1. A manufacturing method of a high-energy-absorption honeycomb panel for a lightning-proof vehicle floor is characterized by comprising the following steps:

s1, shaping the honeycomb core: cleaning and airing the honeycomb core, and cutting the honeycomb core to obtain a honeycomb core with a specified specification size;

s2 skin forming processing

S21, layering [ carbon cloth/0 °/+45 °/-45 °/0 °/carbon cloth ], and marking the fiber direction of 0 °;

s22, placing the laid prepreg on a flat plate, coating a release agent on the flat plate, placing release cloth on the prepreg, then adding a pressure equalizing plate, manufacturing a vacuum bag, vacuumizing, placing in an oven for curing, and keeping vacuumizing all the time in the curing process;

s23, processing the external dimensions of the inner skin and the outer skin to reach the dimensions required by the drawing;

s3, integrally curing the skin and the honeycomb core

S31, laying an adhesive film J78B on the inner skin and the outer skin, then placing the honeycomb core between the inner skin and the outer skin, and fixing the periphery by using tooling;

s32, feeding the honeycomb core into an autoclave to finish skin forming on the surface of the honeycomb core under the vacuum-pumping condition;

s4, demolding: and carrying out nondestructive detection on the product, transferring to a post-treatment process when the product is qualified, and carrying out reworking treatment on the unqualified composite material rear cover to a qualified state.

2. The method for manufacturing the high energy absorption cellular board for the lightning protection vehicle floor according to claim 1, wherein [ carbon cloth/0 °/+45 °/-45 °/0 °/carbon cloth ] is processed by a ply process, wherein 0 °, +45 °, -45 ° represents a ply angle.

3. The method for manufacturing the high-energy-absorption honeycomb panel for the lightning-proof vehicle floor according to claim 1, wherein the prepreg is a semi-finished raw material of carbon fiber or glass fiber which is impregnated with resin.

4. The method for manufacturing the high energy absorption honeycomb panel for the lightning protection vehicle floor according to claim 1, wherein the mold release agent is a film-forming liquid resin, and an interface coating functional material between the mold and a product formed by the prepreg enables the surface of the product to be easily detached, smooth and clean.

5. The manufacturing method of the high energy absorption honeycomb panel for the lightning protection vehicle floor according to claim 1, wherein the honeycomb core is made of aluminum alloy.

Background

Mines, roadside bombs and simple explosive devices have become the biggest threats to armored vehicles, and although armored vehicles have lightning protection and bulletproof devices, huge explosive shock waves can cause serious casualties and huge economic losses, so that the design of an energy absorption device of an armored vehicle floor is particularly important. The honeycomb structure is a uniform regular hexagon geometric shape, can well disperse external force and support each other, is a perfect mechanical structure, has wide application as an energy absorption structure, absorbs energy through iterative deformation of the core cell walls, and plays roles of explosion prevention and impact resistance;

at present, an energy absorption device of a military armored vehicle at the present stage generally adopts an aluminum alloy energy absorption honeycomb structure, the strength of an impact platform of the aluminum alloy energy absorption honeycomb structure with the common specification is generally below 10MPa, and the requirement on impact resistance cannot be met.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a method for manufacturing a high-energy-absorption honeycomb panel for a lightning-proof vehicle floor.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a manufacturing method of a high-energy-absorption honeycomb panel for a lightning-proof vehicle floor comprises the following steps:

s1, shaping the honeycomb core: cleaning and airing the honeycomb core, and cutting the honeycomb core to obtain a honeycomb core with a specified specification size;

s2 skin forming processing

S21, layering [ carbon cloth/0 °/+45 °/-45 °/0 °/carbon cloth ], and marking the fiber direction of 0 °;

s22, placing the laid prepreg on a flat plate, coating a release agent on the flat plate, placing release cloth on the prepreg, then adding a pressure equalizing plate, manufacturing a vacuum bag, vacuumizing, placing in an oven for curing, and keeping vacuumizing all the time in the curing process;

s23, processing the external dimensions of the inner skin and the outer skin to reach the dimensions required by the drawing;

s3, integrally curing the skin and the honeycomb core

S31, laying an adhesive film J78B on the inner skin and the outer skin, then placing the honeycomb core between the inner skin and the outer skin, and fixing the periphery by using tooling;

s32, feeding the honeycomb core into an autoclave to finish skin forming on the surface of the honeycomb core under the vacuum-pumping condition;

s4, demolding: and carrying out nondestructive detection on the product, transferring to a post-treatment process when the product is qualified, and carrying out reworking treatment on the unqualified composite material rear cover to a qualified state.

Further, [ carbon cloth/0 °/+45 °/-45 °/0 °/carbon cloth ] was subjected to a ply processing, wherein 0 °, +45 °, -45 ° indicates a ply angle.

The prepreg is a semi-finished product raw material of carbon fiber or glass fiber which is completely impregnated with resin. The release agent is a liquid resin capable of forming a film, and an interface coating functional material between a mold and a product formed by prepreg enables the surface of the product to be easy to separate, smooth and clean.

Further, the honeycomb core is made of aluminum alloy.

The invention has the beneficial effects that: this patent is to lightning protection vehicle floor explosion buffering energy-absorbing inefficiency, and the higher not enough problem of bulk density changes traditional aluminum alloy mask into high strength carbon fiber mask, when realizing subtracting heavy, makes lightning protection vehicle floor's anti-detonation ability reach more than 70%.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is an exemplary illustration of a ply design of a product of the present invention.

Detailed Description

As shown in fig. 1 and fig. 2, a method for manufacturing a high energy absorption cellular board for a lightning protection vehicle floor includes the following steps:

s1, shaping the honeycomb core: cleaning and airing the honeycomb core, and cutting the honeycomb core to obtain a honeycomb core with a specified specification size;

s2 skin forming processing

S21, layering [ carbon cloth/0 °/+45 °/-45 °/0 °/carbon cloth ], and marking the fiber direction of 0 °;

s22, placing the laid prepreg on a flat plate, coating a release agent on the flat plate, placing release cloth on the prepreg, then adding a pressure equalizing plate, manufacturing a vacuum bag, vacuumizing, placing in an oven for curing, and keeping vacuumizing all the time in the curing process;

s23, processing the external dimensions of the inner skin and the outer skin to reach the dimensions required by the drawing;

s3, integrally curing the skin and the honeycomb core

S31, laying an adhesive film J78B on the inner skin and the outer skin, then placing the honeycomb core between the inner skin and the outer skin, and fixing the periphery by using tooling;

s32, feeding the honeycomb core into an autoclave to finish skin forming on the surface of the honeycomb core under the vacuum-pumping condition;

s4, demolding: and carrying out nondestructive detection on the product, transferring to a post-treatment process when the product is qualified, and carrying out reworking treatment on the unqualified composite material rear cover to a qualified state.

Wherein the honeycomb core is 5052 (or 3003) aluminum alloy durable honeycomb and regular hexagon, the specification of the core material is that the side length multiplied by the thickness is 1.32 multiplied by 0.08, the node strength of the honeycomb core is more than 1.47N/mm, and the density is 240 +/-10 Kg/m³。

The prepreg is a semi-finished product raw material of carbon fiber or glass fiber which is completely impregnated with resin.

The release agent is a liquid resin capable of forming a film, and an interface coating functional material between a mold and a product formed by prepreg enables the surface of the product to be easy to separate, smooth and clean.

The main technical problem who solves of this patent is as follows:

(1) study on gluing process of honeycomb core and carbon fiber board surface

The node bonding strength of the aluminum honeycomb core material and the impact resistance of the honeycomb plate are researched by optimizing a process approach, selecting node glue with a proper type and allocating the viscosity of the core strip glue to a proper range, so that the node strength of the honeycomb is improved, and the node strength of the honeycomb core is improved, so that the impact resistance of the honeycomb plate can be improved.

(2) Curing pressure and aging research of honeycomb core and carbon fiber plate surface

The influence of the curing pressure and the temperature control on the mechanical property of the high-energy-absorption honeycomb plate is researched, and the range of the forming curing pressure of the honeycomb plate is obtained by testing the mechanical properties (stretching, shearing and compression) of the carbon fiber skin honeycomb sandwich structure under different forming curing pressures, so that the compression property of the carbon fiber skin honeycomb sandwich structure is optimal, and the optimal energy-absorption effect is obtained.

(3) Optimization research of wall thickness and pore diameter structure of honeycomb core

The honeycomb core is a light core material in a hexagonal lattice shape, which is processed by aluminum foil through glue joint, and the performance optimization of low density and high strength is realized by adjusting the wall thickness and the pore diameter of the honeycomb core.

The light and high energy absorption purpose of the lightning protection vehicle floor is achieved through key technologies such as honeycomb core and carbon fiber board gluing process research, honeycomb core and carbon fiber board curing pressure and aging research, wall thickness and aperture structure optimization research of the honeycomb core and the like.

The high-energy-absorption honeycomb plate is a sandwich structure formed by gluing a surface layer and a high-density honeycomb core in the middle, and is mainly formed by compounding three materials, namely a surface layer (skin), a honeycomb core and a glue.

The main technical index requirements of the high energy absorption honeycomb panel are as follows:

(1) the density of the honeycomb plate body is 0.3-0.45g/cm³；

(2) The tensile strength is more than or equal to 50 MPa;

(3) the quasi-static compressive strength is more than or equal to 20 MPa;

(4) the absorbed energy is more than or equal to 13MJ/m during quasi-static compression³；

(5) The attenuation rate of the explosion shock wave is more than or equal to 70 percent;

(6) the maximum specification can reach 1800mm multiplied by Xmm (X is 20-40 mm).

The honeycomb core of the honeycomb plate is a light core material in a hexagonal lattice shape, which is processed by aluminum foil through glue joint, and the honeycomb core selected in the high-energy-absorbing honeycomb plate is a regular hexagonal and durable honeycomb made of 5052 or 3003 aluminum alloy. The honeycomb core density and deviation should meet the GJB1719 specification.

TABLE 1 specification and Properties of commonly used honeycomb cores

The panel of the honeycomb plate refers to a thin plate of an outer layer of a sandwich structure, a common panel is an aluminum panel (material LY12CZ), and for the high-energy-absorption honeycomb plate, a carbon fiber panel (formed by compounding carbon fibers or carbon cloth and resin) with better performance is selected.

The honeycomb plate mainly comprises an upper high-strength panel, a lower high-strength panel (a metal layer or a fiber layer and the like) and a honeycomb aluminum core body in the middle, wherein the panels generally have higher strength and rigidity, and the core body has larger deformability, so that a large amount of energy can be absorbed under the action of external load (such as impact or explosive load), and the structure is protected from being damaged.

Therefore, the carbon fiber skin/aluminum honeycomb integrated honeycomb plate is adopted, and the carbon fiber skin with higher strength and rigidity is adopted, so that the integrity of the honeycomb plate is greatly improved. In order to research the local compression performance and the energy absorption performance of the carbon fiber skin/honeycomb plate, a quasi-static local pressure test is carried out on the carbon fiber skin/aluminum honeycomb by optimizing factors such as the thickness of the skin, the layering mode of the skin, the matching of the thickness of the skin and the height of a honeycomb core, the damage process and the damage form of the carbon fiber skin/aluminum honeycomb plate are researched and analyzed by various factors, two typical load-displacement curves of the honeycomb plate under the quasi-static local pressure condition are summarized, and the influence of the change of parameters on the mechanical performance and the energy absorption effect of the honeycomb plate is quantitatively analyzed by data.

And preferably selecting a resin system, preparing the composite material by adopting different adhesive resin contents, and evaluating the energy absorption/structural performance of the composite material by taking the bending performance, the interlaminar shear performance and the compression performance as evaluation indexes. The composite material can keep enough high structural mechanical property in a static state under a proper resin system and reasonable resin content, more fibers fail in a stretching deformation mode instead of a shearing mode in an impact loading process, and the advantage of high fiber stretching energy consumption is played.

The tensile strength of the composite board is not less than 46MPa according to the technical index requirements, 3 groups of different skin thicknesses and layering angles are optimized for tensile test, and the test parameters are shown in table 2.

TABLE 2 skin lay-up sequence for different thicknesses

As shown in FIG. 2, the connotation of the one-ply, ply design

Determining the total number of layers of the layer: the total thickness h of the product is n1 h1+ n2h2+ n3h3, wherein n1, n2 and n3 are the number of layers of the corresponding materials, and h1, h2 and h3 are the single-layer thickness of the cured materials.

Determining the direction angle of the paving: the reasonable ply angle can optimize the mechanical property and other properties of local parts, and the current common standard ply angle is as follows: 0 °/+45 °/-45 °/90 ° can meet the design requirement, and also can be 0 °/-45 °/+45 °/0 °. (0 is a designated one direction).

Second, representation of the layer

The representation of prepreg unidirectional tape layup [ 45/-45/0/-45/45/90/90/45/-45/0/-45/45 ] (example 1) can be simplified to [ 45/-45/0/-45/45/90 ] s, where 0, 45, 90, -45 represent layup angles and s represents layup symmetry about the mid-plane.

The unidirectional tape ply [ 45/-45/0/-45/45/90/45/-45/0/-45/45 ] (example 2) can be reduced to [ 45/-45/0/-45/45/90 ], which shows that the ply is single-symmetrical about the median plane.

The adhesive is prepared from DY.E.44 epoxy resin adhesive and DY.EP curing agent. The epoxy resin is a high-molecular synthetic material with excellent properties, forms a body-shaped mesh structure after the curing of a reinforcing agent, and has good bonding capability, chemical corrosion resistance, heat resistance, higher mechanical strength and excellent electrical insulation performance. Meanwhile, the finished product has the characteristics of small shrinkage, low water absorption performance and the like. It can be widely used for the adhesion of various metals and non-metals, the manufacture of various corrosion-resistant coatings and electrical insulating materials, and the layer casting of various plates or pipes, the manufacture of casting precision moulds and the like. The curing agent is a toughening agent of epoxy resin, and has the advantages of high bonding strength, good toughness, no odor and no toxicity.

Breaks through the key technology of the integrated design technology of the carbon fiber skin/aluminum honeycomb sandwich structure, develops the light high-energy-absorption composite floor, achieves the density of a honeycomb plate body with the thickness of 40mm and the density of the honeycomb plate body less than 0.35g/cm through the energy absorption examination after the bulletproof lightning protection impact³The carbon fiber skin/aluminum honeycomb sandwich structure absorbs energy per unit volume not less than 12MJ/m in quasi-static compression³The index of (2) solves the survival rate of personnel and important equipment after the military armor is struck by lightning.

This patent is to lightning protection vehicle floor explosion buffering energy-absorbing inefficiency, and the higher not enough problem of bulk density changes traditional aluminum alloy mask into high strength carbon fiber mask, when realizing subtracting heavy, makes lightning protection vehicle floor's anti-detonation ability reach more than 70%.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.