Single cell structure, multi-cell structure, gradient plate lattice structure and construction method

Abstract

The present application belongs to the field of additive manufacturing technology, and discloses a unit cell structure, a multi-cell structure, a gradient plate-like lattice structure and a construction method. The unit cell structure includes three first rectangular plates and six second rectangular plates. The three first rectangular plates are orthogonal to point O, dividing the three-dimensional space into eight regions, and the eight regions form a virtual cuboid; the six second rectangular plates coincide with the six diagonal faces of the virtual cuboid respectively, and intersect with the three first cuboids at point O. The multi-cell structure is composed of a number of unit cell structures of different densities assembled in a predetermined order along any of the three directions of left and right, front and back, and up and down in three-dimensional space; the unit cell structure, multi-cell structure, gradient plate-like lattice structure and construction method of the present application have simple design methods and strong feasibility. Compared with other gradient lattice lattice structures, they show uniform and stable plastic deformation when loads are applied, and have excellent energy absorption capacity.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, and in particular relates to a single-cell structure, a multi-cell structure, a gradient plate-like lattice structure and a construction method thereof. Background Art

[0002] In recent years, as the fields of aerospace and automotive parts continue to develop towards high performance, long life and low cost, their key components are increasingly adopting overall structural design and tend to be lightweight, complex and large-scale. This trend has greatly promoted the application and development of additive manufacturing technology. Due to the highly complex spatial topological configuration, porous lattice materials are difficult to be processed and formed in an integrated manner using traditional manufacturing methods. The layer-by-layer processing method of additive manufacturing can break through the limitations of traditional manufacturing methods, increase the freedom of internal structural design of lattice materials, and accurately control porosity and size and shape, thereby better exerting the advantages of lattice structure.

[0003] At present, common lattice structures mainly include body-centered cubic (BCC) and face-centered cubic (FCC) lattice structures based on rods. However, these structures are anisotropic and have poor stability. They are prone to stress concentration at the connection points and fail prematurely. They are difficult to meet the demand for high energy absorption capacity, which seriously affects their development and application in the industry.

[0004] Therefore, the existing technology needs to be improved and developed. Summary of the invention

[0005] The purpose of this application is to provide a single-cell structure, a multi-cell structure, a gradient plate lattice structure and a construction method. The design method is simple and highly feasible. Compared with other gradient lattice lattice structures, it has higher strength and stiffness, and exhibits uniform and stable plastic deformation when load is applied, and has excellent energy absorption capacity.

[0006] In a first aspect, the present application provides a unit cell structure, comprising three first rectangular plates and six second rectangular plates, wherein the three first rectangular plates are orthogonal to point O, dividing the three-dimensional space into eight regions, and the eight regions constitute a virtual cuboid; the six second rectangular plates respectively coincide with the six diagonal faces of the virtual cuboid, and intersect with the three first rectangular plates at point O.

[0007] The unit cell structure provided in the present application is designed by orthogonally arranging three first rectangular plates and overlapping six second rectangular plates with the six diagonal faces of the virtual rectangle. When the unit cell structure is subjected to external force load, the first rectangular plates and the second rectangular plates stabilize and reinforce the unit cell structure, thereby improving the strength and rigidity of the unit cell structure and thus improving the energy absorption capacity.

[0008] Furthermore, the three first rectangular parallelepiped plates and the six second rectangular parallelepiped plates intersect to form a plurality of triangular pyramids, and at least one triangular face of each of the triangular pyramids is provided with a through hole.

[0009] The present application converts the closed-cell structure of the unit cell structure into an open-cell structure by opening through holes, thereby facilitating the subsequent cleaning and discharge of the powder inside the unit cell structure.

[0010] Furthermore, the triangular surface provided with the through hole is a triangular surface that is not parallel to the vertical direction.

[0011] The present application ensures the structural stability of the vertical triangular faces by setting through holes on non-vertical triangular faces, so that when the unit cell structure is subjected to force, the triangular faces in the vertical direction are subjected to force uniformly and stably to withstand a larger load.

[0012] In a second aspect, the present application provides a multicellular structure, which is composed of a plurality of the above-mentioned single-cell structures of different densities assembled in a predetermined order along any one of the three directions of left and right, front and back, and up and down in a three-dimensional space.

[0013] The present application forms a multi-cellular structure by using single-cell structures of different densities, so that the multi-cellular structure presents a gradient. The gradient exhibits uniform and stable plastic deformation when a load is applied, thereby demonstrating excellent energy absorption capacity.

[0014] In a third aspect, the present application provides a gradient plate lattice structure, which is formed by a plurality of the above-mentioned multicellular structures being arrayed along the other two directions of the left-right, front-back, and up-down directions in three-dimensional space.

[0015] The present application uses a polyhedral structure as a basic unit for arraying. When the polyhedral structure presents a gradient and exhibits excellent energy absorption capacity, the energy absorption capacity of the gradient plate lattice structure is further improved.

[0016] In a fourth aspect, the present application provides a method for constructing a unit cell structure, comprising the following steps:

[0017] Establish a spatial rectangular coordinate system;

[0018] Taking the coordinate origin O of the spatial rectangular coordinate system as the center, constructing first rectangular plates with predetermined thickness and side length in the XOY plane, the XOZ plane and the YOZ plane respectively, wherein the three first rectangular plates are orthogonally arranged to divide the three-dimensional space into eight regions, and the eight regions form a virtual rectangular parallelepiped;

[0019] Second cuboid plates with predetermined thickness and side length are constructed within the six diagonal faces of the virtual cuboid, and the six second cuboid plates intersect with the three first cuboid plates at the coordinate origin O to form a plurality of triangular faces.

[0020] The present application constructs a unit cell structure through the above-mentioned construction method. The construction method is simple, highly feasible, and can quickly and accurately construct the designed structure.

[0021] Furthermore, after the unit cell structure is constructed as described above, the following steps are also included: a through hole is opened for each triangular face that is not parallel to the Z axis of the spatial rectangular coordinate system, and the center of gravity of the through hole coincides with the center of gravity of the triangular face where it is located.

[0022] In the present application, the centroid of the triangular face is used as the centroid of the through hole, which not only facilitates the positioning of the through hole, but also does not affect the stability of the unit cell structure after the through hole is opened.

[0023] In a fifth aspect, the present application provides a method for constructing a multi-cell structure, comprising the steps of the above-mentioned method for constructing a single-cell structure, and further comprising the following steps:

[0024] The unit cell structures of multiple different densities are assembled in a predetermined order along any one of the three directions of the X-axis, Y-axis and Z-axis of the spatial rectangular coordinate system to construct the polyhedral structure.

[0025] Furthermore, the method for constructing a multicellular structure also includes the following steps: performing chamfering processing on the size mutation locations of the assembly surfaces of two adjacent single-cell structures in the multicellular structure.

[0026] The present application performs rounding treatment on the dimensional mutation points of the assembly surface, thereby reducing stress concentration during the forming and preparation process, avoiding fatigue cracks or static load fractures, and thus ensuring excellent energy absorption capacity.

[0027] In a sixth aspect, the present application provides a method for constructing a gradient plate lattice structure, comprising the steps of the method for constructing the above-mentioned multi-cell structure, and further comprising the following steps:

[0028] The multicellular structure is used as a basic unit, and arrays are formed along the other two directions of the X-axis, Y-axis and Z-axis of the spatial rectangular coordinate system to construct the gradient plate lattice structure.

[0029] From the above, it can be seen that the single-cell structure, multi-cell structure, gradient plate lattice structure and construction method of the present invention, through the orthogonal arrangement of three first rectangular plates and the design in which six second rectangular plates coincide with the six diagonal faces of the virtual rectangular body, enable the first rectangular plates and the second rectangular plates to stabilize and reinforce the single-cell structure when the single-cell structure is subjected to external force loads, so that the single-cell structure exhibits uniform and stable plastic deformation and shows excellent energy absorption capacity.

[0030] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a unit cell provided in an embodiment of the present application.

[0032] Figure 2 A schematic diagram of the structure of a linear polyhedral structure provided in an embodiment of the present application.

[0033] Figure 3 A schematic diagram of the structure of the spacer multi-cell structure provided in an embodiment of the present application.

[0034] Figure 4 A schematic structural diagram of a linear gradient plate lattice structure provided in an embodiment of the present application.

[0035] Figure 5 A side view of a linear gradient plate lattice structure provided in an embodiment of the present application.

[0036] Figure 6 A schematic structural diagram of the interval gradient plate lattice structure provided in an embodiment of the present application.

[0037] Figure 7 A side view of the interval gradient plate lattice structure provided in an embodiment of the present application.

[0038] Figure 8 A flowchart for constructing a unit cell structure provided in an embodiment of the present application.

[0039] Fig. 9 This is a schematic diagram of the structure of the first intermediate provided in an embodiment of the present application.

[0040] Fig.10 This is a schematic diagram of the structure of the second intermediate provided in an embodiment of the present application.

[0041] Fig.11 A schematic diagram of the structure of the final body provided in the embodiment of the present application.

[0042] Fig.12 A flowchart for constructing a multicellular structure provided in an embodiment of the present application.

[0043] Fig.13 A flowchart for constructing a gradient plate lattice structure provided in an embodiment of the present application.

[0044] Fig.14This is a compression performance comparison curve of the linear gradient plate lattice structure provided in the embodiment of the present application and other gradient lattice lattice structures.

[0045] Fig.15 A curve chart comparing the compression performance of the interval gradient plate lattice structure provided in the embodiment of the present application and other gradient lattice lattice structures.

[0046] Explanation of reference numerals: 1. first rectangular plate; 2. second rectangular plate; 3. through hole. DETAILED DESCRIPTION

[0047] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] like Figure 1 As shown, a unit cell structure provided by the present invention includes three first rectangular plates 1 and six second rectangular plates 2. The three first rectangular plates 1 are orthogonal to point O, dividing the three-dimensional space into eight areas, and the eight areas form a virtual cuboid; the six second cuboid plates 2 coincide with the six diagonal faces of the virtual cuboid respectively, and intersect with the three first cuboid plates 1 at point O.

[0053] Through this technical solution, when the unit cell structure is subjected to external force load, the first rectangular plate 1 and the second rectangular plate 2 stabilize and reinforce the unit cell structure, thereby improving the strength and rigidity of the unit cell structure, thereby improving its energy absorption capacity.

[0054] In some preferred embodiments, the three first rectangular plates 1 and the six second rectangular plates 2 intersect to form a plurality of triangular pyramids, and at least one triangular face of each triangular pyramid is provided with a through hole 3. By providing the through hole 3, the closed-cell structure of the unit cell structure is converted into an open-cell structure, so as to facilitate the cleaning and discharge of the powder inside the unit cell structure after the subsequent laser selective melting forming. The specific cleaning method may be to use a high-pressure spray gun driven by a robotic arm to blow air on the powder so that the powder is discharged from the through hole 3; or it may be to use a cleaning method so that the cleaning liquid flushes out the internal powder; or it may be to use ultrasonic cleaning to accelerate the discharge of the internal powder by vibration. Preferably, the shape of the through hole 3 is circular or regular polygonal. By designing the shape of the through hole 3 as a regular pattern, the influence of irregular patterns on the strength of the unit cell structure can be avoided. Specifically, the center of gravity of the through hole 3 coincides with the center of gravity of the triangular face on which it is located. By designing the center of gravity of the through hole 3 and the center of gravity of the triangular face on which it is located to coincide, it is convenient to make a hole on the triangular face. Moreover, making the through hole 3 in this way can minimize the impact of the opening structure on the strength and stiffness of the unit cell structure, thereby ensuring the stability of the unit cell structure.

[0055] In some preferred embodiments, the triangular face provided with the through hole 3 is a triangular face that is not parallel to the vertical direction. By providing the through hole 3 on the non-vertical triangular face, the stability of the structure of the vertical triangular face is ensured, so that when the unit cell structure is subjected to force, the triangular face in the vertical direction is subjected to force uniformly and stably, so as to withstand a larger load.

[0056] The present invention provides a multicellular structure, which is composed of a plurality of the above-mentioned unit cell structures of different densities assembled in a predetermined order along any one of the three directions of left and right, front and back, and up and down in a three-dimensional space. The predetermined order can be that the relative density of the unit cell structure increases from bottom to top, or the relative density of the unit cell structure is arranged in a large and a small interval from bottom to top, but is not limited to the above two orders. When the predetermined order is that the relative density of the unit cell structure increases from bottom to top, the result is as follows Figure 2 The linear multi-cell structure shown in FIG. 1 ; when the predetermined order is that the relative density of the unit cell structure is arranged from bottom to top in a large-small interval, the result is as follows Figure 3 The interspaced polyhedral structure shown.

[0057] It should be noted that unit cell structures of different densities refer to the fact that the thicknesses of the first rectangular plate 1 and the second rectangular plate 2 of two adjacent unit cell structures are different, wherein the thicknesses of the first rectangular plate 1 and the second rectangular plate 2 of the same unit cell structure are the same; the relative density refers to the plate thickness of the unit cell structure, and the relative density is controlled by the thickness of the first rectangular plate 1 and the thickness of the second rectangular plate 2, and the magnitude of the relative density is positively correlated with the plate thickness; that is, the multiple unit cell structures within the linear multi-cell structure are assembled and combined in the order of increasing or decreasing plate thickness, and the multiple unit cell structures within the spaced multi-cell structure are assembled and combined in the order of thick and thin plate thickness.

[0058] Through this technical solution, the multi-cellular structure presents a gradient, and the gradient exhibits uniform and stable plastic deformation when load is applied, thereby demonstrating excellent energy absorption capacity.

[0059] The present invention provides a gradient plate-like lattice structure, which is formed by arranging a plurality of the above-mentioned polyhedral structures in the other two directions of the left-right, front-back and top-bottom directions in three-dimensional space. When the polyhedral structure is a linear polyhedral structure, the array is as follows: Figure 4 and Figure 5 The linear gradient plate lattice structure shown in FIG. 1 is a linear gradient plate lattice structure; when the polyhedral structure is an interval polyhedral structure, the array is obtained as follows Figure 6 and Figure 7 The spaced gradient plate lattice structure shown.

[0060] The present application uses a polyhedral structure as a basic unit for arraying. When the polyhedral structure presents a gradient and exhibits excellent energy absorption capacity, the energy absorption capacity of the gradient plate lattice structure is further improved.

[0061] like Figure 8 As shown, the present invention provides a method for constructing a unit cell structure, which is used to construct the above-mentioned unit cell structure, and comprises the following steps:

[0062] S10: Establishing a spatial rectangular coordinate system;

[0063] S20: With the coordinate origin O of the spatial rectangular coordinate system as the center, construct first rectangular plates 1 with predetermined thickness and side length in the XOY plane, the XOZ plane and the YOZ plane respectively. The three first rectangular plates 1 are orthogonally arranged to divide the three-dimensional space into eight regions. The eight regions form a virtual rectangular parallelepiped, and the following is obtained: Fig. 9 The first intermediate shown;

[0064] S30: Construct second cuboid plates 2 with predetermined thickness and side length in the six diagonal faces of the virtual cuboid. The six second cuboid plates 2 intersect with the three first cuboid plates 1 at the coordinate origin O to form a plurality of triangular faces. Fig.10 The second intermediate is shown.

[0065] In some preferred embodiments, after constructing the unit cell structure, the following steps are further included:

[0066] S40: Open a through hole 3 for each triangular face that is not parallel to the Z axis of the spatial rectangular coordinate system, and obtain the following Fig.11 The final body shown.

[0067] like Fig.12 As shown, the present invention also provides a method for constructing a multi-cell structure, which is used to construct the above-mentioned multi-cell structure, including steps S10-S40 of the method for constructing a single-cell structure, and further comprising the following steps:

[0068] S50: assembling a plurality of unit cell structures of different densities in any direction of the three directions of the X-axis, Y-axis and Z-axis of the spatial rectangular coordinate system in a predetermined order to construct a structure such as Figure 2 In this embodiment, a plurality of unit cell structures of different densities are assembled in a predetermined order along the Z-axis direction of the spatial rectangular coordinate system. The predetermined order is that the relative density of the unit cell structures increases from bottom to top or the relative density of the unit cell structures is arranged in a large and a small interval from bottom to top. If the relative density is increased from bottom to top, the following is obtained: Figure 2 The linear polyhedral structure shown in the figure; if it is assembled in the order of relative density from bottom to top with a large and a small interval, the following is obtained Figure 3 The interspaced polyhedral structure shown.

[0069] It should be noted that the relative density in this embodiment refers to the plate thickness of the unit cell structure. The relative density is controlled by the thickness of the first rectangular plate 1 and the thickness of the second rectangular plate 2. The magnitude of the relative density is positively correlated with the plate thickness. In the same unit cell structure, the thickness of the first rectangular plate 1 is the same as the thickness of the second rectangular plate 2.

[0070] In some preferred embodiments, the method for constructing a multicellular structure further comprises the following steps:

[0071] S60: Fillet the corners of the assembly surfaces of two adjacent single-cell structures in a multi-cell structure where there is a size mutation.

[0072] By rounding the dimensional mutation points of the assembly surface, stress concentration during the forming process can be reduced, fatigue cracks or static load fractures can be avoided, thereby ensuring excellent energy absorption capacity.

[0073] It should be noted that the above-mentioned assembly surface refers to the connecting surface for connecting two adjacent unit cell structures; the above-mentioned size mutation refers to the different widths of the connecting surfaces of two adjacent unit cell structures with different densities, that is, when connecting two connecting surfaces of different sizes, the connecting parts are rounded to make the connection between the two rectangular plates have a smooth transition.

[0074] like Fig.13 As shown, the present invention also provides a method for constructing a gradient plate-like lattice structure, which is used to construct the above-mentioned gradient plate-like lattice structure, including steps S10-S60 of the method for constructing a multi-cell structure, and also includes the following steps:

[0075] S70: Using the constructed polyhedral structure as a basic unit, arraying along the other two directions of the X-axis, Y-axis and Z-axis of the spatial rectangular coordinate system to construct a gradient plate lattice structure. In this embodiment, the polyhedral structure is arrayed along the X-axis direction and the Y-axis direction of the spatial rectangular coordinate system.

[0076] In specific applications, if a linear polyhedral structure is used as a basic unit for arraying, a linear gradient plate-like lattice structure is obtained; if an interval polyhedral structure is used as a basic unit for arraying, an interval gradient plate-like lattice structure is obtained.

[0077] The following is a further example of the construction method of the gradient plate lattice structure:

[0078] Example 1

[0079] S100: Establishing a spatial rectangular coordinate system;

[0080] S200: With the coordinate origin O of the spatial rectangular coordinate system as the center, construct first rectangular plates 1 with a thickness of 1 mm and a side length of 100 mm in the XOY plane, the XOZ plane and the YOZ plane respectively. The three first rectangular plates 1 are orthogonally arranged to divide the three-dimensional space into eight virtual cubic areas. The eight virtual cubic areas form a virtual cube.

[0081] S300: Construct a 1mm thick and 1mm long mm, a second rectangular plate 2 with a width of 100 mm, six second rectangular plates 2 intersect with three first rectangular plates 1 at the coordinate origin O to form a plurality of triangular faces;

[0082] S400: opening a through hole 3 for each triangular face that is not parallel to the Z axis of the spatial rectangular coordinate system to construct a unit cell structure;

[0083] Repeat the above steps to construct a unit cell structure in which the thickness of the first rectangular plate 1 and the thickness of the second rectangular plate 2 are both 2 mm, 3 mm, 4 mm and 5 mm;

[0084] S500: Assemble unit cell structures with different plate thicknesses in a descending order or a descending order along the Z-axis direction of the spatial rectangular coordinate system to construct a linear multicellular structure; for example, five unit cell structures with thicknesses of the first rectangular plate 1 and the second rectangular plate 2 of 1 mm, 2 mm, 3 mm, 4 mm and 5 mm are assembled in the order of 1 mm, 2 mm, 3 mm, 4 mm and 5 mm.

[0085] S600: Perform fillet processing on the size mutation of the assembly surfaces of two adjacent single-cell structures in a linear multi-cell structure;

[0086] S700: With the linear polyhedral structure as the basic unit, the array is arranged along the X-axis and Y-axis directions of the spatial rectangular coordinate system to construct a linear gradient plate lattice structure.

[0087] The constructed linear gradient plate lattice structure (Plate lattice) and the linear gradient cubic lattice structure (Cubic), linear gradient octahedral truss lattice structure (Octet truss) and linear gradient body-centered cubic lattice structure (BCC) with the same relative density were processed with three-dimensional model data respectively, and formed based on the laser selective melting technology of powder bed melting. The laser power range of the forming process is 160-250W, the scanning speed range is 800-1500mm / s, and the scanning spacing range is 0.09-0.12mm. The linear gradient plate lattice structure entity, the linear gradient cubic lattice structure entity, the linear gradient octahedral truss structure entity and the linear gradient body-centered cubic lattice structure entity are obtained. The compression performance comparison test is carried out using a universal material testing machine. The compression speed of the universal material testing machine is set to 1mm / min (millimeter per minute). The universal material testing machine automatically records the load and displacement data, and finally forms the following Fig.14 The compression performance comparison curve shown in the figure is Fig.14It can be seen intuitively that when the compressive stress (Strain) is less than 5%, the energy absorption of the linear gradient plate lattice structure entity, the linear gradient cube lattice structure entity, the linear gradient octahedron truss lattice structure entity and the linear gradient body-centered cubic lattice structure entity is not significantly different. However, when the compressive stress (Strain) is greater than 5%, the energy absorption of the linear gradient plate lattice structure entity increases sharply, while the energy absorption of the linear gradient cube lattice structure entity, the linear gradient octahedron truss lattice structure entity and the linear gradient body-centered cubic lattice structure entity is slow. After the test, the area enclosed by each curve and the horizontal axis is calculated by calculus, which is the energy absorption capacity of the lattice structure. It is calculated that the energy absorption capacity of the linear gradient plate lattice structure entity is much greater than that of the linear gradient cube lattice structure entity, the linear gradient octahedron truss lattice structure entity and the linear gradient body-centered cubic lattice structure entity.

[0088] It should be noted that the above-mentioned same relative density means that the linear gradient plate lattice structure has the same size side length as the linear gradient cubic lattice structure, the linear gradient octahedral truss lattice structure and the linear gradient body-centered cubic lattice structure, and the same volume. In other words, the experiment is carried out under the condition that the control variables of the linear gradient plate lattice structure, the linear gradient cubic lattice structure, the linear gradient octahedral truss lattice structure and the linear gradient body-centered cubic lattice structure are the same, and the only difference is the structure. In this way, the accuracy and scientificity of the experimental data are guaranteed.

[0089] In specific applications, the thickness and side length of the first rectangular plate 1 can be adaptively selected according to actual needs, and the thickness, length and width of the second rectangular plate 2 can also be adaptively selected according to actual needs. When selecting, it is necessary to ensure that the thickness of the first rectangular plate 1 is the same as the thickness of the second rectangular plate 2. The above is only one embodiment of the present invention and should not be limited to this.

[0090] Example 2

[0091] The difference between this example and Example 1 is that the gradient plate-like lattice structure in this example is an interval gradient plate-like lattice structure, that is, this example is arrayed with an interval multi-cell structure as the basic unit, that is, multiple unit cell structures are assembled in the order of large and small intervals. For example, in this example, after constructing five unit cell structures in which the thickness of the first rectangular plate 1 and the thickness of the second rectangular plate 2 are both 1mm, 2mm, 3mm, 4mm and 5mm in step S400, the five unit cell structures are assembled in the order of 1mm, 4mm, 2mm, 3mm and 5mm.

[0092] The interval gradient plate lattice structure of this example is compared with the interval gradient cube lattice structure, the interval gradient octahedron truss lattice structure and the interval gradient body-centered cubic lattice structure by using a universal material testing machine for compression performance comparison test, and finally the following is formed: Fig.15 The compression performance comparison curve shown is composed of Fig.15 It can be seen intuitively that when the compressive stress (Strain) is less than 5%, the energy absorption of the interval gradient plate lattice structure entity, the interval gradient cube lattice structure entity, the interval gradient octahedron truss lattice structure entity and the interval gradient body-centered cubic lattice structure entity is not significantly different. However, when the compressive stress (Strain) is greater than 5%, the energy absorption of the interval gradient plate lattice structure entity increases sharply, while the energy absorption of the interval gradient cube lattice structure entity, the interval gradient octahedron truss lattice structure entity and the interval gradient body-centered cubic lattice structure entity increases slowly. After the test, the area enclosed by each curve and the horizontal axis is calculated by calculus, which is the energy absorption capacity of the lattice structure. It is calculated that the energy absorption capacity of the interval gradient plate lattice structure entity is much greater than that of the interval gradient cube lattice structure entity, the interval gradient octahedron truss lattice structure entity and the interval gradient body-centered cubic lattice structure entity.

[0093] In summary, the gradient plate lattice structure of the present application has excellent energy absorption capability.

[0094] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A multicellular structure, comprising a plurality of unit cell structures consisting of three first rectangular parallelepiped plates and six second rectangular parallelepiped plates, characterized in that: The three first rectangular parallelepiped plates are orthogonal to point O, dividing the three-dimensional space into eight areas, and the eight areas form a virtual rectangular parallelepiped; the six second rectangular parallelepiped plates respectively coincide with the six diagonal faces of the virtual rectangular parallelepiped, and intersect with the three first rectangular parallelepiped plates at point O; The three first rectangular parallelepiped plates and the six second rectangular parallelepiped plates intersect to form a plurality of triangular pyramids, and at least one triangular face of each of the triangular pyramids is provided with a through hole; The shape of the through hole is circular or regular polygonal; The triangular face provided with the through hole is a triangular face that is not parallel to the vertical direction; The multi-cell structure is composed of a plurality of unit cell structures of different densities assembled in a predetermined order along any one of the three directions of left and right, front and back, and up and down in a three-dimensional space; The predetermined sequence includes: the relative density of the unit cell structure is arranged alternately with high density and low density along the assembly direction.

2. A gradient plate lattice structure, characterized in that: The multicellular structures according to claim 1 are arranged in an array along the other two directions of the left-right, front-back and up-down directions in a three-dimensional space.

3. A method for constructing a multicellular structure as claimed in claim 1, characterized in that: The following steps are involved: Establish a spatial rectangular coordinate system; Taking the coordinate origin O of the spatial rectangular coordinate system as the center, constructing first rectangular plates with predetermined thickness and side length in the XOY plane, the XOZ plane and the YOZ plane respectively, wherein the three first rectangular plates are orthogonally arranged to divide the three-dimensional space into eight regions, and the eight regions form a virtual rectangular parallelepiped; Constructing second cuboid plates of predetermined thickness and side length in six diagonal faces of the virtual cuboid, wherein the six second cuboid plates intersect with the three first cuboid plates at the coordinate origin O to form a plurality of triangular faces; A through hole is opened for each triangular face that is not parallel to the Z axis of the spatial rectangular coordinate system, wherein the shape of the through hole is a circle or a regular polygon, and the center of gravity of the through hole coincides with the center of gravity of the triangular face where the through hole is located, so as to construct a unit cell structure; Assembling a plurality of the unit cell structures of different densities in any direction of the three directions of the X-axis, the Y-axis and the Z-axis of the spatial rectangular coordinate system in a predetermined order to construct the multi-cell structure; The predetermined sequence includes: the relative density of the unit cell structure is arranged alternately with high density and low density along the assembly direction.

4. The method for constructing a multicellular structure according to claim 3, characterized in that: The following steps are also included: The size mutation locations of the assembly surfaces of two adjacent single-cell structures in the multi-cell structure are chamfered.

5. A method for constructing a gradient plate lattice structure, characterized in that: The method for constructing a multicellular structure according to claim 3 further comprises the following steps: The multicellular structure is used as a basic unit, and arrays are formed along the other two directions of the X-axis, Y-axis and Z-axis of the spatial rectangular coordinate system to construct the gradient plate lattice structure.

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