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Near-zero expansion lattice structure

A lattice structure, near-zero expansion technology, applied in the aerospace field, can solve the problems of difficult processing and mass production, difficult to control, poor characteristics, etc., to achieve easy engineering practical application, adjustable thermal expansion coefficient, simple structural design Effect

Active Publication Date: 2021-02-26
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (1) Near-zero characteristics are not good
Although the above design can achieve the change of the linear expansion coefficient of the structure from negative to positive, the design with a large control range has poor near-zero characteristics, and the design with good near-zero characteristics has problems such as difficulty in regulation.
[0010] (2) Difficulty in processing and mass production
Although the above design can achieve near-zero expansion characteristics, the design and processing of the spatial lattice structure is relatively difficult, and the sample is usually processed by additive manufacturing, but the demand for the lattice unit is large in practical applications. Manufacturing is obviously not suitable for mass production and processing, and has certain limitations

Method used

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Experimental program
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Effect test

Embodiment 1

[0052]This embodiment discloses a near-zero expansion lattice structure:

[0053] 1) A near-zero-expansion lattice structure, through the regular shape of the unit cell through such as Figure 5 The contact points 5 shown are arranged and connected, and the overall arrangement effect is as follows figure 1 shown;

[0054] 2) The unit cell includes an inner frame 2, a microstructure and an outer frame 1; the inner frame 2 and the outer frame 1 are centrosymmetric structures; the plurality of microstructures are fixed outside the inner frame 2 in a centrosymmetric manner; the The outer frame 1 places the inner frame 2 and the microstructure in it, and the unit cell structure is as follows figure 2 shown;

[0055] 3) if image 3 As shown, the microstructure is composed of a fixed load-bearing side 3 and a dynamic adjustment side 4; the fixed load-bearing side 3 is a symmetrical structure, and it is necessary to ensure that every two fixed load-bearing sides 3 are connected ...

Embodiment 2

[0061] Keep 1)~3) steps in Example 1 unchanged, get L Actuation =11mm, W R,outer Taking it as 5.5mm, and bringing the set parameters into equations (1) to (7), the linear expansion coefficient of the microstructure is calculated to be -29.8ppm. Then bring the linear expansion coefficient of the microstructure into the overall structure for simulation, and the measured linear expansion coefficient of the unit cell structure is 0.38ppm.

Embodiment 3

[0063] Keep 1)~3) steps in Example 1 unchanged, get L Actuation =13mm, W R,outer Taking it as 6.9mm, and bringing the set parameters into equations (1)~(7), the linear expansion coefficient of the microstructure is calculated to be -36.5ppm. Then bring the linear expansion coefficient of the microstructure into the overall structure for simulation, and the measured linear expansion coefficient of the unit cell structure is 0.46ppm.

[0064] In the above embodiments, the measured linear expansion coefficients of the unit cell structures are 0.23, 0.38 and 0.46, respectively. This shows that the regular arrangement of the cell junctions is as follows figure 1 For the lattice structure shown, the deformation is only 0.023mm / m, 0.038mm / m and 0.046mm / m when the temperature difference is 100 degrees Celsius. This shows that in an extreme environment, even when encountering a huge temperature difference due to environmental changes, the overall deformation of the structural parts...

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Abstract

The invention relates to a near-zero expansion lattice structure, and belongs to the field of aerospace. The invention aims to solve the problem that a spacecraft is easy to fail in the extreme environment service process, and provides a near-zero expansion lattice structure. According to the structure, common materials of a spacecraft can be selected, the structure has the near-zero expansion characteristic through a certain design, the linear expansion coefficient of the structure can reach the order of magnitude of 1 * e-7 through simulation tests, the thermal stability is good, the selected test materials are titanium alloy and aluminum alloy and are common structural materials in the spacecraft, the function is stable and reliable, and replaceability is realized. In the aspect of machining, due to the fact that the complexity of the design structure is low, the structure can be machined and manufactured through the additive manufacturing technology or the machining technology, andthe practical applicability is high.

Description

technical field [0001] The invention relates to a nearly zero-expansion lattice structure, which belongs to the field of aerospace. Background technique [0002] In recent years, composite materials with light weight, high strength, stiffness and excellent thermal properties have gradually been widely used in the aerospace field, and lattice structure materials have advantages in thermal, electrical and optical properties, as well as potential Lightweight materials have attracted attention. Therefore, in the field of aerospace, lattice structures are usually adopted for corresponding design and application. [0003] In space, due to the complex heating conditions of aircraft and the obvious changes in the heating conditions of satellites in orbit over time, they are often subject to large temperature differences in a short period of time. In the lunar environment, the temperature on the surface of the moon can vary from 93K to 395K, and due to the small rotation period of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64G1/22B64G1/66G06F30/15G06F30/23G06F113/10
CPCB64G1/22B64G1/66G06F30/15G06F30/23G06F2113/10
Inventor 郭晓岗梁博于华斌宋维力雷红帅陈明继
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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