CN102416716A - Pyramidal dot matrix core material with foam sandwich beam and preparation technology of core material - Google Patents

Abstract

A pyramidal lattice core material with foam sandwich beams and a preparation process thereof, relating to a pyramidal lattice core material and a preparation process thereof. The invention solves the problem that the existing composite lattice core material is prone to local buckling and reduces the ultimate compressive strength of the composite lattice core material under the condition of low density. A plurality of grooved sandwich corrugated strips of the present invention are interlocked and fixed to form a pyramid-shaped lattice core material. The process for preparing the core material is as follows: cutting the foam board into corrugated foam boards; Lay multi-layer upper fiber prepreg and multi-layer lower fiber prepreg respectively, and then put them under a hot press to pressurize, keep warm, and then cure and form; after forming, cut them into multiple strips of equal thickness Slotted corrugated strips; a plurality of slotted corrugated strips are interlocked and fixed to obtain a pyramid-shaped lattice core material. The invention is especially suitable for large area forming and engineering applications.

Description

Pyramid lattice core material with foam sandwich beam and its preparation process

technical field

The invention relates to a pyramid-shaped lattice core material and a preparation process thereof, in particular to a pyramid-shaped lattice core material with foam sandwich beams and a preparation process thereof.

Background technique

The carbon fiber composite lattice structure is considered to be the most promising sandwich structure core material due to its lightweight, high-strength structural performance and multifunctional potential in an open structure. As the preparation technology of this kind of composite material core material and its sandwich structure becomes more and more mature, this kind of lattice sandwich core material shows a wide range of application prospects in aerospace, transportation, energy and other fields. Pyramid lattice is one of the topological forms of lattice core materials, which has been widely studied due to its symmetrical structural form and structural performance comparable to other topological forms. As a class of advanced structural materials, the pyramid lattice of composite materials will continue to increase its specific stiffness and specific strength, which will expand the scope of material selection for engineering applications. The existing composite lattice core material is prone to local buckling under the condition of low density, which greatly reduces the ultimate compressive strength of the composite lattice core material.

Contents of the invention

The purpose of the present invention is to solve the problem that the existing composite material lattice core material is prone to local buckling under the condition of low density, which greatly reduces the ultimate compressive strength of the composite material lattice core material, and further provides a belt Pyramid lattice core material with foam sandwich beam and its preparation process.

The technical solution of the present invention is: a pyramid-shaped lattice core material with a foam sandwich beam includes a plurality of sandwich corrugated strips with grooves of equal thickness, and a plurality of sandwich corrugated strips with grooves are interlocked and fixed to form a Pyramid lattice core material, sandwich corrugated strips with grooves include corrugated foam board, multi-layer upper fiber prepreg and multi-layer lower fiber prepreg, the corrugated foam board is isosceles trapezoidal corrugated foam board, The multi-layer upper fiber prepreg and the multi-layer lower fiber prepreg are respectively laid on the upper end surface and the lower end surface of the corrugated foam board, and after laying, a fiber reinforced composite foam sandwich corrugated board is formed, and the fiber reinforced composite material The upper bottom of the foam sandwich corrugated board and the lower end of the lower bottom are provided with interlocking openings, and the fiber reinforced composite foam sandwich corrugated board with the interlocking openings is cut into multiple sandwich corrugated strips with grooves of equal thickness.

The present invention also provides a kind of preparation technology that prepares the pyramid-shaped lattice core material that has foam sandwich beam, and the specific process of described preparation technology is as follows:

Step 1: Cut the foam board into corrugated foam boards, the corrugated foam boards are isosceles trapezoidal corrugated foam boards;

Step 2: Lay multiple layers of upper fiber prepreg on the top of the corrugated foam corrugated board, lay multiple layers of lower fiber prepreg on the bottom of the corrugated foam corrugated board, and lay the corrugated foam corrugated board, multi-layer The upper fiber prepreg and the multi-layer lower fiber prepreg are placed under a hot press and pressurized to 0.4MPa-0.6MPa. Then, they are kept at 120°C-130°C for 2 hours and then cured. Finally, a fiber-reinforced composite is obtained. Material foam sandwich corrugated board;

Step 3: On the lower end of the upper bottom and the lower bottom of the fiber reinforced composite foam sandwich corrugated board in step 2, there are interlocking openings, and then the fiber reinforced composite foam sandwich corrugated board with the interlocking openings is cut Form a plurality of corrugated strips with slotted cores of equal thickness;

Step 4: Interlock and fix the plurality of sandwich corrugated strips with grooves in Step 3, and finally obtain a pyramid-shaped lattice core material with composite foam sandwich beams.

The present invention also provides a kind of preparation technology that prepares the pyramid-shaped lattice core material that has foam sandwich beam, and the specific process of described preparation technology is as follows:

Step 1: Lay multiple layers of upper fiber prepreg on the top of the flat foam board, lay multiple layers of lower fiber prepreg on the bottom of the flat foam board, place the flat foam board, multi-layer upper fiber prepreg and multi-layer lower fiber The fiber prepreg is placed under a hot press and pressurized to 0.4MPa-0.6MPa. Then, it is cured after being kept at 120°C-130°C for 2 hours. Finally, a fiber-reinforced composite foam sandwich panel is obtained;

Step 2: cutting the fiber-reinforced composite material foam sandwich panel in step 1 into fiber-reinforced composite material foam sandwich corrugated strips with interlocking openings;

Step 3: interlocking and fixing the fiber reinforced composite foam sandwich corrugated strips in step 2, finally obtaining a pyramid-shaped lattice core material with composite foam sandwich beams.

Compared with the prior art, the present invention has the following effects: 1. the composite material foam sandwich pyramid lattice core material of the present invention has a higher ultimate compressive strength than the full composite pyramid lattice of the same density under low density conditions 2 to 10 times. The invention provides a novel structural form for the lattice structure, enriches the material performance library of the lattice structure, and provides a simple and fast preparation process without material waste, and is especially suitable for large-area molding and engineering applications. 2. carry out selective out-of-plane compression experiment to the pyramidal lattice core material with composite material foam sandwich beam of the present invention, select density is 23.2kg/ ^m The structure core material, its flat compressive strength is 2.73MPa, However, when the existing all-composite material pyramidal lattice core material has a density of 19.4kg/m ³ , the flat compressive strength is 0.304MPa, effectively proving that the pyramidal lattice core material with composite foam sandwich beams is The structural performance at a certain density is higher than that of the existing full-composite pyramid lattice core material.

Description of drawings

Fig. 1 is a schematic diagram of a composite material foam sandwich corrugated board; Fig. 2 is a schematic diagram of a corrugated strip with grooves; Fig. 3 is a schematic diagram of interlocking of corrugated strips with a grooved core; Fig. 4 is a structure of a flat foam board 6 Schematic diagram; Fig. 5 is a schematic diagram of a fiber reinforced composite foam sandwich corrugated strip cut from a flat plate.

Detailed ways

Specific Embodiment 1: This embodiment is described in conjunction with Fig. 1 to Fig. 3. A pyramid-shaped lattice core material with a foam sandwich beam in this embodiment includes a plurality of corrugated strips with grooves of equal thickness, and a plurality of The sandwich corrugated strips with grooves are interlocked and fixed to each other to form a pyramid lattice core material. The corrugated sandwich strips with grooves include corrugated foam board 1, multi-layer upper fiber prepreg 2 and multi-layer lower fiber prepreg 3 The corrugated foam board 1 is an isosceles trapezoidal corrugated foam board 1, and the multi-layer upper fiber prepreg 2 and the multi-layer lower fiber prepreg 3 are respectively laid on the upper end surface and the lower end surface of the corrugated foam board 1 After laying, the fiber-reinforced composite foam sandwich corrugated board 4 is formed, and the lower ends of the upper and lower bottoms of the fiber-reinforced composite foam sandwich corrugated board 4 are provided with embedded locking openings 4-1, and will have embedded The fiber-reinforced composite material foam sandwich corrugated board 4 of the locking port 4-1 is cut into a plurality of grooved sandwich corrugated strips of equal thickness.

The length of the upper bottom of the isosceles trapezoid can be designed arbitrarily in order to improve the shear performance of the sandwich structure obtained from this type of core material.

Specific embodiment two: illustrate this embodiment in conjunction with Fig. 1 to Fig. 3, the concrete process of a kind of preparation technology of the pyramid lattice core material with foam sandwich beam of this embodiment is as follows:

Step 1: cutting the foam board into a corrugated foam board 1, the corrugated foam board 1 is an isosceles trapezoidal corrugated foam board 1;

Step 2: Lay multiple layers of upper fiber prepreg 2 on top of the corrugated foam corrugated board 1, and lay multiple layers of lower fiber prepreg 3 under the corrugated foam corrugated board 1, and lay the corrugated foam corrugated Board 1, multi-layer upper fiber prepreg 2 and multi-layer lower fiber prepreg 3 are placed under a hot press and pressurized to 0.4MPa-0.6MPa, and then kept at 120°C-130°C for 2 hours and then cured. , and finally, the fiber-reinforced composite foam sandwich corrugated board 4 is obtained;

Step 3: The upper bottom and the lower end of the lower bottom of the fiber reinforced composite foam sandwich corrugated board 4 in step 2 are provided with interlocking openings 4-1, and then the fiber reinforced composite materials with interlocking openings 4-1 are opened. The material foam sandwich corrugated board 4 is cut into a plurality of grooved sandwich corrugated strips 5 of equal thickness;

Step 4: Interlock and fix the plurality of sandwich corrugated strips 5 with grooves in Step 3, and finally obtain a pyramid-shaped lattice core material with composite foam sandwich beams.

Specific Embodiment 3: This embodiment is described with reference to FIGS. 1 to 3 . In step 2 of this embodiment, a multi-layer upper fiber prepreg 2 and a multi-layer lower fiber prepreg 3 are laid on the corrugated foam corrugated board 1 , the fiber laying directions on the upper fiber prepreg 2 and the lower fiber prepreg 3 are laid out symmetrically with the corrugated foam corrugated board 1 as the center, and the fiber laying angles of each layer of fiber prepreg are different. With such setting, the ultimate compressive strength under the condition of low density is 2-10 times higher than that of the pyramid lattice of the composite material with the same density. Other compositions and connections are the same as those in the third embodiment.

Specific Embodiment 4: This embodiment is described with reference to FIG. 3 . In step 4 of this embodiment, the fixing between the plurality of sandwich corrugated strips 5 with grooves is cemented with epoxy resin glue. Such setting effectively improves the resistance to stress. Other compositions and connections are the same as those in Embodiment 2, 3 or 4.

The method of locally strengthening the material through the sandwich structure of the present invention is also applicable to a pyramid lattice structure with a circular rod section.

Specific embodiment five: illustrate this embodiment in conjunction with Fig. 4 to Fig. 5, a kind of preparation technology of the pyramidal lattice core material with foam sandwich beam of this embodiment, the specific process of described preparation technology is as follows:

Step 1: Lay multi-layer upper fiber prepreg 2 on the flat foam board 6, lay multi-layer lower fiber prepreg 3 under the flat foam board 6, and lay flat foam board 6 and multi-layer upper fiber prepreg Material 2 and multi-layer lower fiber prepreg material 3 are placed under a hot press and pressurized to 0.4MPa-0.6MPa, then kept at 120°C-130°C for 2 hours and then cured to form, and finally, a fiber-reinforced composite material foam is obtained Sandwich panel 7;

Step 2: cutting the fiber-reinforced composite material foam sandwich panel 7 in step 1 into fiber-reinforced composite material foam sandwich corrugated strips 8 with interlocking openings 7-1;

Step 3: interlock and fix the fiber reinforced composite foam sandwich corrugated strips 8 in step 2, and finally obtain a pyramid-shaped lattice core material with composite foam sandwich beams.

Specific embodiment six: This embodiment is described in conjunction with FIG. 4. In step one of this embodiment, when laying multi-layer upper fiber prepreg 2 and multi-layer lower fiber prepreg 3 on flat foam board 6, the upper fiber prepreg The laying directions of the fibers on the prepreg 2 and the lower fiber prepreg 3 are laid out symmetrically with the flat foam board 6 as the center, and the fiber laying angles of each layer of the fiber prepreg are different. With such setting, the ultimate compressive strength under the condition of low density is 2-10 times higher than that of the pyramid lattice of the composite material with the same density. Other compositions and connections are the same as those in Embodiment 5.

Embodiment 7: This embodiment is described with reference to FIG. 3 . In Step 3 of this embodiment, in Step 3, the fixing between multiple fiber-reinforced composite foam sandwich corrugated strips 8 is cemented with epoxy resin glue. Such setting effectively improves the compressive strength. Other compositions and connections are the same as those in Embodiment 5 or 6.

Claims (7)

1. A pyramid-shaped lattice core material with foam sandwich beams, which includes a plurality of corrugated strips with grooves of equal thickness, and a plurality of corrugated strips with grooved cores are interlocked and fixed to form a pyramid lattice The core material is characterized in that: the sandwich corrugated strip with grooves comprises a corrugated foam board (1), a multi-layer upper fiber prepreg (2) and a multi-layer lower fiber prepreg (3), and the corrugated foam board (1) is an isosceles trapezoidal corrugated foam board (1), multi-layer upper fiber prepreg (2) and multi-layer lower fiber prepreg (3) are respectively laid on the corrugated foam board (1) The end face and the lower end face are laid to form a fiber-reinforced composite material foam sandwich corrugated board (4), and an embedded lock opening ( 4-1), and cutting the fiber-reinforced composite foam sandwich corrugated board (4) with the interlocking opening (4-1) into a plurality of corrugated strips with grooves of equal thickness. 2. a kind of preparation technology with the pyramid lattice core material of foam sandwich beam, it is characterized in that: the concrete process of described preparation technology is as follows: Step 1: cutting the foam board into a corrugated foam board (1), the corrugated foam board (1) being an isosceles trapezoidal corrugated foam board (1); Step 2: Lay multiple layers of upper fiber prepreg (2) on top of the corrugated foam corrugated board (1), and lay multiple layers of lower fiber prepreg (3) under the corrugated foam corrugated board (1) ), put the corrugated foam corrugated board (1), multi-layer upper fiber prepreg (2) and multi-layer lower fiber prepreg (3) under the hot press and press to 0.4MPa-0.6MPa, and then , heat-preserved at 120°C-130°C for 2 hours, then solidified and formed, and finally, a fiber-reinforced composite foam sandwich corrugated board (4) was obtained; Step 3: On the fiber-reinforced composite material foam sandwich corrugated board (4) in step 2, the lower ends of the upper bottom and the lower bottom are provided with interlocking openings (4-1), and then the interlocking openings (4-1) are opened. 1) The fiber-reinforced composite material foam sandwich corrugated board (4) is cut into a plurality of grooved sandwich corrugated strips (5) of equal thickness; Step 4: Interlock and fix the plurality of sandwich corrugated strips with grooves (5) in Step 3, and finally obtain a pyramid-shaped lattice core material with composite foam sandwich beams. 3. a kind of preparation process with the pyramidal lattice core material of foam sandwich beam according to claim 2 is characterized in that: in step 2, on the corrugated foam corrugated plate (1), lay multi When the upper fiber prepreg (2) and the lower fiber prepreg (3) are layered, the fiber laying direction on the upper fiber prepreg (2) and the lower fiber prepreg (3) is corrugated in a corrugated foam The board (1) is laid symmetrically from the center to the outside, and the fiber laying angles of each layer of fiber prepreg are different. 4. according to claim 2 or 3 described a kind of preparation technology with the pyramid-shaped lattice core material of foam sandwich beam, it is characterized in that: in step 4, a plurality of band groove sandwich corrugated strips (5) The fixation between them is cemented with epoxy resin glue. 5. a kind of preparation technology that prepares the pyramid lattice core material that has foam sandwich beam, it is characterized in that: the concrete process of described preparation technology is as follows: Step 1: Lay multiple layers of upper fiber prepreg (2) on the flat foam board (6), lay multi-layer lower fiber prepreg (3) on the bottom of the flat foam board (6), and place the flat foam board (6) Put the multi-layer upper fiber prepreg (2) and the multi-layer lower fiber prepreg (3) under the hot press to pressurize to 0.4MPa-0.6MPa, and then keep warm at 120°C-130°C After 2 hours, it is solidified and formed, and finally, a fiber-reinforced composite foam sandwich panel (7) is obtained; Step 2: cutting the fiber-reinforced composite material foam sandwich panel (7) in step 1 into fiber-reinforced composite material foam sandwich corrugated strips (8) with interlocking openings (7-1); Step 3: interlocking and fixing the fiber reinforced composite foam sandwich corrugated strips (8) in step 2, finally obtaining a pyramid-shaped lattice core material with composite foam sandwich beams. 6. a kind of preparation technology that prepares the pyramid lattice core material that has foam sandwich beam according to claim 5, is characterized in that: in step 1, on flat foam board (6), lay multi-layer upper fiber When the prepreg (2) and the multi-layer lower fiber prepreg (3), the fiber laying direction on the upper fiber prepreg (2) and the lower fiber prepreg (3) is centered on the flat foam board (6) It is laid symmetrically outward, and the fiber laying angle of each layer of fiber prepreg is different. 7. according to claim 5 or 6 described a kind of preparation technology with the pyramidal lattice core material of foam sandwich beam, it is characterized in that: in step 3, a plurality of fiber-reinforced composite material foam sandwich corrugated strips (8) The fixation between them is cemented with epoxy resin glue.

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