CN111688297A - Corrugated-folded paper multi-level sandwich energy absorption structure and preparation method thereof - Google Patents
Corrugated-folded paper multi-level sandwich energy absorption structure and preparation method thereof Download PDFInfo
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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
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
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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
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/18—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by an internal layer formed of separate pieces of material which are juxtaposed side-by-side
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- 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
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- B33Y10/00—Processes of additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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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
- B32B2571/00—Protective equipment
- B32B2571/02—Protective equipment defensive, e.g. armour plates, anti-ballistic clothing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2605/00—Vehicles
- B32B2605/12—Ships
Abstract
The invention discloses a corrugated-folded paper multi-level sandwich energy absorption structure and a preparation method thereof. The structure is modeled by commercial software, digitally sliced and finally introduced into a 3D printer for integrated forming, and the corrugated-folded paper multi-level sandwich energy absorption structure is obtained. The invention realizes the hybrid composite design and preparation of the corrugated and paper folding structure, and the obtained corrugated-paper folding multilevel sandwich energy absorption structure has the characteristics of high bearing capacity, high buckling resistance and strong energy absorption capacity, and has very good application prospect in the fields of aerospace, transportation, high-end equipment and national defense and military.
Description
Technical Field
The invention belongs to the technical field of light porous energy absorption structures, and particularly relates to a corrugated-folded paper multi-level sandwich energy absorption structure and a preparation method thereof.
Background
In recent years, with the development of industrial equipment, material preparation and machining technologies, a variety of lightweight porous materials have emerged as a new type of multifunctional material, which has the characteristic of structural and functional integration and is easy to realize multifunctional integration. Compared with the traditional material, the light porous material has a changeable microstructure and higher porosity, and can be roughly divided into two categories of disorder and order according to the different degrees of the regularity of the core microstructure: the former includes foamed materials (such as metal foams, ceramic foams, organic foams, and the like) and fiberized materials (such as fiber mats, and the like), and the latter mainly includes two-dimensional lattice structures (such as corrugated plate structures, honeycomb structures, and the like), three-dimensional truss structures (such as pyramid structures, tetrahedral structures, square straight rod structures, and the like), and three-dimensional Ori structures (such as Miura-Ori structures, and the like). The three-dimensional paper folding structure is evolved according to the traditional and old paper folding process in China, has good mechanical properties under various loading working conditions, and also overcomes the problem of water accumulation commonly existing in the traditional honeycomb structure.
The research on the corrugated structure is mature, the structural form is a little single, the structure is easy to be unstable after reaching the bearing limit, and the bearing and energy absorption are limited. And the deformation constraint is increased at the intersection of two adjacent inclined plates in the classic Miura-Ori structure in the paper folding structure due to the existence of the intersection edge, the bearing capacity of the paper folding structure is obviously improved, and the two inclined plates have the defect of insufficient energy absorption capacity in subsequent deformation. The concept of multi-level structure compounding and hybrid design not only can realize the integration of the advantages and properties of two structures or materials, but also can possibly generate new beneficial effects. Through this patent unique design with paper folding structure and corrugated structure mix the complex, can compensate the not enough of current structural mechanics performance to obtain the novel energy-absorbing structure that mechanical properties promoted by a wide margin.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a corrugated-Ori paper multi-level sandwich energy-absorbing structure and a preparation method thereof, aiming at the defects in the prior art, the corrugated structure and the Miura-Ori paper folding structure are compounded together, so that the overall mechanical property of the structure is improved, and the corrugated-Ori paper multi-level sandwich energy-absorbing structure has the characteristics of excellent bearing, buckling resistance and energy absorption.
The invention adopts the following technical scheme:
a ripple-paper folding multilevel sandwich energy absorption structure comprises a ripple-paper folding multilevel structure core body, wherein the ripple-paper folding multilevel structure core body comprises a plurality of ripple-folding multilevel structure unit cells, the ripple-folding multilevel structure unit cells are arranged between an upper panel and a lower panel in a periodic mode, the first-level structure of the ripple-folding multilevel structure unit cells is a paper folding structure, the second-level structure of the ripple-folding multilevel structure unit cells is a ripple structure, and each ripple-folding multilevel structure unit cell comprises four ripple sandwich panels which are obliquely arranged.
Specifically, four edge lines are formed at the joint of the left and right adjacent corrugated sandwich plates in the corrugated-folded multi-stage structural unit cell, two edge lines at the inner side are intersected at the upper panel and the lower panel, and acute angles formed between the four edge lines and the lower panel are the same and are 30-60 degrees.
Furthermore, the corrugated-folded multi-stage structure unit cells are distributed symmetrically about the middle axial plane passing through the four ridges.
Specifically, the top view of the corrugated-folded multi-stage structural unit cell is in a herringbone shape, and the included angle of the herringbone is 60-120 degrees.
Specifically, the corrugated channels in the corrugated sandwich panel are adjustable.
Specifically, the corrugation form inside the corrugated sandwich plate is triangular, trapezoidal, sinusoidal or hat-shaped.
Specifically, the upper panel and the lower panel are both single-layer panels.
According to another technical scheme, the method for preparing the corrugated-folded paper multi-level sandwich energy-absorbing structure comprises the steps of firstly drawing a data model of the corrugated-folded paper multi-level sandwich energy-absorbing structure, then slicing the digital cross section of the data model to obtain slice data, guiding the slice data into a 3D printer, selecting metal powder raw materials according to conditions, and integrally processing and molding through the 3D printer to obtain the corrugated-folded paper multi-level sandwich energy-absorbing structure.
Specifically, the method comprises the following steps:
s1, determining relevant adjustable geometric parameters of the corrugated-folded paper multi-level sandwich energy absorption structure, drawing a three-dimensional data model of the corrugated-folded paper multi-level sandwich energy absorption structure, converting the three-dimensional data model into STL format data and exporting the STL format data, wherein the relevant adjustable geometric parameters comprise two side lengths of an inclined corrugated plate in a first-level folded paper structure, an acute angle formed by the inclined corrugated plate and a horizontal plane, a herringbone included angle, independent geometric parameters of a second-level corrugated structure in a specific corrugated shape, panel thickness and corrugated thickness;
s2, carrying out digital cross section slicing on the data model of the STL format data obtained in the step S1 to obtain slice data of the three-dimensional data model;
s3, determining 3D printing process parameters, selecting metal powder raw materials, and performing 3D layer-by-layer printing according to the slice data of the three-dimensional data model obtained in the step S2 to obtain the corrugated-folded paper multi-level sandwich energy absorption structure.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a novel ripple-paper folding multilevel sandwich energy absorption structure, which comprises a core body consisting of a plurality of ripple-paper folding multilevel structure unit cells which are periodically arranged, wherein the core body is arranged between an upper panel and a lower panel, each ripple-paper folding multilevel structure unit cell comprises four inclined ripple sandwich plates, and when the structure bears an out-of-plane compression load, the boundary constraint of each substructure flat plate in the core body is mutually strengthened due to the introduction of a ripple-folding multilevel structure at the initial stage of the load, so that the buckling resistance of the structure is effectively improved, and the peak stress of the structure is improved; a large amount of space is arranged in the structure, the structure is not easy to compact, the compression and compaction strain of the structure is prolonged, and the energy absorption stroke is improved; and a large amount of ripples directly participate in plastic deformation in the large deformation process of the structure, so that the structure has higher platform stress, and the energy absorption capacity is further strengthened. Under the action of an out-of-plane compressive load, the peak stress of the corrugated-Ori multi-level sandwich energy absorption structure is improved by 34.56 percent compared with the corresponding equal-mass Miura-Ori folded paper sandwich board structure, the densification strain is improved by about 94.83 percent, and the energy absorption is improved by about 342.23 percent.
Furthermore, the primary structure of the corrugated-folded multi-level structure unit cell is a paper folding structure, the secondary structure is a corrugated structure, the two structures are bearing structures with high competitiveness in engineering, the structural form is simple, the geometric parameters are clear, the research is sufficient, and the corrugated-folded multi-level structure unit cell is easy to manufacture and popularize.
Furthermore, the four inclined corrugated sandwich plates comprise two face plates and a corrugated core body between the face plates, the corrugated core body provides powerful support for the two face plates, so that the bearing capacity of the structure is improved in the initial stage of loading, and in the post-bending process of the structure, the corrugated core body deforms greatly to form a considerable number of plastic hinges, so that the energy absorption capacity of the structure is improved.
Furthermore, the top view of the four inclined corrugated sandwich plates is in a herringbone shape, the included angle is 60-120 degrees, and when the design and the manufacture are convenient, the inclined corrugated plates on two sides of the herringbone shape can generate enough restraint and interaction due to folding, so that the buckling resistance of the structure is improved, the deformation area in the large deformation process is enlarged, and the energy absorption capacity of the structure is improved.
Furthermore, the direction of a corrugated channel introduced by the structure is adjustable, so that the structure performance adjustment design and the multifunctional integration are facilitated.
Furthermore, the corrugation form introduced by the structure is triangular, trapezoidal, sinusoidal or hat-shaped, so that the flexibility is high, and the designability of the structure performance is improved.
The invention also discloses a preparation method of the corrugated-folded paper multi-level sandwich energy absorption structure, which adopts a 3D printing technology to realize integrated molding of the structure, so that the corrugated-folded paper multi-level sandwich energy absorption structure can realize complex configuration design and adjustment, the design and flexibility are enhanced, the preparation steps are simplified, the labor and the time are saved, and meanwhile, the risk of reducing the interface connection strength between the traditional core body and the upper and lower panels and the complex multi-process circulation are avoided.
Furthermore, 3D printing can adopt various 3D printing manufacturing technologies such as Selective Laser Melting (SLM), Selective Laser Sintering (SLS), Electron Beam Melting (EBM) and the like, and the flexibility and the selectivity are strong; 3D prints metal powder raw materials and chooses for use in a flexible way, can full play material advantage and then promote structural performance.
In conclusion, the invention realizes the composite design and preparation of the corrugated and paper folding structure, obtains the corrugated-paper folding multi-level sandwich energy absorption structure, has the characteristics of high bearing capacity, high buckling resistance and strong energy absorption capacity, has strong designability and flexible preparation, and has wide application prospect in the fields of aerospace, ships, high-end equipment and national defense and military.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic view of a corrugated-folded paper multi-level sandwich energy absorption structure of the present invention;
FIG. 2 is a schematic diagram of a core unit cell structure in the corrugated-paper folding multi-level sandwich energy absorption structure of the present invention;
FIG. 3 is a schematic structural diagram of different corrugation forms introduced into the corrugated secondary structure of the core in the corrugated-folded paper multi-level sandwich energy-absorbing structure of the present invention, wherein (a) is triangular corrugation, (b) is trapezoidal corrugation, (c) is sine corrugation, and (d) is hat corrugation;
fig. 4 is a stress-strain curve and an energy absorption efficiency curve graph of the corrugated-Ori paper multi-level sandwich energy absorption structure and the corresponding equal-mass conventional Miura-Ori paper sandwich board under the out-of-plane compressive load.
Wherein: 1. an upper panel; 2. a lower panel; 3. a corrugated-folded multi-stage structural core; 4. a corrugated sandwich panel; 5. a cover panel of the corrugated sandwich panel; 6. a corrugated core of a corrugated sandwich panel.
Detailed Description
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "one side", "one end", "one side", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of 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. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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.
Various structural schematics according to the disclosed embodiments of the invention are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the present invention provides a corrugated-folded paper multi-level sandwich energy absorption structure and a method for manufacturing the same, including an upper panel 1, a lower panel 2, and a core 3 of the corrugated-folded paper multi-level sandwich energy absorption structure; the corrugated-folded paper multi-stage structural core 3 comprises a plurality of corrugated-folded multi-stage structural unit cells which are periodically arranged between an upper panel 1 and a lower panel 2; the upper panel 1 and the lower panel 2 are single-layer panels and are connected with a corrugated-paper folding multi-stage structure core body 3 in the middle, and the whole structure is integrally formed by adopting a 3D printing technology.
Referring to fig. 2, each corrugated-paper folding multi-stage structure unit cell of the corrugated-folding multi-stage structure core 3 includes a two-stage structure, the first-stage structure is a paper folding configuration, the second-stage structure is a corrugated sandwich panel 4, the corrugated sandwich panel 4 includes four corrugated sandwich panels 4, and the four corrugated sandwich panels 4 are all obliquely arranged; four edge lines are formed at the joint of the left and right adjacent corrugated sandwich plates 4, wherein two edge lines at the inner side are intersected at the panel; the included angles between the four ridge lines and the lower panel 2 are the same and are 30-60 degrees; the top view of the corrugated-paper folding multi-stage structure unit cell in the core body is in a herringbone structure, and the included angle of the herringbone is 60-120 degrees.
The corrugated sandwich panel 4 comprises a cover panel 5 of the corrugated sandwich panel and a corrugated core 6 of the corrugated sandwich panel, the corrugated core 6 of the corrugated sandwich panel is arranged between the cover panels 5 of the two corrugated sandwich panels, the cover panel 5 of the corrugated sandwich panel is a single-layer panel, the specific form and the channel direction of the corrugated core 6 of the corrugated sandwich panel are adjustable, and the channel direction is preferably a horizontal direction in the embodiment.
Referring to fig. 3, a corrugated plate constituting a core-structured unit cell has an adjustable corrugation form, and a schematic diagram of a corrugated-folded multi-stage unit cell in different forms of a corrugated core 6 of a corrugated sandwich plate is shown, in which (a) is a corrugated-folded multi-stage unit cell based on triangular corrugations, (b) is a corrugated-folded multi-stage unit cell based on trapezoidal corrugations, (c) is a corrugated-folded multi-stage unit cell based on sinusoidal corrugations, and (d) is a corrugated-folded multi-stage unit cell based on hat corrugations.
The invention relates to a preparation method of a ripple-folded paper multilevel sandwich energy absorption structure, which comprises the following steps of firstly drawing a data model of the ripple-folded paper multilevel sandwich energy absorption structure, then slicing the digital cross section of the data model to obtain slice data, guiding the slice data into a 3D printer, selecting metal powder raw materials according to the situation, and integrally processing and forming the metal powder raw materials through the 3D printer to obtain the ripple-folded paper multilevel sandwich energy absorption structure, wherein the specific steps are as follows:
s1, determining relevant adjustable geometric parameters of the corrugated-origami multilevel sandwich energy absorption structure according to specific needs and actual conditions, drawing a three-dimensional data model of the structure through commercial three-dimensional modeling software SolidWorks, converting the obtained three-dimensional data model into STL format data and exporting the STL format data;
relevant adjustable geometric parameters include but are not limited to the length of two sides of the inclined corrugated plate in the primary paper folding structure, the included angle between the inclined corrugated plate and the horizontal plane, the herringbone included angle, the independent geometric parameters of the secondary corrugated structure under a specific corrugated shape, the thickness of the panel and the thickness of the corrugation.
S2, importing the STL format data obtained in the step S1 into commercial model subdivision software Cura, and carrying out digital cross section slicing on the data model to obtain slice data of the three-dimensional data model;
s3, formulating technological parameters of the 3D printer according to specific needs and actual conditions, adjusting the power of the laser to be between dozens of watts and hundreds of watts, adjusting the scanning speed to be between 900-1500 mm/S, selecting appropriate metal powder raw materials such as nickel-based alloy spherical powder IN718, aluminum alloy spherical powder AlSi10Mg, stainless steel spherical powder 17-4PH and the like, and guiding the slice data of the three-dimensional data model obtained IN the step S2 into the 3D printer to print layer by layer to obtain the corrugated-origami multi-level sandwich energy absorption structure.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
Example 1
(1) And (3) drawing a three-dimensional data model of the corrugated-origami multi-level sandwich energy absorption structure by using commercial three-dimensional modeling software SolidWorks. The upper panel is a square plate, the side length is 60mm, and the thickness is 1 mm; the lower panel is a square plate, the side length is 60mm, and the thickness is 1 mm; the geometric model of the corrugated-folded paper multi-level structure unit cell forming the core body part is shown as a schematic diagram in figure 3(a), four ridge lines formed at the joint of the left and right adjacent corrugated sandwich plates form an acute angle of 60 degrees with the upper and lower panels, and the top view has a herringbone included angle of 90 degrees; aiming at the corrugated sandwich board with the secondary structure, the wall thickness of an external covering panel and a corrugated plate serving as a core body is 1mm, the corrugated core body is a 60-degree regular triangular corrugation, and the direction of a corrugated channel is in the horizontal direction. And converting the drawn three-dimensional data model into STL format data and exporting the STL format data.
(2) Importing the STL format data obtained in the last step into commercial model subdivision software Cura, and carrying out digital cross section slicing on the three-dimensional data model to obtain slice data of the three-dimensional data model;
(3) and importing the slice data of the three-dimensional data model obtained IN the last step into a BLT S310 model 3D printer, adopting a laser selective melting (SLM)3D printing technology, taking IN718 metal powder as a raw material, enabling the laser power to be 75W when a skin layer is printed, enabling the scanning speed to be 800mm/S, enabling the laser power to be 305W when filling, and enabling the scanning speed to be 960mm/S, and finally obtaining the integrally-formed corrugated-folded paper multi-level sandwich energy absorption structure.
Example 2
(1) And (3) drawing a three-dimensional data model of the corrugated-origami multi-level sandwich energy absorption structure by using commercial three-dimensional modeling software SolidWorks. The upper panel is a square plate, the side length is 60mm, and the thickness is 0.5 mm; the lower panel is a square plate with the side length of 60mm and the thickness of 0.5 mm; the geometric model of the corrugated-folded paper multi-level structure unit cell forming the core body part is shown as a schematic diagram in fig. 3(b), four edge lines formed at the joint of the left and right adjacent corrugated sandwich plates form an acute angle of 30 degrees with the upper and lower panels, and the top view has a herringbone included angle of 60 degrees; aiming at the corrugated sandwich board with the secondary structure, the wall thickness of an external covering panel and a corrugated plate serving as a core body is 0.5mm, the corrugated core body is 60-degree isosceles trapezoid corrugated, and the direction of a corrugated channel is in the horizontal direction. And converting the drawn three-dimensional data model into STL format data and exporting the STL format data.
(2) Importing the STL format data obtained in the last step into commercial model subdivision software Cura, and carrying out digital cross section slicing on the three-dimensional data model to obtain slice data of the three-dimensional data model;
(3) and importing the slice data of the three-dimensional data model obtained IN the last step into a BLT S310 model 3D printer, adopting a laser selective melting (SLM)3D printing technology, taking IN718 metal powder as a raw material, enabling the laser power to be 75W when a skin layer is printed, enabling the scanning speed to be 800mm/S, enabling the laser power to be 305W when filling, and enabling the scanning speed to be 960mm/S, and finally obtaining the integrally-formed corrugated-folded paper multi-level sandwich energy absorption structure.
Example 3
(1) And (3) drawing a three-dimensional data model of the corrugated-origami multi-level sandwich energy absorption structure by using commercial three-dimensional modeling software SolidWorks. The upper panel is a square plate, the side length is 60mm, and the thickness is 0.8 mm; the lower panel is a square plate, the side length is 60mm, and the thickness is 0.8 mm; the geometric model of the corrugated-folded paper multi-level structure unit cell forming the core body part is shown as a schematic diagram in figure 3(c), four ridge lines formed at the joint of the left and right adjacent corrugated sandwich plates form an acute angle of 45 degrees with the upper and lower panels, and the top view has a herringbone included angle of 120 degrees; aiming at the corrugated sandwich board with the secondary structure, the wall thickness of an external covering panel and a corrugated plate serving as a core body is 0.8mm, the corrugated core body is sine-shaped corrugation, and the direction of a corrugated channel is horizontal. And converting the drawn three-dimensional data model into STL format data and exporting the STL format data.
(2) Importing the STL format data obtained in the last step into commercial model subdivision software Cura, and carrying out digital cross section slicing on the three-dimensional data model to obtain slice data of the three-dimensional data model;
(3) and importing the slice data of the three-dimensional data model obtained in the last step into a 3DS 300 model 3D printer, adopting a laser selective melting (SLM)3D printing technology, taking 17-4PH metal powder as a raw material, enabling the power of the laser to be 150W all the time, enabling the scanning speed to be 1200mm/s, and finally obtaining the integrally formed corrugated-origami multi-stage energy-absorbing sandwich structure.
Example 4
(1) And (3) drawing a three-dimensional data model of the corrugated-origami multi-level sandwich energy absorption structure by using commercial three-dimensional modeling software SolidWorks. The upper panel is a square plate, the side length is 60mm, and the thickness is 1.5 mm; the lower panel is a square plate, the side length is 60mm, and the thickness is 1.5 mm; the geometric model of the corrugated-folded paper multi-level structure unit cell forming the core body part is shown as a schematic drawing in fig. 3(d), four edge lines formed at the joint of the left and right adjacent corrugated sandwich plates form an acute angle of 60 degrees with the upper and lower panels, and the top view has a herringbone included angle of 120 degrees; aiming at the corrugated sandwich board with the secondary structure, the wall thickness of an external covering panel and a corrugated plate serving as a core body is 1.5mm, the corrugated core body is hat-shaped corrugation, and the direction of a corrugated channel is horizontal. And converting the drawn three-dimensional data model into STL format data and exporting the STL format data.
(2) Importing the STL format data obtained in the last step into commercial model subdivision software Cura, and carrying out digital cross section slicing on the three-dimensional data model to obtain slice data of the three-dimensional data model;
(3) and importing the slice data of the three-dimensional data model obtained in the last step into a 3DS 300 model 3D printer, adopting a laser selective melting (SLM)3D printing technology, taking 17-4PH metal powder as a raw material, enabling the power of the laser to be 150W all the time, enabling the scanning speed to be 1200mm/s, and finally obtaining the integrally formed corrugated-origami multi-stage energy-absorbing sandwich structure.
Referring to fig. 4, the stress-strain curve of the corrugated-folded paper multi-level sandwich energy absorption structure is above the stress-strain curve of the corresponding equal-mass Miura-Ori folded paper sandwich board, so that the coupling enhancement effect on the structure after the corrugated sandwich board is introduced as a secondary structure is embodied, and the bearing capacity, the buckling resistance and the energy absorption capacity of the structure are greatly improved; the peak value of the energy absorption efficiency curve of the corrugated-folded paper multi-level sandwich energy absorption structure is greatly prolonged compared with the peak value of the energy absorption curve of the corresponding equal-mass single-level Origami sandwich board, so that the densification strain point of the structure is improved, and the energy absorption stroke of the structure is increased.
The corrugated-folded paper multi-level sandwich energy absorption structure obtained according to the embodiment shows excellent comprehensive mechanical properties of high bearing capacity, buckling resistance and high-efficiency energy absorption due to the introduction of the corrugated-folded multi-level structure. Research and analysis show that under the action of an out-of-plane compressive load, at the initial stage of the load, due to the introduction of a corrugated-folded multi-stage structure, the boundary constraints of each substructure slab in the core body are mutually strengthened, the buckling resistance and the bearing performance of the structure are improved, the deformation mode of the structure is changed, and the compressive strength of the structure is improved; in the large deformation process, a large number of corrugated plates participate in plastic deformation to form plastic hinges, and the energy absorption capacity of the structure is greatly enhanced due to the fact that a large number of deformation spaces are arranged inside the structure and the densification strain of the structure is delayed. The peak stress of the corrugated-Ori multi-level sandwich energy absorption structure is improved by 34.56 percent compared with the corresponding equal-mass Miura-Ori folded sandwich plate structure, the densification strain is improved by about 94.83 percent, and the energy absorption is improved by about 342.23 percent.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The corrugated-paper folding multi-level sandwich energy absorption structure is characterized by comprising a corrugated-paper folding multi-level structure core body (3), wherein the corrugated-paper folding multi-level structure core body (3) comprises a plurality of corrugated-folding multi-level structure unit cells, the plurality of corrugated-folding multi-level structure unit cells are arranged between an upper panel (1) and a lower panel (2) in a periodic mode, the one-level structure of the corrugated-folding multi-level structure unit cells is a paper folding structure, the second-level structure of the corrugated-folding multi-level structure unit cells is a corrugated structure, and each corrugated-folding multi-level structure unit cell comprises four corrugated sandwich panels (4) which are obliquely arranged.
2. The corrugated-folded paper multi-stage sandwich energy absorption structure as claimed in claim 1, wherein the corrugated sandwich plates (4) adjacent to each other at the left and right in the corrugated-folded multi-stage structure unit cell form four edge lines together at the joint, the two inner edge lines intersect at the upper panel (1) and the lower panel (2), and acute angles formed between the four edge lines and the lower panel (2) are the same and are 30-60 degrees.
3. The corrugated-folded paper multi-sandwich energy absorbing structure of claim 2, wherein the corrugated-folded multi-stage structural unit cells are symmetrically distributed about a medial axis passing through four ridges.
4. The corrugated-folded paper multi-stage sandwich energy absorption structure as claimed in claim 1, wherein the top view of the corrugated-folded multi-stage structural unit cell is in a herringbone shape, and the included angle of the herringbone is 60-120 degrees.
5. The corrugated-origami multi-sandwich energy absorbing structure according to claim 1, characterized in that the corrugated channels in the corrugated sandwich panel (4) are adjustable.
6. The corrugated-origami multi-sandwich energy absorbing structure according to claim 1, characterized in that the corrugations inside the corrugated sandwich panel (4) are triangular, trapezoidal, sinusoidal or hat-shaped.
7. The corrugated-origami multilevel sandwich energy absorbing structure according to claim 1, characterized in that the upper panel (1) and the lower panel (2) are both single-layer panels.
8. The method for preparing the corrugated-origami multilevel sandwich energy-absorbing structure of claim 1, characterized by firstly drawing a data model of the corrugated-origami multilevel sandwich energy-absorbing structure, then slicing the digital cross section of the data model to obtain slice data, guiding the slice data into a 3D printer, selecting metal powder raw materials according to the situation, and integrally processing and molding the metal powder raw materials through the 3D printer to obtain the corrugated-origami multilevel sandwich energy-absorbing structure.
9. The method of claim 8, comprising the steps of:
s1, determining relevant adjustable geometric parameters of the corrugated-folded paper multi-level sandwich energy absorption structure, drawing a three-dimensional data model of the corrugated-folded paper multi-level sandwich energy absorption structure, converting the three-dimensional data model into STL format data and exporting the STL format data, wherein the relevant adjustable geometric parameters comprise two side lengths of an inclined corrugated plate in a first-level folded paper structure, an acute angle formed by the inclined corrugated plate and a horizontal plane, a herringbone included angle, independent geometric parameters of a second-level corrugated structure in a specific corrugated shape, panel thickness and corrugated thickness;
s2, carrying out digital cross section slicing on the data model of the STL format data obtained in the step S1 to obtain slice data of the three-dimensional data model;
s3, determining 3D printing process parameters, selecting metal powder raw materials, and performing 3D layer-by-layer printing according to the slice data of the three-dimensional data model obtained in the step S2 to obtain the corrugated-folded paper multi-level sandwich energy absorption structure.
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| CN112800553A (en) * | 2021-01-04 | 2021-05-14 | 中国科学院力学研究所 | Multistage controllable gradual energy-absorbing lattice structure |
| CN113844112A (en) * | 2021-09-28 | 2021-12-28 | 东南大学 | Composite honeycomb material |
| CN113878865A (en) * | 2021-10-09 | 2022-01-04 | 浙江大学 | 3D printing method for paper folding structure |
| CN113895128A (en) * | 2021-09-15 | 2022-01-07 | 浙江理工大学 | Paper buffer type panel with two-way ripple structure sandwich layer |
| CN114394058A (en) * | 2021-12-28 | 2022-04-26 | 广州大学 | Curved surface paper folding tube structure with good buffering energy-absorbing characteristic |
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