CN112109398A - Bottom protection structure containing negative Poisson ratio honeycomb material - Google Patents
Bottom protection structure containing negative Poisson ratio honeycomb material Download PDFInfo
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- CN112109398A CN112109398A CN202011001829.5A CN202011001829A CN112109398A CN 112109398 A CN112109398 A CN 112109398A CN 202011001829 A CN202011001829 A CN 202011001829A CN 112109398 A CN112109398 A CN 112109398A
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- Prior art keywords
- negative poisson
- bottom plate
- honeycomb material
- sandwich layer
- protection component
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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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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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
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
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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 form; Layered products 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 form; Layered products 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 form; Layered products 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/08—Insulating elements, e.g. for sound insulation
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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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/08—Cars
Abstract
The invention belongs to the field of vehicle bottom protection, and particularly relates to a bottom protection structure made of a honeycomb material with a negative Poisson's ratio. The method comprises the following steps: a base protection component and a protection component sandwich layer; the basic protection component comprises an upper plate, a bottom plate and a fixing structure for fixing the sandwich layer of the protection component; a protective component sandwich layer: the honeycomb material with the negative poisson ratio comprises a honeycomb material with the negative poisson ratio, an upper panel arranged on the honeycomb material with the negative poisson ratio and a lower panel arranged below the honeycomb material with the negative poisson ratio; the protection component sandwich layer is fixed through the fixing structure for fixing the protection component sandwich layer by the upper panel and the lower panel. According to the protection structure, the bottom plate is designed into a trapezoidal structure, and the negative Poisson's ratio honeycomb material is arranged between the upper plate and the bottom plate to serve as a main energy absorption structure, so that impact energy generated by explosion can be effectively absorbed; the design of mutually combining the honeycomb material with the negative Poisson ratio and the sandwich lightning protection component greatly improves the energy absorption effect of the lightning protection component and better ensures the safety of passengers.
Description
Technical Field
The invention belongs to the field of vehicle bottom protection, and particularly relates to a bottom protection structure made of a honeycomb material with a negative Poisson's ratio.
Background
Military vehicles, as important strategic weapons in battlefields, have the ability of turning the war office, and in recent years, the military vehicles are often threatened by a simple explosive device (IED), and how to ensure the viability of the military vehicles and passengers in an explosive environment is an urgent problem to be solved. When special vehicles face threats such as mines, simple explosion devices and the like, the safety of passengers in the vehicles is directly influenced by the quality of the protection performance of the bottom of the vehicles. The sandwich lightning protection component is an effective explosion impact resistant structure and consists of two flat plates and a sandwich layer in the middle. The front panel can distribute the blast impact load on the crushable core layer, absorb a large amount of energy, and attenuate the shock wave. The sandwich layer is used as an important part of the sandwich lightning protection component and is a main part for absorbing explosion impact energy.
At present, most energy absorption component materials in the lightning protection component for protecting the bottom of a vehicle are regular hexagonal honeycomb aluminum, foamed aluminum, nano energy absorption materials and the like. For example, in patent CN 110823002 a, the energy-absorbing filling layer is made of aerogel, foamed aluminum, honeycomb aluminum and other buffering energy-absorbing materials; the filling material of the protective component in the patent CN206633955U is a nano energy absorbing material. However, in the process of absorbing energy, the material expands in the direction perpendicular to the external force, and when a large-equivalent explosion occurs, the energy-absorbing material expands in the direction perpendicular to the external force and thus has adverse effects on the protective assembly or the vehicle body structure.
Disclosure of Invention
The invention aims to provide a bottom protection structure containing a negative Poisson ratio honeycomb material.
The technical solution for realizing the purpose of the invention is as follows: a bottom protective structure comprising a negative poisson's ratio honeycomb material, comprising: a base protection component and a protection component sandwich layer;
the basic protection component comprises an upper plate, a bottom plate and a fixing structure for fixing the sandwich layer of the protection component;
the protective component sandwich layer: the honeycomb material with the negative poisson ratio comprises a honeycomb material with the negative poisson ratio, an upper panel arranged on the honeycomb material with the negative poisson ratio and a lower panel arranged below the honeycomb material with the negative poisson ratio;
the protection component sandwich layer is fixed through the fixing structure for fixing the protection component sandwich layer by the upper panel and the lower panel.
Furthermore, the bottom plate main part is the cross section and personally submits trapezoidal board, and the upper plate is the flat board, and the both ends fixed connection of upper plate and bottom plate forms the filling region of protection component sandwich layer between upper plate and bottom plate.
Furthermore, the upper plate and the bottom plate are made of high-strength steel, the thickness of the bottom plate is 1-3mm larger than that of the upper plate, the thickness of the upper plate is 6-10mm, and the bending part of the bottom plate is transited by a round angle.
Further, the fixing structure for fixing the protective assembly sandwich layer comprises a right channel steel, a left channel steel and an I-shaped beam, wherein the right channel steel, the left channel steel and the I-shaped beam are arranged at two ends of the upper part of the bottom plate;
right side channel-section steel and left channel-section steel opposite side fluting, protection subassembly sandwich layer includes two parts, and each part all includes negative poisson's ratio honeycomb material, top panel and lower panel, the top panel of protection subassembly sandwich layer and following integrated circuit board are established in the fluting of channel-section steel and I-beam, the height of protection subassembly sandwich layer equals right channel-section steel, left channel-section steel and the grooved internal diameter of I-beam.
Furthermore, the negative Poisson ratio honeycomb material is formed by regularly arranging a plurality of concave hexagonal cells, the upper panel and the lower panel are made of aluminum alloy, and the thickness of the upper panel and the lower panel is 1.0-1.5 mm.
Further, the lower extreme of right side channel-section steel, left channel-section steel and I-beam passes through the bolt and is connected with the bottom plate, the upper end and the upper plate contact of right side channel-section steel, left channel-section steel and I-beam, the region that the bolt passes through is equipped with the fluting on the panel down.
Further, the negative poisson's ratio honeycomb material is glued to the upper panel and the lower panel.
Furthermore, lightening holes are uniformly formed in the vertical walls of the right channel steel, the left channel steel and the I-beam; the two sides of the bottom plate are provided with flat plates for connection, and the flat plates are evenly provided with lightening holes.
Further, the height of the filling area formed by the upper plate and the bottom plate is 90-110 mm.
Compared with the prior art, the invention has the remarkable advantages that:
(1) according to the bottom protection structure containing the negative Poisson ratio honeycomb material, the bottom plate is designed to be of a trapezoidal structure, and the negative Poisson ratio honeycomb material is arranged between the upper plate and the bottom plate to serve as a main energy absorption structure, so that impact energy generated by explosion can be effectively absorbed; the negative poisson ratio honeycomb material and the sandwich lightning protection component are combined with each other to design, so that the energy absorption effect of the lightning protection component is greatly improved, and the safety of passengers is better ensured; compared with the traditional regular hexagonal honeycomb core layer, the concave hexagonal negative Poisson ratio honeycomb core layer provided by the invention has the advantages that under the same working condition and the same quality, the maximum deflection and the maximum kinetic energy of the upper plate of the concave hexagonal negative Poisson ratio honeycomb core layer are obviously reduced, and the concave hexagonal negative Poisson ratio honeycomb core layer has more excellent protection capability.
(2) According to the invention, on the premise of not changing the original lightning protection assembly, based on the original integral structure, a negative Poisson ratio honeycomb sandwich material is added between the back plate and the panel of the lightning protection assembly, and sandwich fixing pieces are added on two sides, so that the purpose of improving the protection capability of the lightning protection assembly is achieved.
(3) According to the bottom protection structure containing the negative Poisson ratio honeycomb material, the I-beam structure is added between the upper plate and the bottom plate and is connected with the bottom plate through the bolts, and the structure can ensure that the negative Poisson ratio honeycomb material is fixedly installed and can also ensure the supporting rigidity of the whole lightning protection assembly after the negative Poisson ratio honeycomb structure is instantaneously compacted under the condition of large equivalent explosion.
Drawings
Fig. 1 is a three-dimensional schematic view of the bottom protective structure of the present invention.
Fig. 2 is a schematic view of the base plate of the present invention.
FIG. 3 is a schematic structural diagram of a negative Poisson's ratio honeycomb material of the present invention.
Fig. 4 is a schematic diagram of a negative poisson's ratio cell structure according to the present invention.
Fig. 5 is a schematic view of a negative poisson's ratio honeycomb material structure fixing member of the present invention.
Description of reference numerals:
1-upper plate, 2-bottom plate, 3-right channel steel, 4-interlayer upper panel, 5-interlayer lower panel, 6-negative Poisson's ratio honeycomb material, 7-I-beam and 8-left channel steel.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in fig. 1-5, a bottom protection structure comprising a negative poisson's ratio honeycomb material comprises a bottom plate 2, wherein the bottom plate 2 is used as a foundation of a whole set of lightning protection components, and all components of the components are assembled on the basis of the bottom plate 2; the I-beam 7 is arranged in the middle of the bottom plate 2, 20 round holes are formed in the positions, corresponding to the upper end of the bottom plate 2, of the lower end of the I-beam 7, and the I-beam 7 is connected with the bottom plate 2 through bolt connection; the left channel steel 8 and the right channel steel 3 are arranged at the left and right positions of the bottom plate 2, 10 round holes are respectively formed in the corresponding positions of the lower ends of the left channel steel 8 and the right channel steel 3 and the upper end of the bottom plate 2, and the left channel steel 8 and the right channel steel 3 are connected with the bottom plate 2 through bolt connection; the sandwich upper panel 4 and the sandwich lower panel 5 are connected with the negative Poisson ratio honeycomb material structure 6 through gluing, and are in close contact with the left channel steel 8, the right channel steel 3 and the I-beam 7, so that the negative Poisson ratio honeycomb material structure 6 is fixed in the sandwich upper panel and the sandwich lower panel; the upper plate 1 is used as the uppermost end of the whole protection assembly and is connected with the bottom plate 2 through welding; the negative Poisson ratio honeycomb material structure 6 is formed by arranging concave hexagonal cells, and due to the negative Poisson ratio effect, under the explosive impact load, the negative Poisson ratio honeycomb material structure absorbs the explosive energy through the crushing deformation of the negative Poisson ratio honeycomb material structure, so that the explosive impact action is buffered, and the deformation of a vehicle body and the damage of passengers are reduced.
The protection assembly is mounted under the vehicle's underboards and when a mine buried in the soil explodes, the lightning protection assembly begins to deform. After the explosion happens, the shock wave firstly acts on the bottom plate 2, the acting force is transmitted to the I-beam 7, the left channel steel 8 and the right channel steel 3, and as the interlayer lower panel 5 is in close contact with the I-beam 7, the left channel steel 8 and the right channel steel 3, the rigidity of the I-beam 7, the left channel steel 8 and the right channel steel 3 is high, the deformation is small in the process of the impact, most of the acting force generated by the explosion acts on the interlayer lower panel 5; when the impact acting force reaches a certain limit value, the lower interlayer panel 5 deforms and drives the negative Poisson ratio honeycomb material structure 6 to deform, the center of the honeycomb core layer is compressed, and the center disconnection part has a tendency of inward contraction due to the negative Poisson ratio effect of the honeycomb material; with the continuous diffusion of the explosion shock wave, the part area under the interlayer rebounds, the edge of the honeycomb core layer far away from the explosion center also starts to be compressed, the honeycomb structures on the two sides start to contract inwards, and the negative poisson ratio honeycomb is compacted to the central loading area; subsequently, the material at the edges of the core layer shrinks rapidly inward, while the honeycomb is compressed by the peak amount in the direction of load impact and remains substantially unchanged; and finally, the compression amount of the honeycomb core layer in the load impact direction and the vertical load direction is basically kept unchanged, so that the honeycomb core layer is completely compacted, no deformable space exists in the transverse direction and the longitudinal direction, and the negative poisson ratio honeycomb material 6 completes the energy absorption process under the explosion impact. The explosion shock wave is absorbed by the energy of the honeycomb material 6 with the negative Poisson ratio, the acting force transmitted to the upper plate is greatly reduced, at the moment, the lightning protection component moves upwards locally in the explosion impact direction, when the upper plate is in contact with the bottom deck of the vehicle, the impact acting force is transmitted to the bottom deck of the vehicle by the upper plate, and the bottom deck of the vehicle begins to deform.
Claims (9)
1. A bottom protective structure comprising a negative poisson's ratio honeycomb material, comprising: a base protection component and a protection component sandwich layer;
the basic protection component comprises an upper plate (1), a bottom plate (2) and a fixing structure for fixing a protection component sandwich layer;
the protective component sandwich layer: the honeycomb material with the negative poisson ratio comprises a honeycomb material (6) with the negative poisson ratio, an upper panel (4) arranged on the honeycomb material (6) with the negative poisson ratio and a lower panel (5) arranged below the honeycomb material (6) with the negative poisson ratio;
the protection component sandwich layer is fixed through a fixing structure for fixing the protection component sandwich layer through an upper panel (4) and a lower panel (5).
2. The protective structure according to claim 1, characterized in that the main body of the bottom plate (2) is a plate with a trapezoidal cross section, the upper plate (1) is a flat plate, the two ends of the upper plate (1) and the bottom plate (2) are fixedly connected, and a filling area of the sandwich layer of the protective component is formed between the upper plate (1) and the bottom plate (2).
3. The protective structure according to claim 2, characterized in that the upper plate (1) and the bottom plate (2) are made of high-strength steel, the thickness of the bottom plate (2) is 1-3mm thicker than that of the upper plate (1), the thickness of the upper plate (1) is 6-10mm, and the bending part of the bottom plate (2) is transited by a round angle.
4. The protective structure according to claim 3, characterized in that the fixing structure for fixing the sandwich layer of the protective component comprises a right channel (3), a left channel (8) and an I-shaped beam (7) which are arranged at two ends of the upper part of the bottom plate (2), wherein the I-shaped beam (7) is arranged at the upper part of the bottom plate (2) and is positioned in the middle of the right channel (3) and the left channel (8);
right side channel-section steel (3) and left channel-section steel (8) opposite side fluting, protection subassembly sandwich layer includes two parts, and each part all includes negative poisson's ratio honeycomb material (6), top panel (4) and lower panel (5), upper panel (4) and lower panel (5) card of protection subassembly sandwich layer are established in the fluting of channel-section steel and I-beam, the height of protection subassembly sandwich layer equals slotted internal diameter of right channel-section steel (3), left channel-section steel (8) and I-beam (7).
5. Protective structure according to claim 4, wherein the honeycomb material (6) with negative Poisson ratio is formed by regularly arranging a plurality of concave hexagonal cells, the upper panel (4) and the lower panel (5) are made of aluminum alloy, and the thickness of the upper panel (4) and the lower panel (5) is 1.0-1.5 mm.
6. The protective structure according to claim 5, characterized in that the lower ends of the right channel steel (3), the left channel steel (8) and the I-shaped beam (7) are connected with the bottom plate (2) through bolts, the upper ends of the right channel steel (3), the left channel steel (8) and the I-shaped beam (7) are in contact with the upper plate (1), and a slot is formed in an area, through which the bolts pass, of the lower panel (5).
7. Guard structure according to claim 6, characterized in that said negative Poisson ratio cellular material (6) is glued to the upper (4) and lower (5) panels.
8. The protective structure according to claim 7, characterized in that lightening holes are uniformly arranged on the vertical walls of the right channel steel (3), the left channel steel (8) and the I-shaped beam (7); the two sides of the bottom plate (2) are provided with flat plates for connection, and lightening holes are uniformly formed in the flat plates.
9. Guard structure according to claim 8, characterized in that the height of the filling area formed by the upper plate (1) and the bottom plate (2) is 90-110 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011001829.5A CN112109398A (en) | 2020-09-22 | 2020-09-22 | Bottom protection structure containing negative Poisson ratio honeycomb material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011001829.5A CN112109398A (en) | 2020-09-22 | 2020-09-22 | Bottom protection structure containing negative Poisson ratio honeycomb material |
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| Publication Number | Publication Date |
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| CN112109398A true CN112109398A (en) | 2020-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011001829.5A Pending CN112109398A (en) | 2020-09-22 | 2020-09-22 | Bottom protection structure containing negative Poisson ratio honeycomb material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113343371A (en) * | 2021-01-29 | 2021-09-03 | 北京理工大学重庆创新中心 | Design method of foam-filled negative Poisson's ratio composite structure |
| CN113910636A (en) * | 2021-09-30 | 2022-01-11 | 华中科技大学 | Fiber-reinforced concave hexagonal honeycomb core and forming die and forming method thereof |
| CN114161778A (en) * | 2021-12-09 | 2022-03-11 | 昆明理工大学 | Double-arrow type negative Poisson's ratio honeycomb sandwich panel |
-
2020
- 2020-09-22 CN CN202011001829.5A patent/CN112109398A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113343371A (en) * | 2021-01-29 | 2021-09-03 | 北京理工大学重庆创新中心 | Design method of foam-filled negative Poisson's ratio composite structure |
| CN113910636A (en) * | 2021-09-30 | 2022-01-11 | 华中科技大学 | Fiber-reinforced concave hexagonal honeycomb core and forming die and forming method thereof |
| CN114161778A (en) * | 2021-12-09 | 2022-03-11 | 昆明理工大学 | Double-arrow type negative Poisson's ratio honeycomb sandwich panel |
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