Hexahedral 3D printing dot matrix structure strength checking method and device and electronic equipment

Abstract

This invention provides a method, apparatus, and electronic device for strength verification of hexahedral 3D printed lattice structures, relating to the technical field of 3D printed lattice structure verification. The method includes: acquiring the lattice structure corresponding to the target object and determining hexahedral lattice elements from the three-dimensional model of the lattice structure; determining the homogenized solid structure corresponding to the hexahedral lattice elements based on periodic boundary conditions and equivalent material parameters of the hexahedral lattice elements; and performing strength verification of the lattice structure of the target object based on macroscopic and mesoscopic finite element strength analysis of the homogenized solid structure. This alleviates the technical problem that existing technologies cannot quickly and accurately perform strength verification and lattice parameter optimization of the designed 3D printed lattice product structure.

Description

Technical Field

[0001] This invention relates to the technical field of 3D printed lattice structure verification, and in particular to a method, apparatus and electronic device for verifying the strength of a hexahedral 3D printed lattice structure. Background Technology

[0002] In recent years, with the rapid development of material preparation processes and equipment, 3D printed metal lattice materials have attracted attention from many fields such as aerospace, naval shipbuilding, and biomedicine, and are highly promising advanced lightweight, high-strength, and multifunctional materials. They have already been applied to aerospace components such as satellite thermal insulation and energy storage solar panels and titanium alloy aircraft engines, demonstrating excellent performance in impact resistance, vibration damping, heat transfer, high structural stiffness, and structural self-cooling. In particular, their lightweight characteristics enable structures to possess greater specific stiffness and specific strength, and their development is still rapid.

[0003] However, in current applications, the actual 3D printed lattice structures are quite complex. During the structural design phase, a long calculation time is required, and the verification results are not ideal, which greatly affects the lightweight efficiency and product reliability of 3D printed lattice structures. Summary of the Invention

[0004] The purpose of this invention is to provide a method, apparatus, and electronic device for strength verification of a hexahedral 3D printed lattice structure, so as to alleviate the technical problem that the existing technology cannot quickly and accurately perform strength verification and lattice parameter optimization of the designed 3D printed lattice product structure.

[0005] In a first aspect, embodiments of the present invention provide a method for strength verification of a hexahedral 3D printed lattice structure, comprising:

[0006] Obtain the lattice structure corresponding to the target object, and determine the hexahedral lattice unit from the three-dimensional model of the lattice structure;

[0007] Based on the periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit, the homogenized solid structure corresponding to the hexahedral lattice unit is determined.

[0008] Based on the macroscopic finite element strength analysis and the mesoscopic finite element strength analysis of the homogenized solid structure, the strength of the lattice structure of the target object is checked.

[0009] In conjunction with the first aspect, embodiments of the present invention provide a first possible implementation of the first aspect, wherein the step of determining the homogenized solid structure corresponding to the hexahedral lattice unit based on periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit includes:

[0010] Based on the periodic boundary conditions and the symmetry of the hexahedral lattice element, the equivalent material parameters of the hexahedral lattice element are calculated.

[0011] Based on the equivalent material parameters, the hexahedral lattice units are replaced with homogenized solid structures.

[0012] In conjunction with the first aspect, embodiments of the present invention provide a second possible implementation of the first aspect, wherein the step of calculating the equivalent material parameters of the hexahedral lattice element based on periodic boundary conditions and the symmetry of the hexahedral lattice element includes:

[0013] Based on the symmetry of the hexahedral lattice unit, the symmetry mesh plane is determined;

[0014] By constraining the displacement of each node pair on the symmetric mesh plane by periodic boundary conditions, the equivalent material parameters of the hexahedral lattice element are determined. The equivalent material parameters include area, Young's modulus, and Poisson's ratio.

[0015] In conjunction with the first aspect, this invention provides a third possible implementation of the first aspect, wherein the step of determining the symmetry mesh plane based on the symmetry of the hexahedral lattice elements includes:

[0016] Map the positions of each node in the hexahedral lattice to a symmetrical plane to determine the symmetrical mesh plane;

[0017] or,

[0018] Based on the symmetry of the hexahedral lattice, a symmetric mesh plane is established.

[0019] In conjunction with the first aspect, this invention provides a fourth possible implementation of the first aspect, wherein the step of verifying the strength of the lattice structure of the target object based on the macroscopic finite element strength analysis and the mesoscopic finite element strength analysis of the homogenized solid structure includes:

[0020] A macroscopic finite element strength check was performed on the homogenized solid structure to determine the maximum strain load on the homogenized solid structure.

[0021] The maximum strain load is added to the unit lattice element of the homogenized solid structure, and the microscopic strength of the homogenized solid structure after adding the maximum strain load is checked.

[0022] In conjunction with the first aspect, embodiments of the present invention provide a fifth possible implementation of the first aspect, wherein the method further includes:

[0023] If either the strength value or the yield strength value of the homogenized solid structure after adding the maximum strain load does not meet the preset strength threshold range, then the structural parameters of the lattice element are corrected.

[0024] Secondly, embodiments of the present invention also provide a strength verification device for a hexahedral 3D printed lattice structure, comprising:

[0025] The first determining module obtains the lattice structure corresponding to the target object and determines the hexahedral lattice unit from the three-dimensional model of the lattice structure.

[0026] The second determining module determines the homogenized solid structure corresponding to the hexahedral lattice unit based on the periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit.

[0027] The verification module performs strength verification on the lattice structure of the target object based on the macroscopic finite element strength analysis and the mesoscopic finite element strength analysis of the homogenized solid structure.

[0028] Thirdly, an embodiment provides an electronic device including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the method described in any of the foregoing embodiments.

[0029] Fourthly, an embodiment provides a machine-readable storage medium storing machine-executable instructions, which, when invoked and executed by a processor, cause the processor to perform the steps of the method described in any of the foregoing embodiments.

[0030] This invention provides a method, apparatus, and electronic device for strength verification of a hexahedral 3D printed lattice structure. The method involves creating a 3D model of the lattice structure corresponding to the target object to be printed, determining the hexahedral lattice elements from the 3D model, constraining the hexahedral lattice elements based on periodic boundary conditions, calculating the equivalent material parameters of the hexahedral lattice elements, and determining the homogenized solid structure corresponding to the hexahedral lattice elements based on these equivalent material parameters. Combining macroscopic and mesoscopic finite element strength analysis, the strength of the target object's lattice structure is verified. The strength verification is achieved through a simple mesh structure, optimizing both verification efficiency and difficulty.

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 A flowchart of a method for strength verification of a hexahedral 3D printed lattice structure provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of a hexahedral lattice unit provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of a symmetrical mesh provided for an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram showing the comparison between the six-dot lattice unit and the homogenized entity provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of extracting the maximum strain value provided in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the strength analysis of the lattice structure after strain loading provided in an embodiment of the present invention;

[0040] Figure 7 Flowchart of another method for strength verification of a hexahedral 3D printed lattice structure provided in an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the functional modules of a hexahedral 3D printed lattice structure strength verification device provided in an embodiment of the present invention;

[0042] Figure 9 This is a schematic diagram of the hardware architecture of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] The inventors discovered that current methods for verifying lattice structures primarily involve full-scale analysis, which directly meshes the constructed 3D-printed lattice structure model using finite element methods (FEM) and then performs strength verification through FEM. However, for complex lattice structures, mesh generation is extremely difficult and computationally time-consuming. Furthermore, due to the complexity of the mesh structure, FEM calculations under full-scale analysis suffer from high convergence difficulty and low simulation accuracy, exhibiting significant limitations.

[0045] Based on this, the present invention provides a method, apparatus and electronic device for strength verification of hexahedral 3D printed lattice structures. Compared with full-scale analysis, it can achieve a smaller computational requirement and lower convergence difficulty through a simpler mesh structure, thereby optimizing the method for strength verification of hexahedral 3D printed lattice structures.

[0046] To facilitate understanding of this embodiment, a method for strength verification of a hexahedral 3D printed lattice structure disclosed in this embodiment of the invention will be described in detail first. This method can be applied to intelligent control devices such as host computers and servers.

[0047] Figure 1 A flowchart of a method for strength verification of a hexahedral 3D printed lattice structure provided in an embodiment of the present invention.

[0048] Based on homogenization theory, a multi-scale analysis method was designed for strength verification and structural optimization of hexahedral 3D printed lattice structures. (Refer to...) Figure 1 This method may include the following steps:

[0049] Step S102: Obtain the lattice structure corresponding to the target object, and determine the hexahedral lattice unit from the three-dimensional model of the lattice structure.

[0050] Among them, the hexahedral lattice unit is as follows Figure 2 As shown, it can be understood as a symmetrical three-dimensional structure with six sides.

[0051] Step S104: Based on the periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit, determine the homogenized solid structure corresponding to the hexahedral lattice unit.

[0052] Step S106: Based on the macroscopic finite element strength analysis and the mesoscopic finite element strength analysis of the homogenized solid structure, the strength of the lattice structure of the target object is checked.

[0053] In a preferred embodiment of practical application, the lattice structure corresponding to the target object to be printed is three-dimensionally modeled, and its hexahedral lattice elements are determined from its three-dimensional model. Then, the hexahedral lattice elements are constrained according to the periodic boundary conditions, and the equivalent material parameters of the hexahedral lattice elements are calculated. Based on the equivalent material parameters, the homogenized solid structure corresponding to the hexahedral lattice elements is determined. Combining macroscopic finite element strength analysis and mesoscopic finite element strength analysis, the strength of the lattice structure of the target object is checked. The strength check is achieved through a simple mesh structure, which optimizes the checking efficiency and the checking difficulty.

[0054] In some embodiments, the step S102, which involves obtaining the lattice structure corresponding to the target object and determining the hexahedral lattice elements from the three-dimensional model of the lattice structure, includes:

[0055] Step 1.1) Obtain the lattice structure corresponding to the target object and perform 3D modeling on the lattice structure to obtain the 3D model corresponding to the target object.

[0056] Here, different methods can be selected to determine the three-dimensional model of the target object depending on the different sources of the lattice structure. This embodiment of the invention does not restrict the source of the lattice structure. Specifically, if the lattice structure is a 3D printed lattice structure product that has been initially designed, the three-dimensional model of the lattice structure can be obtained directly. Alternatively, the 3D printed lattice structure product can be designed with a lattice structure using three-dimensional design software such as Spaceclaim or ProE to generate a three-dimensional model of the lattice structure product, and the generated three-dimensional model can be applied to the design of lightweight structural products.

[0057] Step 1.2) Determine the hexahedral lattice elements from the 3D model.

[0058] Based on step 1.1 above, if the 3D model of the lattice structure product is obtained directly, then the lattice units need to be separated from the model in the 3D design software by cutting or other model processing methods; if the 3D model of the lattice structure product is obtained by generating lattice structure units, then the lattice unit model is directly created according to the lattice structure parameters set during generation.

[0059] In some embodiments, step S104 can be implemented by the following steps, specifically including:

[0060] Step 2.1): Based on the periodic boundary conditions and the symmetry of the hexahedral lattice element, calculate the equivalent material parameters of the hexahedral lattice element.

[0061] First, based on the homogenization theory, the equivalent material parameters of the lattice elements are calculated, including density, Young's modulus, and Poisson's ratio. Since periodic boundary conditions are required when calculating the equivalent material properties, it is necessary to ensure that the structure has the same mesh structure on corresponding periodic surfaces. This is necessary for subsequent node coupling, i.e., determining the symmetric mesh plane based on the symmetry of the hexahedral lattice elements.

[0062] As an optional implementation, in constructing a symmetric mesh, specifically as follows: Figure 3 As shown, face ① and face ② are a pair of planes. It is necessary to ensure that the nodes on the mesh correspond one-to-one as shown in the right figure. There are two main ways to achieve this:

[0063] The positions of each node in the hexahedral lattice are mapped to a symmetrical plane to determine the symmetrical mesh plane; that is, through mesh mapping, the positions of each node on face ① are mapped to face ②, thereby ensuring that the meshes of face ① and face ② are completely consistent.

[0064] or,

[0065] Based on the symmetry of the hexahedral lattice, a symmetrical mesh plane is established, that is, a symmetrical mesh is constructed. In the process of drawing the mesh, the symmetry of the lattice unit is used to continuously establish symmetrical planes and rely on the symmetrical replication of the mesh to establish a symmetrical mesh structure.

[0066] Secondly, by constraining the displacement of each node pair on the symmetric mesh plane by periodic boundary conditions, the equivalent material parameters of the hexahedral lattice element are determined; these equivalent material parameters include area, Young's modulus, and Poisson's ratio.

[0067] It should be noted that the reason for using periodic boundary conditions in the embodiments of the present invention is that there is a difference between the equivalent material properties obtained by calculating a single cell and the equivalent material properties obtained by calculating multiple cells macroscopically. This is because cells are arranged in large numbers in the structure and there are interactions between cells in both the horizontal and vertical directions. Therefore, by limiting the displacement on the boundary through periodic boundary conditions, more accurate equivalent material properties can be obtained.

[0068] Therefore, the node sets X0, X1, Y0, Y1, Z0, and Z1 on the six boundary surfaces of the element lattice model are constrained by periodic boundary conditions defined according to the following formula; where, taking displacement loading in the X direction as an example, the formula for defining the periodic boundary conditions is:

[0069]

[0070] Where u, v, and w are the displacements in the X, Y, and Z directions, respectively, and u XX u XY u XZThe load displacements on the planes in the X, Y, and Z directions are respectively. This constraint specifically acts on the symmetric mesh plane, and the displacements of the corresponding nodes on X0 and X1, Y0 and Y1, and Z0 and Z1 must satisfy this periodic boundary condition constraint. Using this constraint, mechanical tensile tests are performed on the lattice elements in the three directions. The equivalent material properties of the lattice elements are calculated using basic material mechanics formulas.

[0071]

[0072] Where ρ is density, E is Young's modulus, and v is Poisson's ratio.

[0073] Step 2.2): Based on the equivalent material parameters, replace the hexahedral lattice units with homogenized solid structures.

[0074] After obtaining equivalent material properties in the aforementioned embodiments, the lattice portion of the designed 3D printed lattice structure product is replaced with solid unit portions. Specifically, the three-dimensional solid model is redrawn, and the lattice structure portion is drawn as a solid. The unit material properties use equivalent material properties (i.e., the lattice structure is homogenized according to the homogenization theory), such as... Figure 4 As shown.

[0075] In some embodiments, the reliability of the lattice structure verification can be ensured by combining macroscopic and microscopic finite element strength verification; for example, step S106 may include:

[0076] Step 3.1) Perform macroscopic finite element strength verification on the homogenized solid structure to determine the maximum strain load on the homogenized solid structure.

[0077] In this process, the maximum Von Mises stress and strain of the homogenized solid structure are obtained through finite element simulation. Then, the ultimate tensile strength and yield strength of the material are compared to determine whether the structural strength meets the requirements, and the strain value at the location of maximum strain is extracted. Figure 5 As shown. The location of maximum strain can be understood as the part of the homogenized solid structure that bears the largest strain load and some surrounding elements, requiring the extracted element volume to be approximately the same as the lattice element.

[0078] Step 3.2) Add the maximum strain load to the unit lattice element of the homogenized solid structure and perform a mesoscopic strength check on the homogenized solid structure after adding the maximum strain load.

[0079] Here, the maximum strain load on the structure is added to the unit lattice element, and then the microscopic strength of the added lattice element is checked. Similarly, the maximum Von-Mises stress and strain of the structure are calculated using finite element simulation and compared with the material's ultimate tensile strength and yield strength. Figure 6 As shown.

[0080] As an optional embodiment, the method further includes:

[0081] Step 3.3): If the strength value and yield strength value of the homogenized solid structure after adding the maximum strain load both meet their respective preset strength threshold ranges, then the lattice structure corresponding to the target object is qualified.

[0082] Step 3.3): If either the strength value or the yield strength value of the homogenized solid structure after adding the maximum strain load does not meet its respective preset strength threshold range, then the structural parameters of the lattice element are corrected.

[0083] Here, based on the comparison results of the strength value and yield strength value with their corresponding preset strength threshold ranges, different modifications can be made to the structural parameters of the lattice element. These modifications include: if there is redundancy in structural strength (i.e., the Von-Mises stress obtained from the macro- and micro-scale finite element simulation is less than or even much less than the material's ultimate strength), then, according to lightweight requirements, the length of the lattice element can be appropriately increased, and its thickness reduced; if there is insufficient structural strength (i.e., the Von-Mises stress obtained from the macro- and micro-scale finite element simulation is greater than the material's ultimate strength or yield strength (depending on product requirements), then the length of the lattice element needs to be appropriately reduced, and its thickness increased. Furthermore, after generating new lattice elements through this optimization, the strength verification process is repeated.

[0084] In some embodiments, such as Figure 7 As shown, a method for strength verification of a hexahedral 3D printed lattice structure is also provided, including the following steps:

[0085] 01 Initial lattice structure product design; 02 Extract lattice elements; 03 Draw symmetrical mesh structure; 04 Calculate equivalent material properties of lattice elements using periodic boundary conditions; 05 Replace the lattice structure in the product with a solid structure, and set the material parameters to equivalent material parameters; 06 Macroscopic strength check; 07 Extract the location of the maximum load; 08 Add the maximum load under the macroscopic structure to the lattice element model and perform microscopic strength check; 09 Determine if the design requirements are met; if yes, jump to 12 to complete the product design; if no, jump to 10 to modify the lattice element parameters: length / thickness / lattice type; 12 Generate optimized lattice elements, and jump to 03 to check the optimized lattice elements again.

[0086] The embodiments of the present invention can perform strength verification and optimization analysis on hexahedral 3D printed lattice structures. In this method, periodic boundary conditions are used to obtain equivalent material parameters, and the strength of the lattice structure is verified by combining macroscopic and microscopic strength verification. Then, the lattice unit parameters are optimized using the strength verification results to achieve lattice structure product optimization. The calculation method of the embodiments of the present invention has low computational requirements and low convergence difficulty.

[0087] like Figure 8 As shown, this embodiment of the invention provides a strength verification device for a hexahedral 3D printed lattice structure, comprising:

[0088] The first determining module obtains the lattice structure corresponding to the target object and determines the hexahedral lattice unit from the three-dimensional model of the lattice structure.

[0089] The second determining module determines the homogenized solid structure corresponding to the hexahedral lattice unit based on the periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit.

[0090] The verification module performs strength verification on the lattice structure of the target object based on the macroscopic finite element strength analysis and the mesoscopic finite element strength analysis of the homogenized solid structure.

[0091] In some embodiments, the second determining module is further specifically configured to: calculate the equivalent material parameters of the hexahedral lattice unit based on periodic boundary conditions and the symmetry of the hexahedral lattice unit; and replace the hexahedral lattice unit with a homogenized solid structure according to the equivalent material parameters.

[0092] In some embodiments, the second determining module is further specifically configured to: determine a symmetric mesh plane based on the symmetry of the hexahedral lattice unit; and determine the equivalent material parameters of the hexahedral lattice unit by constraining the displacements of each node pair on the symmetric mesh plane through periodic boundary conditions, wherein the equivalent material parameters include area, Young's modulus, and Poisson's ratio.

[0093] In some embodiments, the second determining module is further specifically used to map the positions of each node in the hexahedral lattice to a symmetrical plane to determine a symmetrical mesh plane; or, to establish a symmetrical mesh plane based on the symmetry of the hexahedral lattice.

[0094] In some embodiments, the verification module is further specifically used to perform macroscopic finite element strength verification on the homogenized solid structure, determine the maximum strain load on the homogenized solid structure, add the maximum strain load to the unit lattice element of the homogenized solid structure, and perform microscopic strength verification on the homogenized solid structure after adding the maximum strain load.

[0095] In some embodiments, the verification module is further specifically used to correct the structural parameters of the lattice unit if either the strength value or the yield strength value of the homogenized solid structure after adding the maximum strain load does not meet the preset strength threshold range.

[0096] In some embodiments, the first determining module is further configured to: obtain the lattice structure corresponding to the target object, and perform three-dimensional modeling on the lattice structure to obtain a three-dimensional model corresponding to the target object; and determine hexahedral lattice units from the three-dimensional model.

[0097] The present invention provides an embodiment for implementing an electronic device. In this embodiment, the electronic device may be, but is not limited to, a personal computer (PC), a laptop computer, a monitoring device, a server, or other computer device with analysis and processing capabilities.

[0098] As an exemplary embodiment, see [reference]. Figure 9 The electronic device 110 includes a communication interface 111, a processor 112, a memory 113, and a bus 114. The processor 112, the communication interface 111, and the memory 113 are connected via the bus 114. The memory 113 is used to store a computer program that supports the processor 112 in executing the above-described method. The processor 112 is configured to execute the program stored in the memory 113.

[0099] The machine-readable storage medium mentioned in this article can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, etc. For example, machine-readable storage media can be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar storage media, or combinations thereof.

[0100] Non-volatile media can be non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar non-volatile storage media, or combinations thereof.

[0101] It is understood that the specific operation methods of each functional module in this embodiment can be referred to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0102] The computer-readable storage medium provided in the embodiments of the present invention stores a computer program. When the computer program code is executed, it can implement the method described in any of the above embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0103] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the system and apparatus described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0104] Furthermore, in the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0105] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0106] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A method for strength verification of a hexahedral 3D printed lattice structure, characterized in that, include: Obtain the lattice structure corresponding to the target object, and determine the hexahedral lattice unit from the three-dimensional model of the lattice structure; Based on periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit, the homogenized solid structure corresponding to the hexahedral lattice unit is determined, including: mapping the positions of each node in the hexahedral lattice to a symmetrical plane according to the symmetry of the hexahedral lattice unit to determine a symmetrical mesh plane, or directly establishing a symmetrical mesh plane; constraining the displacements of each node pair on the symmetrical mesh plane through periodic boundary conditions to determine the equivalent material parameters of the hexahedral lattice unit, the equivalent material parameters including area, Young's modulus, and Poisson's ratio; and replacing the hexahedral lattice unit with a homogenized solid structure according to the equivalent material parameters. Macroscopic finite element strength verification is performed on the homogenized solid structure to determine the maximum strain load on the homogenized solid structure; the maximum strain load is added to the unit lattice element of the homogenized solid structure, and microscopic strength verification is performed on the homogenized solid structure after adding the maximum strain load.

2. The method according to claim 1, characterized in that, The method further includes: If either the strength value or the yield strength value of the homogenized solid structure after adding the maximum strain load does not meet the preset strength threshold range, then the structural parameters of the lattice element are corrected.

3. A strength verification device for a hexahedral 3D printed lattice structure, characterized in that, include: The first determining module obtains the lattice structure corresponding to the target object and determines the hexahedral lattice unit from the three-dimensional model of the lattice structure. The second determining module determines the homogenized solid structure corresponding to the hexahedral lattice unit based on the periodic boundary conditions and the equivalent material parameters of the hexahedral lattice unit. The verification module performs macroscopic finite element strength verification on the homogenized solid structure to determine the maximum strain load on the homogenized solid structure. The maximum strain load is added to the unit lattice element of the homogenized solid structure, and the microscopic strength of the homogenized solid structure after adding the maximum strain load is checked. The second determining module is further configured to map the positions of each node in the hexahedral lattice to a symmetrical plane based on the symmetry of the hexahedral lattice unit to determine a symmetrical mesh plane, or directly establish a symmetrical mesh plane; determine the equivalent material parameters of the hexahedral lattice unit by constraining the displacements of each node pair on the symmetrical mesh plane through periodic boundary conditions, wherein the equivalent material parameters include area, Young's modulus, and Poisson's ratio; and replace the hexahedral lattice unit with a homogenized solid structure based on the equivalent material parameters.

4. An electronic device, characterized in that, It includes a memory, a processor, and a program stored in the memory and capable of running on the processor, wherein the processor executes the program to implement the method as described in any one of claims 1 to 2.

5. A computer-readable storage medium, characterized in that, The readable storage medium stores a computer program that, when executed, implements the method described in any one of claims 1-2.

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