CN111204103A - Wave-shaped lattice web reinforced composite material sandwich structure and preparation method thereof - Google Patents
Wave-shaped lattice web reinforced composite material sandwich structure and preparation method thereof Download PDFInfo
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- CN111204103A CN111204103A CN202010161728.8A CN202010161728A CN111204103A CN 111204103 A CN111204103 A CN 111204103A CN 202010161728 A CN202010161728 A CN 202010161728A CN 111204103 A CN111204103 A CN 111204103A
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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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed 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
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/10—Next to a fibrous or filamentary layer
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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
- B32B3/26—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
- B32B3/263—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 having non-uniform thickness
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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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary 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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
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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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
- B32B2260/023—Two or more layers
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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
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/101—Glass fibres
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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
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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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
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
- B32B2266/0278—Polyurethane
-
- 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
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Abstract
The invention discloses a sandwich structure of a wave-shaped lattice web reinforced composite material and a preparation method thereof, wherein the structure is vertically cut along the thickness direction of a core material according to a wave shape, the cut core material is wrapped by fiber cloth, and the fiber cloth and resin are cured to form a wave-shaped lattice web; and laying fiber cloth on the core material up and down, and curing the fiber cloth and resin to form the fiber panel. The invention is generally applied to structural members with larger bearing capacity, such as: bridge panels, building panels, road panels, impact panels, and the like. Compared with other products, the wave-shaped lattice web reinforced composite sandwich structure has the greatest characteristic that the wave-shaped lattice web can obviously reduce the elastic sudden change of the bearing capacity of the sandwich structure, so that the integral stress performance of the composite sandwich structure is obviously improved.
Description
Technical Field
The invention relates to a wave-shaped lattice web reinforced composite material sandwich structural beam, plate and shell structural member which is generally applied to structural members with larger load in the fields of buildings, bridges, collision avoidance and the like, and comprises the following components: bridge deck, road deck, wall deck, floor deck, impact panel, and the like.
Background
The composite sandwich structure consists of three parts including outermost panel, middle core and lattice web connecting the core and the panel. The outermost panel mainly bears the positive stress caused by bending deformation and is made of high-strength and high-modulus materials such as laminated carbon fiber or glass fiber cloth; the core material of the middle layer provides enough section inertia moment for the sandwich structure, mainly bears shear stress, and is made of materials such as honeycomb, foam, balsa wood and the like. Between the face sheet and the core material is a lattice web, and the two are bonded together by a resin, and an unsaturated polyester, a vinyl resin, an epoxy resin, a phenol resin, or the like is generally used.
The composite material sandwich structure not only fully utilizes the advantages of high strength and light weight of fiber materials, but also skillfully utilizes the section inertia moment obtained by the light core material to achieve ideal structural performance (such as strength, rigidity, energy absorption performance and the like), and has the incomparable characteristics of other materials such as high specific strength, high specific rigidity, strong designability and the like and the development trend of being suitable for the characteristics of light weight, high speed, safety, fatigue resistance, corrosion resistance, invisibility and the like, the application field of the composite material sandwich structure is more and more extensive, and the composite material sandwich structure can relate to the fields of military facilities, national defense engineering, vehicles, ships, buildings, bridges and the like; for example, composite sandwich structures are adopted in developed countries to manufacture ship components, carriages, containers, material-carrying tank cars, chemical storage tanks and the like of trains and large buses, and the composite sandwich structures are even used for lunar landing vehicles of the U.S. space navigation bureau rover; in the field of bridge construction, the composite material can be used for roof boards, building templates, wall partition boards, bridge decks, airport temporary backing boards, portable boat bridges and the like. Therefore, the composite material sandwich structure is a material and a structural form with wide development prospect.
In China, most of composite sandwich structures take honeycombs as core materials, but the contact area between a panel and the core materials of the honeycomb sandwich structures is small, so that the bonding performance of the sandwich structures is relatively weak. In addition, China also has a composite sandwich structure taking polyurethane and other foams as core materials, but because the compression resistance and the shear resistance of the foam are lower, the tensile resistance of the fiber panel cannot be fully utilized, so that the sandwich structure cannot be widely applied.
Disclosure of Invention
The invention aims to provide a novel wave-shaped latticed web reinforced composite material sandwich structure aiming at the defects that the elastic bearing capacity of the conventional latticed web reinforced composite material sandwich component is suddenly reduced and the elastic compression stroke is short, and the novel wave-shaped latticed web reinforced composite material sandwich structure can obviously improve the failure mode of the composite material sandwich structure, reduce the elastic sudden change of the bearing capacity of the sandwich structure, increase the elastic compression stroke and reduce the brittleness of the sandwich structure.
The technical scheme adopted by the invention is as follows: a sandwich structure of a wave-shaped lattice web reinforced composite material comprises a core material, a wave-shaped lattice web and a fiber panel layer;
the sandwich structure is a multilayer structure formed by stacking a plurality of core materials, each core material is subjected to wave-shaped cutting in the thickness direction, fiber cloth is filled in the cutting position, resin is introduced to form a wave-shaped lattice web, the upper surface and the lower surface of each core material are wrapped with the fiber cloth and are cured with the resin to form a fiber panel layer, and the fiber cloth is one or more layers;
and adjacent core materials of the sandwich structure are vertically cut along the chord in the same direction or reversely along the chord, and the formed wave-shaped lattice web plates are arranged in a unidirectional or bidirectional manner in the plane direction of the core materials.
The amplitude, the period and the arrangement mode of the wave-shaped lattice web plate are arbitrary, the thicknesses of the upper surface and the lower surface of the core material of the fiber panel can be consistent or inconsistent, and the laying direction and the number of the layers of the fiber cloth layer can be flexibly adjusted according to requirements.
Preferably, the core material is foam, balsa wood or any other material, and comprises: polyurethane foam, polyvinyl chloride foam, carbon foam, Balsa wood, paulownia wood, fir wood, oak, or plywood.
Preferably, the fiber panel layer is made of fiber material, and comprises: carbon, glass, aramid or hybrid fiber cloth, either monoaxial or biaxial or multiaxial.
Preferably, the resin comprises: unsaturated polyester, vinyl, epoxy or phenolic resins.
The preparation method of the wave-shaped lattice web reinforced composite material sandwich structure comprises the following steps:
a. cutting the core material along the thickness direction of the core material according to a waveform, wherein the cutting positions, the sizes and the number can be arranged according to the stress requirement;
b. the cut core material can be processed into the shapes of beams, plates, shells and the like according to the requirement of a sandwich structure;
c. one or more layers of fiber cloth are filled in the cut positions, and then the one or more layers of fiber cloth are laid on the upper and lower surfaces of the core material.
d. Resin is filled into a vacuum bag or a mould through the processes of a vacuum bag forming process, a vacuum infusion forming process and the like;
e. and after the resin is cured and molded, taking out the fiber cloth, filling the cut positions of the fiber cloth and the resin, curing the fiber cloth and the resin to form the corrugated lattice web, and curing the fiber cloth and the resin to form the fiber panel layer. The sandwich structure of the wave-shaped lattice web reinforced composite material, which has the advantages of obviously improved structural bearing capacity, obviously reduced sudden change of elastic bearing capacity and obviously improved failure mode, can be obtained by the method.
Has the advantages that: compared with other products, the wave-shaped lattice web reinforced composite material sandwich structure has the greatest characteristic that the wave-shaped lattice web along the thickness direction of the core material not only can obviously improve the bearing capacity of the sandwich structure and the anti-stripping capacity of the panel and the core material, but also can effectively reduce the elastic sudden change of the bearing capacity of the sandwich structure, improve the failure mode of the sandwich structure and reduce the brittleness of the sandwich structure.
Drawings
Fig. 1 is a first schematic view of an embodiment 1 of a corrugated lattice web reinforced composite material.
Fig. 2 is a schematic view of a second embodiment 1 of the corrugated lattice web reinforced composite material.
Fig. 3 is a schematic view of an embodiment 2 of a corrugated lattice web reinforced composite material.
In the drawings: 1 is a core material; 2 is a spatial lattice web; 3 is a fiber panel layer, t1Is the thickness of the foam core, t2The thickness of the upper and lower panels.
The wave lattice adopts sine function
l is the length of the wave-shaped lattice, which is composed of n wave-shaped bodies, l ═ nl1，t3Is the thickness of the corrugated lattice.
Detailed Description
The invention will be further described with reference to the accompanying drawings and detailed description:
example 1
As shown in fig. 1 and fig. 2, a sandwich structure of a wave-shaped lattice web reinforced composite material comprises a core material 1, wave-shaped lattice webs 2 and fiber panel layers 3;
the sandwich structure is a double-layer structure formed by overlapping two core materials 1, wherein each core material 1 is subjected to wave-shaped cutting in the thickness direction, the adjacent core materials 1 are vertically cut along the chord in the same direction, fiber cloth is filled in the cut positions, resin is introduced to form a wave-shaped lattice web 2, the upper surface and the lower surface of each core material 1 are wrapped with the fiber cloth and are cured with the resin to form a fiber panel layer 3, and the fiber cloth is a layer.
The core material 1 is polyurethane foam, the fiber panel layer 3 is uniaxial carbon fiber cloth, and the resin is unsaturated polyester.
The preparation method of the wave-shaped lattice web reinforced composite material sandwich structure comprises the following steps:
a. cutting the core material along the thickness direction of the core material according to a waveform, wherein the cutting positions, the sizes and the number can be arranged according to the stress requirement;
b. the cut core material can be processed into the shapes of beams, plates, shells and the like according to the requirement of a sandwich structure;
c. one or more layers of fiber cloth are filled in the cut positions, and then the one or more layers of fiber cloth are laid on the upper and lower surfaces of the core material.
d. Resin is filled into a vacuum bag or a mould through the processes of a vacuum bag forming process, a vacuum infusion forming process and the like;
e. and after the resin is cured and molded, taking out the fiber cloth, filling the cut positions of the fiber cloth and the resin, curing the fiber cloth and the resin to form the corrugated lattice web, and curing the fiber cloth and the resin to form the fiber panel layer. The sandwich structure of the wave-shaped lattice web reinforced composite material, which has the advantages of obviously improved structural bearing capacity, obviously reduced sudden change of elastic bearing capacity and obviously improved failure mode, can be obtained by the method.
Example 2
As shown in fig. 3, a wave-shaped lattice web reinforced composite sandwich structure comprises a core material 1, wave-shaped lattice webs 2 and a fiber panel layer 3;
the sandwich structure is a three-layer structure formed by stacking three core materials 1, wherein each core material 1 is subjected to wave-shaped cutting in the thickness direction, adjacent core materials 1 are vertically cut along the chord direction, fiber cloth is filled in the cut positions and resin is introduced to form a wave-shaped lattice web 2, the upper surface and the lower surface of each core material 1 are wrapped with the fiber cloth and are cured with the resin to form a fiber panel layer 3, and the fiber cloth is multi-layer.
The core material 1 is paulownia wood, the fiber panel layer 3 is glass fiber cloth, and the resin comprises vinyl resin.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (5)
1. A wave mode lattice web reinforcing composite material sandwich structure which characterized in that: comprises a core material, a wave-shaped lattice web and a fiber panel layer;
the sandwich structure is a multilayer structure formed by stacking a plurality of core materials, each core material is subjected to wave-shaped cutting in the thickness direction, fiber cloth is filled in the cutting position, resin is introduced to form a wave-shaped lattice web, the upper surface and the lower surface of each core material are wrapped with the fiber cloth and are cured with the resin to form a fiber panel layer, and the fiber cloth is one or more layers;
and adjacent core materials of the sandwich structure are vertically cut along the chord in the same direction or reversely along the chord, and the formed wave-shaped lattice web plates are arranged in a unidirectional or bidirectional manner in the plane direction of the core materials.
2. The corrugated lattice web reinforced composite sandwich structure of claim 1, wherein: the core material is polyurethane foam, polyvinyl chloride foam, carbon foam, Balsa wood, paulownia wood, fir wood, oak or plywood.
3. The corrugated lattice web reinforced composite sandwich structure of claim 1, wherein: the fiber panel layer is made of carbon fiber, glass fiber, aramid fiber or hybrid fiber cloth in a single axial direction, a double axial direction or a multi-axial direction.
4. The corrugated lattice web reinforced composite sandwich structure of claim 1, wherein: the resin is unsaturated polyester, vinyl resin, epoxy resin or phenolic resin.
5. The method for preparing a sandwich structure of a corrugated lattice web reinforced composite material according to claim 1, 2, 3 or 4, wherein: the method comprises the following steps:
a. cutting the core material along the thickness direction of the core material according to a waveform, wherein the cutting positions, sizes and numbers are arranged according to the stress requirement;
b. the cut core material is processed into the shapes of beams, plates and shells according to the requirement of a sandwich structure;
c. filling one or more layers of fiber cloth at the cut positions, and then paving the one or more layers of fiber cloth on the upper surface and the lower surface of the core material;
d. filling resin into a vacuum bag or a mold through a vacuum bag molding process or a vacuum infusion molding process;
e. and after the resin is cured and molded, taking out the sandwich structure, filling the cut positions filled with the fiber cloth, curing the cut positions and the resin to form the wave-shaped lattice web, and curing the fiber cloth and the resin to form a fiber panel layer to obtain the wave-shaped lattice web reinforced composite material sandwich structure.
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| CN202010161728.8A CN111204103A (en) | 2020-03-10 | 2020-03-10 | Wave-shaped lattice web reinforced composite material sandwich structure and preparation method thereof |
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| CN202010161728.8A CN111204103A (en) | 2020-03-10 | 2020-03-10 | Wave-shaped lattice web reinforced composite material sandwich structure and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113021945A (en) * | 2021-03-11 | 2021-06-25 | 哈尔滨工程大学 | Integrated preparation method of three-dimensional auxetic structure of foam filled composite material |
| CN113148108A (en) * | 2021-06-02 | 2021-07-23 | 中南大学 | Double-layer corrugated sandwich heat-insulation/bearing integrated heat protection structure |
| CN113352645A (en) * | 2021-06-03 | 2021-09-07 | 哈尔滨工程大学 | Integrated preparation method of foam filled composite material hemispherical auxetic structure |
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| CN101314935A (en) * | 2008-07-17 | 2008-12-03 | 南京工业大学 | Composite material bridge deck |
| CN101954761A (en) * | 2010-08-03 | 2011-01-26 | 南京工业大学 | Spatial fiber web-reinforced composite material sandwich structure part |
| CN202401749U (en) * | 2011-12-01 | 2012-08-29 | 成都三士达科技有限公司 | Light-weight and high-strength concrete formwork made of composite materials |
| CN108045010A (en) * | 2017-12-07 | 2018-05-18 | 哈尔滨工程大学 | Multilayer materials foam battenboard and preparation method |
| CN212021913U (en) * | 2020-03-10 | 2020-11-27 | 南京工业大学 | Wave-shaped lattice web reinforced composite material sandwich structure |
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2020
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| CN101067343A (en) * | 2007-04-10 | 2007-11-07 | 南京工业大学 | Grid structural reinforced composite material sandwich structure |
| CN101314935A (en) * | 2008-07-17 | 2008-12-03 | 南京工业大学 | Composite material bridge deck |
| CN101954761A (en) * | 2010-08-03 | 2011-01-26 | 南京工业大学 | Spatial fiber web-reinforced composite material sandwich structure part |
| CN202401749U (en) * | 2011-12-01 | 2012-08-29 | 成都三士达科技有限公司 | Light-weight and high-strength concrete formwork made of composite materials |
| CN108045010A (en) * | 2017-12-07 | 2018-05-18 | 哈尔滨工程大学 | Multilayer materials foam battenboard and preparation method |
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| CN113021945A (en) * | 2021-03-11 | 2021-06-25 | 哈尔滨工程大学 | Integrated preparation method of three-dimensional auxetic structure of foam filled composite material |
| CN113148108A (en) * | 2021-06-02 | 2021-07-23 | 中南大学 | Double-layer corrugated sandwich heat-insulation/bearing integrated heat protection structure |
| CN113352645A (en) * | 2021-06-03 | 2021-09-07 | 哈尔滨工程大学 | Integrated preparation method of foam filled composite material hemispherical auxetic structure |
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