CN114103303B - Fiber metal laminate for enhancing composite interface connection and preparation method thereof - Google Patents

Fiber metal laminate for enhancing composite interface connection and preparation method thereof Download PDF

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Publication number
CN114103303B
CN114103303B CN202111540088.2A CN202111540088A CN114103303B CN 114103303 B CN114103303 B CN 114103303B CN 202111540088 A CN202111540088 A CN 202111540088A CN 114103303 B CN114103303 B CN 114103303B
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fiber
metal laminate
plate
metal
prepreg tape
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CN114103303A (en
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王健
胥亮
王皑冬
严晓强
李泽澳
李秀东
乔天齐
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Dragon Totem Technology Hefei Co ltd
Hefei Jiuzhou Longteng Scientific And Technological Achievement Transformation Co ltd
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Yanshan University
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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
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • 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
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B3/263—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 a layer having non-uniform thickness
    • 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
    • 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
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • 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
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/162—Cleaning
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/16—Drying; Softening; Cleaning
    • B32B38/164—Drying
    • 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
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • 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
    • 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
    • B32B2037/1253—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives curable adhesive
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0076—Curing, vulcanising, cross-linking
    • 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
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/02—Composition of the impregnated, bonded or embedded layer
    • B32B2260/021—Fibrous or filamentary layer
    • 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
    • B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
    • B32B2260/04—Impregnation, embedding, or binder material
    • B32B2260/046—Synthetic resin
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/02—Synthetic macromolecular fibres
    • B32B2262/0261—Polyamide fibres
    • B32B2262/0269—Aromatic polyamide fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • 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
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/106—Carbon fibres, e.g. graphite fibres

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a fiber metal laminate for enhancing composite interface connection and a preparation method thereof, wherein the fiber metal laminate comprises a metal laminate and a fiber prepreg tape layer; the metal matrix surface microstructure comprises micron-sized bidirectional ripples similar to human small intestine villus structures and gecko foot seta structures and nanometer-sized corrosion holes connected with the ripples. The structure can improve the defects of the traditional physical surface treatment mode of the metal matrix of the fiber metal laminate, enhance the connection performance of the composite interface between the metal laminate and the fiber prepreg tape, and solve the layering and degumming problems easily occurring in the preparation and forming processes of the fiber metal laminate. The invention uses the human small intestine villus structure and the gecko foot upper seta structure for reference, utilizes the micron-sized bulges to realize large-area molecular contact when contacting any surface, and converts weak van der Waals interaction into huge adhesive force, thereby improving the composite interface connection performance between the metal laminate and the fiber resin layer and effectively improving the adhesive failure or the layering defect.

Description

Fiber metal laminate for enhancing composite interface connection and preparation method thereof
Technical Field
The invention relates to the technical field of plate composite materials, in particular to a fiber metal laminate for enhancing composite interface connection and a preparation method thereof.
Background
Compared with a single metal material and a traditional fiber composite material, the fiber metal laminate has the advantages of light weight, good electrical conductivity, higher specific strength and specific rigidity, excellent fatigue and impact resistance, high damage tolerance and the like. Due to the excellent comprehensive performance, the fiber metal laminate is an advanced composite material favored in the aerospace industry, and the application of the fiber metal laminate in the aerospace field reduces the weight of an aircraft structure and prolongs the fatigue life. Fiber metal laminates have become one of the important materials of choice for large aircraft fuselage and wing skin structures. In addition, as the demands of industries such as automobiles and rail transportation for the material damage tolerance capability and the degree of weight reduction are increasing, the demands for fiber metal laminate materials are also increasing.
The splitting or delamination between the metal laminate and the fiber resin layer is a form of defect that often occurs during the FMLs preparation and formation process. The reason is that the difference between the mechanical properties of the metal laminate and the fiber resin layer is large, so that the shear stress of the interface between the metal laminate and the fiber resin layer is increased in the preparation and forming processes, and the glue failure or delamination between layers occurs. Although the conventional physical surface treatment methods of the fiber metal laminate metal plate, such as sand paper grinding, wire brush grinding and sand blasting, form irregular saw-tooth-shaped micro-gullies on the surface of the metal laminate, increase the contact area between the metal laminate and the fiber resin layer, and improve the bonding strength, the defects of glue failure or delamination in the preparation and forming processes of the fiber metal laminate cannot be effectively improved. Therefore, the method can improve the composite interface connection performance between the metal layer plate and the fiber resin layer by designing and processing the microstructure on the surface of the metal layer plate, effectively improve the defect of glue failure or delamination, and become one of the research directions for FMLs at home and abroad.
Disclosure of Invention
In view of the above problems, the present invention provides a fiber metal laminate for enhancing composite interface connection and a method for manufacturing the same, wherein a micro-scale protrusion is used to realize large-area molecular contact when contacting any surface by using a villus structure of a human small intestine and a setae structure on a gecko foot, and weak van der waals interaction is converted into a huge adhesive force, so that the composite interface connection performance between the metal laminate and a fiber resin layer is improved, and the adhesive failure or delamination defect is effectively improved.
The technical scheme adopted by the invention is as follows:
the invention provides a fiber metal laminate for enhancing composite interface connection, which comprises a metal laminate and a fiber prepreg tape layer; the metal laminates are respectively arranged on the upper side and the lower side of the fiber prepreg tape layer; the surface of one side of the metal laminate connected with the fiber prepreg tape is provided with a micron-scale bidirectional ripple bionic structure, and the surface of the bidirectional ripple is provided with a nano-scale corrosion hole; the micron-scale bidirectional corrugation and the nano-scale corrosion holes jointly form a microstructure on the surface of the metal layer plate.
Furthermore, the micron-sized bidirectional ripple bionic structure is set in a sine function or cosine function mode, and is similar to a villus structure of human small intestines and a seta structure on gecko feet.
Furthermore, the wave crests and the wave troughs of the micron-sized bidirectional corrugations are uniformly and regularly arranged in a dot matrix on the surface of the metal laminate.
Furthermore, the sizes and densities of the wave crests and the wave troughs of the micron-sized bidirectional corrugations are determined by the connection performance of the composite interface of the metal laminate and the fiber prepreg tape, and are adjusted by changing the amplitude and the frequency of a sine function or a cosine function.
Furthermore, the metal layer plate is made of high-strength steel, stainless steel, aluminum alloy, magnesium alloy or titanium alloy.
Further, the fiber prepreg tape is made of aramid fibers or glass fibers or carbon fibers or graphite fibers or boron-containing fibers or whiskers.
Further, the fiber metal laminate comprises a structural design and a ply design; according to the bearing requirement, the laminated plate with the n/(n-1) structure can be manufactured according to the number of metal layers/fiber layers, wherein n is more than or equal to 2; the ply design can be made according to the fiber direction of each layer of fiber prepreg tape, and the fiber direction is 0 degrees or +/-45 degrees or 90 degrees.
A method for preparing a fiber metal laminate for reinforcing composite interfacial connections, comprising the steps of:
s1, preparing a metal laminate: cutting a rectangular or square plate by using a numerical control wire cut electrical discharge machine, and cleaning the surface of the plate;
s2, preliminary decontamination: cleaning the surface of the plate by using alcohol disinfectant, primarily removing pollutants and impurities on the surface of the plate, cleaning the surface of the plate by using clear water after the alcohol treatment is finished, finally drying the surface of the plate by using a heating oven, and drying for 12 minutes at 60 ℃;
s3, bidirectional corrugation rolling: placing the plate processed in the step S2 into an ultra-precision corrugated roller for bidirectional rolling; the corrugation of the corrugated roller is sine wave or cosine wave; setting the rolling direction of the first pass of corrugation to be parallel to one side of the plate, and rotating the plate by 90 degrees after rolling is finished to perform second pass of rolling; after rolling is finished, a certain amount of metal particles are remained on the surface of the plate, the surface of the metal plate is wiped by using acetone, then is wiped by using absolute ethyl alcohol, and finally is cleaned by ultrasonic oscillation for 5min to thoroughly remove residual substances on the surface;
s4, alkali washing: putting the plate processed in the step S3 into an alkaline washing tank filled with 100g/L NaOH solution for alkaline washing for 5min; continuously cleaning the plate subjected to alkali cleaning for 5min by using ultrasonic waves, and finally drying in a drying oven for 10min;
s5, acid washing: putting the plate processed in the step S4 into an acid washing tank filled with HCl solution with the concentration of 100g/L for acid washing for 5min; continuously cleaning the pickled plate for 5min by using ultrasonic waves, and finally drying in a drying oven for 10min;
s6, anodic oxidation: carrying out anodic oxidation treatment on the plate treated in the step S5, wherein the used solution is 100g/L phosphoric acid solution, the voltage is 25V, the current is 0.5-0.8A, and the oxidation time is 20min; placing the plate subjected to the anodic oxidation treatment into a drying oven for drying treatment for 10min to obtain a metal laminate;
s7, preparing a fiber prepreg tape: cutting the fiber prepreg tape into a size consistent with that of the metal laminate sample; before the thermosetting fiber prepreg tape is used, the thermosetting fiber prepreg tape needs to be unfrozen and dried for 6 hours at room temperature; the thermoplastic fiber prepreg tape can be directly used;
s8, designing a laminate structure and a layer: according to the bearing requirement, the laminated plate with the n/(n-1) structure can be manufactured according to the number of metal layers/fiber layers, wherein n is more than or equal to 2; the laying design can be carried out according to the fiber direction of each layer of the fiber prepreg tape, and the fiber direction is 0 degree or +/-45 degrees or 90 degrees;
s9, hot-pressing and curing: hot-pressing and curing the fiber metal laminate of the thermosetting fiber prepreg tape in an autoclave at the pressure of 0.6MPa and the temperature of 135 ℃ for 90min; finally, cooling the fiber metal laminate to 40 ℃ along with the furnace, stopping pressurizing and taking out the fiber metal laminate; the fiber metal laminate of the thermoplastic fiber prepreg tape is obtained by a hot die stamping process, the pressure is 0.8MPa, and the temperature is 240 ℃ for curing for 30min; and (4) cooling to room temperature along with the furnace, unloading the pressure and removing the fiber metal laminate.
Compared with the prior art, the invention has the following beneficial effects:
the treatment of the surface of the metal matrix changes the defects of the traditional physical surface treatment mode of the metal matrix of the fiber metal laminate, for example, the surface of the metal matrix is irregular, large pits and bulges are easy to generate, stress concentration is easy to generate, bubbles, cracks and the like are easy to generate due to uneven heating when the metal matrix is combined with resin, and thus the connection performance of a composite interface between the metal laminate and the fiber resin layer is reduced. The surface of the metal matrix adopts a bidirectional corrugated microstructure with a certain regular shape and lattice distribution to enhance the connection performance of a composite interface between the metal laminate and the fiber resin layer.
The metal matrix surface microstructure of the laminate consists of a bionic human body small intestine villus structure, a bidirectional ripple in a micron sine function or cosine function form of a seta structure on gecko feet and a nano-scale corrosion hole connected with the ripple. According to the mechanical adhesion theory, when the surface of the metal substrate has certain roughness, the polymer glue solution is easy to permeate into the concave holes, and countless small glue hooks are generated on the surface after solidification to play a role in nailing and binding. Compared with the traditional physical surface treatment mode of the metal matrix of the fiber metal laminate, the structure has the advantages that the surface roughness of the metal matrix can be increased more remarkably through the bidirectional corrugations, the actual area of the resin and the metal matrix with physical action at the connecting interface is increased, the interface shear strength between the metal laminate and the fiber resin layer is also increased, and the connecting performance of a composite interface between the metal laminate and the fiber resin layer is enhanced.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is an exploded perspective view of the surface of the metal matrix of FIG. 1;
FIG. 3 is a schematic top view of the structure of FIG. 2;
fig. 4 is a schematic front view of the structure of fig. 2.
Wherein, the reference numbers: 1-upper metal layer plate; 2-fiber prepreg tape layers; 3-lower metal layer plate; 4-micron-sized bidirectional corrugated bionic structure; 41-X direction corrugation; 42-Y direction corrugation; 5-nanometer corrosion holes.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured in a specific orientation, and be operated.
Referring to fig. 1 to 4, a specific structure of an embodiment of a fiber metal laminate for reinforcing composite interface connections according to the present invention is shown. The fiber metal laminate comprises a metal laminate and a fiber prepreg tape layer 2; the fiber metal laminate comprises a structural design and a layering design, and can be manufactured into a laminate with an n/(n-1) structure according to the number of metal layers/fiber layers according to the bearing requirement, wherein n is more than or equal to 2, in the embodiment, the number of the metal laminate n is 2, and the metal laminate n is an upper metal laminate 1 and a lower metal laminate 3 respectively; the ply design can be made according to the fiber direction of each layer of the fiber prepreg tape 2, and the fiber direction is 0 degrees or +/-45 degrees or 90 degrees.
The upper layer metal laminate 1 and the lower layer metal laminate 3 are respectively and correspondingly arranged on the upper side and the lower side of the fiber prepreg tape layer 2; the surfaces of one sides of the upper-layer metal laminate 1 and the lower-layer metal laminate 3, which are connected with the fiber prepreg tape layer 2, are provided with micron-sized bidirectional corrugated bionic structures 4, and the micron-sized bidirectional corrugated bionic structures 4 are composed of X-direction corrugations 41 and Y-direction corrugations 42; and the surfaces of the micron-sized bidirectional corrugated bionic structures 4 are provided with nano-sized corrosion holes 5; the micron-scale bidirectional ripple bionic structure 4 and the nano-scale corrosion holes 5 jointly form a microstructure on the surface of the metal layer plate. According to the theory of mechanical adhesion, when the surface of the metal matrix has certain roughness, the polymer glue solution is easy to permeate into the concave hole, and countless small glue hooks are generated on the surface after solidification to play a role of nailing and pricking. This structure plywood compares with traditional fibre metal laminate metal matrix physical surface treatment mode, and the roughness of increase metal matrix that can show more through two-way ripple, resin and metal matrix take place the actual area of physical action at interface of connection department and also increase, and the interface shear strength between metal plywood and the fibre resin layer also increases to compound interface connection performance between reinforcing metal plywood and the fibre resin layer.
The X-direction ripples 41 and the Y-direction ripples 42 of the micron-sized bidirectional ripple bionic structure 4 are both arranged in a sine function or cosine function mode, and are similar to a villus structure of a human small intestine and a seta structure on gecko feet; the wave crests and the wave troughs of the X-direction corrugations 41 and the Y-direction corrugations 42 are uniformly and regularly arranged in a lattice form on the surface of the metal laminate.
The sizes and densities of the wave crests and the wave troughs of the corrugations 41 in the X direction and the corrugations 42 in the Y direction have a certain range, are determined by the connection performance of the composite interfaces of the upper metal layer plate 1 and the lower metal layer plate 3 and the fiber prepreg tape 2, and can be adjusted by changing the amplitude and the frequency of a sine function or a cosine function.
The upper layer metal layer plate 1 and the lower layer metal layer plate 3 are made of high-strength steel, stainless steel, aluminum alloy, magnesium alloy or titanium alloy.
The fiber prepreg tape layer 2 comprises reinforcing fibers and a resin matrix, and the fiber material is aramid fibers or glass fibers or carbon fibers or graphite fibers or boron-containing fibers or whiskers; the resin material is thermosetting resin or thermoplastic resin.
A preparation method of a fiber metal laminate for reinforcing composite interface connection specifically comprises the following steps:
s1, preparing a metal laminate: the method is characterized in that a rectangular or square plate is cut by using a numerical control wire cut electrical discharge machine, and the surface of a cut metal layer plate is provided with a lot of oil stains and metal particles so as to ensure the bonding performance of an interface between two heterogeneous materials. The surface of the metal layer plate needs to be cleaned.
S2, preliminary decontamination: cleaning the surface of the metal laminate by using alcohol disinfectant, primarily removing pollutants and impurities on the surface of the metal laminate, cleaning the surface of the metal laminate by using clear water after the alcohol treatment is finished, finally drying the surface of the metal laminate by using a heating oven, and drying for 12 minutes at 60 ℃.
S3, bidirectional corrugation rolling: and (3) placing the metal laminate subjected to the previous treatment into an ultra-precise corrugated roller for bidirectional rolling. The corrugation of the corrugation roller is sine wave or cosine wave. And setting the rolling direction of the first-pass corrugation to be parallel to one edge of the metal laminate, and rotating the metal laminate by 90 degrees for second-pass rolling after the rolling is finished. After rolling is finished, a certain amount of metal particles are remained on the surface of the metal layer plate, the surface of the metal layer plate is wiped by using acetone, then is wiped by using absolute ethyl alcohol, and then is cleaned for 5min by using ultrasonic oscillation, so that residual substances on the surface are removed.
S4, alkali washing: and (3) putting the metal laminate subjected to the treatment into a NaOH solution with the concentration of 100g/L for alkali washing, wherein the alkali washing time is 5min, and the alkali washing tank is put into hot water to promote NaOH dissolution and chemical reaction rate. And (4) continuously cleaning the metal laminate subjected to alkali cleaning for 5min by using ultrasonic waves, and finally drying in a drying oven for 10min.
S5, acid washing: and (3) putting the metal plate subjected to the treatment into an HCl solution with the concentration of 100g/L for pickling, wherein the pickling time is 5min, and putting a pickling tank at the temperature of 20-50 ℃. And continuously cleaning the metal laminate subjected to acid cleaning for 5min by using ultrasonic waves, and finally drying in a drying oven for 10min.
S6, anodic oxidation: the solution used is 100g/L phosphoric acid solution, the voltage is 25V, the current is 0.5-0.8A, and the oxidation time is 20min. And (4) putting the metal laminate subjected to the anodic oxidation treatment into a drying box for drying treatment for 10min.
S7, preparing a fiber prepreg tape: the fiber prepreg tape is manually cut into the size same as that of a metal laminate sample, and the fiber prepreg tape needs to be kept clean during cutting, so that double-hand oil stain operation is avoided. The thermosetting fiber prepreg tape was thawed and dried at room temperature for 6 hours before use. The thermoplastic fiber prepreg tape can be used as it is.
S8, designing a layer plate structure and a layer laying: according to the bearing requirement, the laminated plate with the n/(n-1) structure can be manufactured according to the number of metal layers/fiber layers, wherein n is more than or equal to 2; the ply design can be carried out according to the fiber direction of each layer of fiber prepreg tape, and the fiber direction is 0 degree or +/-45 degrees or 90 degrees.
S9, hot-pressing and curing: the hot-pressing curing of the fiber metal laminate of the thermosetting fiber prepreg tape needs to be carried out in an autoclave at the pressure of 0.6MPa and the temperature of 135 ℃ for 90min. And finally, cooling to 40 ℃ along with the furnace, stopping pressurizing and taking out the fiber metal laminate. The fiber metal laminate of the thermoplastic fiber prepreg tape is obtained by a hot die stamping process, the pressure is 0.8MPa, and the temperature is 240 ℃ for curing for 30min. And (4) cooling to room temperature along with the furnace, unloading the pressure and removing the fiber metal laminate.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (3)

1. A preparation method of a fiber metal laminate for reinforcing composite interface connection is characterized by comprising the following steps: the laminate comprises a metal laminate and a fiber prepreg tape layer; the metal laminate is respectively arranged on the upper side and the lower side of the fiber prepreg tape layer; the surface of one side of the metal laminate connected with the fiber prepreg tape is provided with a micron-scale bidirectional ripple bionic structure, and the surface of the bidirectional ripple is provided with a nano-scale corrosion hole; the micron-scale bidirectional corrugation and the nano-scale corrosion holes jointly form a microstructure on the surface of the metal layer plate;
the micron-sized bidirectional ripple bionic structure is arranged in a sine function or cosine function mode and is similar to a villus structure of human small intestine or a seta structure on gecko feet;
the wave crests and the wave troughs of the micron-sized bidirectional corrugations are uniformly and regularly arranged in a dot matrix form on the surface of the metal laminate;
the sizes and densities of the wave crests and the wave troughs of the micron-sized bidirectional corrugations are determined by the connection performance of a composite interface of the metal laminate and the fiber prepreg tape, and are adjusted by changing the amplitude and the frequency of a sine function or a cosine function;
the fiber metal laminate comprises a structural design and a ply design; manufacturing a laminated board with an n/(n-1) structure according to the bearing requirement and the number of metal layers/fiber layers, wherein n is more than or equal to 2; carrying out ply design according to the fiber direction of each layer of fiber prepreg tape, wherein the fiber direction is 0 degree or +/-45 degrees or 90 degrees;
the preparation method of the fiber metal laminate comprises the following steps:
s1, preparing a metal laminate: cutting a rectangular or square plate by using a numerical control wire cut electrical discharge machine, and cleaning the surface of the plate;
s2, preliminary decontamination: cleaning the surface of the plate by using an alcohol disinfectant, primarily removing pollutants and impurities on the surface of the plate, cleaning the surface of the plate by using clear water after the alcohol treatment is finished, and finally drying the surface of the plate by using a heating oven at 60 ℃ for 12 minutes;
s3, bidirectional corrugation rolling: placing the plate processed in the step S2 into an ultra-precision corrugated roller for bidirectional rolling; the corrugation of the corrugated roller is sine wave or cosine wave; setting the rolling direction of the first pass of corrugation to be parallel to one side of the plate, and rotating the plate by 90 degrees after rolling is finished to perform second pass of rolling; after rolling is finished, a certain amount of metal particles can remain on the surface of the plate, the surface of the metal plate is wiped by using acetone, then is wiped by using absolute ethyl alcohol, and finally is cleaned by ultrasonic oscillation for 5min to thoroughly remove residual substances on the surface;
s4, alkali washing: putting the plate processed in the step S3 into an alkaline washing tank filled with 100g/L NaOH solution for alkaline washing for 5min; continuously cleaning the plate subjected to alkali cleaning for 5min by using ultrasonic waves, and finally drying in a drying oven for 10min;
s5, acid washing: putting the plate processed in the step S4 into an acid washing tank filled with HCl solution with the concentration of 100g/L for acid washing for 5min; continuously cleaning the pickled plate for 5min by using ultrasonic waves, and finally drying in a drying oven for 10min;
s6, anodic oxidation: carrying out anodic oxidation treatment on the plate processed by the S5, wherein the used solution is 100g/L phosphoric acid solution, the voltage is 25V, the current is 0.5-0.8A, and the oxidation time is 20min; placing the plate subjected to anodic oxidation treatment into a drying oven for drying treatment for 10min to obtain a metal laminate;
s7, preparing a fiber prepreg tape: cutting the fiber prepreg tape into a size consistent with that of the metal laminate sample; before the thermosetting fiber prepreg tape is used, the thermosetting fiber prepreg tape needs to be unfrozen and dried for 6 hours at room temperature; the thermoplastic fiber prepreg tape can be directly used;
s8, designing a laminate structure and a layer: manufacturing a laminated board with an n/(n-1) structure according to the bearing requirement and the number of metal layers/fiber layers, wherein n is more than or equal to 2; carrying out ply design according to the fiber direction of each layer of fiber prepreg tape, wherein the fiber direction is 0 degree or +/-45 degrees or 90 degrees;
s9, hot-pressing and curing: hot-pressing and curing the fiber metal laminate of the thermosetting fiber prepreg tape in an autoclave at the pressure of 0.6MPa and the temperature of 135 ℃ for 90min; finally, cooling the fiber metal laminate to 40 ℃ along with the furnace, stopping pressurizing and taking out the fiber metal laminate; the fiber metal laminate of the thermoplastic fiber prepreg tape is obtained by hot die stamping process, the pressure is 0.8MPa, and the temperature is 240 ℃ for curing for 30min; and (4) cooling to room temperature along with the furnace, unloading the pressure and removing the fiber metal laminate.
2. A composite interface connection reinforced fiber metal laminate according to claim 1, wherein: the metal layer plate is made of high-strength steel, stainless steel, aluminum alloy, magnesium alloy or titanium alloy.
3. A composite interface reinforced fiber metal laminate according to claim 1, wherein: the fiber prepreg tape is made of aramid fiber or glass fiber or carbon fiber or graphite fiber or boron-containing fiber or whisker.
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