Composite metal laminate with high impact resistance

Abstract

The utility model relates to the technical field of metal composite laminates, in particular to a composite metal laminate with high impact resistance, which comprises two aluminum alloy plate layers, polypropylene fiber reinforced layers are arranged between the two aluminum alloy plate layers, two polypropylene fiber reinforced layers are arranged between the two aluminum alloy plate layers, and the polypropylene fiber reinforced layers are arranged between the two aluminum alloy plate layers. Two natural rubber layers are arranged between the two polypropylene fiber reinforced layers, a thermoplastic polyurethane layer is arranged between the two natural rubber layers, and an ethylene-vinyl acetate copolymer adhesive layer is arranged between the aluminum alloy plate layer and the polypropylene fiber reinforced layers. An ethylene-acrylic acid copolymer adhesive layer is arranged between the natural rubber layer and the polypropylene fiber reinforced layer. According to the metal composite laminate, the composite metal laminate with high impact resistance is obtained on the premise that few metal layers are used and the machining difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of metal composite laminate technology, and in particular to a composite metal laminate with strong impact resistance. Background Technology

[0002] With the advancement of research into high-strength materials, composite metal laminate structures have come into focus. Composite metal laminates offer advantages such as high specific strength and stiffness, superior fatigue and impact resistance, high designability, good damping performance, and environmental friendliness and energy saving. They are widely used in the manufacture of aircraft components such as wings and fuselages, as well as automobile chassis, battery shells for new energy vehicles, and skin structures for high-speed trains.

[0003] In the design of metal composite laminates, the 3 / 2 structure (i.e., 3 metal layers + 2 fiber layers) and the 4 / 3 structure (i.e., 4 metal layers + 3 fiber layers) are common design structures. Although such designs can improve the impact resistance of the entire composite laminate, the addition of multiple metal layers will inevitably increase the overall weight of the material. Moreover, multiple metal layers also increase the risk of cracking of the ultra-thin metal layers during processing, and increase the difficulty of processing.

[0004] Therefore, in response to the problems mentioned in the background art, those skilled in the art propose a practical composite plate with fewer metal layers, relatively low processing difficulty, and strong impact resistance. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a composite metal laminate with strong impact resistance.

[0006] A composite metal laminate with high impact resistance includes two aluminum alloy layers. A polypropylene fiber reinforcement layer is disposed between the two aluminum alloy layers. Two polypropylene fiber reinforcement layers are also disposed. Two natural rubber layers are disposed between the two polypropylene fiber reinforcement layers. A thermoplastic polyurethane layer is disposed between the two natural rubber layers. An ethylene-vinyl acetate copolymer adhesive layer is disposed between the aluminum alloy layers and the polypropylene fiber reinforcement layers. An ethylene-acrylic acid copolymer adhesive layer is disposed between the natural rubber layers and the polypropylene fiber reinforcement layers.

[0007] Furthermore, the aluminum alloy plate is an anodized aluminum alloy plate.

[0008] Furthermore, the thickness of the aluminum alloy plate layer is 0.8 mm, the thickness of the polypropylene fiber reinforcement layer is 0.4 mm, the thickness of the thermoplastic polyurethane layer is 0.2 mm, the thickness of the natural rubber layer is 0.1 mm, the thickness of the ethylene-vinyl acetate copolymer adhesive layer is 0.02 mm, and the thickness of the ethylene-acrylic acid copolymer adhesive layer is 0.02 mm.

[0009] Furthermore, the polypropylene fiber reinforcement layer is twill-woven.

[0010] The advantages and beneficial effects of this utility model are as follows:

[0011] This application uses an aluminum alloy plate layer, an ethylene-vinyl acetate copolymer adhesive layer, a polypropylene fiber reinforcement layer, an ethylene-acrylic acid copolymer adhesive layer, a thermoplastic polyurethane layer, and a natural rubber layer to form the entire composite layer. Its composition is applicable to only two aluminum alloy plate layers. The density of the remaining materials is lower than that of the aluminum alloy plate layers, which effectively reduces the overall weight of the material. At the same time, the composite layer is formed by hot pressing, which reduces the risk of cracking of the ultra-thin metal plate layers during processing compared to composite layers using multiple metal plates, while ensuring the overall impact resistance of the material. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the composite laminate structure in Example 1;

[0015] Figure 3 This is a schematic diagram of the composite laminate in Example 2.

[0016] In the diagram: 1. Aluminum alloy plate layer; 2. Polypropylene fiber reinforcement layer; 3. Natural rubber layer; 4. Thermoplastic polyurethane layer; 5. Ethylene-vinyl acetate copolymer adhesive layer; 6. Ethylene-acrylic acid copolymer adhesive layer. Detailed Implementation

[0017] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0018] like Figure 1-3 As shown, this utility model provides:

[0019] A composite metal laminate with high impact resistance includes two aluminum alloy layers 1, two polypropylene fiber reinforcement layers 2, two natural rubber layers 3, and one thermoplastic polyurethane layer 4.

[0020] Two polypropylene fiber reinforcement layers 2 are respectively disposed on the inner side of two aluminum alloy plate layers 1. The aluminum alloy plate layer 1 is anodized aluminum alloy plate layer. Specifically, the aluminum alloy plate layer 1 in this application is 5083-O aluminum alloy. The thickness of the aluminum alloy plate layer 1 is 0.8 mm. The polypropylene fiber reinforcement layer 2 is prepared by twill weaving. The thickness of the polypropylene fiber reinforcement layer 2 is 0.4 mm. The polypropylene fiber reinforcement layer 2 and the aluminum alloy plate layer 1 are bonded together by an ethylene-vinyl acetate copolymer adhesive layer 5. The thickness of the ethylene-vinyl acetate copolymer adhesive layer 5 is 0.02 mm. The density of the polypropylene fiber reinforcement layer 2 and the ethylene-vinyl acetate copolymer adhesive layer 5 is lower than that of the aluminum alloy plate layer 1, thereby effectively reducing the overall weight of the composite layer.

[0021] The aluminum alloy plate layer 1 used in this application can effectively increase its surface roughness through anodizing treatment. Combined with the twill-woven polypropylene fiber reinforcement layer 2, the ethylene-vinyl acetate copolymer adhesive layer 5 can smoothly bond the two together.

[0022] In this application, two natural rubber layers 3 are disposed between two polypropylene fiber reinforcement layers 2, and the natural rubber layers 3 and the polypropylene fiber reinforcement layers 2 are bonded together by an ethylene-acrylic acid copolymer adhesive layer 6, the thickness of which is 0.02 mm.

[0023] In this application, a thermoplastic polyurethane layer 4 is provided between two natural rubber layers 3. The thickness of the natural rubber layer 3 used in this application is 0.1 mm, and the thickness of the thermoplastic polyurethane layer 4 is 0.2 mm. The thermoplastic polyurethane layer 3 and the natural rubber layer 3 are thermally bonded together. Specifically, the surfaces of the thermoplastic polyurethane layer 4 and the natural rubber layer 3 are first cleaned, and an adhesive is applied to the surfaces of the thermoplastic polyurethane layer 4 and the natural rubber layer 3. The adhesive can be Chemlock 218. The temperature is raised to 90°C and a pressure of 0.6 MPa is applied to fix and bond the thermoplastic polyurethane layer 4 and the natural rubber layer 3 together.

[0024] In this application, natural rubber layer 3 and thermoplastic polyurethane layer 4 are used as the middle part of the entire layer structure. The density of natural rubber layer 3 and thermoplastic polyurethane layer 4 is lower than that of aluminum alloy plate layer 1, which also reduces the overall weight of the material. At the same time, they have high strength and wear resistance, and improve the impact resistance of the layer structure.

[0025] When the composite laminate structure prepared in this application is laminated together, the thermoplastic polyurethane layer 4 and the natural rubber layer 3 are first thermally bonded together using the aforementioned method. Then, the aluminum alloy plate layer 1, the ethylene-vinyl acetate copolymer adhesive layer 5, the polypropylene fiber reinforcement layer 2, the ethylene-acrylic acid copolymer adhesive layer 6, the thermoplastic polyurethane layer 4, and the natural rubber layer 3 are sequentially overlapped, and a pressure of 0.4 MPa is applied for hot pressing at 100°C to obtain the metal composite laminate of this application.

[0026] Comparative Examples 1 and 2 were set up. Comparative Example 1 consisted of 3 metal layers and 2 fiber layers, composed of 3 aluminum alloy plate layers 1 and 2 polypropylene fiber reinforcement layers 2. Comparative Example 2 consisted of 4 metal layers and 3 fiber layers, composed of 4 aluminum alloy plate layers 1 and 3 polypropylene fiber reinforcement layers 2. The aluminum alloy plate layers 1 and polypropylene fiber reinforcement layers 2 in Comparative Examples 1 and 2 were spaced apart and bonded together by an ethylene-vinyl acetate copolymer adhesive layer 5. The structural diagrams of the metal composite laminates of Comparative Examples 1 and 2 are shown below. Figure 2 and Figure 3 As shown, the thicknesses of the aluminum alloy plate layer 1, polypropylene fiber reinforcement layer 2, and ethylene-vinyl acetate copolymer adhesive layer 5 used in Comparative Examples 1 and 2 are the same as those used in this embodiment. The density of Comparative Example 1 is 2.20 g / cm³. 3 The density of Comparative Example 2 is 2.14 g / cm³. 3 The density of the laminate prepared in this application is 1.88 g / cm³. 3 Impact resistance tests were conducted on the metal composite laminate of this embodiment and the composite laminates of Comparative Example 1 and Comparative Example 2. The initial velocity and residual velocity during the tests are shown in Table 1 below:

[0027] Table 1: Initial and Remaining Velocities of this Example, Comparative Example 1, and Comparative Example 2

[0028]

[0029] Based on the initial velocity and remaining velocity, the specific energy dissipation rate of the metal composite plates in this embodiment, Comparative Example 1, and Comparative Example 2 is calculated using the following formula: Where ρ is density, and its specific energy dissipation rate is shown in Table 2 below:

[0030] Table 2: Specific energy dissipation rate of this embodiment, Comparative Example 1, and Comparative Example 2

[0031]

[0032]

[0033] As can be seen from the specific energy dissipation rate data in Table 2 above, when subjected to the same impact force, the specific energy dissipation rate of the metal composite plate in this embodiment is higher than that of Comparative Example 1 and close to that of Comparative Example 2. The metal composite plate in this embodiment can also ensure good impact resistance with fewer metal layers, while the material density and weight are reduced.

[0034] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A composite metal laminate with high impact resistance, characterized in that, The device includes two aluminum alloy plates, with a polypropylene fiber reinforcement layer disposed in the middle of the two aluminum alloy plates. Two polypropylene fiber reinforcement layers are also disposed. Two natural rubber layers are disposed between the two polypropylene fiber reinforcement layers. A thermoplastic polyurethane layer is disposed between the two natural rubber layers. An ethylene-vinyl acetate copolymer adhesive layer is disposed between the aluminum alloy plates and the polypropylene fiber reinforcement layers. An ethylene-acrylic acid copolymer adhesive layer is disposed between the natural rubber layers and the polypropylene fiber reinforcement layers.

2. The impact-resistant composite metal laminate according to claim 1, characterized in that, The aluminum alloy plate is an anodized aluminum alloy plate.

3. The impact-resistant composite metal laminate according to claim 1, characterized in that, The thickness of the aluminum alloy plate layer is 0.8 mm, the thickness of the polypropylene fiber reinforcement layer is 0.4 mm, the thickness of the thermoplastic polyurethane layer is 0.2 mm, the thickness of the natural rubber layer is 0.1 mm, the thickness of the ethylene-vinyl acetate copolymer adhesive layer is 0.02 mm, and the thickness of the ethylene-acrylic acid copolymer adhesive layer is 0.02 mm.

4. The impact-resistant composite metal laminate according to claim 1, characterized in that, The polypropylene fiber reinforcement layer is twill woven.

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