CN114701208B - Bionic hierarchical cell structure, porous structure core, sandwich energy-absorbing structure and filling pipe energy-absorbing structure - Google Patents
Bionic hierarchical cell structure, porous structure core, sandwich energy-absorbing structure and filling pipe energy-absorbing structure Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/304—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/558—Impact strength, toughness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/56—Damping, energy absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2597/00—Tubular articles, e.g. hoses, pipes
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Abstract
The invention discloses a bionic hierarchical cell structure which is a star tetrahedron structure formed by splicing eight regular tetrahedrons, wherein the regular tetrahedron is a hollow structure formed by six edges, and the six edges of the regular tetrahedron are formed by splicing a plurality of IWP type three-cycle extremely-small curved surface sheet structures with different integrity degrees. The invention also discloses a porous structure core body which comprises the bionic hierarchical cell structure, wherein the bionic hierarchical cell structure is mirrored for multiple times along the X, Y, Z direction to obtain the porous structure core body, and the outer surfaces of the bionic hierarchical cell structures form a continuous curved surface. The invention also discloses a sandwich energy absorption structure which comprises a first interlayer, a second interlayer and the porous structure core body, wherein the porous structure core body is arranged between the first interlayer and the second interlayer. The invention also discloses a filling pipe energy absorption structure which comprises an outer pipe wall and the porous structure core body. The invention has the advantages of simple structure, high impact strength, good energy absorption effect and the like.
Description
Technical Field
The invention mainly relates to the technical field of cores, in particular to a bionic hierarchical cell structure, a porous structure core, a sandwich energy absorption structure and a filling pipe energy absorption structure.
Background
Researchers have found that there are many porous structures in nature, such as honeycombs (as shown in fig. 1), which possess excellent properties that play a crucial role in achieving biological functionality and in the proper functioning of the system. Most of porous materials are inspired by nature, or prototypes of the porous materials can be found in nature, such as a honeycomb aluminum sandwich structure, and the porous materials have the advantages of small relative density, high specific strength and specific stiffness, high energy absorption efficiency, good impact resistance, excellent damping and buffering properties, heat insulation and sound insulation properties and the like, and are ideal light structural materials. Meanwhile, researchers have observed that many bio-porous materials have developed hierarchical structures with different length scales, such as bones, teeth, shells, woods, pillars, and the like. Over millions of years of evolution, the hierarchical organization of these bio-porous materials can provide superior performance. Researches show that the hierarchical structure can obviously improve the mechanical property of the biological porous material, so researchers can hierarchy the traditional lattice structure to obtain unusual mechanical property. For example, the compression behavior of a self-similar regular graded honeycomb under axial load has better energy absorption capacity than a conventional honeycomb.
At present, various types of core bodies with sandwich structures are common at home and abroad, wherein the core bodies comprise core bodies with non-hierarchical porous structures and core bodies with hierarchical porous structures. For example, the core of the non-hierarchical porous structure has a conventional hexagonal honeycomb sandwich structure, a honeycomb-like sandwich structure with the patent application number of CN103559343A, a sandwich bulletproof sandwich structure with the patent application number of CN202742715U, and the like. The core body of the hierarchical porous structure comprises a multi-level sandwich composite structure with the patent application number of CN109483962A, a honeycomb sandwich plate with an embedded multi-level structure with the patent application number of CN109483981A and the like. These sandwich structures are primarily composed of a metal or composite sandwich and a high porosity metal core, wherein the internal core has the greatest effect on the sandwich structure performance.
With the increasing requirements of high-tech fields such as automobiles, high-speed trains, high-speed ships, aerospace aircrafts, returning cabins and the like on the light weight and high crashworthiness of the structure, the common sandwich structure at home and abroad at present has the defects of impact resistance, shock absorption and buffering and energy absorption under the condition of high-speed collision. Therefore, the development of a sandwich structure with light weight, better energy absorption effect, stronger impact resistance and more excellent mechanical property has become an urgent need in various fields at present.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a bionic hierarchical cell structure, a porous structure core and a sandwich energy absorption structure which are simple in structure, high in impact strength and good in energy absorption effect.
In order to solve the technical problem, the invention adopts the following technical scheme:
a bionic hierarchical cell structure is characterized in that eight regular tetrahedrons are spliced to form a star tetrahedron structure, each regular tetrahedron is of a hollow structure formed by six edges, and the six edges of each regular tetrahedron are spliced by IWP type three-cycle extremely-small curved surface sheet structures with different integrity degrees.
As a further improvement of the invention: the IWP type three-cycle minimum curved surface sheet structure corresponds to an implicit function as follows: phi (phi) of IWP (α,β,γ)＝-4[cos(α)cos(β)+cos(β)cos(γ)+cos(α)cos(γ)]+[cos(2α)+cos(2β)+cos(2γ)]= C, where α =2 π x, β =2 π y, γ =2 π z, C =0, where x, y, z are the coordinates of each point on the IWP-type sheet surface in the coordinate system.
As a further improvement of the invention: the IWP three-cycle minimal surface sheet structures with different integrity degrees comprise a complete IWP three-cycle minimal surface sheet structure, 7/8 parts of the complete IWP three-cycle minimal surface sheet structure and 3/4 parts of the complete IWP three-cycle minimal surface sheet structure.
The invention also discloses a porous structure core body which comprises the bionic hierarchical cell structure, wherein the bionic hierarchical cell structure is mirrored for multiple times along the X, Y, Z direction to obtain the porous structure core body, and the outer surfaces of the bionic hierarchical cell structures form a continuous curved surface.
The invention also discloses a sandwich energy absorption structure which comprises a first interlayer, a second interlayer and the porous structure core body, wherein the porous structure core body is arranged between the first interlayer and the second interlayer.
As a further improvement of the invention: the porous structural core is adhered between the first interlayer and the second interlayer.
As a further improvement of the invention: the first interlayer and the second interlayer are flat plates or curved plates or pipes.
As a further improvement of the invention: and lightening holes are formed in the first interlayer and the second interlayer.
As a further improvement of the invention: the first interlayer and the second interlayer are made of metal aluminum or aluminum alloy or stainless steel or copper or galvanized iron plate.
The invention also discloses a filling pipe energy absorption structure which comprises an outer pipe wall, wherein the porous structure core body is arranged in the outer pipe wall, and the outer pipe wall is a round pipe or a square pipe.
Compared with the prior art, the invention has the advantages that:
1. the bionic hierarchical cell structure has an obvious hierarchical form, can show excellent mechanical properties in all directions, has a light weight characteristic, and can obtain high impact strength and excellent energy absorption characteristics with low mass. The IWP type three-period extremely-small-curved-surface sheet structure has smooth and continuous surface, can provide more uniform stress distribution before local plastic deformation, reduces stress concentration, has good mechanical property and crashworthiness, and meanwhile, the pore structure of the IWP type three-period extremely-small-curved-surface sheet structure is easy to control, so that the optimal porosity under a specific working condition can be obtained conveniently.
2. The porous structure core body is formed by a plurality of bionic hierarchical cellular structures, has the characteristics of light weight, excellent energy absorption, high specific strength, high specific stiffness, excellent noise reduction, heat insulation and the like, obviously improves various performances such as mechanical property, mechanical strength, energy absorption efficiency, impact resistance and the like compared with the traditional foamed aluminum structure and honeycomb structure, and has great advantages in the field of engineering application.
3. The sandwich energy-absorbing structure adopts the method of mutually bonding the porous structure core body and the sandwich plate, has the advantages of high energy-absorbing efficiency, better heat preservation, heat insulation and sound insulation performance and the like, and can meet the requirements of engineering fields such as high-speed trains, aerospace, navigation and the like.
4. According to the filling pipe energy absorption structure, the porous structure core is arranged in the outer pipe wall, so that the filling pipe energy absorption structure also has the advantages of high energy absorption efficiency, better heat preservation, heat insulation performance and sound insulation performance and the like, and can meet the requirements of engineering fields such as high-speed trains, aerospace, navigation and the like.
Drawings
Fig. 1 is a structural view of a conventional aluminum honeycomb.
Fig. 2 is a three-dimensional schematic view of a bionic hierarchical cell structure according to the present invention.
Fig. 3 is a two-dimensional schematic plan view of a bionic hierarchical cell structure according to the present invention.
FIG. 4 is a schematic representation of an IWP three-cycle minimal surface lamina structure of varying degrees of integrity in accordance with the present invention.
Fig. 5 is a schematic structural diagram of the edges of regular tetrahedrons in the bionic hierarchical cell structure according to the present invention.
Fig. 6 is a schematic structural diagram of a regular tetrahedron in the construction of a bionic hierarchical cell structure according to the present invention.
Figure 7 is a schematic diagram of different types of bionic hierarchical cell structures in the present invention.
FIG. 8 is a schematic structural view of a sandwich energy absorbing structure according to a first embodiment of the present invention.
FIG. 9 is a schematic view of a sandwich energy absorbing structure according to a second embodiment of the present invention.
FIG. 10 is a schematic structural view of a sandwich energy absorbing structure according to a third embodiment of the present invention.
FIG. 11 is a schematic structural view of a sandwich energy absorbing structure according to a fourth embodiment of the present invention.
FIG. 12 is a schematic structural view of an energy absorbing structure of a filler tube according to a fifth embodiment of the present invention.
Fig. 13 is a partial enlarged view of a portion a in fig. 12.
FIG. 14 is a schematic structural view of an energy absorbing structure of a filler tube according to a sixth embodiment of the invention.
Illustration of the drawings:
1. a first interlayer; 2. a second interlayer; 3. a porous structural core; 31. a bionic hierarchical cell structure; 311. a complete IWP type three-cycle extremely-small curved surface sheet structure; 312. 7/8 part of the complete IWP type three-cycle minimal curve sheet structure; 313. 3/4 part of the complete IWP type three-cycle extremely-small curved sheet structure; 4. lightening holes; 5. an outer tube wall.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
Example one
As shown in fig. 2 to 8, the present embodiment discloses a bionic hierarchical cell structure, in which the bionic hierarchical cell structure 31 is a star tetrahedron structure formed by splicing eight regular tetrahedrons, each regular tetrahedron is a hollow structure formed by six edges, and the six edges of each regular tetrahedron are formed by splicing a plurality of IWP type three-cycle extremely-small curved sheet structures with different degrees of integrity.
The IWP type three-cycle minimum curved surface sheet structure has the following implicit functions: phi IWP (α,β,γ)＝-4[cos(α)cos(β)+cos(β)cos(γ)+cos(α)cos(γ)]+[cos(2α)+cos(2β)+cos(2γ)]And = C, where α =2 π x, β =2 π y, γ =2 π z, C =0, where x, y, z are coordinates of each point on the surface of the IWP-type sheet in the coordinate system, and the three-cycle infinitesimal surface is a surface where the average curvature of each point on the surface in three-dimensional space is zero.
Further, in the present embodiment, the edges of the regular tetrahedron constituting the bionic hierarchical cell structure are formed by three IWP-type three-cycle minimal curved sheet structures with different degrees of integrity, including a complete IWP-type three-cycle minimal curved sheet structure 311, a 7/8 portion 312 of the complete IWP-type three-cycle minimal curved sheet structure, and a 3/4 portion 313 of the complete IWP-type three-cycle minimal curved sheet structure.
The IWP type three-cycle minimum curved surface sheet structure formed by combining the x, y and z values of the implicit function expression has light weight and higher mechanical properties such as strength, impact resistance and the like. The IWP type three-cycle extremely-small-curved-surface sheet structure has smooth and continuous surface, can provide more uniform stress distribution before local plastic deformation, reduces stress concentration, and has good mechanical property and crashworthiness. Meanwhile, the pore structure of the IWP type three-period extremely-small curved-surface sheet structure is easy to control, and the optimal porosity under a specific working condition is convenient to obtain.
The bionic hierarchical cell structure creating method in the embodiment comprises the following steps:
firstly, splicing three IWP type three-cycle extremely-small curved surface sheet structures with different integrity into a rod-shaped hierarchical structure as the edges of a regular tetrahedron (as shown in FIG. 5);
secondly, splicing six rod-shaped hierarchical structures into a hollow regular tetrahedron structure (shown in fig. 6);
and thirdly, splicing the 8 regular tetrahedrons into a star tetrahedron structure to obtain the bionic hierarchical cell structure (as shown in fig. 2).
The upper end face, the lower end face and the peripheral end face of the bionic hierarchical cell structure can be connected in an outward extending mode. It should be noted that different types of hierarchical cell structures (as shown in fig. 7) can be created from different numbers of complete IWP-type three-cycle microform sheet structures. The following table is the impact of different numbers N of complete IWP-type three-cycle minimal surface sheet structures 311 on the rod-like hierarchy of regular tetrahedrons (i.e., the edges of the regular tetrahedrons) in the biomimetic hierarchical cell structure on their crashworthiness.
As can be seen from the results in the table, since the number N of the complete IWP type three-cycle extremely-small curved sheet structures 311 on the rod-shaped hierarchical structure is different, the parameters related to the impact resistance of the bionic hierarchical cell structure are also changed, and the higher the energy absorption is, the better the energy absorption characteristic of the structure is, and more energy can be absorbed; too high a peak force may be detrimental to the buffered target; the average compression force represents the average load in the compression process and can reflect the energy absorption performance of the structure to a certain extent; the index of the energy absorption efficiency can be used for evaluating whether the loading of the impact force is stable or not, and the higher the energy absorption efficiency is, the more stable the energy absorption process is; different types of hierarchical cell structures may be selected according to different engineering requirements.
The present embodiment further provides a porous structure core 3, the porous structure core 3 includes the bionic hierarchical cell structure 31 as described above, the bionic hierarchical cell structure 31 is mirrored for multiple times along the direction X, Y, Z to obtain the porous structure core 3, and the outer surfaces of the plurality of bionic hierarchical cell structures 31 form a continuous curved surface. The porous structure core 3 of the present embodiment has the characteristics of light weight, excellent energy absorption, high specific strength, high specific stiffness, excellent noise reduction, heat insulation, etc., and compared with the conventional foamed aluminum structure and honeycomb structure, the porous structure core has significantly improved mechanical properties, mechanical strength, energy absorption efficiency, impact resistance, etc., and has great advantages in the field of engineering application.
The embodiment also provides a sandwich energy absorbing structure, which comprises a first interlayer 1, a second interlayer 2 and the porous structure core 3, wherein the porous structure core 3 is arranged between the first interlayer 1 and the second interlayer 2.
The sandwich energy-absorbing structure of the embodiment adopts the method that the porous structure core body 3 and the sandwich plate are bonded with each other, has the advantages of high energy-absorbing efficiency, better heat insulation performance, sound insulation performance and the like, and can meet the requirements of engineering fields such as high-speed trains, aerospace, navigation and the like.
In this embodiment, the first interlayer 1 and the second interlayer 2 are flat plates, and the first interlayer 1 and the second interlayer 2 are provided with lightening holes; when the whole structure meets the energy absorption performance, the weight of the whole structure is effectively reduced by increasing the lightening holes 4 and reducing the thickness of each interlayer.
In this embodiment, the first interlayer 1 and the second interlayer 2 are made of aluminum or aluminum alloy or stainless steel or copper or galvanized iron plate.
The specific energy absorption of aluminum foam, aluminum honeycomb, a double-layer curved surface porous structure and a bionic hierarchical porous structure under different qualities is calculated through simulation by using finite element software LS-DYNA, wherein the traditional aluminum foam is made by pure aluminum foaming, the traditional aluminum honeycomb material is also pure aluminum, magnesium aluminum alloy is selected as the materials of the double-layer curved surface porous structure and the bionic hierarchical porous structure, the heights of the four configurations are 15mm, the crushing speed is 15m/s, and the compression distance is 9mm. The experimental results are as follows:
comparing the aluminum foam, the aluminum honeycomb and the bionic hierarchical porous structure, under the condition of different qualities, after the bionic hierarchical porous structure is impacted at the same speed and at the same crushing distance, the specific energy absorption of the bionic hierarchical porous structure is higher than that of the traditional aluminum foam and the traditional aluminum honeycomb. Meanwhile, compared with the existing double-layer curved surface porous structure, the bionic hierarchical porous structure has improved energy absorption. The bionic hierarchical porous structure core sandwich plate has better energy absorption characteristic than the core sandwich plate made of the traditional energy absorption material.
Example two
As shown in fig. 9, the present embodiment is substantially the same as the first embodiment, except that the first interlayer 1 and the second interlayer 2 in the sandwich energy-absorbing structure of the present embodiment are curved plates, and the porous structure core 3 is disposed between the first interlayer 1 and the second interlayer 2, so that the sandwich energy-absorbing structure of the present embodiment also has the advantages of high energy-absorbing efficiency, better thermal insulation, heat insulation, and sound insulation, and can meet the requirements of engineering fields such as high-speed trains, aerospace, and navigation.
EXAMPLE III
As shown in fig. 10, the present embodiment is substantially the same as the first embodiment, except that the first interlayer 1 and the second interlayer 2 in the sandwich energy-absorbing structure of the present embodiment are pipes, specifically, hollow circular pipe structures, and the porous structure core 3 is disposed between the first interlayer 1 and the second interlayer 2, so that the sandwich energy-absorbing structure of the present embodiment also has the advantages of high energy-absorbing efficiency, better heat preservation, heat insulation, and sound insulation, and can meet the requirements of engineering fields such as high-speed trains, aerospace, and navigation.
Example four
As shown in fig. 11, the present embodiment is substantially the same as the first embodiment, except that the first interlayer 1 and the second interlayer 2 in the sandwich energy-absorbing structure of the present embodiment are pipes, specifically, hollow square pipe structures, and the porous structure core 3 is disposed between the first interlayer 1 and the second interlayer 2, so that the sandwich energy-absorbing structure of the present embodiment also has the advantages of high energy-absorbing efficiency, better heat preservation, heat insulation, and sound insulation, and can meet the requirements of engineering fields such as high-speed trains, aerospace, and navigation.
EXAMPLE five
As shown in fig. 12 and 13, the present embodiment provides a filled tube energy absorbing structure, which includes an outer tube wall, a porous structure core 3 as described in the first embodiment is disposed in the outer tube wall, and the outer tube wall is a circular tube. Because the intussuseption of outer pipe wall is filled with the porous structure core, the filled tube energy-absorbing structure of this embodiment also has the energy-absorbing efficiently, advantages such as heat insulating ability, heat-proof quality, sound insulation performance are better.
EXAMPLE six
As shown in fig. 14, this embodiment is substantially the same as the fifth embodiment, except that the shape of the outer tube wall is the only difference, and the outer tube wall of the energy absorbing structure of the filler tube in this embodiment is a square tube structure. Because the outer pipe wall intussuseption of square pipe is filled with porous structure core 3, the filled tube energy-absorbing structure of this embodiment also has the energy-absorbing efficient, advantages such as heat insulating ability, heat-proof quality, sound insulation performance are better.
In conclusion, the porous structure core body disclosed by the invention is composed of a plurality of bionic hierarchical cell structures, so that the energy absorption efficiency of sandwich structures such as a sandwich plane plate, a sandwich curved plate and a sandwich pipe and the energy absorption structure of a filling pipe are higher, the heat preservation performance, the heat insulation performance, the sound insulation performance and the multifunctional comprehensive property are better, and the requirements of high-tech industries such as spaceflight, navigation and the like can be met.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (9)
1. A bionic hierarchical cell structure is characterized in that the bionic hierarchical cell structure (31) is a star tetrahedron structure formed by splicing eight regular tetrahedrons, each regular tetrahedron is a hollow structure formed by six edges, and the six edges of each regular tetrahedron are formed by splicing IWP type three-period minimum curved surface sheet structures with different degrees of integrity; the IWP type three-cycle minimum curved surface sheet structure corresponds to an implicit function as follows:Φ IWP (α, β, γ) = -4[cos(α)cos(β) + cos(β)cos(γ) + cos(α)cos(γ)] + [cos(2α) + cos(2β) + cos(2γ)] = Cwhereinα= 2πx, β= 2πy, γ = 2π z, C=0, whereinx、y、zIs the coordinate of each point on the IWP type sheet curved surface in the coordinate system.
2. The biomimetic hierarchical cell structure according to claim 1, wherein the IWP-type three-cycle minimal surface sheet structures of different degrees of integrity comprise a complete IWP-type three-cycle minimal surface sheet structure (311), 7/8 portions (312) of a complete IWP-type three-cycle minimal surface sheet structure, and 3/4 portions (313) of a complete IWP-type three-cycle minimal surface sheet structure.
3. A cellular structure core, comprising the biomimetic hierarchical cell structure (31) according to claim 1 or 2, wherein the biomimetic hierarchical cell structure (31) is mirrored multiple times along the X, Y, Z direction to obtain a cellular structure core (3), and the outer surfaces of the plurality of biomimetic hierarchical cell structures (31) form a continuous curved surface.
4. A sandwich energy absorbing structure, characterized in that it comprises a first sandwich (1), a second sandwich (2) and a cellular structure core (3) according to claim 3, said cellular structure core (3) being arranged between the first sandwich (1) and the second sandwich (2).
5. The sandwich energy absorbing structure according to claim 4, characterized in that the cellular structure core (3) is glued between the first sandwich layer (1) and the second sandwich layer (2).
6. The sandwich energy absorbing structure according to claim 4 or 5, characterized in that the first sandwich (1) and the second sandwich (2) are plane or curved plates or tubes.
7. Sandwich energy absorbing structure according to claim 6, wherein the first and second sandwich layers are provided with lightening holes (4).
8. Sandwich energy absorbing structure according to claim 4 or 5, wherein the first interlayer (1) and the second interlayer (2) are interlayers made of metallic aluminium or aluminium alloy or stainless steel or copper or galvanized iron sheet.
9. A filled tube energy absorbing structure, comprising an outer tube wall (5), wherein the outer tube wall (5) is internally provided with a cellular structure core (3) according to claim 3, and the outer tube wall is a round tube or a square tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210380545.4A CN114701208B (en) | 2022-04-12 | 2022-04-12 | Bionic hierarchical cell structure, porous structure core, sandwich energy-absorbing structure and filling pipe energy-absorbing structure |
Applications Claiming Priority (1)
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