Light super-strong composite board

Abstract

The invention belongs to the technical field of composite materials. The invention provides a light super-strong composite board which comprises a metal empty box, a plurality of round-corner square tubes are tightly arranged in the metal empty box according to an array, and the axial direction of the round-corner square tubes is perpendicular to the top face and the bottom face of the metal empty box. In the process that the front face is impacted or subjected to high pressure, the arrangement of the round-corner square tubes must be slightly deformed, so that huge repulsion and active resistance to external force are generated among non-displaceable atoms on the outer sides of the tubes, and a nonlinear mechanical response behavior that the larger the external force is, the stronger the resistance is is shown. The super-strong composite board has the characteristics of light weight and high strength.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of composite materials, and particularly relates to a light-weight super-strong composite plate. BACKGROUND

[0002] In recent years, with the increasing requirements of aerospace, military technology, protective engineering and high-end equipment manufacturing field on structural lightweight, high strength and impact resistance, composite structures of materials have been widely studied and applied. The existing sandwich structure and honeycomb composite plate usually use hollow geometric units or honeycomb structure to improve specific strength and specific stiffness, and has certain characteristics in terms of lightweight and static load bearing. However, under strong impact, explosion load or high pressure environment, the core layer is still prone to yield, crushing or interlayer peeling, resulting in overall instability and even structural damage, which is difficult to meet the protection requirements under extreme conditions.

[0003] Traditional metal materials slide atoms on crystal planes under external force, and high molecular and composite materials twist molecular chains to absorb external energy, but the structure is irreversibly damaged when exceeding the yield limit; atoms in ceramic materials are difficult to displace, and the material has high stiffness and hardness, but is easy to crack under high impact, and it is difficult to realize the coordinated protection of energy diffusion and dissipation. Therefore, the existing materials or composite structures generally belong to the "passive impact resistance" system.

[0004] When the ancient Huangjintiandou structure is subjected to external force, the components of calliandra callothyrsus will be embedded more closely through micro-scale displacement, and the repulsive force and interaction between the atoms of the forcedly close interface will increase with the increase of the load, forming the active resistance characteristic of "the greater the external force, the stronger the resistance". Practice shows that the overall impact strength of the ancient Huangjintiandou structure is several times higher than that of a single piece of calliandra callothyrsus. This structure idea provides an important inspiration for the design of modern high-protection composite structures. How to draw on the active and coordinated concept of Huangjintiandou to build a high-impact-resistant and high-pressure-resistant composite plate structure is a subject worthy of study. SUMMARY

[0005] To solve the problems in the background art, the application provides a light-weight super-strong composite plate which has the characteristics of lightweight and high strength.

[0006] To achieve the above-mentioned purpose, the application provides the following technical solutions. A light-weight super-strong composite plate comprises a metal hollow box, a plurality of round-corner square tubes are arranged in the metal hollow box in an array and closely, and the tube edges are closely tangent.

[0007] Further, the metal hollow box comprises an upper panel, a lower panel and a peripheral panel; the axial direction of the round-corner square tube is perpendicular to the upper panel and the lower panel.

[0008] Further, the base body of the round-corner square tube is silicon carbide, and the reinforcing body is carbon fiber cloth.

[0009] Further, the density of the rounded square tube exceeds 2.0 g / cm 3 .

[0010] Further, the rounded square tube is a part of a standard circle, which is determined by the diameter d of the standard circle; when the central angle of the rounded square tube is a = 90°, it means that the rounded square tube is a quarter of the standard circle; the side distance of the square tube is D, and the ratio of d / D is used to define the rounded square tube.

[0011] Further, the ratio of d / D of the rounded square tube is 0.4-1.0.

[0012] When d / D = 1, the round tubes are arranged in a hexagonal close-packed manner.

[0013] Further, it is used in the fields of bridge panels, high-rise buildings, tank armor, ship plates, military transportation, aerospace, and extreme environment protection.

[0014] Further, it is used in the fields of bridge panels, high-rise buildings, tank armor, ship plates, military transportation, aerospace, and extreme environment protection.

[0015] The super-strong composite plate is composed of a metal hollow box welded by an upper panel, a lower panel, and a surrounding plate, and an array of CMC rounded square tubes arranged inside and perpendicular to the upper panel and the lower panel and tangent to each other; the density of the CMC rounded square tube exceeds 2.0 g / cm 3 , has high hardness, high rigidity, excellent high-temperature resistance (up to 1400℃), and is not easy to break, and has a low cost, which provides a feasible basis for its large-scale engineering application. By arranging the CMC rounded square tubes along the tube axis perpendicular to the panel and tangent to each other, the interface compression effect can be significantly enhanced under external load, and stress transfer can be effectively realized, thereby significantly improving the impact resistance and pressure resistance of the composite plate.

[0016] It is worth noting that although a single CMC rounded square tube can be penetrated under the impact load of a sniper rifle bullet at a close distance, multiple rounded square tubes can form a stress dispersion network by close arrangement, effectively dispersing impact energy, and significantly improving the overall impact resistance and pressure resistance; the composite plate can still maintain overall stability under the impact of a shell or kinetic energy bullet or in a high-pressure environment, and has excellent energy absorption and anti-damage ability.

[0017] The composite structure based on the CMC round square tube and the principle of the matching of the yellow intestine breaks the limitation of the traditional protective material "passive anti-impact" and has high strength, high hardness, low cost and active protection characteristics. The manufacturing cost is greatly reduced, and the composite structure can be widely applied to bridge panels, high-rise buildings, tank armor, ship plates, military traffic, aerospace and extreme environment protection fields, and is especially suitable for structural parts that require high strength, impact resistance and pressure resistance. The composite structure provides a new solution for structural design under extreme conditions.

[0018] The application has the following beneficial effects: 1. The application significantly improves the impact resistance and pressure resistance: by introducing the CMC round square tube array, the composite plate can form a multidirectional stress system under the action of impact and high pressure on the front surface, significantly improving the carrying capacity and stability of the overall structure, having stronger anti-external damage capacity, and being suitable for high-strength and extreme environment applications.

[0019] 2. The application has excellent mechanical properties and high temperature resistance: the composite plate uses high density and high strength CMC composite material, has excellent pressure resistance, high temperature resistance and impact resistance, delays crack propagation, enhances toughness, and still maintains stable performance under high temperature and high strength environment.

[0020] 3. The application is suitable for various application requirements: the CMC composite plate can be widely applied to bridge, aerospace, military armor and other fields, and has light weight and high strength characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a CMC round square tube structure diagram when d / D=0.4-1.0 of the application; wherein, the arc is part of a standard circle, the diameter of the standard circle is d, and the corresponding included angle a=90°; the opposite side distance of the square tube is D; the round square tube is defined by the d / D ratio: d / D=0.4-1.0; Figure 2 It is a CMC round square tube physical diagram when d / D=1 of the application; Figure 3 It is a CMC round square tube high impact and high pressure mechanism diagram when d / D=1 of the application. DETAILED DESCRIPTION

[0022] The application will be further described in detail below in combination with examples.

[0023] The raw materials of the examples and comparative examples of the application are ordinary commercially available, except for special instructions.

[0024] The super strong composite board comprises an upper panel, a lower panel, a peripheral panel and an intermediate support layer between the upper panel and the lower panel. The intermediate support layer is composed of a plurality of CMC round square tubes. The CMC round square tubes are arranged in a regular and orderly array structure in a manner of being closely arranged and tangent to the panel along the tube axis perpendicular to the panel. The upper panel, the lower panel and the peripheral panel are sealed and firmly connected through a seam welding process, so that the intermediate support layer is stably positioned and the whole high-pressure-resistant and high-impact-resistant composite board is formed.

[0025] The super strong composite board adopts CMC round square tubes made of carbon fiber reinforced silicon carbide matrix (Cf / SiC) as the main support unit, wherein the round arc of the round square tube is a part of a standard circle and is determined by the diameter d of the standard circle.

[0026] As shown in Figure 1 , when the central angle of the round arc is a=90°, it represents that the round arc is a quarter of the standard round arc. Assuming that the opposite side distance of the square tube is D, the d / D ratio is used to define the round square tube; when d / D=1, the round square tube is a standard circle, and when d / D=0, the round square tube is a standard square. The present application adopts d / D=0.4-1.0. The opposite side distance of these round square tubes is 50-500 mm, and the wall thickness is not less than 15% of the opposite side distance of the square tube, so as to ensure that the effective multi-path force transmission network can be formed when the square tube is under stress. The upper panel, the lower panel and the peripheral panel are made of metal materials, and the thickness ranges from 1 mm to 5 mm. The thickness of the intermediate support layer is 100-700 mm, so as to realize the light weight and high strength of the whole composite board.

[0027] As shown in Figure 3 , by closely arranging the CMC round square tubes along the tube axis perpendicular to the panel and tangent to the panel, the interface compression effect can be significantly enhanced and stress transmission can be effectively realized under external load, so as to significantly improve the impact resistance and pressure resistance of the composite board.

[0028] Embodiment 1: The upper panel, the lower panel and the peripheral panel of the super strong composite board are all made of aluminum alloy plates with a thickness of 5 mm. The intermediate support layer is composed of an array of round square tubes with D=8 cm, d / D=1, wall thickness of 0.5 cm and length of 10 cm (as shown in Figure 2 ).

[0029] Experimental verification shows that the mass of the super strong composite board with a volume of 81 cm*41 cm*11 cm is reduced by 77% compared with the aluminum alloy with a density of 2.7 g / cm 3 , and the pressure resistance is increased by 1.57 times.

[0030] In the embodiment 2, the upper panel, the lower panel and the four surrounding panels of the super-strong composite panel are made of steel plates with a thickness of 5 mm, and the intermediate support layer is composed of a square tube array with a D of 8 cm, a d / D of 1, a wall thickness of 0.5 cm and a length of 10 cm.

[0031] The experimental verification shows that the composite panel with a volume of 81 cm*41 cm*11 cm has a mass reduction of 85% and a pressure resistance strength of 1.31 times higher than that of a steel plate with a density of 7.85 g / cm 3 .

[0032] In the embodiment 3, the upper panel, the lower panel and the four surrounding panels of the super-strong composite panel are made of aluminum alloy plates with a thickness of 5 mm, and the intermediate support layer is composed of a square tube array with a D of 8 cm, a d / D of 0.6, a wall thickness of 0.5 cm and a length of 10 cm.

[0033] The experimental verification shows that the composite panel with a volume of 81 cm*41 cm*11 cm has a mass reduction of 69% and a pressure resistance strength of 1.65 times higher than that of an aluminum alloy with a density of 2.7 g / cm 3 .

[0034] In the embodiment 4, the upper panel, the lower panel and the four surrounding panels of the super-strong composite panel are made of steel plates with a thickness of 5 mm, and the intermediate support layer is composed of a square tube array with a D of 8 cm, a d / D of 0.6, a wall thickness of 0.5 cm and a length of 10 cm.

[0035] The experimental verification shows that the composite panel with a volume of 81 cm*41 cm*11 cm has a mass reduction of 83% and a pressure resistance strength of 1.38 times higher than that of a steel plate with a density of 7.85 g / cm 3 .

[0036] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present application will not describe various possible combinations again.

[0037] In addition, various different embodiments of the present application can be combined in any appropriate manner without departing from the spirit of the present application, and should be considered as disclosed in the present application.

Claims

1. A lightweight superstrong composite panel, characterized by, The metal hollow box comprises upper and lower panels and four peripheral edge plates; the axis of the rounded square tube is perpendicular to the upper and lower panels, and the tube edge is tangent to the panels.

2. The lightweight super strong composite sheet according to claim 1, characterized by, The metal hollow box comprises upper and lower panels and four peripheral edge plates; the axis of the rounded square tube is perpendicular to the upper and lower panels, and the tube edge is tangent to the panels.

3. The lightweight super strong composite sheet according to claim 1, characterized in that, The base of the rounded square tube is silicon carbide, and the reinforcing body is carbon fiber cloth.

4. The lightweight super strong composite sheet according to claim 3, characterized in that, The density of the rounded square tube exceeds 2.0 g / cm 3 .

5. The lightweight super strong composite sheet according to claim 1 or 3 or 4, characterized in that, The rounded square tube has a circular arc which is a part of a standard circle, and is determined by the diameter d of the standard circle; when the central angle of the circular arc is a=90°, it means that the circular arc is a quarter of the standard circle; the opposite side distance of the square tube is D, and the d / D ratio is used to define the rounded square tube.

6. The lightweight super strong composite sheet according to claim 5, characterized by, The d / D ratio of the rounded square tube is 0.4-1.

0.

7. The lightweight super strong composite sheet according to claim 5, characterized by, When d / D=1, the square tube is arranged in a hexagonal close-packed manner.

8. The lightweight super strong composite sheet according to claim 1, wherein It is used in the fields of bridge panels, high-rise buildings, tank armor, ship plates, military transportation, aerospace and extreme environment protection, and all structural components with high strength, impact resistance and pressure resistance.

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