-1 type cells;

[0057] Step 5: Calculate the coordinates of the characteristic points of the sandwich layer of the spatially stacked load-bearing structure ( );

[0058] Step 6: Select the type of sandwich layer cells for the spatially stacked load-bearing structure, establish a spatially stacked load-bearing structure superposition model of N-1 type cells, and implement the design of the load-bearing structure based on the established model.

[0059] Furthermore, in the above step 1, the design requirements of the space stacking bearing structure include the force magnitude of the space stacking bearing structure. , force direction , the panel size of the long side length a, the short side length b, the sandwich layer cell bottom surface area radius r;

[0060] The force direction It means defining the lower left point of the panel of the spatially stacked load-bearing structure as the coordinate origin, and defining the positive direction of the X-axis along the long side of the panel from the coordinate origin as the angle between the force direction and the positive direction of the X-axis.

[0061] Furthermore, in the above step 2, the specific steps for determining the cell nesting type of the load-bearing structure sandwich layer cells of the spatial stack of N-1 type cells are as follows:

[0062] Step 21: Determine the direction of force Is it equal to 0 or π? If so, it is determined to be a horizontal nesting type, otherwise proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is horizontally tangent, and its tangent point coincides with the center of the cell bottom surface containing surface in the other direction;

[0063] Step 22: Determine the direction of force Is it equal to π / 2? If so, it is determined to be a vertical nesting type. Otherwise, proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is vertically tangent, and its tangent point coincides with the center of the cell bottom surface containing surface in the other direction;

[0064] Steps 2 and 3: Determine the direction of force Is it equal to π / 4 or 3π / 4? If so, it is determined to be a diagonal nesting type. Otherwise, proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is tangent along the northwest direction or northeast direction, and the tangent point coincides with the center of the cell bottom surface containing surface in the other direction;

[0065] Step 24: If the force direction If it is not equal to 0, π, π / 2, π / 4 or 3π / 4, it is determined to be a triangular nesting type, specifically: for the cell bottom surface containing surface with radius r and The circle with a radius of r in the same direction is tangent to the bottom surface of the cell, and the center of the circle is located at the vertex of the regular triangle with a side length of 2r; the radius in the other direction is The center of the cell base containing surface is located at the center of the regular triangle with a side length of 2r.

[0066] Furthermore, in the above step 3, the specific arrangement of the cells of the stacked load-bearing structure sandwich layer cells is as follows:

[0067] Step 3.1: Determine the maximum number of arrangements n in the X-axis direction based on the panel size and the bottom surface size of the sandwich layer cell. The specific calculation formula is: ;

[0068] Step 32: According to the determined nesting type, determine the maximum number of arrangements m in the Y-axis direction. The specific calculation formula is: ;

[0069] Step 33: Select any panel as the base, define the lower left corner of the panel as the coordinate origin, define the long side of the panel as the X-axis and the short side as the Y-axis, start arranging from the point tangent to both the X-axis and the Y-axis, arrange n cells continuously along the positive direction of the X-axis, and arrange m cells continuously along the positive direction of the Y-axis according to the selected nesting method.

[0070] Furthermore, in the above step four, the N-1 type cell is specifically a three-dimensional regular polyhedron with a regular N-gon at the bottom, an isosceles triangle with the side length of the N-gon as the base, and the side folded along the edge of the regular N-gon at the bottom. The spatially stacked load-bearing structure is a composite structure formed by arranging and overlapping the N-1 type cells on the upper and lower panels in a certain nesting manner. The characteristic point selection method of the sandwich layer of the spatially stacked load-bearing structure is: place the regular polygon upright and select the vertices of the N-1 type cell as its characteristic point.

[0071] Furthermore, in the above step 5, the position coordinates of the characteristic points of the sandwich layer of the spatially stacked load-bearing structure ( ) is calculated as follows:

[0072] Step 51: Place the N-1 type cell upright, with the lower left corner of the bottom plate or top plate as the coordinate origin, the long side of the top plate or bottom plate as the x-axis, the other perpendicular side as the y-axis, and the z-axis parallel to the height direction of the cell three-dimensional structure;

[0073] Step 52: For each upright cell, calculate the coordinates of the vertex farthest from the bottom surface ( ), where the subscript Represents the arrangement of the cell in the x-axis direction of the base plate. The following table Represents the arrangement of the cell in the y direction of the base plate;

[0074] Step 53, calculate the List x-axis coordinate of the row cell vertex , The corresponding x-axis coordinate is the center position of the circle of the bottom surface of the N-1 cell, as follows:

[0075] For the N-1 cells arranged on the base plate:

[0076] ;

[0077] For the N-1 type cells arranged on the top plate:

[0078] ;

[0079] Step 54, calculate the List The y-axis coordinate of the row cell vertex , It corresponds to the y-axis coordinate of the center of the cell bottom surface, as follows:

[0080] For the N-1 cells arranged on the base plate:

[0081] ;

[0082] For the N-1 type cells arranged on the top plate:

[0083] ;

[0084] Step 55, calculate the List z-axis coordinate of the row cell vertex , It corresponds to the height of the three-dimensional structure of the cell. Taking a regular triangle as an example, .

[0085] The above steps standardize the design logic and rules of the load-bearing structure of the N-1 type cellular space stack, which facilitates the formation of a domain design knowledge base for the development of dedicated computer-aided design tools and software, and provides technical support for the corresponding domestic software development.

[0086] In this embodiment, the design of a load-bearing structure of a 3-1 type cellular space stack is taken as an example, and the details are as follows:

[0087] Through steps one to three, the arrangement rules of 3-1 type cells on the top and bottom surfaces, the arrangement rules of N-1 type cells on the top and bottom surfaces, and the arrangement rules of 3-1 type cells on the top and bottom surfaces are designed. Then, according to the design size of the two-dimensional geometric figure of the cells and the given arrangement rules, the coordinates of the spatial point position are calculated ( ).

[0088] According to the design idea of ​​the load-bearing structure of the above N-1 type cell space stacking, the three-dimensional geometric parameters of the 3-1 type cell that meet the three-dimensional formability conditions can be obtained: the side length of the bottom regular triangle is ,high , dihedral angle According to the bottom plate arrangement and top plate arrangement of the 3-1 type cell sandwich structure shown in the attached figure, the coordinate positions of the vertices of the 3-1 type cell are calculated:

[0089] baseplate

[0090] Calculate the List x-axis coordinates of the vertices of the 3-1 cell row , The corresponding x-axis coordinate is the midpoint of the regular triangle at the bottom of the 3-1 cell. ;

[0091] Calculate the List The y-axis coordinate of the vertex of the 3-1 cell , The corresponding y-axis coordinate is the midpoint of the regular triangle at the bottom of the 3-1 cell, and the calculation is ;

[0092] Calculate the List z-axis coordinates of the vertices of the 3-1 cell row , This corresponds to the high , calculated ;

[0093] The above calculation results are combined to get List Vertex coordinates of row 3-1 cells

[0094] roof

[0095] 2.1) Calculate the List x-axis coordinates of the vertices of the 3-1 cell row , The corresponding x-axis coordinate is the midpoint of the regular triangle at the bottom of the 3-1 cell. ;

[0096] 2.2) Calculate the List The y-axis coordinate of the vertex of the 3-1 cell , The corresponding y-axis coordinate is the midpoint of the regular triangle at the bottom of the 3-1 cell, and the calculation is ;

[0097] 2.3) Calculate the List z-axis coordinates of the vertices of the 3-1 cell row , This corresponds to the high , calculated ;

[0098] 2.4)Combining the above calculation results, we can get List Vertex coordinates of row 3-1 cells .

[0099] In summary, the design method for enhancing the toughness of a lightweight spatially stacked load-bearing structure of this embodiment inputs the design requirements of the spatially stacked load-bearing structure, determines the force magnitude and direction, panel size, and bottom surface inclusion size of the sandwich layer cells of the spatially stacked load-bearing structure; determines the nesting type of the sandwich layer cells according to the force magnitude and direction of the spatially stacked load-bearing structure; determines the arrangement of the sandwich layer cells of the spatially stacked load-bearing structure of N-1 type cells according to the bottom surface inclusion size of the cells and the panel size; selects and calculates the coordinates of the feature point position according to the nesting type and arrangement of the cells, determines the cell type, and establishes a superposition model of the spatially stacked load-bearing structure of N-1 type cells, thereby solving the problem that the N-1 type cells cannot be superimposed in the sandwich layer space due to the unreasonable arrangement of the top and bottom plates of the spatially stacked load-bearing structure.

[0100] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A design method for enhancing the toughness of a lightweight, space-stacked load-bearing structure, characterized by: The steps include: Step 1: Input the design requirements of the spatial stacked load-bearing structure, determine the force magnitude and direction of the spatial stacked load-bearing structure, the panel size, and the size of the bottom surface of the sandwich layer cell; Step 2: Determine the cell nesting type of the sandwich layer cells of the spatially stacked load-bearing structure of the N-1 type cells according to the force magnitude and direction of the spatially stacked load-bearing structure; Step 3: Determine the cell arrangement of the load-bearing structure sandwich layer cells of the spatial stacking of N-1 type cells according to the size of the bottom surface of the sandwich layer cells and the size of the panel; Step 4: Select the characteristic points of the sandwich layer of the spatially stacked load-bearing structure according to the nested type arrangement of the N-1 type cells; Step 5: Calculate the coordinates of the characteristic points of the sandwich layer of the spatially stacked load-bearing structure ( ); Step 6: Select the type of sandwich layer cells for the spatially stacked load-bearing structure, establish a spatially stacked load-bearing structure superposition model of N-1 type cells, and implement the design of the load-bearing structure based on the established model; The specific steps for determining the cell nesting type of the load-bearing structure sandwich layer cells of the spatial stack of N-1 type cells in step 2 are as follows: Step 21: Determine the direction of force Is it equal to 0 or π? If so, it is determined to be a horizontal nesting type, otherwise proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is horizontally tangent, and its tangent point coincides with the center of the cell bottom surface containing surface in the other direction; Step 22: Determine the direction of force Is it equal to π / 2? If so, it is determined to be a vertical nesting type. Otherwise, proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is vertically tangent, and its tangent point coincides with the center of the cell bottom surface containing surface in the other direction; Steps 2 and 3: Determine the direction of force Is it equal to π / 4 or 3π / 4? If so, it is determined to be a diagonal nesting type. Otherwise, proceed to the next step, specifically: for the cell bottom surface containing surface is a circle with a radius of r, the cell bottom surface containing surface in the same direction is tangent along the northwest direction or northeast direction, and the tangent point coincides with the center of the cell bottom surface containing surface in the other direction; Step 24, if the force direction If it is not equal to 0, π, π / 2, π / 4 or 3π / 4, it is determined to be a triangular nesting type, specifically: for the cell bottom surface containing surface with radius r and The circle with a radius of r in the same direction is tangent to the bottom surface of the cell, and the center of the circle is located at the vertex of the regular triangle with a side length of 2r; the radius in the other direction is The center of the cell base containing surface is located at the center of the regular triangle with a side length of 2r.

2. The method for designing a lightweight space-stacked load-bearing structure with enhanced toughness according to claim 1, characterized in that: The design requirements of the space stacking bearing structure in step 1 include the force magnitude of the space stacking bearing structure. , force direction , the panel size of the long side length a, the short side length b, the sandwich layer cell bottom surface area radius r; The force direction It means defining the lower left point of the panel of the spatially stacked load-bearing structure as the coordinate origin, and defining the positive direction of the X-axis along the long side of the panel from the coordinate origin as the angle between the force direction and the positive direction of the X-axis.

3. The method for designing a lightweight space-stacked load-bearing structure with enhanced toughness according to claim 2, characterized in that: The specific arrangement of the cells of the space-stacked load-bearing structure sandwich layer in step 3 is as follows: Step 3.1: Determine the maximum number of arrangements n in the X-axis direction based on the panel size and the bottom surface size of the sandwich layer cell. The specific calculation formula is: ; Step 32: According to the determined nesting type, determine the maximum number of arrangements m in the Y-axis direction. The specific calculation formula is: ; Step 33: Select any panel as the base, define the lower left corner of the panel as the coordinate origin, define the long side of the panel as the X-axis and the short side as the Y-axis, start arranging from the point tangent to both the X-axis and the Y-axis, arrange n cells continuously along the positive direction of the X-axis, and arrange m cells continuously along the positive direction of the Y-axis according to the selected nesting method.

4. The method for designing a lightweight space-stacked load-bearing structure with enhanced toughness according to claim 1 or 2, characterized in that: The N-1 type cell in step 4 is specifically a three-dimensional regular polyhedron with a regular N-gon at the bottom and an isosceles triangle with the side length of the N-gon as the base, and the side is folded along the edge of the regular N-gon at the bottom.

5. The method for designing a lightweight space-stacked load-bearing structure with enhanced toughness according to claim 4, characterized in that: The spatially stacked load-bearing structure in step 4 is a composite structure formed by arranging and stacking N-1 type cells on upper and lower panels in a certain nesting manner.

6. The method for designing a lightweight space-stacked load-bearing structure with enhanced toughness according to claim 5, characterized in that: The characteristic point selection method of the sandwich layer of the spatially stacked load-bearing structure in step 4 is: placing the regular polygon upright and selecting the vertices of the N-1 type cells as its characteristic points.

7. The method for designing a lightweight space-stacked load-bearing structure with enhanced toughness according to claim 2, characterized in that: The characteristic point position coordinates of the sandwich layer of the spatially stacked load-bearing structure in step 5 ( ) is calculated as follows: Step 51: Place the N-1 type cell upright, with the lower left corner of the bottom plate or top plate as the coordinate origin, the long side of the top plate or bottom plate as the x-axis, the other perpendicular side as the y-axis, and the z-axis parallel to the height direction of the cell three-dimensional structure; Step 52: For each upright cell, calculate the coordinates of the vertex farthest from the bottom surface ( ), where the subscript Represents the arrangement of the cell in the x-axis direction of the base plate. The following table Represents the arrangement of the cell in the y direction of the base plate; Step 53, calculate the List x-axis coordinate of the row cell vertex , The corresponding x-axis coordinate is the center position of the circle of the bottom surface of the N-1 cell, as follows: For the N-1 cells arranged on the base plate: ； ； For the N-1 type cells arranged on the top plate: ； ； ； Step 54, calculate the List The y-axis coordinate of the row cell vertex , It corresponds to the y-axis coordinate of the center of the cell bottom surface, as follows: For the N-1 type cells arranged on the base plate: ； For the N-1 type cells arranged on the top plate: ； Step 55, calculate the List z-axis coordinate of the row cell vertex , It corresponds to the height of the three-dimensional structure of the cell.

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