CN114536888A - Penetration-resistant composite protection structure with ballistic deflection and preparation method thereof - Google Patents

Penetration-resistant composite protection structure with ballistic deflection and preparation method thereof Download PDF

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Publication number
CN114536888A
CN114536888A CN202210239021.3A CN202210239021A CN114536888A CN 114536888 A CN114536888 A CN 114536888A CN 202210239021 A CN202210239021 A CN 202210239021A CN 114536888 A CN114536888 A CN 114536888A
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penetration
negative poisson
concrete
steel plate
polyurea
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CN114536888B (en
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马钢
张佳寅
李国强
张周
高松涛
郭栋才
高炳婧
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Taiyuan University of Technology
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Taiyuan University of Technology
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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
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • B32B15/043—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 of metal
    • 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
    • B32B3/02—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 features of form at particular places, e.g. in edge regions
    • B32B3/08—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 features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • 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
    • B32B3/26—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 particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/28—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 particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer comprising a deformed thin sheet, i.e. the layer having its entire thickness deformed out of the plane, e.g. corrugated, crumpled
    • 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
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/04—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against air-raid or other war-like actions
    • E04H9/06—Structures arranged in or forming part of buildings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
    • E04H9/04—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate against air-raid or other war-like actions
    • E04H9/10—Independent shelters; Arrangement of independent splinter-proof walls
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • 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
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • 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
    • 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
    • B32B2571/00—Protective equipment
    • B32B2571/02—Protective equipment defensive, e.g. armour plates, anti-ballistic clothing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

Abstract

The invention belongs to the technical field of building protective structures, and relates to a penetration-resistant composite protective structure with ballistic deflection and a preparation method thereof; comprises a negative Poisson ratio cell structure; a part of cavities of the negative Poisson ratio cell structure are filled with a first filling body with the function of changing penetration direction dispersion impact performance, and the rest cavities are filled with a second filling body; the first filling body consists of a polyurea layer and self-compacting concrete; the polyurea layer is arranged along the inner wall of the cavity and has an inclination relative to the inner wall, and the self-compacting concrete is filled in the cavity provided with the polyurea layer; the second filling body is homogeneous foam concrete; the invention further improves the protection level of the structure; the ductility of the steel plate and the compression resistance of the concrete are fully utilized by constraining the concrete through the negative poisson structure; effectively weaken armor-piercing bullet energy, realize the trajectory and deflect, avoid armor-piercing bullet to a certain extent directly to punch through concrete protective structure.

Description

Penetration-resistant composite protection structure with ballistic deflection and preparation method thereof
Technical Field
The invention belongs to the technical field of building protective structures, and relates to a penetration-resistant composite protective structure with ballistic deflection and a preparation method thereof.
Background
The major reasons for the great harmfulness and severity of explosion and high-speed impact accidents are that the explosion accidents or impact accidents have short occurrence time, suffer from very large impact load and change very quickly, and effective countermeasures are difficult to take to reduce the injuries. Based on this, the performance requirements of the related art on the protective materials are higher and higher. Particularly, in the fields of airplane impact, ballistic penetration, conventional weapon explosion, gas explosion, traffic engineering and the like, a single homogeneous material and a single structure are heavy and inconvenient to use, and the contradiction between high strength and high toughness cannot be solved, so that the requirements of people cannot be met for a long time.
In military engineering, on the aspect of researching penetration of armor-piercing projectile to concrete, in order to effectively reduce impact kinetic energy of armor-piercing projectile, a protective structure capable of efficiently resisting penetration is urgently needed to be developed. In the conventional method, the traditional method is mainly realized by high-strength materials, so that a large amount of material resources are occupied, and war preparedness benefit, social benefit and economic benefit are lacked.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a penetration-resistant composite protection structure with ballistic deflection and a preparation method thereof, so as to effectively weaken the energy of armor-piercing bullets and realize ballistic deflection. The armor piercing bomb is prevented from directly piercing the concrete protection structure to a certain extent.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A composite protective structure resistant to penetration and having ballistic deflection comprises a negative Poisson ratio cell structure; a part of cavities of the negative Poisson ratio cell structure are filled with a first filling body with a function of changing penetration direction dispersion impact performance, and the other cavities are filled with a second filling body; the first filling body consists of a polyurea layer and self-compacting concrete; the polyurea layer is arranged along the inner wall of the cavity and has an inclination, and the self-compacting concrete is filled in the cavity provided with the polyurea layer; the second filler is homogeneous foam concrete.
Preferably, the negative poisson's ratio cell structure is a concave hexagon structure.
Preferably, the negative poisson's ratio cell structure is made of a steel plate.
Preferably, the polyurea layer on the upper wall and the lower wall of the cavity has a slope, and the polyurea layer on the rest side walls is arranged along the side walls.
Preferably, the polyurea layer arranged on the upper wall and the lower wall is in an axisymmetric structure.
Preferably, the inclination is an included angle of 5-15 degrees with the horizontal plane.
Preferably, the cavity filled with the second filling body is located above the cavity filled with the first filling body.
Preferably, the upper and lower surfaces of the negative poisson's ratio cell element structure are provided with steel plate covers.
Preferably, a positioning base is arranged at the bottom of the steel plate buckle cover on the lower surface of the negative Poisson ratio cell structure.
A method of making a composite protective structure that is resistant to penetration and has ballistic deflection, comprising the steps of:
1) continuously bending the steel plate by a certain angle through steel plate processing equipment;
2) and spraying a polyurea layer on the processed steel plate.
3) Overlapping the two processed steel plates by using glue to form a negative poisson ratio structure;
4) respectively pouring self-compacting concrete and changing and homogenizing foam concrete;
preferably, steel plate buckle covers are adhered to the lower two sides of the structure after the step 4) to form an integral structure; the protective structure is fixed on the base by bolts.
Compared with the prior art, the invention has the following beneficial effects:
1. when the steel plate with the negative Poisson ratio structure is impacted by the projectile, the concrete is gathered inwards, the instantaneous density is increased, the high strength is shown, and the performance of the concrete material is fully utilized.
2. The polyurea-coated negative poisson ratio structural cell element has a thicker polyurea layer on the left side and a thinner homogeneous concrete layer, so that the deflection of the armor-piercing projectile in the ballistic trajectory of the structure can be guided, and the aim of reducing the energy of the armor-piercing projectile is fulfilled.
3. The negative Poisson ratio cell structure can realize larger compression deformation, so that the negative Poisson ratio cell structure has higher energy absorption efficiency; the characteristics of impact resistance and good flexibility of the polyurea material are combined, so that the penetration resistance of the structure is improved.
4. The novel penetration-resistant protective structure for realizing ballistic deflection can be applied to the whole of a structural member; it can also be used for parts of the construction, the rest being still ordinary monolithic concrete. Compared with the traditional concrete protection structure, the invention obviously improves the energy of the weakened projectile body and avoids the deviation from a hitting target caused by directly hitting through the concrete. And the structure has low manufacturing cost and uncomplicated process, is suitable for factory prefabrication, and can be used for a composite concrete protective structure with the function of resisting high-speed impact in actual engineering.
5. And the multiple layers of negative poisson ratio structures are staggered, superposed and laid to serve as a framework inside the concrete. Polyurea is sprayed inside part of the structural cells with the negative Poisson ratio, the polyurea at the top end and the bottom end forms a certain slope to guide the ballistic trajectory of the armor-piercing projectile, and the interior is poured by self-compacting concrete. And filling the interiors of the rest negative Poisson ratio structure cells which are not coated with polyurea with foam concrete to form an integral structure. The protective structure has the capability of resisting high-speed impact, and can realize the deflection of a trajectory. The invention can be used for engineering practice and has a protection structure with low cost and simple process.
Drawings
FIG. 1 is a schematic view showing the width and angle of the steel sheet processing fold in the example;
FIG. 2 is a schematic view of the position of spraying polyurea before the steel plate is subjected to folding processing in the embodiment;
FIG. 3 is a schematic structural diagram of a polyurea-coated steel plate processed by a bending machine in the example;
FIG. 4 is a schematic view of a structure in which the steel plates shown in FIG. 3 are assembled;
FIG. 5 is a schematic view of the structure of FIG. 4 after pouring of foam concrete;
FIG. 6 is a schematic view of the structure of FIG. 5 after pouring self-compacting concrete;
FIG. 7 is a schematic structural view of two steel plates attached to the steel plate of FIG. 6;
FIG. 8 is a schematic view of the structure after the base is installed in FIG. 7;
in the figure, 1 is a negative poisson's ratio steel plate tensile layer, 2 is a polyurea deflection layer, 3 is a self-compacting concrete compressive layer, 4 is a foam concrete deflection layer, 5 is a steel plate buckle cover, 6 is a positioning base, 7 is a steel plate, 8 is polyurea, 9 is a negative poisson's ratio cell element without polyurea, and 10 is a negative poisson's ratio cell element with polyurea.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
Example 1
The utility model provides a novel combined type concrete protective structure, includes location base 6, steel sheet buckle closure 5, foam concrete deflection layer 4, self-compaction concrete compressive layer 3, polyurea deflection layer 2, negative poisson's ratio steel sheet tensile layer 1.
Referring to fig. 1 to 8, polyurea 8 is firstly sprayed on a horizontal steel plate 7 with the thickness of 5mm, the initial thickness of the spraying is 5mm, polyurea slopes with the spraying angle of 5 degrees to the horizontal plane are sprayed, the specific spraying position is shown in fig. 2, and the spraying size is determined according to a negative poisson ratio cell element. And forming a polyurea deflection layer 2 after the polyurea is condensed and hardened, and then processing a 5mm thick steel plate through a bending machine, wherein a unit with the horizontal side length of 100mm and the other two units with the side length of 50mm and the horizontal included angle of 60 degrees is adopted in the embodiment, and the processed unit is shown in figure 3. The two processed steel plates are adhered into a whole by an epoxy resin series cementing agent to form a row of negative poisson ratio cellular structure, namely a negative poisson ratio steel plate tensile layer 1. Then, the foam concrete deflection layer 4 is formed by filling the foam concrete in the negative poisson's ratio cells 9 containing no polyurea. Finally, self-compacting concrete (UHPC) with the strength grade of about 150MPa is filled in the polyurea-containing negative Poisson ratio cell element 10 to form a self-compacting concrete compression-resistant layer 3; the self-compacting concrete is prepared from short steel fibers, fine-grain-size coarse aggregate, quartz sand, P.O.52.5 cement, silica fume, a high-efficiency water reducing agent and the like, and the maintenance is completed for 3-5 days. The upper end and the lower end of the integral structure are respectively adhered with a steel plate with the thickness of 10mm by using epoxy resin series adhesive to form a steel plate buckle cover 5. The positioning base 6 is connected with a steel plate below the structure by bolts.
The foam concrete deflection layer 4 guides the ballistic trajectory of the armor-piercing projectile to deflect, and prevents the projectile head which has the deflection tendency from being corrected again to form straight penetration.
The steel plate buckle cover 5 can increase the contact area of the armor-piercing bullet and the polyurea layer when the armor-piercing bullet impacts the polyurea layer next by blocking the armor-piercing bullet carrying impact kinetic energy; the steel plate buckle cover 5 can effectively reduce the energy carried by the armor-piercing projectile; the whole negative Poisson ratio structure can be tightly covered and fastened, and the integrity of the structure is enhanced.
The polyurea deflection layers 2 positioned on the upper wall and the lower wall of the negative Poisson ratio structure have certain inclination, when the armor-piercing projectile is attacked from the upper part of the plate, the polyurea layer on one side of the cell element of the negative Poisson ratio structure is thicker, and the homogeneous concrete layer is thinner, so that the deflection of the armor-piercing projectile in the ballistic trajectory inside the structure can be guided, and the purpose of reducing the energy of the armor-piercing projectile is achieved
Example 2
The utility model provides a novel combined type concrete protective structure, includes location base 6, steel sheet buckle closure 5, foam concrete deflection layer 4, self-compaction concrete compressive layer 3, polyurea deflection layer 2, negative poisson's ratio steel sheet tensile layer 1.
Referring to fig. 1 to 8, polyurea is firstly sprayed on a horizontal steel plate with the thickness of 2.5mm, the spraying initial thickness is 2.5mm, polyurea slopes with the spraying angles of 5 degrees to the horizontal plane are formed at intervals, the specific spraying positions are shown in fig. 2, and the spraying size is determined according to a negative poisson ratio cell element. After polyurea is condensed and hardened, a steel plate with the thickness of 5mm is processed through a bending machine, a unit with the horizontal side length of 100mm and the other two units with the side length of 50mm and the horizontal included angle of 60 degrees is adopted in the embodiment, and the processed unit is shown in figure 3. And adhering the two processed steel plates into a whole by using an epoxy resin cementing agent to form a row of negative Poisson ratio cell structures. Then, the foam concrete is filled in the negative poisson's ratio cell element without polyurea. And finally, filling self-compacting concrete (UHPC) with the strength grade of about 150MPa in the negative Poisson ratio cell element containing polyurea, wherein the self-compacting concrete is prepared by adopting short steel fibers, fine-grained coarse aggregate, quartz sand, P.O.52.5 cement, silica fume, a high-efficiency water reducing agent and the like, and finishing the maintenance for 3-5 days. The upper end and the lower end of the whole structure are respectively adhered with a 5mm thick steel plate by using epoxy resin series adhesive. Bolts are used to connect the base to the steel plate below the structure.
Example 3
The utility model provides a novel combined type concrete protective structure, includes location base 6, steel sheet buckle closure 5, foam concrete deflection layer 4, self-compaction concrete compressive layer 3, polyurea deflection layer 2, negative poisson's ratio steel sheet tensile layer 1.
Referring to fig. 1 to 8, polyurea is firstly sprayed on a horizontal steel plate with the thickness of 5mm, the initial thickness of the sprayed polyurea is 5mm, polyurea slopes with the spraying angles of 10 degrees to the horizontal plane are formed at intervals, the specific spraying positions are shown in fig. 2, and the spraying size is determined according to a negative poisson ratio cell element. After polyurea is condensed and hardened, a steel plate with the thickness of 5mm is processed through a bending machine, the embodiment adopts a unit with the horizontal side length of 100mm, the other two units with the side length of 50mm and the included angle of 45 degrees with the horizontal, and the processed units are similar to the graph in fig. 3. And adhering the two processed steel plates into a whole by using an epoxy resin cementing agent to form a row of negative Poisson ratio cell structures. Then, the foam concrete is filled in the negative poisson's ratio cell element without polyurea. And finally, filling self-compacting concrete (UHPC) with the strength grade of about 150MPa in the negative Poisson ratio cell element containing polyurea, wherein the self-compacting concrete is prepared by adopting short steel fibers, fine-grained coarse aggregate, quartz sand, P.O.52.5 cement, silica fume, a high-efficiency water reducing agent and the like, and finishing the maintenance for 3-5 days. The upper end and the lower end of the integral structure are respectively adhered with a steel plate with the thickness of 10mm by using epoxy resin series adhesive. Bolts are used to connect the base to the steel plate below the structure.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A composite protective structure resistant to penetration and having ballistic deflection is characterized by comprising a negative Poisson ratio cell structure; a part of cavities of the negative Poisson ratio cell structure are filled with a first filling body with the function of changing penetration direction dispersion impact performance, and the rest cavities are filled with a second filling body; the first filling body consists of a polyurea layer and self-compacting concrete; the polyurea layer is arranged along the inner wall of the cavity and has an inclination relative to the inner wall, and the self-compacting concrete is filled in the cavity provided with the polyurea layer; the second filling body is homogeneous foam concrete.
2. The composite protective structure that is resistant to penetration and has ballistic deflection of claim 1, wherein the negative poisson's ratio cell structure is a concave hexagonal structure.
3. The composite protective structure of claim 1 or 2, wherein the negative poisson's ratio cell structure is made of steel plate.
4. The composite protective structure resistant to penetration and having ballistic deflection of claim 2 wherein the polyurea layers on the upper and lower walls of the cavity are tapered and the polyurea layers on the remaining side walls are disposed along the side walls.
5. The composite protective structure resistant to penetration and having ballistic deflection of claim 4 wherein said slope is from 5 ° to 15 ° from horizontal.
6. A composite protective structure against penetration and having ballistic deflection according to claim 5, wherein the cavity filled with the second filling body is located above the cavity filled with the first filling body.
7. The composite protective structure that is resistant to penetration and has ballistic deflection of claim 1, wherein the upper and lower surfaces of the negative poisson's ratio cell structure are provided with steel plate covers.
8. The composite protective structure resisting penetration and having ballistic deflection as claimed in claim 7, wherein the bottom of the steel plate cover on the lower surface of the negative poisson's ratio cell structure is provided with a positioning base.
9. A method of making a composite protective structure resistant to penetration and having ballistic deflection as defined in claim 1, comprising the steps of:
1) continuously bending the steel plate by a certain angle through steel plate processing equipment;
2) spraying a polyurea layer on the processed steel plate;
3) overlapping the two processed steel plates by using glue to form a negative poisson ratio structure;
4) and respectively pouring self-compacting concrete and changing and homogenizing the foam concrete.
10. The method of making a composite protective structure that is resistant to penetration and exhibits ballistic deflection as claimed in claim 9, wherein steel sheet closures are affixed to the lower two sides of the structure after step 4) to form an integral structure; the protective structure is fixed on the base by bolts.
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CN112227187A (en) * 2020-09-30 2021-01-15 北京工业大学 Pier buffer stop is filled to negative poisson's ratio honeycomb of layering gradient
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