CN115839384A - Energy absorption structure - Google Patents

Abstract

The invention relates to the field of energy-absorbing structures, in particular to an energy-absorbing structure which comprises a plurality of metal pipes and a plurality of CFRP pipes, wherein the plurality of metal pipes and the plurality of CFRP pipes are nested to form the energy-absorbing structure. In order to realize the integration of light weight, bearing and energy absorption of a thin-wall structure, metal and a CFRP pipe can be combined to form a mixed thin-wall structure, the embedded assembly mode of a plurality of layers of metal pipes and the CFRP pipe is set, the embedded mode can be uniform alternate embedding and non-uniform non-alternate embedding, and the advantages of the metal pipes and the CFRP pipe can be played.

Description

Energy absorption structure

Technical Field

The invention relates to the field of energy-absorbing structures, in particular to an energy-absorbing structure.

Background

The energy absorbing structure is a member that absorbs impact kinetic energy sufficiently by compression deformation thereof when being impacted and reduces the maximum impact force to alleviate the impact. The thin-wall energy absorption structure made of the metal material can generate progressive plastic deformation to absorb energy under axial load, has stable energy absorption characteristic, and is easy to generate the problem of overhigh peak load. With the increasing requirements on crash resistance and light weight of the energy absorption structure, a continuous fiber reinforced composite material (hereinafter referred to as CFRP) with light weight and high strength characteristics becomes one of the candidate materials for the thin-wall energy absorption structure.

The existing energy absorption structure has poor energy absorption effect and cannot meet the actual requirement.

Disclosure of Invention

The invention aims to provide an energy absorption structure, which aims to improve the energy absorption capacity.

In order to achieve the purpose, the invention provides an energy absorption structure which comprises a plurality of metal pipes and a plurality of CFRP pipes, wherein the plurality of metal pipes and the plurality of CFRP pipes are nested to form the energy absorption structure.

The specific mode that the plurality of metal pipes and the plurality of CFRP are nested to form the energy absorption structure is as follows: the metal pipes and the CFRP are sequentially and alternately nested to form an energy absorption structure.

The metal pipe is made of steel or aluminum, and the CFRP pipe is made of any one of carbon fiber, glass fiber and aramid fiber.

The energy absorption structure is provided with at least one inducing hole, and the inducing holes are distributed on the surface of the energy absorption structure and penetrate through the energy absorption structure.

When the plurality of induction holes are arranged, the sizes of the induction holes are consistent and are distributed on the energy-absorbing structure.

When the induction holes are multiple, the sizes of the induction holes are sequentially reduced and distributed on the energy absorption structure.

Wherein the energy absorbing structure further comprises a foamed aluminum layer disposed inside the energy absorbing structure.

Wherein the energy absorbing structure further comprises a corrugated sheet disposed inside the foamed aluminum layer.

According to the energy absorption structure, in order to realize integration of light weight, bearing and energy absorption of a thin-wall structure, metal and CFRP (carbon fiber reinforced plastics) pipes can be combined to form a mixed thin-wall structure, the nesting mode can be uniform alternate nesting or non-uniform non-alternate nesting by arranging a nesting assembly mode of a plurality of layers of metal pipes and CFRP pipes, and the advantages of the metal pipes and the CFRP pipes can be exerted.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a structural diagram of an energy absorbing structure according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of an energy absorbing structure according to a second embodiment of the present invention.

FIG. 3 is a structural diagram of an energy absorbing structure according to a third embodiment of the present invention.

FIG. 4 is a structural diagram of an energy absorbing structure according to a fourth embodiment of the present invention.

FIG. 5 is a structural diagram of an energy absorbing structure according to a fifth embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

First embodiment

Referring to fig. 1, fig. 1 is a structural diagram of an energy absorbing structure according to a first embodiment of the present invention. The invention provides an energy absorption structure which comprises a plurality of metal pipes 101 and a plurality of CFRP pipes 102, wherein the plurality of metal pipes 101 and the plurality of CFRP pipes 102 are nested to form the energy absorption structure.

In the embodiment, in order to realize the integration of light weight, bearing and energy absorption of a thin-wall structure, metal and the CFRP pipe 102 can be combined to form a mixed thin-wall structure, the multi-layer metal pipe 101 and the CFRP pipe 102 are arranged in a nested assembly mode, the nested mode can be uniform alternate nesting and non-uniform non-alternate nesting, and the advantages of the two can be exerted.

Second embodiment

Referring to fig. 2, fig. 2 is a structural diagram of an energy absorbing structure according to a second embodiment of the present invention. The invention provides an energy absorption structure which comprises a plurality of metal pipes 201 and a plurality of CFRP pipes 202, wherein the plurality of metal pipes 201 and the plurality of CFRP pipes 202 are nested to form the energy absorption structure. The specific manner of nesting the plurality of metal pipes 201 and the plurality of CFRP pipes 202 to form the energy absorbing structure is as follows: the metal pipes 201 and the CFRP pipes 202 are sequentially and alternately nested to form an energy absorption structure. The metal pipe 201 is made of steel or aluminum, and the CFRP pipe 202 is made of any one of carbon fiber, glass fiber and aramid fiber.

In this embodiment, the metal pipes 201 and the CFRP pipes 202 are sequentially and alternately nested to form the energy absorbing structure, so that the energy absorbing structure is more uniformly supported and distributed, and the bearing effect is better.

Third embodiment

Referring to fig. 3, fig. 3 is a structural view of an energy absorbing structure according to a third embodiment of the present invention. The invention provides an energy absorption structure which comprises a plurality of metal pipes 301 and a plurality of CFRP pipes 302, wherein the plurality of metal pipes 301 and the plurality of CFRP pipes are nested to form the energy absorption structure.

The energy-absorbing structure is provided with at least one inducing hole 303, and the inducing holes 303 are distributed on the surface of the energy-absorbing structure and penetrate through the energy-absorbing structure. When the plurality of induction holes 303 are provided, the induction holes 303 are uniform in size and distributed on the energy absorbing structure.

In this embodiment, the tube is provided with an inducing hole 303, and the design parameters of the inducing hole 303 include the position of the hole, the size of the hole, the distribution mode, and the like.

Taking the aluminum/CFRP pipe 302 as an experimental object, reserving the outer aluminum pipe wall at the mutual constraint position of the aluminum pipe and the composite material pipe, removing the aluminum pipe at the position where the aluminum pipe and the CFRP pipe 302 are not mutually constrained, setting the proportion of a central angle theta corresponding to the opening position to 360 degrees of the whole circular pipe as an opening rate alpha, and defining the proportion as the opening rate alpha by a formula

The circle center of the circular hole is located in the axial symmetry mode, the middle distance is d, the distance between the open hole and the end of the energy absorption column is c, and the radius of the circular hole is r.

When the same average crushing force is achieved, the weight and cost of each material energy absorption structure are compared with those of the open-hole hybrid tube shown in figure 3, the open-hole hybrid tube saves 25.7% of the total cost compared with a single CFRP tube 302, meanwhile, the weight is reduced by 39.2% compared with an open-hole aluminum tube, the advantages are shown, and the design requirement of load bearing/energy absorption integration can be met.

Fourth embodiment

Referring to fig. 4, fig. 4 is a structural diagram of an energy absorbing structure according to a fourth embodiment of the present invention. The invention provides an energy absorbing structure which comprises a plurality of metal pipes 401 and a plurality of CFRP pipes 402, wherein the plurality of metal pipes 401 and the plurality of CFRP pipes are nested to form the energy absorbing structure.

The energy absorbing structure has at least one induction hole 403, the induction holes 403 are distributed on the surface of the energy absorbing structure and penetrate through the energy absorbing structure. When the plurality of induction holes 403 are provided, the size of the induction holes 403 is sequentially reduced and distributed on the energy absorbing structure.

In this embodiment, by providing the inducing holes 403 with different apertures, the inducing holes 403 on the side away from the bearing end can be made smaller to provide better bearing capacity, and the inducing holes 403 on the side close to the bearing section can be made larger to save material and reduce weight, so that the use is more convenient.

Fifth embodiment

Referring to fig. 5, fig. 5 is a structural view of an energy absorbing structure according to a fifth embodiment of the present invention. The invention provides an energy absorption structure which comprises a plurality of metal pipes 501 and a plurality of CFRP pipes 502, wherein the plurality of metal pipes 501 and the plurality of CFRP pipes are nested to form the energy absorption structure.

The energy absorbing structure further comprises a foamed aluminium layer 503, the foamed aluminium layer 503 being arranged inside the energy absorbing structure. The energy absorbing structure further comprises a corrugated sheet 504, the corrugated sheet 504 being arranged inside the foamed aluminium layer 503.

In the embodiment, the cylindrical foamed aluminum material is sequentially filled into the concentric thin-walled tubes by adopting a mechanical friction method, so that the foamed aluminum is tightly contacted with the tube walls, and the stress transfer efficiency is increased. The corrugated sheet 504 is formed by stacking a first composite material thin-wall structure layer, a three-dimensional lattice structure layer and a second composite material thin-wall structure layer, and the gradient corrugated structure can optimize and promote collision overload and the energy absorption level of the whole structure.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. An energy-absorbing structure, characterized in that,

the energy absorption structure comprises a plurality of metal pipes and a plurality of CFRP pipes, wherein the plurality of metal pipes and the plurality of CFRP pipes are nested to form the energy absorption structure.

2. An energy absorbing structure according to claim 1,

the specific mode that the plurality of metal pipes and the plurality of CFRP are nested to form the energy absorption structure is as follows: the metal pipes and the CFRP are sequentially and alternately nested to form an energy absorption structure.

3. An energy absorbing structure according to claim 1,

the metal pipe is made of steel or aluminum, and the CFRP pipe is made of any one of carbon fiber, glass fiber and aramid fiber.

4. An energy absorbing structure according to claim 1,

the energy-absorbing structure is provided with at least one inducing hole, and the inducing holes are distributed on the surface of the energy-absorbing structure and penetrate through the energy-absorbing structure.

5. An energy absorbing structure according to claim 4,

when a plurality of induction holes are arranged, the induction holes are consistent in size and distributed on the energy-absorbing structure.

6. An energy absorbing structure according to claim 4,

when the induction holes are multiple, the sizes of the induction holes are sequentially reduced and distributed on the energy absorption structure.

7. An energy absorbing structure according to claim 1,

the energy absorbing structure further comprises a foamed aluminum layer disposed within the energy absorbing structure.

8. An energy absorbing structure according to claim 7,

the energy absorbing structure further includes a corrugated sheet disposed inside the foamed aluminum layer.

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