Three-period minimal curved surface variable density lattice structure design method for additive manufacturing

A technology of minimal curved surface and lattice structure, which is applied in the field of three-period minimal curved surface variable density lattice structure design in additive manufacturing, can solve problems such as low efficiency and unstable topological structure values, so as to improve structural strength, solve Numerical instability of topological structure, effect of improving structural strength and specific stiffness

Active Publication Date: 2020-12-04
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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  • Three-period minimal curved surface variable density lattice structure design method for additive manufacturing
  • Three-period minimal curved surface variable density lattice structure design method for additive manufacturing
  • Three-period minimal curved surface variable density lattice structure design method 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: Figure 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. ...

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Abstract

The invention provides a three-period minimal curved surface variable density lattice structure design method for additive manufacturing. The method comprises the following steps: firstly, establishing an elastic structure finite element model based on an elastic structure static balance theory and a unit 'birth and death' technology, and designing a structure unit bearing capacity extraction method; then, obtaining structural unit bearing capacity vector data and structural finite element model unit node data through calculation, and giving a structural unit bearing capacity cloud chart; then, processing the bearing capacity data of the structural unit, including curved surface interpolation, spline interpolation and normalization, and combining the processed bearing capacity data of thestructural unit with a TPMS function; then, serving the porosity of the TPMS porous structure as an evaluation index of the variable density lattice structure, and achieving TPMS variable density curved surface modeling through a March cubes algorithm; and finally, performing Boolean operation on the TPMS variable-density curved surface model and the original structure model to realize curved surface sealing. According to the invention, the problems of unstable topological structure numerical value, low efficiency and the like in the traditional lattice structure design are solved.

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 Applications(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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