Variant gradient lattice structure based on additive manufacturing

A lattice structure and additive manufacturing technology, applied in the field of lattice structures, can solve the problems affecting the bearing characteristics of the overall structure, prominent stress concentration effect of nodes, large size differences, etc., and achieve excellent mechanical properties, strong achievability, The effect of excellent energy absorption capacity

Active Publication Date: 2022-07-08
CHONGQING UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large size difference of different layers of the structure, it not only puts forward requirements for manufacturing and processing, but also causes the structure to fail under a certain impact. Therefore, the patent "CN109163212" proposes a gradient lattice structure with a transition layer. However, this structure has the problem of node connection weakening that is common in gradient lattice structures, especially at the intersection of rods of different diameters
Under load, the joint stress concentration effect is prominent, which greatly affects the load-bearing characteristics of the overall structure

Method used

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  • Variant gradient lattice structure based on additive manufacturing
  • Variant gradient lattice structure based on additive manufacturing
  • Variant gradient lattice structure based on additive manufacturing

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Embodiment 1

[0026] This embodiment discloses a unidirectional variant gradient lattice structure, which, on the basis of the traditional uniform lattice structure, extends the size of the unit cells to form a series of new unit cells with different topologies and relative densities, and then They are periodically arranged to form different layers, and finally combined to form a gradient structure with density gradient characteristics. Since this kind of gradient structure only changes the size of the unit cell, the rod diameter does not change, which makes the connection between different layers of the structure more stable, solves the problem of weakening of the connection of the traditional gradient structure, and improves the bearing capacity of the structure. The unique high energy absorption capacity of the gradient structure provides a reference for the design of protective devices with excellent impact resistance characteristics.

[0027] like figure 1 , the common BCC structure i...

Embodiment 2

[0032] Further, through the multi-directional variant design of the structure, more and more complex gradient structures can be designed, and the node connection is stable and reliable, and the node connection problem of different layers of the existing gradient structure is solved. In addition, using the high degree of freedom design advantage of additive manufacturing technology, the structure is designed with multi-directional variants, and the obtained multi-directional variant radially gradient structure provides a new reference for the biomimetic design of bone implants. like Figure 7 ,8,9, the variant gradient lattice structure includes four variant gradient lattice layers that are repeatedly stacked and interconnected; each variant gradient lattice layer includes twenty-four variants that are repeatedly arranged and interconnected Gradient unit cell column; each variant gradient unit cell column includes four lattice cells that are repeatedly arranged and interconnect...

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Abstract

The invention discloses a variant gradient lattice structure based on additive manufacturing, which includes a plurality of variant gradient lattice layers that are repeatedly stacked and connected to each other; the variant gradient lattice layer includes a plurality of variant gradient lattice layers that are repeatedly arranged and interconnected. A body gradient unit cell array; the variant gradient unit cell array includes a plurality of lattice unit cells that are repeatedly arranged and interconnected in a single direction; the lattice unit cells are carried out in one or more directions from the original lattice unit cells The size is extended and formed; the lattice structure of the present invention improves the structural mutation problem at the connection of the existing gradient structure. While ensuring its high-strength bearing capacity, it improves its energy absorption capacity, so that it has better impact resistance properties.

Description

technical field [0001] The invention relates to a lattice structure, in particular to a gradient lattice structure for additive manufacturing and a design method thereof. The structure is stable in connection, has a mechanical response different from the traditional lattice structure, and has the advantages of high strength, high stiffness and excellent energy absorption capacity. Background technique [0002] Lattice structure plays an important role in the lightweight design of aerospace, automobile and other fields due to its advantages of light weight, high specific strength and high specific stiffness. However, the complex internal microstructure of lattice structures poses a great challenge to traditional fabrication processes. With the development of additive manufacturing technology, it has become a trend to apply it to the fabrication of lattice structures. It can not only ensure the precision and forming quality of the internal complex microstructure, but also eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16F7/00F16S5/00
CPCF16F7/00F16S5/00F16F2230/32Y02P10/25
Inventor 柏龙龚程陈晓红张俊芳周晓霞孙园喜彭艳罗均蒲华燕谢少荣
Owner CHONGQING UNIV
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