CN-116441566-B - Hexahedral 3D printing lattice structure strength checking method and device and electronic equipment

CN116441566BCN 116441566 BCN116441566 BCN 116441566BCN-116441566-B

Abstract

The invention provides a method, a device and electronic equipment for checking the strength of a hexahedral 3D printing lattice structure, and relates to the technical field of 3D printing lattice structure checking, comprising the steps of obtaining a lattice structure corresponding to a target object, and determining a hexahedral lattice unit from a three-dimensional model of the lattice structure; determining a corresponding homogenizing entity structure of the hexahedral lattice unit based on the periodic boundary condition and the equivalent material parameters of the hexahedral lattice unit, and performing strength check on the lattice structure of the target object according to macroscopic finite element strength analysis and microscopic finite element strength analysis of the homogenizing entity structure so as to solve the technical problem that the designed 3D printing lattice product structure cannot be quickly and accurately subjected to strength check and lattice parameter optimization in the prior art.

Inventors

LI RUIZHI
JIN PING
XIE BIN
CAI GUOBIAO
HAN FANG
LIU BO

Assignees

北京航空航天大学

Dates

Publication Date: 20260505
Application Date: 20230428

Claims (5)

1. The method for checking the structural strength of the hexahedral 3D printing lattice is characterized by comprising the following steps of: Obtaining a lattice structure corresponding to a target object, and determining a hexahedral lattice unit from a three-dimensional model of the lattice structure; Based on periodic boundary conditions and equivalent material parameters of the hexahedral lattice units, determining a homogenized entity structure corresponding to the hexahedral lattice units, wherein the homogenized entity structure comprises mapping each node position in the hexahedral lattice into a symmetrical plane according to the symmetry of the hexahedral lattice units to determine a symmetrical grid plane or directly establishing the symmetrical grid plane; constraining the displacement generated by each node pair on the symmetrical grid plane through a periodic boundary condition, and determining equivalent material parameters of the hexahedral lattice unit, wherein the equivalent material parameters comprise area, young modulus and Poisson's ratio; and adding the maximum strain load into a unit lattice unit of the homogenized solid structure, and carrying out fine strength check on the homogenized solid structure added with the maximum strain load.
2. The method according to claim 1, wherein the method further comprises: And if any one of the strength value and the yield strength value of the homogenized solid structure after the maximum strain load is added does not meet the preset strength threshold range, correcting the structural parameters of the lattice unit.
3. Hexahedral 3D prints lattice structure intensity verifying attachment, its characterized in that includes: The first determining module is used for obtaining a lattice structure corresponding to the target object and determining a hexahedral lattice unit from a three-dimensional model of the lattice structure; The second determining module is used for determining a homogenizing entity structure corresponding to the hexahedral lattice unit based on a periodic boundary condition and equivalent material parameters of the hexahedral lattice unit; the verification module is used for carrying out macroscopic finite element strength verification on the homogenized entity structure, determining the maximum strain load born by the homogenized entity structure, adding the maximum strain load into a unit lattice unit of the homogenized entity structure, and carrying out microscopic strength verification on the homogenized entity structure added with the maximum strain load; the second determining module is further configured to map each node position in the hexahedral lattice into a symmetrical plane according to symmetry of the hexahedral lattice unit to determine a symmetrical grid plane, or directly establish the symmetrical grid plane, constrain displacement generated by each node pair on the symmetrical grid plane by a periodic boundary condition, determine equivalent material parameters of the hexahedral lattice unit, where the equivalent material parameters include an area, a young modulus and a poisson ratio, and replace the hexahedral lattice unit with a homogenized solid structure according to the equivalent material parameters.
4. An electronic device comprising a memory, a processor and a program stored on the memory and capable of running on the processor, the processor implementing the method of any one of claims 1 to 2 when executing the program.
5. A computer readable storage medium, characterized in that the computer program is stored in the readable storage medium, which computer program, when executed, implements the method of any of claims 1-2.

Description

Hexahedral 3D printing lattice structure strength checking method and device and electronic equipment Technical Field The invention relates to the technical field of 3D printing lattice structure checking, in particular to a hexahedral 3D printing lattice structure strength checking method, a hexahedral 3D printing lattice structure strength checking device and electronic equipment. Background In recent years, along with the rapid development of material preparation technology and equipment thereof, the metal three-dimensional lattice material prepared by the 3D printing technology is focused on various fields such as aerospace, naval vessels, biomedicine and the like, and is an advanced light high-strength multifunctional material with great potential. The titanium alloy composite material has been applied to aerospace components such as satellite heat insulation and energy storage solar panels and titanium alloy aeroengines in succession, and has excellent performances in the aspects of impact resistance, shock absorption, heat transfer, high structural rigidity, self-cooling of the structure and the like. Particularly, the light weight of the structure enables the structure to have larger specific rigidity and specific strength, and the structure is rapidly developed. However, in the current application of the 3D printing lattice structure, the actual 3D printing lattice structure is complex, and in the structural design stage, long calculation time is required, and meanwhile, the checking result is also not ideal, so that the light weight efficiency and the product reliability of the 3D printing lattice structure are greatly affected. Disclosure of Invention The invention aims to provide a hexahedral 3D printing lattice structure strength checking method, a hexahedral 3D printing lattice structure strength checking device and electronic equipment, so as to solve the technical problem that the strength checking and lattice parameter optimization work cannot be performed on a designed 3D printing lattice product structure rapidly and accurately in the prior art. In a first aspect, an embodiment of the present invention provides a method for checking the strength of a hexahedral 3D printing lattice structure, including: Obtaining a lattice structure corresponding to a target object, and determining a hexahedral lattice unit from a three-dimensional model of the lattice structure; Determining a homogenizing entity structure corresponding to the hexahedral lattice unit based on a periodic boundary condition and equivalent material parameters of the hexahedral lattice unit; And performing intensity check on the lattice structure of the target object according to the macroscopic finite element intensity analysis and the microscopic finite element intensity analysis of the homogenized entity structure. With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the step of determining, based on a periodic boundary condition and an equivalent material parameter of the hexahedral lattice unit, a homogenized entity structure corresponding to the hexahedral lattice unit includes: calculating equivalent material parameters of the hexahedral lattice unit based on periodic boundary conditions and symmetry of the hexahedral lattice unit; and replacing the hexahedral lattice unit with a homogenized entity structure according to the equivalent material parameters. With reference to the first aspect, the embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein the step of calculating the equivalent material parameter of the hexahedral lattice unit based on the periodic boundary condition and the symmetry of the hexahedral lattice unit includes: determining a symmetry grid plane according to the symmetry of the hexahedral lattice unit; And determining equivalent material parameters of the hexahedral lattice unit by restraining the displacement generated by each node pair on the symmetrical grid plane through a periodic boundary condition, wherein the equivalent material parameters comprise area, young modulus and Poisson's ratio. With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the step of determining a symmetry grid plane according to symmetry of the hexahedral lattice unit includes: mapping the positions of all nodes in the hexahedral lattice into a symmetrical plane to determine a symmetrical grid plane; Or alternatively And establishing a symmetrical grid plane according to the symmetry of the hexahedral lattice. With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the step of performing intensity check on the lattice structure of the target object according to macroscopic finite