CN111055547B

CN111055547B - Composite gradient level honeycomb-like sandwich structure

Info

Publication number: CN111055547B
Application number: CN202010022733.0A
Authority: CN
Inventors: 李响; 王艳苗; 李书璇; 曹祥斌
Original assignee: China Three Gorges University CTGU
Current assignee: China Three Gorges University CTGU
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2021-06-29
Anticipated expiration: 2040-01-09
Also published as: CN111055547A

Abstract

A composite gradient level honeycomb sandwich structure comprises a plurality of groups of cell structures, wherein the cell structures are sequentially arranged to form the honeycomb sandwich structure, each cell structure comprises a primary cell body, each primary cell body comprises a primary square cell element, and four primary hexagonal cell elements are connected in the primary square cell elements. The honeycomb structure can meet the requirement of light weight design, has good impact resistance, and widens the application field of the honeycomb sandwich structure.

Description

Composite gradient level honeycomb-like sandwich structure

Technical Field

The invention relates to a composite gradient level honeycomb-like sandwich structure.

Background

A hierarchical structure is a structure with mechanical characteristics at each level, and when a structure has mechanical characteristics at n levels, the structure is defined as an n-level hierarchical structure. If n = 0, it is considered to be continuously dense in the physical property analysis. The hierarchical structure is introduced into the light porous honeycomb structure to form the hierarchical honeycomb structure, so that the method has the advantages of improving the structural strength and the energy absorption performance; and the hierarchical honeycomb structure has good designability, and different combination types can show different mechanical properties.

Gradient structures are a new class of structures that are non-uniform and have a gradient distribution of properties or configuration along the length or thickness direction. The gradient concept is applied to the honeycomb sandwich structure, so that the elements formed by the honeycomb structure in space continuously change in a certain direction, namely, certain gradient distribution is formed, and the gradient gradual change structure is obtained. Compared with a uniform structure, the honeycomb structure with gradient change can exert greater advantages in the aspects of reducing the initial stress peak value, enhancing the shock resistance and the energy absorption capacity of the honeycomb structure and the like when the honeycomb structure is subjected to in-plane impact by selecting a proper gradient coefficient and arrangement mode. Therefore, local stress concentration is effectively reduced, and the reliability of the structure is ensured.

The porous honeycomb structure is a comprehensive structure with complexity and diversity, and in order to meet different requirements in different fields, the multifunctional easily-processed honeycomb sandwich structure is a development trend of the current society. But few have proposed the combination of a hierarchical structure with good performance in terms of structural protection and a gradient concept for simultaneous application to a honeycomb sandwich structure.

Disclosure of Invention

The invention aims to provide a composite gradient level type honeycomb sandwich structure, so that the honeycomb structure not only meets the requirement of lightweight design, but also has good impact resistance, and the application field of the honeycomb sandwich structure is widened.

In order to solve the above problems, the technical solution to be solved by the present invention is:

a composite gradient level honeycomb sandwich structure comprises a plurality of groups of cell structures, wherein the cell structures are sequentially arranged to form the honeycomb sandwich structure, each cell structure comprises a primary cell body, each primary cell body comprises a primary square cell element, and four primary hexagonal cell elements are connected in the primary square cell elements.

And a secondary cell body is arranged in the primary cell body, the secondary cell body comprises a secondary square cell element formed by enclosing the inner walls of four primary hexagonal cell elements, and four secondary hexagonal cell elements are connected in the secondary square cell element.

And a third-stage cellular body is arranged in the second-stage cellular body, the third-stage cellular body comprises a third-stage square cellular element formed by enclosing the inner walls of four second-stage hexagonal cellular elements, and four third-stage hexagonal cellular elements are connected in the third-stage square cellular element.

The invention has the technical effects that:

1. the primary square cell element is formed by optimally arranging and combining four identical hexagons and an external primary square cell element, the secondary cell element is derived from a primary cell element, the high-level structure recurs layer by layer, the overall structural characteristics can be effectively utilized in the combined honeycomb-like hierarchical structure on the basis of meeting the structural strength, the purpose of saving materials is achieved, the light-weight composite honeycomb sandwich structure is superior in performance and has good impact resistance, and the application field of the honeycomb sandwich structure is widened.

2. The different parts of the same-level structure are changed to form gradient structures by different radiuses R of the octagonal inscribed circle formed by the four hexagons, so that the bearing mechanical property of the honeycomb sandwich structure is improved, the multi-functionalization of the honeycomb sandwich structure is realized, and the application field of the honeycomb sandwich structure is widened.

3. By flexibly and reasonably designing the composite gradient level honeycomb-like sandwich structure, the impact resistance of the structure is improved, the energy absorption capacity of the sandwich is enhanced, and the damage of the structure is reduced or completely avoided.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of a primary cell body,

FIG. 2 is a schematic diagram of the structure of a secondary cell,

FIG. 3 is a schematic structural diagram of a three-level cell body,

fig. 4 is a schematic view of a honeycomb sandwich structure.

In the figure: primary square cell element 11, primary hexagonal cell element 12, secondary square cell element 21, secondary hexagonal cell element 22, tertiary square cell element 31, and tertiary hexagonal cell element 32.

Detailed Description

As shown in fig. 1 to 4, a composite gradient layered honeycomb-like sandwich structure includes a plurality of sets of cell structures, the plurality of sets of cell structures are sequentially arranged to form a honeycomb sandwich structure, the cell structure includes a primary cell unit, the primary cell unit includes a primary square cell element 11, and four primary hexagonal cell elements 12 are connected in the primary square cell element 11.

The secondary cell body is arranged in the primary cell body and comprises a secondary square cell element 21 formed by enclosing the inner walls of four primary hexagonal cell elements 12, and four secondary hexagonal cell elements 22 are connected in the secondary square cell element 21.

Three-level cell bodies are arranged in the two-level cell bodies, each three-level cell body comprises a three-level square cell element 31 formed by enclosing the inner walls of four two-level hexagonal cell elements 22, and four three-level hexagonal cell elements 32 are connected in the three-level square cell element 31.

The first-level cell unit, the second-level cell unit and the third-level cell unit are arranged from outside to inside, and the multi-level cell structure is recurred layer by layer. The bearing capacity of the honeycomb sandwich structure is changed into a controllable space variable instead of a constant value, so that the honeycomb structure not only meets the requirement of lightweight design, but also has good impact resistance, and the application field of the honeycomb sandwich structure is widened.

Claims

1. A composite gradient level honeycomb-like sandwich structure is characterized in that: the honeycomb sandwich structure comprises a plurality of groups of cell structures, wherein the plurality of groups of cell structures are sequentially arranged to form a honeycomb sandwich structure, each cell structure comprises a primary cell body, each primary cell body comprises a primary square cell element (11), and four primary hexagonal cell elements (12) are connected in the primary square cell elements (11); and a secondary cell body is arranged in the primary cell body, the secondary cell body comprises a secondary square cell element (21) which is formed by enclosing the inner walls of four primary hexagonal cell elements (12), and four secondary hexagonal cell elements (22) are connected in the secondary square cell element (21).

2. The composite gradient layered honeycomb-like sandwich structure of claim 1, wherein: and a third-level cell body is arranged in the second-level cell body, the third-level cell body comprises a third-level square cell element (31) which is formed by enclosing the inner walls of four second-level hexagonal cell elements (22), and four third-level hexagonal cell elements (32) are connected in the third-level square cell element (31).