CN109572070B - Foam-filled hollow circular tube pyramid lattice sandwich board and preparation method thereof - Google Patents
Foam-filled hollow circular tube pyramid lattice sandwich board and preparation method thereof Download PDFInfo
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- CN109572070B CN109572070B CN201910008600.5A CN201910008600A CN109572070B CN 109572070 B CN109572070 B CN 109572070B CN 201910008600 A CN201910008600 A CN 201910008600A CN 109572070 B CN109572070 B CN 109572070B
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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 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
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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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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
- B32B3/266—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 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 an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/08—Interconnection of layers by mechanical means
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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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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Abstract
The invention discloses a foam-filled hollow circular tube pyramid lattice sandwich board and a preparation method thereof, wherein hollow inclined circular tubes are inserted into inclined circular hole plates in an upper panel and a lower panel and are subjected to vacuum brazing or laser welding; then inserting the solid inclined foam column into the hollow inclined circular tube, wherein the foam and the circular tube are connected by glue; and finally, connecting a solid plate outside the upper and lower inclined circular hole plates by laser welding or gluing to obtain the foam-filled hollow circular tube pyramid lattice sandwich plate. The invention realizes the composite preparation of the hollow circular tube pyramid lattice structure and the foam material, and the foam-filled hollow circular tube pyramid lattice sandwich board has the characteristics of strong bearing, anti-buckling and energy absorption capacities, and has wide application prospects in the fields of transportation, high-end equipment and national defense and military.
Description
Technical Field
The invention belongs to the technical field of aerospace, and particularly relates to a foam-filled hollow circular tube pyramid lattice sandwich board and a preparation method thereof.
Background
The ultra-light porous material is a novel multifunctional material which appears along with the rapid development of material preparation and machining technology in recent years, and has the characteristic of structural and functional integration. The core body has high porosity, and can be roughly divided into two categories of disorder and order according to different microstructure rule degrees, wherein the former category comprises foamed materials (such as metal foams, organic foams, ceramic foams and plant fiber foams), and the latter category mainly comprises two-dimensional lattice structures (such as honeycomb structures, corrugated plate structures and full-triangular structures) and three-dimensional truss structures (such as tetrahedral structures, pyramid structures and square straight rod structures). The hollow circular tube lattice truss structure is one of the accepted optimal structures under various loading conditions, and the lightweight porous material with the hollow circular tube lattice topological structure has better compression performance than an equivalent solid lattice truss structure due to the good resistance to elastic-plastic buckling.
Due to the complexity of the microstructure of the foam material, various defects such as cell wall bending, missing, uneven aperture, overlarge and irregular gaps are inevitably generated in the preparation process of the foam material, which greatly influences the mechanical property of the foam material and shows that the stress of a compression platform is reduced, so that the bearing capacity of the foam material is seriously restricted. The lattice structure is formed by a series of regular single cell structures which are periodically arranged according to a certain topological rule, the core rod piece is mainly axially deformed when the structure bears, so the bearing capacity of the lattice structure is obviously higher than that of a foam material, and when the lattice structure reaches peak stress, the bearing capacity of the structure is rapidly and greatly reduced or even lost due to local buckling or integral buckling deformation of the core rod piece units. The two materials are compounded, so that the integration of the advantageous properties of the two materials can be realized, the defects of respective mechanical properties are overcome, and a novel composite structure with greatly improved mechanical properties is obtained.
Disclosure of Invention
The invention aims to solve the technical problem of providing a foam-filled hollow circular tube pyramid lattice sandwich board and a preparation method thereof, aiming at overcoming the defects in the prior art, and the foam-filled hollow circular tube pyramid lattice sandwich board is prepared by compounding a foam material and a hollow circular tube pyramid lattice structure together, so that the foam material has the characteristics of excellent bearing, buckling resistance and energy absorption.
The invention adopts the following technical scheme:
a foam-filled hollow circular tube pyramid lattice sandwich panel comprises an upper panel and a lower panel, wherein a core is arranged between the upper panel and the lower panel; the core comprises a plurality of pyramid lattice structure unit cells; each pyramid lattice unit cell comprises a plurality of hollow inclined circular tubes and a plurality of solid inclined foam columns.
Specifically, upper panel and lower panel are double-deck panel, and the upper panel includes first solid board and first round hole board, and the lower panel includes second solid board and second round hole board.
Furthermore, round holes with inclined orifices are formed in the first round hole plate and the second round hole plate.
Furthermore, the round holes on the first round hole plate and the second round hole plate are arranged periodically.
Furthermore, the inclined angle of the orifice of the circular hole is 30-60 degrees.
Furthermore, two ends of each hollow inclined circular tube are respectively inserted into the corresponding first circular hole plate and the corresponding second circular hole plate; one end of each solid inclined foam column is inserted into the corresponding hollow inclined circular tube.
Specifically, each pyramid lattice unit cell comprises four hollow inclined circular tubes and four solid inclined foam columns.
Furthermore, the inclination angle of the pipe orifice of the hollow inclined circular pipe and the solid inclined foam column is 30-60 degrees, and the pipe diameter is 15-40 mm.
The invention also discloses a preparation method of the foam-filled hollow circular tube pyramid lattice sandwich board, which comprises the following steps of obliquely inserting hollow inclined circular tubes into a first circular hole plate and a second circular hole plate in an upper panel and a lower panel, and carrying out vacuum brazing or laser welding; then obliquely inserting the solid oblique foam column into the hollow circular tube, wherein the solid oblique foam column is connected with the hollow oblique circular tube by glue joint; and finally, correspondingly connecting the first solid plate and the second solid plate outside the first round hole plate and the second round hole plate by laser welding or gluing to obtain the foam-filled hollow circular tube pyramid lattice sandwich plate.
Specifically, the method comprises the following steps:
s1, cutting the two metal plates and forming inclined circular holes which are periodically arranged on the metal plates to obtain a first circular hole plate and a second circular hole plate, and cutting two solid plates which have the same size as the first circular hole plate and the second circular hole plate to obtain a first solid plate and a second solid plate;
s2, cutting to prepare a hollow inclined circular tube, and cutting blocky foamed aluminum/PMI foam into a solid inclined foam column matched with the inner diameter of the hollow circular tube by using a linear cutting technology/thermal resistance wire cutting technology;
s3, inserting the two ends of the hollow inclined circular tube prepared in the step S2 into the first circular hole plate and the second circular hole plate respectively, and performing vacuum brazing or laser welding at the contact part of the hollow inclined circular tube and the panels of the first circular hole plate and the second circular hole plate, wherein the vacuum degree of the vacuum brazing is 10-2～10-3Pa, heating from room temperature to 900 ℃ at the speed of 1 ℃/min, preserving the heat for 10min to 1h, and then cooling to room temperature;
s4, heating the casting glue A and B to be softened in a ratio of 1:1, uniformly coating the mixture on the surface of the solid inclined foam column and the inner wall of the hollow inclined circular tube, inserting the solid inclined foam column into the hollow inclined circular tube along a circular hole in the first circular hole plate, and curing for 2-3 hours at a constant temperature of 60 ℃;
and S5, connecting the first solid plate with the first round hole plate and connecting the second solid plate with the second round hole plate by adopting a laser welding or gluing mode to obtain the foam-filled hollow round tube pyramid lattice sandwich plate.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention relates to a foam-filled hollow circular tube pyramid lattice sandwich board, which is characterized in that a core consisting of a plurality of pyramid lattice structural unit cells is arranged between an upper panel and a lower panel, and each pyramid lattice structural unit cell comprises a hollow inclined circular tube and a solid inclined foam column; each hollow inclined circular pipe in the core is inserted into the inclined circular hole plates in the upper panel and the lower panel; each solid inclined foam column in the core is inserted into the hollow inclined circular tube, and under the action of out-of-plane compression and in-plane shear load, the deformation mode of the structure is changed due to the contact coupling effect between the foam filler and the core tube, so that the mechanical property of the foam-filled hollow circular tube pyramid composite structure is remarkably improved compared with that of a hollow pyramid lattice structure. Under the action of an out-of-plane compressive load, the peak stress of the foam-filled hollow circular tube pyramid composite structure is improved by 45.2% compared with that of a corresponding hollow pyramid lattice structure, and the energy absorption is improved by about 100%. Under the action of in-plane shear load, the peak stress of the foam-filled hollow circular tube pyramid composite structure is improved by 41.7 percent compared with the corresponding hollow pyramid lattice structure, and the energy absorption is improved by about 80 percent
Furthermore, the upper panel and the lower panel are both double-layer panels, the outer sides of the upper panel and the lower panel are solid plates, and inclined round holes are formed in the inner side plates, so that the core pyramid pipe fitting can be embedded conveniently, and the connection between the core pyramid pipe fitting and the panels is facilitated.
Furthermore, the circular holes are periodically arranged to form a periodic structure, so that the best advantage of the structure is brought into play.
The invention also discloses a preparation method of the foam-filled hollow circular tube pyramid lattice sandwich board, so that the foam-filled hollow circular tube pyramid lattice sandwich board has strong designability and flexibility, the bearing capacity of the panel is effectively improved on the premise of keeping the quality of the panel unchanged, the preparation steps are simplified, and the labor and the time are saved. In conclusion, the invention realizes the composite preparation of the hollow circular tube pyramid lattice structure and the foam material, has the characteristics of strong bearing, buckling resistance and energy absorption capacity, and has wide application prospect in the fields of transportation, 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 structural view of a foam-filled hollow circular tube pyramid lattice sandwich panel according to the present invention;
FIG. 2 is a stress-strain curve graph of a PMI foam filled hollow circular tube pyramid lattice sandwich board, a hollow circular tube pyramid lattice sandwich board and a PMI foam pyramid structure under an out-of-plane compressive load according to the present invention;
fig. 3 is a stress-strain curve diagram of the PMI foam filled hollow circular tube pyramid lattice sandwich panel, the hollow circular tube pyramid lattice sandwich panel and the PMI foam pyramid structure under an in-plane shear load.
Wherein: 1. a first solid plate; 2. a first circular orifice plate; 3. a second circular orifice plate; 4. a second solid plate; 5. a hollow circular tube; 6. a foam column.
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.
Referring to fig. 1, the present invention provides a foam-filled hollow circular tube pyramid lattice sandwich panel, which comprises an upper panel, a lower panel and a core; the core is arranged between the upper panel and the lower panel; the pyramid lattice unit cell consists of a plurality of pyramid lattice unit cells; each pyramid lattice structure unit cell comprises a plurality of hollow inclined circular tubes 5 and solid inclined foam columns 6, and the hollow inclined circular tubes 5 and the solid inclined foam columns 6 are arranged in an inclined mode.
The upper panel is a double-layer panel and consists of a first solid plate 1 and a first round hole plate 2; the lower panel is a double-layer panel and consists of a second solid plate 4 and a second round hole plate 3; round holes with inclined orifices are formed in the first round hole plate 2 and the second round hole plate 3, the inclined angles of the orifices are 30-60 degrees, and the round holes are arranged on the first round hole plate 2 and the second round hole plate 3 periodically.
The number of the hollow inclined circular tubes 5 and the number of the solid inclined foam columns 6 are four, the inclination angles of the tube openings of the hollow inclined circular tubes 5 and the solid inclined foam columns 6 are 30-60 degrees, and the tube diameters are 15-40 mm.
Two ends of a hollow inclined circular tube 5 in the pyramid lattice structure unit cell in the core are respectively inserted into the corresponding first circular hole plate 2 and the second circular hole plate 3; the solid inclined foam columns 6 in each pyramid lattice unit cell in the core are inserted into the corresponding hollow inclined circular tubes 5.
The first solid plate 1, the first round hole plate 2, the second solid plate 3, the second round hole plate 4 and the hollow inclined round pipe 5 are made of aluminum alloy, titanium alloy or stainless steel; the solid inclined foam column 6 is made of foamed aluminum or PMI foam.
The invention relates to a preparation method of a foam-filled hollow circular tube pyramid lattice sandwich plate, which comprises the steps of inserting a hollow inclined circular tube into inclined circular hole plates in an upper panel and a lower panel, and performing vacuum brazing or laser welding; then inserting the solid inclined foam column into the hollow inclined circular tube, wherein the foam and the circular tube are connected by glue; and finally, connecting a solid plate outside the circular hole plate with the inclination at the upper and lower parts by laser welding or gluing to obtain the foam-filled hollow circular tube pyramid dot matrix sandwich plate, which comprises the following specific steps:
s1, cutting the two metal plates, punching inclined circular holes which are periodically arranged at positions calculated in advance to prepare an inclined circular hole plate 2 and an inclined circular hole plate 3, and cutting two solid plates which have the same size as the inclined circular hole plate 2 and the inclined circular hole plate 3 to prepare a solid plate 1 and a solid plate 4;
s2, cutting by using a numerical control cutting machine to obtain a hollow inclined circular tube 5, and cutting blocky foamed aluminum/PMI foam into a solid inclined foam column 6 matched with the inner diameter of the hollow circular tube by using a linear cutting technology/thermal resistance wire cutting technology;
s3, inserting the hollow inclined round tube 5 into the inclined round hole plate 2 and the inclined round hole plate 3, and performing vacuum brazing or laser welding at the contact part of the round tube and the panel;
s4, placing the casting glue A and the casting glue B in a 101-3 type electric heating blowing drying oven to be heated and softened, mixing the materials according to the proportion of 1:1, uniformly coating the mixture on the surface of the solid inclined foam column 6 and the inner wall of the hollow inclined circular tube 5, inserting the solid inclined foam column 6 into the hollow inclined circular tube 5 along the hole in the inclined circular hole plate 2, placing the mixture in the electric heating blowing drying oven, and curing the mixture for 2 hours at the constant temperature of 60 ℃;
and S5, connecting the solid plate 1 with the circular hole plate 2 with the inclination by adopting a laser welding or gluing mode, and connecting the solid plate 3 with the circular hole plate 4 with the inclination to obtain the foam filled hollow circular tube pyramid lattice sandwich plate.
The vacuum brazing mode takes stainless steel as an example, and the vacuum degree is 10-2～10-3Pa, heating from room temperature to 900 ℃ at the speed of 1 ℃/min, preserving the heat for 10 min-1 h, and then cooling to room temperature.
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) Cutting 4 square 2024-T3 aluminum alloy plates with the thickness of 2mm and the side length of 100 mm. The two square plates are a first solid plate 1 and a second solid plate 4; cutting 45-degree inclined round holes (4 inclined round holes in each plate) on the other two square plates according to the position calculated in advance to obtain a first round hole plate 2 and a second round hole plate 3 with the inclined round holes;
(2) cutting by a numerical control cutting machine to obtain a 2024-T3 aluminum alloy hollow inclined circular tube 5 with the tube diameter of 25mm and the tube orifice inclination angle of 45 degrees, and cutting the blocky PMI foam into a solid inclined foam column 6 matched with the inner diameter of the hollow circular tube by a thermal resistance wire cutting technology;
(3) inserting a 2024-T3 aluminum alloy hollow inclined round tube 5 into a first round hole plate 2 and a second round hole plate 3 with inclined round holes, and performing laser welding at the contact part of the round tube and the panel;
(4) placing the casting glue A and the casting glue B in a 101-3 type electrothermal blowing drying oven to be heated and softened, mixing the glue A and the glue B according to a ratio of 1:1, uniformly coating the mixture on the surface of a solid inclined PMI foam column 6 and the inner wall of a hollow inclined circular tube 5 made of 2024-T3 aluminum alloy, inserting the solid inclined foam column 6 into the hollow inclined circular tube 5 along a hole in a first circular hole plate 2 with an inclined circular hole, placing the hollow inclined circular tube 5 in the electrothermal blowing drying oven, and curing the hollow inclined circular tube 5 for 2 hours at a constant temperature of 60 ℃;
(5) and (3) connecting the 2024-T3 aluminum alloy first solid plate 1 with the second round hole plate 2 with the inclined round holes by adopting an adhesive manner, and connecting the 2024-T3 aluminum alloy second solid plate 4 with the second round hole plate 3 with the inclined round holes to obtain the PMI foam filled 2024-T3 aluminum alloy hollow round tube pyramid lattice sandwich plate.
Example 2
(1) 4 square plates of 304 stainless steel with a thickness of 2mm and a side length of 100mm were cut. The two square plates are a first solid plate 1 and a second solid plate 4; cutting 60-degree inclined round holes (4 inclined round holes in each plate) in the other two square plates according to the position calculated in advance to obtain a first round hole plate 2 and a second round hole plate 3 with the inclined round holes;
(2) cutting by using a numerical control cutting machine to obtain a 304 stainless steel hollow inclined circular tube 5 with the tube diameter of 25mm and the tube orifice inclination angle of 60 degrees, and cutting the massive PMI foam into a solid inclined foam column 6 matched with the inner diameter of the hollow circular tube by using a thermal resistance wire cutting technology;
(3) inserting a 304 stainless steel hollow inclined circular tube 5 into the first circular hole plate 2 and the second circular hole plate 3 with inclined circular holes, and performing laser welding at the contact part of the circular tube and the panel;
(4) placing the casting glue A and the casting glue B in a 101-3 type electric heating blowing drying oven to be heated and softened, mixing the glue A and the glue B according to a ratio of 1:1, uniformly coating the mixture on the surface of a PMI solid inclined foam column 6 and the inner wall of a 304 stainless steel hollow inclined circular tube 5, inserting the solid inclined foam column 6 into the hollow inclined circular tube 5 along a hole in a first circular hole plate 2 with an inclined circular hole, placing the mixture in the electric heating blowing drying oven, and curing the mixture for 2 hours at a constant temperature of 60 ℃;
(5) and (3) connecting the 304 stainless steel first solid plate 1 with the first round hole plate 2 with the inclined round hole by adopting an adhesive mode, and connecting the 304 stainless steel second solid plate 4 with the second round hole plate 3 with the inclined round hole to obtain the PMI foam filled 304 stainless steel hollow round tube pyramid lattice sandwich plate.
Example 3
(1) 4 square plates of 304 stainless steel with a thickness of 2mm and a side length of 100mm were cut. The two square plates are a first solid plate 1 and a second solid plate 4; cutting 45-degree inclined round holes (4 inclined round holes in each plate) on the other two square plates according to the position calculated in advance to obtain a first round hole plate 2 and a second round hole plate 3 with the inclined round holes;
(2) cutting by a numerical control cutting machine to obtain a 304 stainless steel hollow inclined circular tube 5 with the tube diameter of 40mm and the tube orifice inclination angle of 45 degrees, and cutting blocky closed-cell foamed aluminum into a solid inclined foam column 6 matched with the inner diameter of the hollow circular tube by a thermal resistance wire cutting technology;
(3) inserting a 304 stainless steel hollow inclined circular tube 5 into the first circular hole plate 2 and the second circular hole plate 3 with inclined circular holes, and connecting the circular tube with the inclined circular hole plates through vacuum brazing;
(4) placing the casting glue A and the casting glue B in a 101-3 type electric heating blowing drying oven to be heated and softened, mixing the materials in a ratio of 1:1, uniformly coating the mixture on the surface of a solid inclined closed-pore foamed aluminum column 6 and the inner wall of a 304 stainless steel hollow inclined circular tube 5, inserting the solid inclined foamed column 6 into the hollow inclined circular tube 5 along a hole in a first circular hole plate 2 with an inclined circular hole, placing the hollow inclined circular tube 5 in the electric heating blowing drying oven, and curing the mixture for 2 hours at a constant temperature of 60 ℃;
(5) and (3) connecting a 304 stainless steel first solid plate 1 with a first round hole plate 2 with an inclined round hole by adopting a laser welding mode, and connecting a 304 stainless steel second solid plate 4 with a second round hole plate 3 with an inclined round hole to obtain the closed-cell foamed aluminum filled 304 stainless steel hollow round tube pyramid lattice sandwich plate.
Example 4
(1) Cutting 4 square 2024-T3 aluminum alloy plates with the thickness of 2mm and the side length of 100 mm. The two square plates are a first solid plate 1 and a second solid plate 4; cutting 30-degree inclined round holes (4 inclined round holes in each plate) in the other two square plates according to the position calculated in advance to obtain a first round hole plate 2 and a second round hole plate 3 with the inclined round holes;
(2) cutting by a numerical control cutting machine to obtain a 2024-T3 aluminum alloy hollow circular tube 5 with a tube diameter of 15mm and a tube opening inclination angle of 30 degrees, and cutting the blocky PMI foam into a solid inclined foam column 6 matched with the inner diameter of the hollow circular tube by a thermal resistance wire cutting technology;
(3) inserting a 2024-T3 aluminum alloy hollow inclined round tube 5 into the first round hole plate 2 and the second round hole plate 3, and performing laser welding at the contact part of the round tube and the panel;
(4) placing the casting adhesive A and the casting adhesive B in a 101-3 type electrothermal blowing drying oven to be heated and softened, mixing the materials in a ratio of 1:1, uniformly coating the mixture on the surface of a PMI solid inclined foam column 6 and the inner wall of a hollow inclined circular tube 5 made of 2024-T3 aluminum alloy, inserting the solid inclined foam column 6 into the hollow inclined circular tube 5 along a hole in a first circular hole plate 2 with an inclined circular hole, placing the hollow inclined circular tube 5 in the electrothermal blowing drying oven, and curing the mixture for 3 hours at a constant temperature of 60 ℃;
(5) and (3) connecting the 2024-T3 aluminum alloy first solid plate 1 with the first round hole plate 2 with the inclined round holes by adopting an adhesive manner, and connecting the 2024-T3 aluminum alloy second solid plate 4 with the second round hole plate 3 to obtain the PMI foam filled 2024-T3 aluminum alloy hollow round tube pyramid lattice sandwich plate.
Referring to fig. 2, the hatched part shows the coupling enhancement effect of the hollow circular tube pyramid lattice sandwich board and the PMI foam pyramid structure under out-of-plane compression, which greatly improves the compression load and energy absorption.
Referring to fig. 3, the hatched part shows the coupling enhancement effect of the hollow circular tube pyramid lattice sandwich board and the PMI foam pyramid structure under in-plane shearing, and the shearing load and the energy absorption are greatly improved.
According to the foam filling circular tube pyramid sandwich plate obtained by the embodiment, the structure can simultaneously exert the advantages of the foam material in the aspect of energy absorption and the advantages of the thin-wall metal pipe fitting in the pyramid lattice structure in the aspect of strength. Under the quasi-static compression and shearing working conditions, the introduction of the foam filler has a reinforcing effect on the core body and changes the crushing mode of the structure at the same time, so that the compression strength and the unit mass energy absorption of the structure are greatly increased.
Research and analysis show that under the action of out-of-plane compression and in-plane shear load, due to the contact coupling effect between the foam filler and the core pipe fitting, the deformation mode of the structure is changed, so that the mechanical property of the foam filled hollow circular tube pyramid composite structure is remarkably improved compared with that of a corresponding hollow pyramid lattice structure. Under the action of an out-of-plane compressive load, the peak stress of the foam-filled hollow circular tube pyramid composite structure is improved by 45.2% compared with that of a corresponding hollow pyramid lattice structure, and the energy absorption is improved by about 100%. Under the action of in-plane shear load, the peak stress of the foam-filled hollow circular tube pyramid composite structure is improved by 41.7 percent compared with the corresponding hollow pyramid lattice structure, and the energy absorption is improved by about 80 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 (4)
1. A foam-filled hollow circular tube pyramid lattice sandwich panel is characterized by comprising an upper panel and a lower panel, wherein a core is arranged between the upper panel and the lower panel; the core comprises a plurality of pyramid lattice structure unit cells; every pyramid lattice structure unit cell includes four hollow slope pipe (5) and four solid slope foam column (6), the mouth of pipe inclination of hollow slope pipe (5) and solid slope foam column (6) is 30 ~ 60, the pipe diameter is 15 ~ 40mm, top panel and lower panel are double-deck panel, the top panel includes first solid core plate (1) and first hole board (2), the equal periodic arrangement of round hole on first hole board (2) and second hole board (3), the lower panel includes second solid core plate (4) and second hole board (3), all open the round hole that has the drill way slope on first hole board (2) and second hole board (3), the drill way inclination of round hole is 30 ~ 60.
2. The foam-filled hollow circular tube pyramid lattice sandwich plate according to claim 1, wherein both ends of each hollow inclined circular tube (5) are respectively inserted into the corresponding first circular hole plate (2) and second circular hole plate (3); one end of each solid inclined foam column (6) is inserted into the corresponding hollow inclined circular tube (5).
3. The method for preparing the foam-filled hollow circular tube pyramid lattice sandwich board as claimed in claim 1, wherein the hollow inclined circular tube is firstly inserted into the first circular hole plate and the second circular hole plate in the upper panel and the lower panel in an inclined manner, and then vacuum brazing or laser welding is carried out; then obliquely inserting the solid oblique foam column into the hollow circular tube, wherein the solid oblique foam column is connected with the hollow oblique circular tube by glue joint; and finally, correspondingly connecting the first solid plate and the second solid plate outside the first round hole plate and the second round hole plate by laser welding or gluing to obtain the foam-filled hollow circular tube pyramid lattice sandwich plate.
4. The preparation method of the foam-filled hollow circular tube pyramid lattice sandwich plate according to claim 3 is characterized by comprising the following specific steps of:
s1, cutting the two metal plates and forming inclined circular holes which are periodically arranged on the metal plates to obtain a first circular hole plate and a second circular hole plate, and cutting two solid plates which have the same size as the first circular hole plate and the second circular hole plate to obtain a first solid plate and a second solid plate;
s2, cutting to prepare a hollow inclined circular tube, and cutting blocky foamed aluminum/PMI foam into a solid inclined foam column matched with the inner diameter of the hollow circular tube by using a linear cutting technology/thermal resistance wire cutting technology;
s3, inserting the two ends of the hollow inclined circular tube prepared in the step S2 into the first circular hole plate and the second circular hole plate respectively, and performing vacuum brazing or laser welding at the contact part of the hollow inclined circular tube and the panels of the first circular hole plate and the second circular hole plate, wherein the vacuum degree of the vacuum brazing is 10-2～10-3Pa，Heating from room temperature to 900 ℃ at the speed of 1 ℃/min, preserving the heat for 10min to 1h, and then cooling to room temperature;
s4, heating the casting glue A and B to be softened in a ratio of 1:1, uniformly coating the mixture on the surface of the solid inclined foam column and the inner wall of the hollow inclined circular tube, inserting the solid inclined foam column into the hollow inclined circular tube along a circular hole in the first circular hole plate, and curing for 2-3 hours at a constant temperature of 60 ℃;
and S5, connecting the first solid plate with the first round hole plate and connecting the second solid plate with the second round hole plate by adopting a laser welding or gluing mode to obtain the foam-filled hollow round tube pyramid lattice sandwich plate.
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| Pyramidal lattice truss structures with hollow trusses;Douglas T;《Materials Science and Engineering》;20050228;全文 * |
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