CN110043593B

CN110043593B - Honeycomb energy absorption structure and preparation method thereof

Info

Publication number: CN110043593B
Application number: CN201910335239.7A
Authority: CN
Inventors: 吴鹤翔
Original assignee: Northeast Forestry University
Current assignee: Northeast Forestry University
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2021-05-18
Anticipated expiration: 2039-04-24
Also published as: CN110043593A

Abstract

The invention relates to a honeycomb energy absorption structure and a preparation method thereof, in particular to an energy absorption structure and a preparation method thereof, aiming at solving the problems that the existing simple energy absorption structure is limited to a single-direction design and cannot adapt to the impact condition of direction change, the complex energy absorption structure increases the difficulty of the process manufacturing flow and reduces the energy absorption capacity of unit mass, the honeycomb energy absorption structure comprises a plurality of energy absorption components, the energy absorption components are arranged side by side in parallel to form the honeycomb energy absorption structure, and the method is realized according to the following steps: the method comprises the following steps: cutting the aluminum alloy or stainless steel metal plate by a wire cutting technology, and performing the second step: sequentially cleaning, degreasing and derusting the plate and the annular pipe body cut in the step one; step three: welding a cross plate on the inner side wall of the ring body to obtain an energy absorption assembly; step four: the energy absorbing components manufactured in the third step are arranged in a rectangular shape, and the invention is used in the field of energy absorbing structures.

Description

Honeycomb energy absorption structure and preparation method thereof

Technical Field

The invention relates to an energy absorption structure and a preparation method of the energy absorption structure, in particular to a honeycomb energy absorption structure and a preparation method of the energy absorption structure.

Background

The energy absorption structure is a common safety protection device by virtue of the advantages of light weight, high specific strength, high specific stiffness, platform deformation characteristic with micro-structure elastic-plastic buckling, high energy absorption performance, simple industrial manufacturing process and the like, is widely applied to the fields of large-scale industrial engineering such as aerospace, vehicle engineering, ocean engineering and the like, avoids impact and collision accidents, and reduces or reduces casualties and property loss. Currently, cellular energy absorbing cell structures are evolving from simple quadrilateral, hexagonal and circular structures to complex rotating quadrilateral and chiral structures. These structures, while capable of controlling poisson's ratio, reduce the energy absorbing capacity per unit mass. The energy absorbing structure with a complex structure increases the difficulty of the process manufacturing flow. In addition, the gradient design is developed by adopting a simple energy absorption structure, which is often limited to a single direction and cannot adapt to the impact condition of direction change.

Disclosure of Invention

The invention provides a honeycomb energy absorption structure and a preparation method thereof in order to solve the problems that the existing simple energy absorption structure is limited to a single-direction design and cannot adapt to the impact condition of direction change, the complex energy absorption structure increases the difficulty of the process manufacturing flow, and the energy absorption capacity of unit mass is reduced,

the technical scheme adopted by the invention for solving the problems is as follows:

the energy absorption device comprises a plurality of energy absorption components, wherein each energy absorption component comprises a circular ring body and a cross plate; the cross-shaped cross plate is fixedly arranged on the inner side wall of the circular ring body, a plurality of energy absorption assemblies are arranged side by side in parallel to form a honeycomb energy absorption structure, and any two adjacent circular ring bodies are fixedly connected.

The method is realized according to the following steps:

the method comprises the following steps: cutting an aluminum alloy or stainless steel metal plate by a wire cutting technology, and cutting a metal round pipe by a machine tool;

step two: sequentially cleaning, degreasing and derusting the plate and the annular pipe body cut in the step one;

step three: welding the plate subjected to the rust removal treatment in the step two to form a cross plate, and welding the cross plate on the inner side wall of the ring body to form an energy absorption assembly;

step four: and (3) arranging a plurality of energy-absorbing components prepared in the third step in a rectangular shape, and welding and fixing the contact part of the outer side walls of any two adjacent circular ring bodies to obtain the honeycomb energy-absorbing structure.

The invention has the beneficial effects that:

1. the energy absorption assembly is formed by selecting simple structures such as the cross plate 2 and the ring body 1, so that the industrial manufacturing process is simplified, and the energy absorption assembly can adapt to extreme and complex working conditions.

2. The cross-shaped plate 2 is arranged in the ring body 1 to form an energy-absorbing assembly, and the energy-absorbing assembly is arranged together to provide a zero-Poisson-ratio energy-absorbing honeycomb structure, so that the phenomenon that the traditional energy-absorbing structure is expanded in the vertical direction to deform to cause additional damage when being compressed in a single direction is avoided.

3. The cross-shaped cross plate 2 is arranged in the ring body 1 to form an energy absorption assembly, so that the unit cell rigidity of the honeycomb structure is greatly improved, and impact compression deformation can be resisted more fully.

4. The cross-shaped cross plate 2 is arranged in the ring body 1 to form an energy absorption assembly, so that the platform bearing capacity of the honeycomb structure is greatly improved, the functional characteristics are considered, and the mechanical characteristics of the structure are optimized.

5. The cross plate 2 is arranged in the ring body 1 to form an energy absorption assembly, so that the energy absorption capacity of the honeycomb structure is greatly improved, and the protected structure can be better prevented from being damaged.

6. By controlling the thickness of the cross plate 2, the density gradient design can be simultaneously carried out in the horizontal and vertical orthogonal directions, the variable impact direction condition is adapted, and the variable impact direction condition has certain self-adaptive characteristic.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the rectangular array of the present application.

FIG. 2 is a front view of an energy absorber assembly.

FIG. 3 is a graph of energy absorption versus nominal strain on the abscissa and energy absorption per unit mass in J/g on the ordinate for a honeycomb energy-absorbing structure of the present application and a conventional annular energy-absorbing structure, wherein a represents the energy absorbed by the honeycomb energy-absorbing structure of the present application and b represents the energy absorbed by the drive annular energy-absorbing structure.

Fig. 4 is a deformation diagram of the zero poisson's ratio structure of the rectangular arrangement of the honeycomb energy-absorbing structure of fig. 1, in which expansion does not occur on the left and right sides during compression.

Fig. 5 is a gradient design of a prior art energy absorbing structure.

Fig. 6 is an adaptive density gradient honeycomb energy absorbing structure that may be further developed based on the honeycomb energy absorbing structure of the present application. The bi-directional density gradient design is achieved by varying the thickness of the cross plate 2 in the energy absorbing assembly of the honeycomb energy absorbing structure.

Detailed Description

The first embodiment is as follows: the present embodiment is described with reference to fig. 1 to 4 and 6, and the present embodiment describes a honeycomb energy-absorbing structure including a plurality of energy-absorbing components, each of which includes a torus 1 and a cross plate 2; the cross-shaped cross plate 2 is fixedly arranged on the inner side wall of the ring body 1, a plurality of energy absorption components are arranged side by side in parallel to form a honeycomb energy absorption structure, and any two adjacent ring bodies 1 are fixedly connected.

The second embodiment is as follows: referring to fig. 1 and 2, the present embodiment is described, in which a torus 1 and a cross plate 2 are made of a metal material, and other methods are the same as those of the first embodiment.

The third concrete implementation mode: in the honeycomb energy absorbing structure according to the present embodiment, the length of the torus 1 in the axial direction is equal to the length of the cross plate 2 in the longitudinal direction, which is described with reference to fig. 1 and 2. The other methods are the same as those in the first embodiment.

The fourth concrete implementation mode: referring to fig. 1 and 2, the honeycomb energy absorbing structure according to the present embodiment is described, in which the outer diameter of the torus 1 is 5mm to 20mm, and the length of the torus 1 in the axial direction is 10% to 20% of the outer diameter of the torus 1. The other methods are the same as those in the first embodiment.

The fifth concrete implementation mode: referring to fig. 1 and 2, the embodiment of the honeycomb energy absorption structure according to the present invention is described, in which the wall thickness of the torus 1 is 2% to 20% of the outer diameter of the torus 1, the width of the horizontal plate on each cross plate 2 is equal to the width of the vertical plate, and other methods are the same as those of the fourth embodiment.

The sixth specific implementation mode: referring to the embodiment described in conjunction with fig. 1 and 2, the honeycomb energy absorbing structure according to the embodiment has four side connection ends of a cross plate 2 on each energy absorbing assembly fixedly connected with the inner side wall of a torus 1. And the cross plate 2 and the ring body 1 are welded and fixed, and other methods are the same as the second embodiment.

The seventh embodiment: the present embodiment is described with reference to fig. 1 to fig. 3, and a method for manufacturing a honeycomb energy absorbing structure according to the present embodiment includes the following steps: cutting an aluminum alloy or stainless steel metal plate by a wire cutting technology, and cutting a metal round pipe by a machine tool;

step three: welding the plate subjected to the rust removal treatment in the step two to form a cross plate 2, and welding the cross plate 2 on the inner side wall of the ring body 1 to form an energy absorption assembly;

step four: and (3) arranging a plurality of energy-absorbing components prepared in the third step in a rectangular shape, and welding and fixing the contact part of the outer side walls of any two adjacent circular ring bodies 1 to obtain the honeycomb energy-absorbing structure.

The specific implementation mode is eight: the method for manufacturing the honeycomb energy absorption structure is described with reference to fig. 1, fig. 4 and fig. 6, the cross plate 2 and the torus 1 in each energy absorption assembly in the third step are welded and fixed by brazing or laser welding, the contact part of the outer side walls of the two tori 1 in the fourth step is welded and fixed by brazing or laser welding, and other methods are the same as those in the seventh embodiment.

The specific implementation method nine: taking the structure diagram of the energy absorption of the hollow tube honeycomb of fig. 5 as an example, the density is defined as the solid mass to total volume. The honeycomb energy absorption structure with the same structure type has certain energy absorption capacity when the density is constant. The density gradient can be designed by changing the local density. As shown in FIG. 5, the model can be divided into 3 parts, and by changing the outer diameter of the circular ring, the density of the upper part is small, the density of the lower part is large, and a density gradient design is formed from top to bottom. The density gradient design can meet the requirement of total energy absorption and simultaneously gain mechanical property, and the functional characteristics of more energy absorption in the early stage and low load bearing of the protected end are realized. However, the traditional gradient design can only be along one direction, and cannot meet the changing impact direction, and the impact is not always along the direction from top to bottom in the model. When the impact direction is from left to right, the density of the model from left to right in fig. 5 is uniform, and the density gradient design loses effect. The present application therefore develops a bi-directional orthogonal density gradient design in fig. 6. The density gradient design is realized by changing the plate thickness in the horizontal direction and the vertical direction. There is a density gradient design for the model in the direction of impact, regardless of the direction in which the impact is directed.

Claims

1. A honeycomb energy absorbing structure comprising a plurality of energy absorbing assemblies, characterized in that: each energy absorption assembly comprises a ring body (1) and a cross plate (2); ' cross board (2) fixed mounting is on the inside wall of tourus (1), honeycomb energy absorption structure is constituteed to a plurality of energy-absorbing component parallel arrangement side by side, and arbitrary two adjacent tourus (1) fixed connection, tourus (1) are equal along length direction ' cross board (2) along length direction ' length along axial direction's length, four side link ends and the inside wall fixed connection of tourus (1) of ' cross board (2) on every energy-absorbing component, tourus (1) and ' cross board (2) are metal material and make, the thickness of ' cross board (2) in the energy-absorbing component of honeycomb energy absorption structure is changed, the impact direction all has density gradient.

2. The honeycomb energy absorbing structure of claim 1, wherein: the outer diameter of the torus (1) is 5mm-20mm, and the length of the torus (1) along the axial direction is 10% -20% of the outer diameter of the torus (1).

3. The honeycomb energy absorbing structure of claim 2, wherein: the wall thickness of the circular ring body (1) is 2% -20% of the outer diameter of the circular ring body (1), and the width of the transverse plate on each cross plate (2) is equal to that of the vertical plate.

4. A method of making a honeycomb energy absorbing structure according to claim 1, 2 or 3, characterized in that: the method is realized according to the following steps:

step three: welding the plate subjected to the rust removal treatment in the step two to form a cross plate (2), and welding the cross plate (2) on the inner side wall of the ring body (1) to form an energy absorption assembly;

step four: and (3) arranging a plurality of energy-absorbing components prepared in the third step in a rectangular manner, and welding and fixing the contact parts of the outer side walls of any two adjacent circular rings (1) so as to obtain the honeycomb energy-absorbing structure.

5. The method of making a honeycomb energy absorbing structure of claim 4, wherein: the cross plate (2) and the circular ring body (1) in each energy absorption assembly in the third step are welded and fixed through brazing or laser welding, and the contact part of the outer side walls of the two circular ring bodies (1) in the fourth step is welded and fixed through brazing or laser welding.