CN113829676B - Modular folding sandwich structure unit for dynamic load protection and sandwich structure - Google Patents
Modular folding sandwich structure unit for dynamic load protection and sandwich structure Download PDFInfo
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- CN113829676B CN113829676B CN202111274405.0A CN202111274405A CN113829676B CN 113829676 B CN113829676 B CN 113829676B CN 202111274405 A CN202111274405 A CN 202111274405A CN 113829676 B CN113829676 B CN 113829676B
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- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 238000010521 absorption reaction Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000002360 explosive Substances 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000006262 metallic foam Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by 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 shape; Layered products comprising a layer 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
- 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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- Vibration Dampers (AREA)
Abstract
The invention provides a modularized folding sandwich structure unit for dynamic load protection and a sandwich structure, and the modularized folding sandwich structure unit comprises a structure unit body, wherein the structure unit body comprises four side plates and eight triangular connecting folded plates, the tops of the four side plates are enclosed to form an open top surface, the side edges of the top surface are respectively connected with one side plate, the side plates and the top surface are obliquely arranged, the included angle between each side plate and the top surface is an obtuse angle, two triangular connecting folded plates which are spliced together are respectively arranged between two adjacent side plates, the two triangular connecting folded plates are folded towards the center of the top surface along the splicing line, and the other side edge of each triangular connecting folded plate is respectively connected with the adjacent side plate. The folding sandwich structure unit can generate a bending deformation trend in the vertical direction in the out-of-plane crushing process through the four inclined side plates; the triangular connecting folded plate in the vertical state can provide powerful support for the out-of-plane direction in the crushing process, and the crush resistance and the energy absorption property of the structural unit are improved.
Description
Technical Field
The invention relates to the technical field of sandwich structures, in particular to a modularized folding sandwich structure unit for dynamic load protection and a sandwich structure.
Background
A sandwich structure is a panel structure of composite construction, usually consisting of two upper and lower face sheets and a central, lighter and crushable core structure. Dynamic loads are loads in which the speed changes abruptly in a very short time, such as shock loads and explosive loads.
The sandwich structure has been widely used in the design of protective structures for dynamic loads such as explosion and impact due to its characteristics of light weight design, high energy absorption, high specific strength, etc. The sandwich structure generally comprises an upper panel, a lower panel and a plurality of cell interlayers, the topological structure of the sandwich structure unit is various, and the typical structure form is honeycomb, corrugation, foam, lattice, grating, negative poisson ratio and the like. However, these topologies have their own drawbacks and disadvantages, which make them not fully suitable for the protection of structures under dynamic loads. For example, the external crushing initial peak force of the traditional honeycomb sandwich structure is large, and is in positive correlation with the loading rate, so that the traditional honeycomb sandwich structure is not suitable for structural protection under different loading rates; the metal foam sandwich structure has low initial peak force, long stroke in the crushing process and a stable deformation failure mode, but has certain limitation as an ideal energy absorption structure due to lower crushing stress and complex processing technology and higher manufacturing cost; the dot matrix, the grid and the negative Poisson ratio sandwich structure are complex in configuration, and the processing and manufacturing of a plurality of structures still stay in a small-size 3D printing stage, so that the manufacturing cost is high and the structure is not suitable for protecting a large-scale structure in practical application.
The folding sandwich structure widens the selection of the sandwich structure configuration, and can obtain the mechanical property advantages which are lacked by the traditional sandwich structure, but the partial folding sandwich structure still has the defects. For example, the typical three-pump (Miura) folded paper sandwich structure has lower crush resistance, poorer deformation mode and more obvious initial peak force; the cubic band (Cube strip) folding sandwich structure has a greatly improved pressure collapse resistance compared with a three-pump folding sandwich structure, but is not suitable for being manufactured in batches and put into practical engineering structure protection application due to complex processing procedures and processes. In addition, the above structure usually needs to be manufactured after the dimensions and protective performance of the protected structure are determined in advance, and the modular assembly process and the interchange between the structural units of the protective sandwich structure cannot be realized, so that the structural design is lack of flexibility and the cost of production and application is increased.
Disclosure of Invention
The present invention is directed to a modular folding sandwich structure unit and a sandwich structure for dynamic load protection that overcomes the energy absorption characteristics and the manufacturing disadvantages and shortcomings of the prior art sandwich structures.
According to one object of the invention, the invention provides a modular folding sandwich structure unit for dynamic load protection, which comprises a structure unit body, wherein the structure unit body comprises four side plates and eight triangular connecting folded plates, the tops of the four side plates are enclosed to form an open top surface, the side edges of the top surface are respectively connected with one side plate, the side plates and the top surface are obliquely arranged, the included angle between each side plate and the top surface is an obtuse angle, two identical triangular connecting folded plates spliced together are respectively arranged between every two adjacent side plates, the two triangular connecting folded plates are folded in half along the splicing line to the center of the top surface, and the other side edge of each triangular connecting folded plate is respectively connected with the adjacent side plate.
Furthermore, the top surface is a rectangular plane, and the side plates which are oppositely arranged are of the same isosceles trapezoid structure.
Furthermore, the top surface is a square plane, and the four side plates are of the same isosceles trapezoid structure.
Further, the side plates and the triangular connecting folded plates are of an integrally formed structure.
Further, the structural unit body is formed by rigidly folding the side panels and the triangular connection flaps.
Further, the side panels and the triangular connection flaps are formed by rigidly folding thin aluminum sheets.
According to another object of the present invention, there is provided a sandwich structure comprising the above modular folding sandwich structure unit for dynamic load protection, wherein the structure unit bodies are arranged in a matrix form, and an upper panel or a lower panel is adhered to the upper surface or the lower surface of each structure unit body.
Further, the structural unit bodies are arranged transversely or longitudinally.
According to the technical scheme, the folding sandwich structure unit can generate a bending deformation trend in the vertical direction in the out-of-plane crushing process through the four inclined side plates; the triangular connecting folded plate in the vertical state can provide powerful support for the out-of-plane direction in the crushing process, and the crushing resistance and the energy absorption property of the structural unit are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a three-dimensional schematic representation of a folded sandwich structural unit of an embodiment of the present invention;
FIG. 2 is a front view of a folded sandwich structural unit of an embodiment of the present invention;
FIG. 3 is a top view of a folded sandwich structural unit according to an embodiment of the present invention;
FIG. 4 is a schematic view of a two-dimensional plan pattern of a folded sandwich structural element of an embodiment of the present invention when fully folded;
FIG. 5 is a schematic view of a two-dimensional plan pattern of an embodiment of the present invention when the folded sandwich structural unit is fully collapsed after adding a rigid crease marking line;
FIG. 6 is a modular assembly layout of a folding sandwich construction according to an embodiment of the present invention;
FIG. 7 is a schematic view of a sandwich structure of the present invention protecting the structure under explosive loading;
fig. 8 is a crushing stress strain diagram of a folded sandwich structure unit test piece with a relative density of 2.3% and a rectangular parallelepiped foamed aluminum test piece with a relative density of 4.2% under quasi-static crushing action according to an embodiment of the invention.
Description of reference numerals:
in the figure: 1-structural unit body, 2-top surface, 3-side plate, 4-triangular connecting folded plate, 5-upper panel, 6-lower panel, 7-explosive load, 8-original panel, 9-crease marking line, 10-protected structure and 11-square small screw.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "coupled" are to be construed broadly and may include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1-3:
the utility model provides a folding sandwich structure unit of modularization for dynamic load protection, includes the constitutional unit body 1, and the constitutional unit body 1 includes four curb plates 3 and eight triangle-shaped connection folded plates 4, and constitutional unit body 1 is formed by curb plate 3 and triangle-shaped connection folded plate 4 rigid folding.
The configuration of the structural unit body 1 after the folding is as follows: the top of four curb plates encloses synthetic top surface 2 that is the opening form, and the side of top surface 2 is connected with a curb plate 3 respectively, and the slope sets up and the contained angle between curb plate 3 and the top surface 2 is the obtuse angle between curb plate 3 and the top surface 2, is equipped with two the same triangle-shaped connection folded plates 4 of concatenation together between two adjacent curb plates 3 respectively, and two triangle-shaped connection folded plates 4 are along the central department fifty percent discount of concatenation line top surface, and another side of two triangle-shaped connection folded plates 4 is connected with adjacent curb plate 3 respectively.
The top surface 2 that is the shape of opening that the top of four curb plates encloses synthetically in this embodiment can be the rectangle plane, and when being the shape of opening top surface 2 was the rectangle plane, the curb plate 3 that is located the rectangle plane opposite side was the same isosceles trapezoid structure.
It should be understood that the top surface 2 mentioned in the present embodiment is actually a shape enclosed by four side plates 3, is not a structural surface formally existing, but is an imaginary plane, and the top surface 2 itself is not a specific component of the structural unit body 1 of the present invention, but is merely an imaginary plane for convenience of description of the present invention.
Example 2
The structure of this embodiment is substantially the same as that of embodiment 1, except that the top surface 2 of the opening shape formed by the top peripheries of the four side plates in this embodiment is a square plane, and when the top surface 2 of the opening shape is a square plane, the four side plates 3 connected to the sides of the square plane are in the same isosceles trapezoid structure.
As shown in fig. 4 and 5, the folding sandwich structure unit in this embodiment is a three-dimensional structure formed by rigid folding for a specifically designed two-dimensional plane pattern, and the folding sandwich structure unit is formed by combining four identical isosceles trapezoidal surfaces and four identical triangular connecting folded plates. The four inclined side plates of the sandwich structure unit are folded to generate a bending deformation trend in the vertical direction in the out-of-plane crushing process; and the four vertical triangular connecting folding plates can provide powerful support for the out-of-plane direction in the crushing process, and the crushing resistance and the energy absorption property of the structural unit are improved. The side plate inclination angle and the size of the triangular connection folding plate can also adjust the size of each part of the two-dimensional plane pattern according to actual performance requirements, so that the folding sandwich structure unit with different mechanical characteristics is obtained.
As shown in fig. 1-3, the three-dimensional structure of the folded sandwich structural unit of the present invention is shaped like a truncated regular quadrangular frustum structure, and two connected triangular faces are folded inwards at the four edges of the regular quadrangular frustum.
As shown in fig. 4, the two-dimensional plane pattern of the folded sandwich structure unit, which is completely folded flat, is a specific dodecagon pattern, a square having a side length of a is cut out from the center of the complete plane, and simultaneously, a raw panel 8 made of thin aluminum sheets, whose outer side sizes are b and y, respectively, are cut out, and combined in a regular order.
As shown in fig. 5, the original panel 8, after having added the outward and inward rigid fold marking lines 9 by laser cutting, can be represented by a pattern formed by a combination of an open square top surface, four identical isosceles trapezoids and eight identical triangular connecting flaps; wherein the dotted line and the dotted line segment represent outward and inward rigid folding creases, respectively, and in the rigid folding process, the planes adjacent to the line segment are rigidly folded outward and inward, respectively, to form a folded sandwich structure unit.
The two-dimensional plane pattern can be also regarded as: the side length of the square is a, and the size of the square is consistent with and superposed with the upper bottoms of the four isosceles trapezoids; the bottom edge of the isosceles trapezoid is b, and the bottom angle is g; the distance between two parallel edges of the isosceles trapezoid is c; the length of the waist of the isosceles trapezoid is l, and the isosceles trapezoid is the longest side of the triangular connecting folded plate; every two triangular connecting folding plates share one short side x to form a pair, and the pair and two adjacent isosceles trapezoids share four points of a square respectively. H is the cell height. The geometrical relationship of the two-dimensional plane pattern is determined by three basic quantities a, b and H; the rest physical quantities can be derived from rigid folding characteristics and paper folding basic principles, and the following relations exist:
y＝x 2 +l 2 -2xl·cosα
the folding sandwich structure unit can well exert the energy absorption characteristic under the action of dynamic load, protect important structural members of the structure and play a role in protection; and can modularly adapt to the requirements of actual engineering structures and assemble sandwich structures with different sizes.
Example 3
As shown in fig. 6, a sandwich structure comprises modular folding sandwich structure units for dynamic load protection, wherein the structure unit bodies 1 are arranged in a matrix form, and an upper panel 5 or a lower panel 6 is respectively adhered to the upper surface or the lower surface of each structure unit body 1.
In order to limit the bottom edge of the side plate 3 of the structural unit body 1 from stretching and sliding in the deformation process, one square small screw 11 is arranged on the lower panel 6 and used as a boundary for limiting the bottom edge of the side plate 3 of the structural unit body 1 from stretching and sliding in the deformation process.
The structural unit bodies 1 are arranged transversely or longitudinally, the folding sandwich structure units can be arranged and combined longitudinally and transversely, and the modularized folding sandwich structure units with specific quantity, number of layers and specific mechanical property are assembled to obtain the sandwich structure meeting the application requirements of actual engineering.
As shown in fig. 7, the folded sandwich structure shields the shielded structure 10 under the blast load 7.
As shown in fig. 8, the collapse stress strain diagram of the folded sandwich structure thin aluminum plate unit test piece with a relative density of 2.3% and the rectangular foamed aluminum test piece with a relative density of 4.2% under the quasi-static collapse action, due to the limitation of the current processing and production technology, the obtained foamed aluminum has a relative density of 4.2% which is about 2 times of that of the novel modular folded sandwich structure unit test piece adopted in the drawing, but the average collapse stresses of the two are basically equal.
The invention relates to a modularized folding sandwich structure unit for dynamic load protection and a sandwich structure thereof, aiming at overcoming the energy absorption characteristic of the existing sandwich structure and the defects and shortcomings of processing and manufacturing, and keeping the lightweight structure design, the crush resistance and the energy absorption capacity of the structure unit can exceed the existing structure with the same relative density; in addition, the mechanical property of the structural unit is less influenced by the loading rate, and the structural unit is suitable for structural protection under the action of loads such as collision, impact and the like at different rates. The protective interlayer structure has the advantages of modular design, the size of the independently controllable structural unit can be manufactured in large batch by a discontinuous processing method, modular assembly is carried out according to the application requirements of actual engineering, the cell element combination is similar to a tiled tile, and protective interlayer structures with different sizes, shapes and mechanical property requirements can be assembled according to the protection requirements of different loads and the size and the shape of the protected structure (such as structures of key beams, columns, wall surfaces and the like).
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A modularized folding sandwich structure unit for dynamic load protection is characterized by comprising a structure unit body, wherein the structure unit body comprises four side plates and eight triangular connecting folded plates, the tops of the four side plates form an open top surface in an enclosing mode, the side edges of the top surface are connected with the side plates respectively, the side plates and the top surface are arranged in an inclined mode, the included angle between each side plate and the top surface is an obtuse angle, two identical triangular connecting folded plates which are spliced together are arranged between every two adjacent side plates respectively, the two triangular connecting folded plates are folded along the splicing line to the center of the top surface, and the other side edges of the triangular connecting folded plates are connected with the adjacent side plates respectively; the top surface is a square plane, and the four side plates are of the same isosceles trapezoid structure; the side plates and the triangular connecting folded plates are of an integrally formed structure; the structural unit body is formed by rigidly folding the side panels and the triangular connection flaps.
2. The modular folding sandwich construction unit for dynamic load protection according to claim 1, characterised in that the side panels and the triangular connection flaps are formed by rigid folding of thin aluminium sheets.
3. A sandwich structure, comprising the modular folding sandwich structure unit for dynamic load protection according to any one of claims 1-2, wherein the structure unit bodies are arranged in a matrix form, and an upper panel or a lower panel is adhered to the upper surface or the lower surface of each structure unit body.
4. Sandwich structure according to claim 3, characterised in that the building block bodies are arranged in transverse or longitudinal direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111274405.0A CN113829676B (en) | 2021-10-29 | 2021-10-29 | Modular folding sandwich structure unit for dynamic load protection and sandwich structure |
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| CN202111274405.0A CN113829676B (en) | 2021-10-29 | 2021-10-29 | Modular folding sandwich structure unit for dynamic load protection and sandwich structure |
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| CN113829676A CN113829676A (en) | 2021-12-24 |
| CN113829676B true CN113829676B (en) | 2023-03-21 |
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| CN111391428A (en) * | 2020-03-13 | 2020-07-10 | 广州大学 | Energy-absorbing core layer, sandwich structure and preparation method |
| CN113236705B (en) * | 2021-04-06 | 2022-12-20 | 广州大学 | Adjustable energy absorbing device based on paper folding structure |
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