Design method of variable-density lattice structure with three-period minimal curved surface for additive manufacturing

A technology of extremely small curved surface and lattice structure, applied in the field of three-period minimal curved surface variable density lattice structure design field of additive manufacturing, can solve the problems of low efficiency and numerical instability of topological structure, so as to improve the structural strength and improve the Variable density lattice structure strength, to achieve the effect of light weight

Active Publication Date: 2022-03-15
YANSHAN UNIV
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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a three-period minimum surface variable density lattice structure design method for additive manufacturing, mainly to provide a new idea for structural lightweight design and solve the problem of traditional lattice structure design. In order to solve the problems of numerical instability and low efficiency in the topological structure, introduce the unit bearing capacity to guide the variable density change of the lattice material, introduce the three-period minimal surface as the lattice cell structure, and use the additive manufacturing technology as the manufacturing method to realize the structure Lightweight design of lattice structure

Method used

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  • Design method of variable-density lattice structure with three-period minimal curved surface for additive manufacturing
  • Design method of variable-density lattice structure with three-period minimal curved surface for additive manufacturing
  • Design method of variable-density lattice structure with three-period minimal curved surface for additive manufacturing

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Embodiment 1

[0091] Taking a rectangular plate with a length of 100 mm and a width of 50 mm as an example, the restraint load is as follows: figure 2 shown.

[0092] The specific operation steps are as follows:

[0093] S1. Establish a finite element model of a rectangular flat elastic structure, divide the mesh size into 5mm×5mm, and apply constraints and loads.

[0094] S2. Based on the static balance principle of elastic structure and the "life and death" state technology of the unit, design the method of extracting the bearing capacity of the unit;

[0095] S21. Determine the load boundary and constraint boundary of the elastic continuum, and calculate the anti-support force f of the constraint boundary i and the nodal displacement δ at the load boundary 1 ;

[0096] S22. Remove the attention area of ​​the elastic continuum, and set the load boundary by node displacement δ 1 load, and calculate the constraint boundary anti-support force at this time again as

[0097] S23. The ...

Embodiment 2

[0110] Taking a cuboid with a length of 100mm, a width of 50mm, and a height of 25mm as an example, the restraint load is as follows: Image 6 shown.

[0111] The specific operation steps are as follows:

[0112] S1. Establish the finite element model of the cuboid elastic structure, divide the mesh size into 5mm×5mm×5mm, and apply constraints and loads.

[0113] S2. Based on the static balance principle of elastic structure and the "life and death" state technology of the unit, design the method of extracting the bearing capacity of the unit;

[0114] S21. Determine the load boundary and constraint boundary of the elastic continuum, and calculate the anti-support force f of the constraint boundary i and the nodal displacement δ at the load boundary 1 ;

[0115] S22. Remove the attention area of ​​the elastic continuum, and set the load boundary by node displacement δ 1 load, and calculate the constraint boundary anti-support force at this time again as

[0116] S23. T...

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Abstract

The invention provides a method for designing a three-period minimum curved surface variable-density lattice structure for additive manufacturing. Firstly, based on the elastic structure static balance theory and unit "life and death" technology, the finite element model of the elastic structure is established, and the extraction method of the structural unit bearing capacity is designed; then, the vector data of the structural unit bearing capacity and the unit node data of the structural finite element model are calculated, And give the bearing capacity cloud diagram of the structural unit; then, process the bearing capacity data of the structural unit, including surface interpolation, spline interpolation and normalization, combine the processed bearing capacity data of the structural unit with the TPMS function; then, combine the TPMS The porosity of the porous structure is used as the evaluation index of the variable density lattice structure, and the Marching cubes algorithm is used to realize the modeling of the TPMS variable density surface; finally, the Boolean operation is performed on the TPMS variable density surface model and the original structure model to realize the surface closure. The invention solves the problems of numerical instability and low efficiency of the topological structure existing in the design of the traditional lattice structure.

Description

technical field [0001] The invention relates to the fields of computer-aided design and additive manufacturing, in particular to a method for designing a three-period minimal curved surface variable-density lattice structure for additive manufacturing. Background technique [0002] The lattice structure has excellent mechanical properties and is widely used in aerospace, automotive and biomedical fields. With the rapid development of additive manufacturing technology, the lightweight design, manufacture and application of lattice structures are developing rapidly. In the actual production process, each area of ​​the mechanical structure usually bears different loads, and the traditional lattice structure design is based on uniform size unit cells. This kind of equal-density lattice structure has the problem that the material properties cannot be fully utilized. [0003] In order to improve the utilization rate of materials, more materials can be allocated to areas with grea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06T17/20G06F111/04G06F113/10G06F119/14
CPCG06F30/23G06T17/20G06F2111/04G06F2113/10G06F2119/14
Inventor 吴凤和杨成龙王朝华郭保苏
Owner YANSHAN UNIV
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