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Three-dimensional developable surface adaptive lattice structure and its preparation method

A lattice structure, self-adaptive technology, applied in the field of lattice structure, can solve problems such as mechanical properties decline, size effect, etc., to achieve the effect of expanding the design and application space

Active Publication Date: 2022-03-04
INST OF MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a three-dimensional developable curved surface self-adaptive lattice structure and its preparation method, for the first time release the degree of freedom of rotation between lattice sandwich cells, and realize the self-adaptive conformal shape of a lattice sandwich three-dimensional developable curved surface , to solve the problems caused by the degradation of mechanical properties after assembly and the size effect of the lattice sandwich structure in the prior art

Method used

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  • Three-dimensional developable surface adaptive lattice structure and its preparation method
  • Three-dimensional developable surface adaptive lattice structure and its preparation method
  • Three-dimensional developable surface adaptive lattice structure and its preparation method

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Embodiment 1

[0054] like image 3 As shown, a schematic diagram of the lattice sandwich layer in the evolution process of the tunable density pyramid multicellular chain, tunable density cylindrical shell sandwich and arbitrary 3D developable surface self-adaptive sandwich prepared based on interlocking-hinge is provided.

[0055] Firstly, 10 pyramidal lattice twin cells were prepared by interlocking-hinge method, and the cells were connected by a non-linear hinge structure. By adjusting the angles of the connecting rods of the hinge structure, the line shape formed by the innermost pins and inner nodes of the cell coincides with the line shape of the inner surface shell, and the corresponding lattice cylindrical shell can be formed at this time; further, adjust the hinge The angle of the connecting rods in the machine structure increases the angle formed by the inner node and the pin, and the area enclosed by the formed line increases. At this time, the relative density of the pyramid lat...

Embodiment 2

[0058] Figure 4 An octahedral origami metamaterial prepared based on interlock-hinge is presented. If PloyJet3D printing technology is used, lattice octahedral lattice cells are prepared by interlocking-assembly method. Arrange the unit cells in a two-dimensional plane to form a 3×5 multi-cell lattice. The cells are connected by printed pins. Due to the release of the degree of freedom of rotation, the formed multicellular structure can be transformed through the hinge mechanism to form an overall folding effect. Since the connection of nodes common to both directions is released, the structure as a whole has foldable directions in both directions.

Embodiment 3

[0060] according to Figure 5-2 and Figure 5-4 Two connection methods are used to prepare a complete octahedral lattice sandwich panel and a pyramidal lattice sandwich panel. There are corresponding grooves and margins on the panel to match the dot matrix sandwich, and a certain hollowing process is done to reduce the quality of the consumables used and the overall structure. Finally, an octahedral lattice sandwich plate and a pyramid lattice sandwich plate with a relative density of about 2%-2.3% and different connection modes are formed by assembling.

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Abstract

The invention discloses a three-dimensional expandable curved surface self-adaptive lattice structure and a preparation method thereof, which releases the degree of freedom of rotation between lattice sandwich cells for the first time. The three-dimensional developable surface adaptive lattice structure includes at least one row of cell chains, the cell chain includes a plurality of cells, two adjacent cells are hinged to each other, and the cells are hollow octahedrons Lattice configuration or a hollowed-out pyramid lattice configuration; when the number of columns of the cell chain is not less than two, the adjacent two cell chains are arranged in parallel, and the phase The two adjacent cell chains are hinged to each other. This new interlock-hinge method realizes the shape-adaptive self-adaptation of the three-dimensional developable surface of the lattice sandwich, and uses the rotation of the hinged part to solve the problems of the core mismatch and the decrease in mechanical properties after assembly of the lattice sandwich structure in the prior art. The problem with size effects.

Description

technical field [0001] The invention relates to a lattice structure, in particular to a three-dimensional developable curved surface self-adaptive lattice structure and a preparation method thereof. Background technique [0002] The lattice sandwich structure integrates a variety of excellent performances, and has been put into use in major structures such as rocket support chambers, satellite force-bearing chambers and adapters, and deep-sea submarine pressure chambers. The diversity of basic unit topological configurations of lattice sandwiches, the properties of the base material, relative density, and various complex factors that may affect the final structural properties all pose challenges to the preparation process. [0003] The traditional preparation process needs to design and fix the shape of the sandwich core according to the structural shape of the cladding inner and outer shells determined first. During the molding process, minor production errors, assembly err...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B3/12B32B33/00B29C64/118B33Y10/00B33Y80/00
CPCB32B3/12B32B33/00B29C64/118B33Y10/00B33Y80/00B32B2307/50B32B2307/732
Inventor 宋宏伟康帅刘文峰袁武
Owner INST OF MECHANICS CHINESE ACAD OF SCI