Lightweight protection plate for launching vehicle

Abstract

The invention provides a lightweight protection plate for a launching vehicle. The lightweight protection plate solves the technical problem that the anti-knock performance of a vehicle body of an existing launching vehicle is not ideal. The protection plate is formed by compositing a first ultra-high molecular weight polyethylene plate, a middle sandwich structure and a second ultra-high molecular weight polyethylene plate which are sequentially arranged from front to back, the first ultra-high molecular weight polyethylene plate serves as a front face plate, and a polyurea coating is arranged on the front face of the first ultra-high molecular weight polyethylene plate. The second ultra-high molecular weight polyethylene plate serves as a back plate, a polyurea coating is arranged on the back face of the second ultra-high molecular weight polyethylene plate, the middle sandwich structure comprises polyurethane foam, a carbon fiber grid and a plurality of ultra-high molecular weight polyethylene embedded parts, the surface density of the protection plate is 23.2 kg / m < 2 >, and the protection plate can resist 80 kPa shock wave incident overpressure. The anti-explosion and anti-impact cable is reasonable in structural design and has good tensile fracture resistance, so that the anti-explosion and anti-impact capacity is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of explosion-proof and explosion-resistant protective plates, and in particular to a lightweight protective plate used for a launch vehicle to protect the vehicle body. Background Art

[0002] In modern warfare, with the rapid development of enemy advanced target reconnaissance and positioning technology, bomb explosion power and destructive effectiveness, and the obvious target characteristics and weak protection capabilities of traditional open land-based road mobile launch platforms, they are prone to damage and loss of combat effectiveness under enemy attack conditions. my country's existing launch vehicles are facing severe tests in terms of wartime protection, survival counterattack and actual combat capabilities.

[0003] The traditional launch vehicle body protection plate is composed of aluminum alloy panel and polyurethane foam aluminum alloy panel, and the surface density of the protection plate is 18kg / m 2 Under the overpressure of 80kPa shock wave, the maximum deflection of the structure is close to 80mm, which cannot meet the protection requirements required in modern warfare. The surface density of the existing 9mm explosion-proof steel plate is 70.2kg / m 2 , cannot meet the lightweight requirements. Summary of the invention

[0004] The purpose of the present invention is to propose a lightweight protective plate for a launch vehicle, to solve the technical problem that the existing launch vehicle body has unsatisfactory explosion-proof performance, to select the launch vehicle body material and explosion-proof material to form a new protective plate process design, and to provide a better solution for the explosion-proof reinforcement design and optimization of the launch vehicle body.

[0005] The technical solution to achieve the purpose of the present invention is: a lightweight protective plate for a launch vehicle, which is composed of a first ultra-high molecular weight polyethylene plate, an intermediate sandwich structure and a second ultra-high molecular weight polyethylene plate arranged in sequence from front to back, the first ultra-high molecular weight polyethylene plate is used as a front plate, a polyurea coating is provided on the front of the first ultra-high molecular weight polyethylene plate, the second ultra-high molecular weight polyethylene plate is used as a back plate, a polyurea coating is provided on the back of the second ultra-high molecular weight polyethylene plate, the intermediate sandwich structure includes polyurethane foam, carbon fiber grid, and a plurality of ultra-high molecular weight polyethylene embedded parts, and the surface density of the protective plate is 23.2kg / m 2 , can withstand 80kPa shock wave incident overpressure.

[0006] Compared with the prior art, the present invention has the following significant advantages:

[0007] (1) The explosion resistance is significantly enhanced: compared with the original cabin structure of 1.5mm aluminum alloy panel + 50mm polyurethane foam + 1.5mm aluminum alloy panel, under the overpressure of 80kPa shock wave incident, the maximum deflection of the structure is close to 80mm, which is much larger than the maximum deflection of the protective structure proposed in the present invention (15mm-16mm).

[0008] (2) Improved lightness: Compared with the existing 9mm explosion-proof steel plate, its surface density is 70.2kg / m 2 The surface density of the protective plate proposed by the present invention is 23.2kg / m 2 On the premise of meeting the explosion-proof protection requirements, the weight of the protective plate is greatly reduced, achieving lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the implementation cases of the present invention, the drawings required for the implementation cases are briefly introduced below.

[0010] Figure 1 It is a schematic diagram of the structure of the present invention.

[0011] Figure 2 It is a schematic diagram of the sandwich structure of the present invention.

[0012] Figure 3 It is the back plate center deflection curve.

[0013] Figure 4 It is the equivalent stress curve of polyurea on the front panel.

[0014] Figure 5 It is the equivalent stress curve of polyurea of ​​the back panel.

[0015] Figure 6 It is the equivalent stress curve of the front panel.

[0016] Figure 7 It is the equivalent stress curve of the back panel.

[0017] Figure 8 It is the deflection curve of the aluminum alloy protective plate structure. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only embodiments of a part of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Combination Figure 1A lightweight protective plate for a launch vehicle is composed of a first ultra-high molecular weight polyethylene plate 2, an intermediate sandwich structure, and a second ultra-high molecular weight polyethylene plate 6 arranged in sequence from front to back. The first ultra-high molecular weight polyethylene plate 2 is used as a front plate, and a polyurea coating 1 is provided on the front of the first ultra-high molecular weight polyethylene plate 2. The second ultra-high molecular weight polyethylene plate 6 is used as a back plate, and a polyurea coating 1 is provided on the back of the second ultra-high molecular weight polyethylene plate 6. The intermediate sandwich structure includes polyurethane foam 3, carbon fiber grid 5, and a plurality of ultra-high molecular weight polyethylene embedded parts 4. The surface density of the protective plate is 23.2 kg / m 2 The overall thickness is 56mm, and it can withstand 80kPa shock wave incident overpressure.

[0020] The thickness of the first ultra-high molecular weight polyethylene sheet 2 is 2 mm, the thickness of the second ultra-high molecular weight polyethylene sheet 6 is 6 mm, and the thickness of the polyurea coating 1 on both sides is 4 mm. The ultra-high molecular weight polyethylene sheet refers to an orthogonal layer polyethylene sheet with a molecular weight of about 2 million.

[0021] The thickness of the middle sandwich structure is 40 mm.

[0022] The carbon fiber grid 3 is divided into several cavities, and the polyurethane foam 3 and the ultra-high molecular weight polyethylene embedded parts 4 are filled in the cavities of the carbon fiber grid 5. The length of the projection surface of a single cavity is not more than 200 mm, and the width is not more than 200 mm.

[0023] The ultra-high molecular weight polyethylene embedded parts 4 are distributed at intervals around the outermost cavity of the carbon fiber grid 5 .

[0024] The shape of the ultra-high molecular weight polyethylene embedded part 4 is adapted to the cavity filled by it, and the ultra-high molecular weight polyethylene embedded part 4 refers to a polyethylene embedded part with a molecular weight of 2 million.

[0025] Embodiment 1:

[0026] Combination Figure 1 , Figure 2 This embodiment provides a lightweight protective plate for a launch vehicle, including a first ultra-high molecular weight polyethylene plate 2, an intermediate sandwich structure and a second ultra-high molecular weight polyethylene plate 6.

[0027] The front panel is composed of a polyurea coating 1 and a first ultra-high molecular weight polyethylene plate 2, the thicknesses of which are 4 mm and 2 mm respectively.

[0028] The middle sandwich structure includes polyurethane foam 3, carbon fiber grid 5 and several ultra-high molecular weight polyethylene embedded parts 4, with a thickness of 40 mm. Specifically, the carbon fiber grid 5 is divided into several cavities, the length of the projection surface of a single cavity is 200 mm, and the width is 200 mm. The ultra-high molecular weight polyethylene embedded parts 4 are distributed around the outer ring cavity of the carbon fiber grid 5, and the polyurethane foam 3 and the ultra-high molecular weight polyethylene embedded parts 4 are filled in the cavity of the carbon fiber grid 5.

[0029] The back panel is composed of a second ultra-high molecular weight polyethylene plate 6 and a polyurea coating 1, and the thicknesses of the two are 6 mm and 4 mm respectively.

[0030] Finally, a "sandwich" protective plate structure of "4mm polyurea coating 1 + 2mm first ultra-high molecular weight polyethylene plate 2 + 40mm middle sandwich structure + 6mm second ultra-high molecular weight polyethylene plate 6 + 4mm polyurea coating 1" with a total thickness of 56mm is formed.

[0031] The present invention sprays polyurea coating on the structure, adopts grid filling form to form a "sandwich" structure, and adopts ultra-high molecular weight polyethylene plate with lower density than steel plate and aluminum alloy panel. Under 80kpa shock wave incident overpressure, the maximum deflection of the protective structure proposed by the present invention is close to 80mm compared with the original structure, and the maximum deflection is 15-16mm, and the anti-explosion protection ability is significantly enhanced; at the same time, the surface density is 70.2kg / m 2 9mm steel plate, the surface density of this protective plate is 23.2kg / m 2 On the premise of meeting the explosion-proof protection requirements, the weight of the protective plate is greatly reduced, achieving lightweight.

[0032] In modern warfare, with the rapid development of enemy target detection and positioning technology and bomb damage efficiency, my country's launch vehicle wartime protection, survival and counterattack capabilities are facing severe tests. Aiming at the close-range explosion shock wave attack that the launch vehicle may encounter, the present invention improves the launch vehicle body protection plate by combining new materials with new structures, which is conducive to the launch vehicle to better adapt to the development trend of modern warfare, meet the multi-functional protection needs in complex battlefield environments, and maximize the wartime survival and protection capabilities of the launch vehicle; at the same time, it also reduces the body weight and manufacturing costs to a certain extent.

[0033] The mechanical properties of the prepared lightweight protective plate for the launch vehicle were tested:

[0034] The lightweight protective plate for the launch vehicle prepared in Example 1 of the present application was subjected to a mechanical property test to obtain the polyurea equivalent stress curve of the front and back panels and the equivalent stress curve of the front and back panels. Figure 4 and Figure 5 By comparison, it can be seen that polyurea has a more obvious peak elimination effect on the front side, and its buffering effect is more obvious than that on the back side. Figure 6 and Figure 7 It can be found that the equivalent stress of the back panel is significantly reduced compared to the front panel, but it serves as the main pressure-bearing structure for a longer period of time. Analysis of the above results shows that the lightweight protective plate polyurea coating structure for the launch vehicle prepared in Example 1 of the present application has excellent mechanical properties, can restrain the deformation of the structure, effectively resist the impact load of the explosion, and significantly improve the explosion resistance of the protective plate.

[0035] The performance test of the prepared lightweight protective plate for the launch vehicle was carried out:

[0036] The lightweight protective plate for the launch vehicle prepared in Example 1 of the present application and the traditional protective plate were tested under 80 kPa shock wave incident overpressure, and their explosion-proof performance was compared using the deformation of the two as an index.

[0037] Depend on Figure 3 and Figure 8 It can be seen that under the action of the explosion load, the maximum deflection of the traditional protective plate and the lightweight protective plate for the launch vehicle prepared in Example 1 is very different. Among them, the maximum deflection of the center of the traditional protective plate reaches 80mm, while the maximum deflection of the center of the lightweight protective plate for the launch vehicle prepared in Example 1 of the present application is 15-16mm. Compared with the traditional protective plate, the maximum deformation is reduced by 81.25-82.5%. This fully illustrates that compared with the traditional protective plate in the prior art, the lightweight protective plate for the launch vehicle described in this application has more excellent explosion resistance, can more effectively resist the explosion shock wave, and protect the structure, and has important practical application value. In summary, the explosion-resistant and impact-resistant composite explosion-proof plate described in this application has a good energy consumption effect and greatly improves the explosion resistance and impact resistance.

[0038] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lightweight protective plate for a launch vehicle, Features: The protective plate is composed of a first ultra-high molecular weight polyethylene plate (2), an intermediate sandwich structure, and a second ultra-high molecular weight polyethylene plate (6) arranged in sequence from front to back. The first ultra-high molecular weight polyethylene plate (2) serves as a front plate, and a polyurea coating (1) is provided on the front of the first ultra-high molecular weight polyethylene plate (2). The second ultra-high molecular weight polyethylene plate (6) serves as a back plate, and a polyurea coating (1) is provided on the back of the second ultra-high molecular weight polyethylene plate (6). The intermediate sandwich structure includes polyurethane foam (3), a carbon fiber grid (5), and a plurality of ultra-high molecular weight polyethylene embedded parts (4). The surface density of the protective plate is 23.2 kg / m 2 The maximum deflection of the center of the protective plate is 15mm~16mm, which can withstand 80kPa shock wave incident overpressure.

2. The lightweight protective plate for a launch vehicle according to claim 1, Features: The thickness of the first ultra-high molecular weight polyethylene plate (2) is 2 mm, the thickness of the second ultra-high molecular weight polyethylene plate (6) is 6 mm, and the thickness of the polyurea coatings (1) on both sides is 4 mm.

3. The lightweight protective plate for a launch vehicle according to claim 1, Features: The thickness of the middle sandwich structure is 40 mm.

4. The lightweight protective plate for a launch vehicle according to claim 3, Features: The carbon fiber grid (3) is divided into a plurality of cavities. The polyurethane foam (3) and the ultra-high molecular weight polyethylene embedded parts (4) are filled in the cavities of the carbon fiber grid (5). The length of the projection surface of a single cavity is not greater than 200 mm, and the width is not greater than 200 mm.

5. The lightweight protective plate for a launch vehicle according to claim 4, Features: The ultra-high molecular weight polyethylene embedded parts (4) are distributed at intervals around the outermost cavity of the carbon fiber grid (5).

6. The lightweight protective plate for a launch vehicle according to claim 5, Features: The shape of the ultra-high molecular weight polyethylene embedded part (4) is adapted to the cavity it fills.

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