Micro-curved-shell-flat-panel hybrid superstructure and lattice superstructure

Abstract

The application belongs to the technical field of engineering structure mechanics, and discloses a micro-curved shell-plate hybrid superstructure and a dot array superstructure. The superstructure comprises simple cubic cells and face-centered cubic cells, wherein the simple cubic cells and the face-centered cubic cells are hybrid, and the components of the face-centered cubic cells are connected by micro-curved shells to form face-centered cubic micro-curved shell cells. The micro-curved shell components are used to replace part of the plate components in the plate dot array supermaterial to form a micro-curved shell-plate hybrid dot array superstructure, wherein the tensile and compressive deformation and the bending deformation of the plate components are not coupled, the tensile and compressive deformation and the bending deformation of the micro-curved shell components are coupled, the introduction of the micro-curved shell can introduce small-scale bending deformation, improve the deformation stability and energy absorption characteristics of the structure, and realize the change from the tensile and compressive deformation control of the traditional plate dot array supermaterial to the tensile (compressive) and bending coupled control of the micro-curved shell-plate hybrid dot array superstructure.

Description

Technical Field

[0001] This invention belongs to the technical field of engineering structural mechanics, and more specifically, relates to a micro-curved shell-flat plate hybrid superstructure and a lattice superstructure. Background Technology

[0002] While lattice materials possess high specific stiffness and specific strength, they still have shortcomings, including: 1) severe buckling / yielding softening after large deformation, which is detrimental to energy absorption; and 2) the overall failure of lattice materials is mainly characterized by local shear bands, significantly reducing their overall deformation stability and mechanical properties. Therefore, seeking isotropic, deformation-stable, high-stiffness, high-strength, and high-energy-absorbing efficiency remains a continuous pursuit for researchers in the field of new structures and materials.

[0003] Lattice metamaterials possess the following advantages: 1) Elasticity, shear, and bulk modulus are all close to the upper limit of the Hss equation within the 50% relative density range, and they are isotropic. 2) High specific energy absorption and stable overall deformation. The plate components can bear loads in all in-plane directions and retain load-bearing capacity after buckling, which lays the foundation for the stable deformation and high specific energy absorption of lattice metamaterials. 3) Rational design can enable lattice metamaterials to also possess excellent acoustic properties. Experiments and simulations have shown that lattice-crystal composite superstructures possess both high energy absorption and high sound absorption characteristics. Although lattice metamaterials have high stiffness and high strength, they still have defects. Studies have shown that when the elastic buckling strength is much smaller than the yield strength, the failure mode of lattice metamaterials is elastic buckling, which is insensitive to initial defects of different sizes, and the post-buckling behavior is stable; as the relative density increases, its buckling or yielding failure mode exhibits strong defect sensitivity, and the strength gradually decreases with increasing defect size. Therefore, unavoidable manufacturing defects can lead to post-buckling instability in lattice metamaterials within a certain density range, affecting their mechanical properties. Summary of the Invention

[0004] To address the above-mentioned deficiencies or improvement needs of existing technologies, this invention provides a micro-curved shell-flat plate hybrid superstructure and a lattice superstructure, which solves the problems of poor structural deformation stability and energy absorption characteristics in traditional plate lattice supermaterials controlled by tensile and compressive deformation.

[0005] To achieve the above objectives, according to one aspect of the present invention, a micro-curved shell-flat plate hybrid superstructure is provided, the superstructure comprising simple cubic cells and face-centered cubic cells, wherein the simple cubic cells and face-centered cubic cells are hybridized, and the face-centered cubic cells are connected by micro-curved shell components to form face-centered cubic micro-curved shell cells.

[0006] More preferably, the simple cubic cell includes three plates in the X, Y and Z directions, and the three plates form eight uniform lattice spaces.

[0007] More preferably, the face-centered cubic cell is divided into eight parts, and the hybridization refers to the distribution of one-eighth of the face-centered cubic cells in the eight lattice spaces of the simple cubic cell.

[0008] More preferably, each corner of the superstructure has a corner opening.

[0009] More preferably, the radius of the corner opening is 0.1 to 0.3 times the size of the face-centered cubic cell.

[0010] More preferably, the hybridization refers to the arrangement of a face-centered cubic cell in each of the eight lattice spaces.

[0011] More preferably, the curvature of the micro-curved shell is 2 to 5 times the length / width / height of the face-centered cubic cell.

[0012] More preferably, the thickness of the micro-curved shell is 0.2 to 10 times the thickness of the flat plate.

[0013] According to another aspect of the present invention, a lattice superstructure formed by the superstructure described above is provided, wherein the superstructure is a single unit, and multiple units are connected to form the lattice superstructure.

[0014] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art:

[0015] 1. This invention proposes to replace some of the flat plate components in a plate lattice metamaterial with micro-curved shell components to form a micro-curved shell-flat plate hybrid lattice superstructure. In this superstructure, the tensile and compressive deformation and bending deformation of the flat plate components are not coupled, while the tensile and compressive deformation and bending deformation of the micro-curved shell components are coupled. The introduction of the micro-curved shell can introduce a small proportion of bending deformation, thereby improving the structural deformation stability and energy absorption characteristics. This transforms the traditional plate lattice metamaterial from being controlled by tensile and compressive deformation to the micro-curved shell-flat plate hybrid lattice superstructure being controlled by tensile (compression) and bending coupling.

[0016] 2. The micro-curved shell and flat plate hybrid lattice superstructure with tension (compression)-bending coupling deformation control provided by this invention adopts a hybrid form of micro-curved shell components and flat plate components. Tensile and compressive deformation and bending deformation coexist in the micro-curved shell components, while the flat plate components are controlled by tensile and compressive deformation. Therefore, the micro-curved shell-flat plate hybrid structure is controlled by tension (compression)-bending coupling deformation, and the deformation stability can be improved by introducing a small proportion of bending deformation.

[0017] 3. The micro-curved shell and flat plate hybrid lattice superstructure with tension (compression) bending coupling deformation control provided by the present invention has more stable post-buckling / yielding and higher energy absorption efficiency. It has both excellent load-bearing characteristics and high-efficiency energy absorption performance, and is suitable for impact energy absorption and protection fields. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a 1:1 single-cell superstructure constructed according to a preferred embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of a 1:8 unit cell superstructure constructed according to a preferred embodiment of the present invention;

[0020] Figure 3 This is a topological schematic diagram of four unit cell superstructures constructed according to a preferred embodiment of the present invention.

[0021] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0022] 1-Simple cubic cell, 2-Face-centered cubic cell, 3-Plate, 4-Corner opening, 5-Micro-curved shell. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] To address the shortcomings of existing plate lattice metamaterials, such as unstable post-buckling deformation due to low density or manufacturing defects, which affects mechanical properties, the present invention aims to provide a hybrid lattice superstructure of micro-curved shell and flat plate with tension (compression) bending coupling deformation control. By replacing some flat plate components with micro-curved shell components, a small proportion of bending deformation can be introduced, thereby improving the structural deformation stability and energy absorption performance.

[0025] The microcurved shell-plate hybrid superstructure comprises a simple cubic cell 1 and a face-centered cubic cell 2. The simple cubic cell 1 and the face-centered cubic cell 2 are hybridized, with the face-centered cubic cell 2 connected by microcurved shells 5, thus forming a face-centered cubic microcurved shell cell. The simple cubic cell 1 includes three plates 3 in the X, Y, and Z directions, forming eight uniform lattice spaces.

[0026] like Figure 1 As shown, the micro-curved shell and flat plate hybrid lattice superstructure with tension (compression) bending coupling deformation control provided by the present invention can be composed of a 1:1 hybridization of simple cubic cells and face-centered cubic cells. The face-centered cubic cells 2 are divided into eight parts, and one-eighth of the face-centered cubic cells 2 are distributed in the eight lattice spaces of the simple cubic cells.

[0027] like Figure 2As shown, the micro-curved shell and flat plate hybrid lattice superstructure with tension (compression) bending coupling deformation control provided by the present invention can be constructed by a 1:8 hybridization of simple cubic cells and face-centered cubic cells. Each of the eight lattice spaces contains one face-centered cubic cell.

[0028] like Figure 1 and Figure 2 As shown, corner openings 4 are made at the corners of the micro-curved shell and flat plate hybrid lattice superstructure controlled by tension (compression) and bending coupling deformation. Figure 3 As shown, the micro-curved shell and flat plate hybrid lattice superstructure unit cell provided by the present invention, which is controlled by tension (compression) and bending coupling deformation, can be periodically extended in space to form different structural forms as needed.

[0029] Preferably, the curvature of the micro-curved plates in the lattice superstructure is 2 to 5 times that of the face-centered cubic cell scale (length / width / height).

[0030] Preferably, the thickness ratio of the micro-curved shell component to the flat plate component in the lattice superstructure is 0.2 to 10.

[0031] Preferably, the radius of the corner opening 4 in the lattice superstructure is 0.1 to 0.3 times the scale (length / width / height) of the face-centered cubic cell.

[0032] In the embodiments, the micro-curved shell 5 and the flat plate hybrid lattice superstructure can be obtained by 3D printing or by casting and bonding.

[0033] Working Principle: The hybrid lattice superstructure of micro-curved shell and flat plate provided by this invention couples the tensile and compressive deformation and bending deformation of the micro-curved shell components. Unlike lattice materials and plate lattice materials, which are controlled by tensile and compressive deformation, the hybrid lattice superstructure provided by this invention introduces a small proportion of bending deformation through the micro-curved shell, which can improve the energy absorption characteristics and deformation stability of the structure while ensuring load-bearing capacity. Therefore, this invention is suitable for the field of collision and impact protection structures, and also has vibration reduction and noise reduction functions. It can be used for single-function design or as a multi-functional material. The mechanical and acoustic properties of the structure can be controlled by adjusting key design parameters such as the thickness ratio of the flat plate and micro-curved shell, the curvature of the micro-curved shell, and the size of the corner openings.

[0034] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A micro-curved shell-flat plate hybrid superstructure, characterized in that, The superstructure includes a simple cubic cell (1) and a face-centered cubic cell (2), wherein the simple cubic cell (1) and the face-centered cubic cell (2) are hybridized, and the face-centered cubic cell (2) is connected by a micro-curved shell component (5) to form a face-centered cubic micro-curved shell cell. The simple cubic cell (1) includes three plates in the X, Y and Z directions, and the three plates (3) form eight uniform lattice spaces; The face-centered cubic cell (2) is divided into eight parts, and the hybridization refers to the distribution of one-eighth of the face-centered cubic cell (2) in the eight lattice spaces of the simple cubic cell (1). The corners of the superstructure are perforated (4).

2. The micro-curved shell-flat plate hybrid superstructure as described in claim 1, characterized in that, The radius of the corner opening is 0.1 to 0.3 times the size of the face-centered cubic cell.

3. The micro-curved shell-flat plate hybrid superstructure as described in claim 1, characterized in that, The hybridization refers to the setting of a face-centered cubic cell in each of the eight lattice spaces (2).

4. The micro-curved shell-plate hybrid superstructure as described in claim 1, characterized in that, The curvature of the micro-curved shell component (5) is 2 to 5 times the length, width or height of the face-centered cubic cell (2).

5. The micro-curved shell-flat plate hybrid superstructure as described in claim 1, characterized in that, The thickness of the micro-curved shell component (5) is 0.2 to 10 times the thickness of the flat plate.

6. A lattice superstructure formed by the superstructure according to any one of claims 1-5, characterized in that, The superstructure is a single unit, and multiple units are connected to form the lattice superstructure.

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