A bulletproof sheet based on non-Newtonian fluid and preparation method thereof

Abstract

The present invention relates to a bulletproof sheet based on non-Newtonian fluid and a preparation method thereof. The bulletproof sheet based on non-Newtonian fluid comprises a non-Newtonian fluid capsule, a honeycomb structure, an interlayer plate, and a fixing bolt; the non-Newtonian fluid capsule is filled with a non-Newtonian fluid; the non-Newtonian fluid capsule is placed in a honeycomb of the honeycomb structure; the honeycomb structure has at least one layer, and each layer of the honeycomb structure is placed between two layers of the interlayer plates; the honeycomb structure and the interlayer plates are fixedly connected by the fixing bolt. The present invention can improve the performance of bulletproof vests, reduce the weight of bulletproof vests, meet the bulletproof requirements for various large-caliber bullets, reduce the impact force of bullets on the human body, and can also be used in military tanks, aircraft, vehicles and other parts that require bulletproof after being enlarged in size.

Description

Technical Field

[0001] The present invention belongs to the application field of protective equipment for military and police individuals and military tanks, aircraft, vehicles and the like, and specifically relates to a bulletproof sheet based on a non-Newtonian fluid and a preparation method thereof. Background Art

[0002] Bulletproof vests are a type of clothing that can absorb and dissipate the kinetic energy of bullets and explosion fragments, prevent them from penetrating, and effectively protect the human body. Early bulletproof vests were mainly made of metal, and then developed into a combination of aluminum alloy and high-strength nylon materials. In recent years, with the advancement of technology and the emergence of new materials, modern bulletproof vests have better performance. They are mainly divided into three types: hard, soft and composite, such as soft bulletproof vests made of high-performance fibers; hard bulletproof vests made of hard metals and non-metals such as super-strong aluminum alloys, alumina, silicon carbide; and composite bulletproof vests made of the above two types of materials.

[0003] Non-Newtonian fluid is a kind of material that has been studied very hotly in recent years. It refers to a fluid that does not satisfy Newton's experimental law of viscosity, that is, a fluid whose shear stress and shear strain rate are not in a linear relationship. It has a special property. When you hit the surface of a non-Newtonian fluid solution hard, it will become hard, that is, it has the characteristic of getting stronger when it encounters strong forces. This feature is very suitable for making bulletproof vests. When a bullet hits the surface of a bulletproof vest at a very fast speed, due to the characteristics of non-Newtonian fluids, it will become very strong, directly resisting the speed of the bullet and absorbing its energy. Summary of the invention

[0004] In order to improve the performance of bulletproof vests, reduce the weight of bulletproof vests, meet the bulletproof requirements for various large-caliber bullets, and reduce the impact force of bullets on the human body, the present invention provides a bulletproof sheet based on non-Newtonian fluid and a preparation method thereof.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A bulletproof sheet based on non-Newtonian fluid comprises a non-Newtonian fluid capsule, a honeycomb structure, an interlayer plate, and a fixing bolt; the non-Newtonian fluid capsule is filled with a non-Newtonian fluid; the non-Newtonian fluid capsule is placed in a honeycomb of the honeycomb structure; the honeycomb structure has at least one layer, and each layer of the honeycomb structure is placed between two layers of the interlayer plates; the honeycomb structure and the interlayer plates are fixedly connected by the fixing bolt.

[0007] Furthermore, the honeycomb structure is made of light metal or plastic and the fixing bolts are made of light metal or resin to fix the interlayer plates.

[0008] Furthermore, the bulletproof sheet is composed of multiple layers of honeycomb structures containing non-Newtonian fluid capsules and interlayer plates, and the fixed connection between the layers is achieved through cross-connected fixing bolts.

[0009] Furthermore, the thickness of each layer of the bulletproof sheet is less than 5 mm; the bulletproof sheet can be made into a desired shape by cutting or other methods.

[0010] Furthermore, the non-Newtonian fluid may be starch solution, egg white, apple pulp, concentrated solution and suspension of high molecular polymer, etc.

[0011] Furthermore, the thickness of the non-Newtonian fluid capsule (the thickness of the entire capsule) is less than 5 mm, and the diameter can be selected within the range of 5 to 50 mm.

[0012] Furthermore, the envelope of the non-Newtonian fluid capsule may be made of flexible packaging materials such as plastic.

[0013] Furthermore, the honeycomb structure has a thickness of less than 5 mm and a wall thickness of generally less than 2 mm, and has a certain strength.

[0014] Furthermore, the material of the interlayer plate is light metal, hard ceramic sheet, etc.

[0015] Furthermore, the interlayer plate has an average thickness of less than 3 mm, and has trapezoidal or conical protrusions on its upper and lower surfaces. The function of these protrusions is to disperse the impact force of a non-Newtonian fluid capsule to multiple non-Newtonian fluid capsules in the next layer, thereby dispersing the vibration energy.

[0016] Furthermore, the fixing bolt has a length less than 8 mm and a diameter within the range of 3 to 8 mm, or replaces the non-Newtonian fluid capsule in some honeycombs (non-Newtonian fluid capsule is not provided where the fixing bolt is provided), and plays a role of fixing and supporting.

[0017] A method for preparing the above-mentioned bulletproof sheet based on non-Newtonian fluid comprises the following steps:

[0018] Filling a capsule with a non-Newtonian fluid and sealing the capsule to form a non-Newtonian fluid capsule;

[0019] preparing a honeycomb structure;

[0020] Placing an interlayer plate at the bottom layer, aligning the honeycomb structure and the interlayer plate, placing a non-Newtonian fluid capsule in the honeycomb structure, and placing another interlayer plate on the honeycomb structure, and repeating this process to prepare a multilayer composite material;

[0021] In the process of preparing the composite material of the multi-layer structure, fixing bolts are used to fix two to three layers, and a tight connection between all the layers is achieved by crossing each other.

[0022] Furthermore, a honeycomb structure is prepared by laser cutting of organic glass plates, or by wire cutting of duralumin; and an interlayer plate is prepared by machining of duralumin or carbon fiber plates.

[0023] The present invention adopts light metal or plastic or carbon fiber plate to make honeycomb structure, each honeycomb is loaded with capsule elements composed of non-Newtonian fluid, so as to form a layer of bulletproof sheet, each layer is connected by hard metal or ceramic plate with trapezoid or conical shape, and the trapezoid or conical part goes deep into the honeycomb to achieve the purpose of transmitting impact force to non-Newtonian fluid capsule. Through the distribution and arrangement of trapezoid or conical structure on the hard plate, the impact force received by a non-Newtonian fluid capsule can be dispersed to multiple non-Newtonian fluid capsules of the next layer, so as to achieve the dispersion of vibration energy. In the process of transmitting this impact energy, the shock wave speed will quickly decrease to below the threshold value of non-Newtonian fluid hardening. Thereafter, the impact energy will oscillate inside the Newtonian fluid capsule, and this oscillation between layers will offset each other, so as to achieve the bulletproof effect.

[0024] The bulletproof sheet of the present invention can also be used in military tanks, airplanes, vehicles and other parts that need bulletproof after being enlarged in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a bulletproof sheet based on non-Newtonian fluid.

[0026] Figure 2 It is a schematic diagram of the structure of a primitive of a bulletproof sheet based on non-Newtonian fluid.

[0027] Figure 3 Schematic diagram of a honeycomb structure containing non-Newtonian fluid capsules.

[0028] Figure 4 It is a schematic diagram of the interlayer plate structure. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described below by taking starch liquid as an example through specific embodiments and drawings.

[0030] This embodiment is a bulletproof sheet structure based on starch liquid non-Newtonian fluid. Figure 1As shown, it includes a non-Newtonian fluid capsule, a honeycomb structure, an interlayer plate, and a fixing bolt. The non-Newtonian fluid capsule is filled with a non-Newtonian fluid, and the non-Newtonian fluid capsule is placed in the honeycomb of the honeycomb structure. The honeycomb structure has multiple layers, each layer of the honeycomb structure is placed between two layers of interlayer plates, and the honeycomb structure and the interlayer plate are fixedly connected by fixing bolts. Figure 2 It is a schematic diagram of the structure of a primitive of a bulletproof sheet based on non-Newtonian fluid. Figure 3 Schematic diagram of a honeycomb structure containing non-Newtonian fluid capsules.

[0031] The non-Newtonian fluid is prepared by mixing starch and water in a ratio of 44:72. Then it is poured into a capsule with a diameter of 10 mm and a thickness of 3 mm and sealed. A 4 mm thick organic glass plate is prepared into a honeycomb structure by laser cutting, or hard aluminum can be used to prepare it by wire cutting. Figure 4 The interlayer plate shown in the figure has an overall thickness of 2 mm for hard aluminum and a height of about 0.5 mm for the raised part. Each raised structure corresponds to Figure 3 A hexagon is formed in the middle. The interlayer plate is placed at the bottom layer, the honeycomb structure and the interlayer plate are aligned with each other, and the injected capsules are placed in the honeycomb respectively, and then a layer of interlayer plate is placed on top, and this process is repeated to prepare a composite material with a five-layer structure. In this process, fixing bolts can be randomly distributed on the bulletproof sheet to fix two to three layers, and all layers can be tightly connected by crossing each other. The fixing bolts can be fixed in the form of rivets, threads, welding or bonding. The thickness of the prepared bulletproof sheet is about 30mm.

[0032] When a bullet hits a non-Newtonian fluid capsule in the first layer, its speed is much higher than the threshold of the non-Newtonian fluid hardening, so the non-Newtonian fluid capsule will rebound the bullet and transfer the energy to the interlayer plate below. Due to the staggered setting of the upper and lower protrusions of the interlayer plate, the impact energy will be dispersed to more than 3 non-Newtonian fluid capsules in the lower layer, realizing energy dispersion. By analogy, by the fifth layer, no more than 1 / 20 of the energy will be on each non-Newtonian fluid capsule. Considering the vibration absorption effect of the interlayer plate as a hard material, and the transmission loss of the shock wave between the hard material and the fluid material, its energy can be fully consumed by more than 99%.

[0033] It should be noted that the specific parameters in this embodiment, such as the ratio of starch to water, the size values ​​of each part, etc., are only examples and are preferred parameters. Other parameter values ​​may also be used in other embodiments.

[0034] In other embodiments, the non-Newtonian fluid may be egg white, apple pulp, concentrated solution and suspension of high molecular polymer, etc.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. A person skilled in the art may modify or make equivalent substitutions for the technical solutions of the present invention without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A bulletproof sheet based on non-Newtonian fluid, characterized in that: It includes a non-Newtonian fluid capsule, a honeycomb structure, an interlayer plate, and a fixing bolt; the non-Newtonian fluid capsule is filled with a non-Newtonian fluid; the non-Newtonian fluid capsule is placed in the honeycomb of the honeycomb structure; the honeycomb structure has at least one layer, and each layer of the honeycomb structure is placed between two layers of the interlayer plates; the honeycomb structure and the interlayer plates are fixedly connected by the fixing bolts; the upper and lower surfaces of the interlayer plates are distributed with trapezoidal or conical protrusion structures, the trapezoidal or conical protrusion structures penetrate deep into the honeycomb to transfer the impact force to the non-Newtonian fluid capsule; through the distribution and arrangement of the trapezoidal or conical protrusion structures on the interlayer plates, the impact force received by a non-Newtonian fluid capsule is dispersed to multiple non-Newtonian fluid capsules in the next layer, thereby achieving the dispersion of vibration energy, after which the impact energy oscillates inside the Newtonian fluid capsule, and the oscillations between layers will offset each other, thereby achieving a bulletproof effect.

2. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: It comprises multiple layers of the honeycomb structure and multiple layers of the interlayer plates, and the layers are fixedly connected by cross-connected fixing bolts.

3. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: The non-Newtonian fluid is one of the following: starch solution, egg white, apple pulp, concentrated solution or suspension of high molecular polymer.

4. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: The envelope of the non-Newtonian fluid capsule is a flexible packaging material, and the flexible packaging material includes plastic; the thickness of the non-Newtonian fluid capsule is less than 5 mm, and the diameter is 5 to 50 mm.

5. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: The honeycomb structure is made of light metal, plastic, or carbon fiber plate; the honeycomb structure has a thickness of less than 5 mm and a wall thickness of less than 2 mm.

6. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: The fixing bolt is made of light metal or resin; the length of the fixing bolt is less than 8 mm and the diameter is 3 to 8 mm.

7. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: The material of the interlayer plate is light metal or hard ceramic sheet.

8. The bulletproof sheet based on non-Newtonian fluid according to claim 1, characterized in that: The average thickness of the interlayer plate is less than 3 mm.

9. A method for preparing a bulletproof sheet based on a non-Newtonian fluid according to claim 1, characterized in that: The following steps are involved: Filling a capsule with a non-Newtonian fluid and sealing the capsule to form a non-Newtonian fluid capsule; preparing a honeycomb structure; Placing an interlayer plate at the bottom layer, aligning the honeycomb structure and the interlayer plate, placing a non-Newtonian fluid capsule in the honeycomb structure, and placing another interlayer plate on the honeycomb structure, and repeating the process to prepare a multilayer composite material; In the process of preparing the composite material of the multi-layer structure, fixing bolts are used to fix two to three layers, and a tight connection between all the layers is achieved by crossing each other.

10. The method according to claim 9, characterized in that The honeycomb structure is prepared by laser cutting of organic glass plates, or by wire cutting of hard aluminum plates; the interlayer plates are prepared by machining of hard aluminum plates or carbon fiber plates.

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