CN113773027A - Metamaterial concrete explosion-proof structure based on local resonance - Google Patents
Metamaterial concrete explosion-proof structure based on local resonance Download PDFInfo
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- CN113773027A CN113773027A CN202111330976.1A CN202111330976A CN113773027A CN 113773027 A CN113773027 A CN 113773027A CN 202111330976 A CN202111330976 A CN 202111330976A CN 113773027 A CN113773027 A CN 113773027A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0008—Materials specified by a shape not covered by C04B20/0016 - C04B20/0056, e.g. nanotubes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
- E04C5/073—Discrete reinforcing elements, e.g. fibres
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2046—Shock-absorbing materials
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- 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
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Abstract
The invention belongs to the technical field of protective materials, and relates to a metamaterial concrete explosion-proof structure based on local resonance; the material comprises a gelled matrix and a multi-stage local resonance scattering material randomly distributed in the gelled matrix; the multistage local resonance scattering material is a plurality of microstructures with negative dynamic mass and different sizes, and the microstructures generate an anti-phase effect and negative effective mass density behavior to attenuate shock waves when receiving the explosion shock waves, so that the explosion-proof structure is prevented from generating multiple-time laminated fracture damage; the multistage local resonance scattering material is composed of an internal core body and a flexible layer coating the outside of the core body; the invention solves the problem that the inner side surface of the protective material is reflected to form tensile wave and cause multiple times of spalling under the repeated striking of local multi-bullet.
Description
Technical Field
The invention belongs to the technical field of protective materials, and relates to a metamaterial concrete explosion-proof structure based on local resonance.
Background
The explosion shock wave is an instant strong compression wave, can cause serious injury to structures and personnel, and the purpose of the protective structure is to reduce the peak overpressure of the shock wave and effectively protect the safety of buildings and personnel. At present, the protective structure of civil engineering such as national defense engineering, nuclear power station and the like is most widely used and is of a reinforced concrete structure. When the explosive compression wave with a higher peak value and a shorter duration is reflected on the free surface at the inner side of the concrete protection structure to form a tensile wave and forms a higher tensile stress at a position close to the free surface, the concrete material with a lower dynamic tensile strength is easy to form spalling or collapse, and serious threats are formed to personnel and equipment in the engineering. At the same time, a new free surface is formed at the internal fracture surface, which has the same boundary conditions as the original free surface, and the high-intensity initial wave can cause multiple delaminations of the structure.
Along with the continuous improvement of the hit precision of the accurate guided weapon, the local multi-bullet repeated striking is implemented to the protection engineering structure, so the spalling damage prevention capability of the inner side of the concrete protection structure is in urgent need of improvement.
Many new material systems are currently used for protection against blast impacts, but most protective structures use deformation of the material to absorb energy, resulting in significant material damage. It has been found that any one blast pulse wave can be differentiated into a superposition of sine waves. Meanwhile, the higher the amplitude of the energy spectrum of the explosion wave in a certain frequency range is, the greater the destructive effect on the target with the natural vibration frequency in the frequency range is. And the metamaterial is an emerging field in material engineering due to the unconventional metamaterial property of the metamaterial. The metamaterial can construct a negative dynamic mass system by finely designing an internal microstructure, and can generate an anti-phase effect based on a resonance principle, so that negative effective mass density behaviors are caused to attenuate shock waves. However, under the repeated hitting of local multi-bullet, even if the thickness of the explosion-proof structure of the existing material is large, the material still has multiple times of delamination caused by tensile waves formed by the reflection of the inner side surface.
Disclosure of Invention
The invention overcomes the defects of the prior art, provides a metamaterial concrete explosion-proof structure based on local resonance, and solves the problem that the inner side surface of a protective material is reflected to form tensile waves and cause multiple times of spalling under the repeated impact of local multiple bullets.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the metamaterial concrete explosion-proof structure based on the local resonance comprises a gelled matrix and multistage local resonance scattering materials randomly distributed in the gelled matrix; the multistage local resonance scattering material is a plurality of microstructures with negative dynamic mass and different sizes, and the microstructures generate an anti-phase effect and a negative effective mass density behavior when receiving an explosion shock wave to attenuate the shock wave, so that the explosion-proof structure is prevented from generating multiple-time laminated fracture damage; the multistage local resonance scattering material is composed of an inner core body and a flexible layer wrapping the outer portion of the core body.
Preferably, the multistage localized resonance scattering material is randomly distributed in the gel matrix through equal-density pouring.
Preferably, the equal-density pouring is to adjust the volume ratio of the core body to the flexible layer to enable the density of the multilevel local resonance scattering material to be approximately equal to that of the gelled matrix, and the multilevel local resonance scattering material is placed into the gelled matrix and stirred to enable the multilevel local resonance scattering material to be uniformly suspended in the gelled matrix.
More preferably, the microstructures comprise spheroids of the same density and different sizes having a diameter of 0.5-24 cm.
The core body is a spheroid, and the density of the core body is
Volume is
Radius of sphere is
(ii) a The flexible layer is a hollow sphere with the density of
Volume is
The inner diameter of the hollow sphere is
The external diameter of the hollow sphere is
(ii) a By controlling the average density of the multi-stage localized resonance scattering material
Density with gelled matrix
Keeping the two values approximately equal:
the approximate relationship of the radius ratio of the core body to the flexible layer is as follows:
。
preferably, the core body is metal or non-goldOf metal or polymer material, the core material having a Young's modulus of 3X 108-1×1012Pa, density of 5000-3。
Preferably, the flexible layer is made of silicone material or rubber or resin material, and the Young's modulus of the flexible layer material is 8 × 103-2×106Pa, density of 800-1800kg/m3。
Preferably, the gelled matrix is a gelled body formed by mixing and stirring PO42.5 portland cement, fine aggregate and water.
Preferably, the core body is formed by machining or die forming, and the flexible layer is formed by a special die through a high-temperature hot pressing process.
Compared with the prior art, the invention has the following beneficial effects:
the invention combines the natural vibration frequency of various concrete protection structure components, and purposefully invents an elastic wave metamaterial derived by combining a local resonance type metamaterial and a cementing material by analyzing the energy spectrum of various explosion shock wave actions, wherein the metamaterial modifies the dynamic response frequency spectrum of an explosion-proof structure under the excitation of explosion shock waves based on local resonance physics, thereby avoiding multiple-time laminar fracture damage caused by the explosion shock waves to the inner side of the explosion-proof structure.
The metamaterial property of the multistage local resonance scattering unit forming the explosion-proof structure is not caused by the chemical composition of materials, but by the finely designed microstructure of the material. By finely designing the metamaterial with the internal microstructure of the material, a negative dynamic mass system can be constructed, and an anti-phase effect can be generated based on the local resonance principle, so that the negative effective mass density acts to attenuate shock waves. Meanwhile, the energy spectrums of various shock wave actions can be analyzed, microstructures with different specifications are adopted for the explosion-proof structure, and the shielded explosion wave peak frequency section is widened to the maximum extent, so that multiple-time laminar fracture damage to the inner side of the explosion-proof structure caused by explosion shock waves is avoided.
Drawings
Fig. 1 is a structural schematic diagram of a metamaterial concrete explosion-proof structure.
Fig. 2 is a partial perspective view at Ӏ in fig. 1, with two gauges of multi-stage localized resonance scattering material.
Fig. 3 is an internal configuration diagram of a multi-stage localized resonance scattering material.
In the figure, 1 is a multistage local resonance scattering material, 2 is a gelled matrix, 101 is a heavy core, 102 is a flexible coating layer, and 3 is a concrete explosion-proof structure.
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.
As shown in fig. 1-2, the metamaterial concrete explosion-proof structure based on the local resonance principle comprises a gel matrix 2 and a plurality of stages of local resonance scattering materials 1 randomly distributed in the gel matrix 2. The multi-stage localized resonance scattering material 1 is a microstructure of two specifications with negative dynamic mass. The microstructures of both specifications were spheroids of the same density with diameters of 5cm and 10 cm. The microstructure comprises a heavy core 101 and a flexible cladding 102, see fig. 3; heavy core 101 acts as a spherical mass for the local resonance scattering unit; the flexible cover 102 provides a certain stiffness. The heavy core 101 is made of a lead material formed by machining. The flexible coating 102 is an artificial resin material formed by a high-temperature hot-pressing process using a special mold. The gelled matrix 2 is a gelled body formed by mixing and stirring PO42.5 ordinary portland cement, fine aggregate and water, wherein the fine aggregate comprises river sand materials.
The multistage local resonance scattering materials 1 are randomly distributed in the gelled matrix 2 through an equal-density pouring process. The equal-density pouring process is to adjust the volume ratio (radius ratio) of the heavy core 101 to the flexible coating layer 102 to realize the non-difference between the density of the multistage local resonance scattering material 1 of the two specifications and the density of the gel matrix 2. Wherein, the heavy core of the multilevel local resonance scattering material 1 is a sphere with the density of
Volume is
Radius of sphere is
(ii) a The flexible coating 102 is a hollow sphere having a density of
Volume is
The inner diameter of the hollow sphere is
The external diameter of the hollow sphere is
. By controlling the average density of the multi-stage localized resonance scattering material 1
Density with the gelled matrix 2
So that the values remain approximately equal.
The specific derivation is as follows:
the approximate relationship of the ratio of the radii of the heavy core 101 and the flexible coating 102 is:
。
therefore, the ratio of the radii of the heavy core 101 and the flexible coating layer 102 is controlled to meet the approximate relationship as much as possible in the equal-density pouring process, so that the multistage local resonance scattering material 1 can be uniformly suspended in the cement mortar cementing material in the stirring process, and the uniform random distribution of the multistage local resonance scattering material 1 in the cementing matrix 2 is maximally improved.
The working process is as follows:
by analyzing the energy spectrum of the shock wave action and adopting the local resonance scattering units with two specifications for the explosion-proof structure, a negative dynamic quality system is constructed, and the shielded peak frequency section of the shock wave is widened to the maximum extent. Under the action of the explosion shock wave, the two-stage local resonance scattering material can generate an anti-phase effect based on a resonance principle, so that negative effective mass density behavior is caused to attenuate the shock wave, and multiple-time spalling damage caused by the explosion shock wave to the inner side of the explosion-proof structure is avoided.
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 (9)
1. The metamaterial concrete explosion-proof structure based on local resonance is characterized by comprising a gelled matrix (2) and multistage local resonance scattering materials (1) which are randomly distributed in the gelled matrix (2); the multi-stage local resonance scattering material (1) is a plurality of microstructures with negative dynamic mass and different sizes, and the microstructures generate an anti-phase effect and a negative effective mass density behavior when receiving an explosion shock wave to attenuate the shock wave and prevent the explosion-proof structure from generating multiple-time spalling damage; the multistage local resonance scattering material (1) is composed of an inner core body and a flexible layer wrapping the outer portion of the core body.
2. The metamaterial concrete blast resistant structure based on local resonance as claimed in claim 1, wherein the multi-level local resonance scattering materials (1) are randomly distributed in the cementitious matrix (2) by isopycnic casting.
3. The metamaterial concrete blast-proof structure based on local resonance as claimed in claim 2, wherein the equal density casting is to adjust the volume ratio of the core body and the flexible layer to make the density of the multi-stage local resonance scattering material (1) approximately equal to that of the gel matrix (2), and the multi-stage local resonance scattering material (1) is put into the gel matrix (2) to be stirred to make the multi-stage local resonance scattering material (1) uniformly suspended in the gel matrix (2).
4. The metamaterial concrete blast resistant structure based on local resonance as claimed in claim 3, wherein the microstructures comprise spheroids of the same density and different sizes with a diameter of 0.5-24 cm.
5. The metamaterial concrete blast resistant structure based on local resonance as claimed in claim 4, wherein the core body has a density of
Volume is
Radius of sphere is
(ii) a The flexible layer is a hollow sphere with the density of
Volume is
The inner diameter of the hollow sphere is
Outside of hollow sphere bodyHas a diameter of
(ii) a By controlling the average density of the multi-stage localized resonance scattering material (1)
Density of the gelled matrix (2)
Keeping the two values approximately equal:
the approximate relationship of the radius ratio of the core body to the flexible layer is as follows:
。
6. the metamaterial concrete blast resistant structure based on local resonance as claimed in claim 4 or 5, wherein the core body is a metal or nonmetal or polymer material, and the Young's modulus of the core body material is 3 x 108-1×1012Pa, density of 5000-3。
7. The metamaterial concrete explosion-proof structure based on local resonance as claimed in claim 6, wherein the flexible layer is made of silicone material or rubber or resin material, and the Young's modulus of the flexible layer material is 8 x 103-2×106Pa, density of 800-1800kg/m3。
8. The metamaterial concrete blast resistant structure based on local resonance as claimed in claim 1, wherein the cementitious matrix (2) is a cementitious body formed by mixing and stirring PO42.5 portland cement, fine aggregate and water.
9. The metamaterial concrete explosion-proof structure based on local resonance as claimed in claim 1, wherein the core body is formed by machining or die forming, and the flexible layer is formed by a high-temperature hot-pressing process by using a special die.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115432974A (en) * | 2022-10-17 | 2022-12-06 | 西南科技大学 | Multi-band-gap combined and controlled concrete metamaterial structure and preparation method thereof |
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