Segmented hardness gradient shaped charge liner and design method thereof

Abstract

The invention discloses a segmented hardness gradient shaped charge liner and belongs to the technical field of weapon equipment.The gradient shaped charge liner comprises an inner layer, a middle layer and an outer layer which are sequentially arranged, the hardness range of the outer layer is 300 HV-400 HV, the hardness range of the middle layer is 600 HV-700 HV, and the hardness range of the inner layer is 850 HV-900 HV. The invention further discloses a design method of the segmented hardness gradient shaped charge liner. Comprising the steps of material selection, finite element simulation optimization, preparation forming and surface treatment. According to the gradient shaped charge liner and the design method thereof, by optimizing the distribution rule of hardness of the inner surface and the outer surface of the gradient shaped charge liner, the stability, the speed and the penetrating capacity of energy-gathered jet flow are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of weapon equipment, and in particular to a segmented hardness gradient liner and a design method thereof. Background Art

[0002] The liner is an important component of the shaped charge device. Its shape and material properties directly affect the molding quality and performance of the shaped charge jet. At present, traditional liner designs are mostly made of homogeneous materials, which will limit the improvement of jet performance in some scenarios. For example, in the penetration of high-strength armor or complex target materials, the jet shape of the traditional homogeneous liner is prone to fragmentation or instability, making it difficult to meet the requirements of efficient strikes.

[0003] To solve the above problems, designing gradient material liner becomes an effective optimization method. By realizing the gradual distribution of physical, chemical or mechanical properties in the liner material, the jet forming process can be optimized, the jet speed and stability can be increased, and the penetration performance can be further improved. However, there is still a lack of a mature and effective gradient liner design method.

[0004] As the core component of shaped charge technology, the material properties and geometric shape of the liner play a decisive role in the formation and performance of the shaped charge jet. Traditional liners are mostly made of homogeneous metal materials. Although these materials are easy to process, they are prone to breakage and instability during jet formation and penetration of high-strength protective targets, making it difficult to meet the needs of modern complex combat environments.

[0005] In recent years, hardness gradient materials have become a research hotspot due to their advantages in mechanical properties. By forming a hardness gradient between the inner and outer surfaces of the liner, the jet forming efficiency and impact resistance can be improved. However, the design method and manufacturing process for hardness gradient liners are still immature, which limits their wide application in the field of shaped charges. Summary of the invention

[0006] The purpose of the present invention is to provide a segmented hardness gradient liner and a design method thereof, which improves the stability, speed and penetration ability of the shaped charge jet by segmenting the hardness of the gradient liner and optimizing the distribution law of the hardness of the inner and outer surfaces of the gradient liner.

[0007] To achieve the above-mentioned purpose, the present invention provides a segmented hardness gradient medicine cover, comprising an inner layer, an intermediate layer and an outer layer arranged in sequence, the outer layer hardness range is 300HV-400HV, the intermediate layer hardness range is 600HV-700HV, and the inner layer hardness range is 850HV-900HV.

[0008] Preferably, the thickness of the outer layer accounts for 20%-25% of the total thickness of the cover body, the thickness of the middle layer accounts for 40%-50% of the total thickness of the cover body, and the thickness of the inner layer accounts for 25%-40% of the total thickness of the cover body.

[0009] Preferably, there is a smooth transition between the inner layer and the middle layer, and between the middle layer and the outer layer.

[0010] Preferably, the outer layer material is made of high-strength metal or alloy; the middle layer material is made of medium-hardness metal or composite material; and the inner layer material is made of high-hardness ceramic or metal-based composite material.

[0011] The present invention also provides a design method for a segmented hardness gradient liner, the steps comprising:

[0012] S1. According to the performance requirements of the gradient liner, determine the materials of each layer of the liner and their thickness ratio, and define the hardness range of each layer;

[0013] S2. Optimize the thickness and hardness distribution of each layer through finite element simulation to ensure the continuity of energy transfer;

[0014] S3, using additive manufacturing or hot pressing technology to process materials layer by layer and ensure gradient distribution;

[0015] S4. Heat treatment or surface treatment of finished products to enhance material properties.

[0016] Preferably, in step S2, the shape, velocity and energy transfer efficiency of the bubble jet are considered during finite element simulation.

[0017] Preferably, when processing the material layer by layer in step S3, composite material lamination or interface diffusion welding is used between the layers to ensure the stability and strength of the interlayer structure.

[0018] Therefore, the present invention adopts the above-mentioned segmented hardness gradient liner and its design method, which has the following beneficial effects:

[0019] (1) The present invention adopts a segmented design for the hardness gradient liner. By segmenting the hardness of the inner, middle and outer layers, the speed, length and stability of the shaped charge jet are effectively improved, while the rupture resistance and durability of the liner are enhanced.

[0020] (2) The present invention effectively improves the explosion resistance and overall life of the charge liner through hardness gradient design.

[0021] (3) The thickness and hardness of the inner, middle and outer layers of the segmented hardness gradient charge liner can be adjusted according to different mission requirements through precise calculations and experiments. It has high flexibility and can be customized for different target types and strike requirements to ensure the best penetration and damage effects.

[0022] (4) The design method of the present invention is applicable to medicine caps of different materials and shapes.

[0023] (5) The present invention has strong versatility and is suitable for a variety of application scenarios such as complex target penetration and deep hole blasting, and has broad promotion value.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a medicine liner according to an embodiment of the present invention;

[0026] Figure 2 is a flow chart of a method according to an embodiment of the present invention;

[0027] Reference numerals

[0028] 1. Inner layer; 2. Middle layer; 3. Outer layer. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Example

[0031] Reference Figure 1 The present invention provides a segmented hardness gradient drug liner having a multi-layer structure, including an inner layer 1, a middle layer 2 and an outer layer 3 arranged in sequence.

[0032] The outer layer 3 material is made of high-strength metal or alloy with high toughness, which is used to resist the initial impact of the explosion and protect the cover from external damage. Its hardness ranges from 300HV to 400HV, and its thickness accounts for 20% to 25% of the total thickness of the cover.

[0033] The middle layer material 2 is made of medium hardness metal or composite material, which is used to achieve transitional energy transfer and prevent structural damage caused by stress concentration. Its hardness ranges from 600HV to 700HV, and its thickness accounts for 40% to 50% of the total thickness of the cover body.

[0034] The inner layer 2 material is made of high-hardness ceramic or metal-based composite material to form a high-energy jet and improve penetration performance. Its hardness ranges from 850HV to 900HV, and its thickness accounts for 25% to 40% of the total thickness of the mask body.

[0035] The gradient shroud has smooth transitions between layers, rather than abrupt jumps. Specifically, it is connected through segmented heat treatment or additive manufacturing processes, and a hardness gradient is formed by controlling the heating and cooling rates to achieve a smooth transition of the hardness gradient. During the design process, the physical properties and functional requirements of each layer of material must be considered comprehensively to ensure that the outer layer 3 has sufficient toughness and impact resistance to withstand air resistance and environmental pressure during high-speed flight; the middle layer 2 achieves efficient energy transfer; and the inner layer 1 provides maximum penetration through high hardness design to optimize the target damage effect.

[0036] The gradient design of the gradient cover gradually increasing in hardness from the outer layer 3 to the inner layer 1 can ensure that each material layer works synergistically when penetrating the target, optimize energy utilization efficiency, and avoid premature dissipation of energy due to uneven stress.

[0037] Reference Figure 2 The present invention also provides a design method for a segmented hardness gradient liner, the steps comprising:

[0038] S1. According to the performance requirements of the gradient liner, determine the materials of each layer of the liner and their thickness ratio, and define the hardness range of each layer.

[0039] S2. Optimize the thickness and hardness distribution of each layer through finite element simulation to ensure the continuity of energy transfer. It should be noted that the shape, velocity and energy transfer efficiency of the bubble jet need to be considered during finite element simulation.

[0040] S3. Use segmented heat treatment technology to carburize or quench different areas to gradually form a hardness gradient from the outside to the inside, or use additive manufacturing technology to control the hardness by depositing materials layer by layer to achieve a gradient distribution.

[0041] Specifically, the outer layer is formed by precision casting or laser melting deposition, the middle layer is prepared by hot pressing, and the inner layer is prepared by injection molding or powder metallurgy. When processing the material layer by layer, composite material lamination or interface diffusion welding is used between the layers to ensure the stability and strength of the interlayer structure. The hood of the gradient liner is formed by precision die-casting or spinning technology to achieve the geometric forming of the hood.

[0042] S4. Heat treatment or surface treatment of finished products to enhance material properties.

[0043] The segmented hardness gradient charge liner designed in the present invention is widely applicable to anti-armor weapons, deep space exploration, anti-satellite and other fields. Its unique hardness gradient design enables it to exert the best effect in striking different target materials and target types.

[0044] In anti-armor applications, segmented hardness gradient liner can effectively fight against multi-layer composite armor and improve penetration capability. When fighting against advanced defense systems such as explosion-proof armor and ballistic missile shields, the optimized design of hardness gradient can ensure that the warhead can play a stable and efficient penetration effect in a large range.

[0045] In order to verify the effectiveness of the gradient drug liner and its design method of the present invention, an experiment is carried out as follows.

[0046] First, the gradient drug liner is prepared.

[0047] A high-toughness titanium alloy is used as the outer layer 3 material, an aluminum alloy is used as the middle layer 2 material, and a high-hardness ceramic-based composite material is used as the inner layer 1 material.

[0048] The segmented heat treatment technology is used to carburize or quench different areas, gradually forming a hardness gradient from the outside to the inside.

[0049] Using diffusion welding technology, each layer is firmly bonded to ensure structural integrity and performance stability.

[0050] The outer surface is coated with a corrosion-resistant coating to improve its environmental adaptability, and the inner surface is microstructurally optimized to enhance the stability of jet formation.

[0051] Then, the penetration performance of the prepared segmented hardness gradient liner was tested.

[0052] The target to be penetrated is a multi-layer armor structure, including steel plates, composite materials and explosion-proof materials. The thickness and hardness of each layer of armor are different, simulating various complex defense systems on the modern battlefield.

[0053] The test method compares the segmented hardness gradient liner with the traditional single hardness liner to test its effectiveness in penetrating multiple layers of defense. The liner is fired at the armored target through a high-speed ballistic test device to record the penetration depth, damage range and number of armor layers. A high-speed camera is used to track the test process to observe the dynamic changes of the liner during the penetration process, especially the response of the hardness gradient layer when penetrating materials of different hardness.

[0054] Experimental data show that the liner with segmented hardness gradient design has stronger adaptability and higher penetration effect when penetrating multi-layer armor. The hardness gradient enables the liner to exert strong hardness at the initial stage of contact with the target. After breaking through the outer layer of defense, the flexibility and toughness of the inner layer material can further enhance the penetration, thereby effectively breaking through thicker armor.

[0055] Compared with the traditional single hardness design liner, the penetration depth of the segmented hardness gradient liner is increased by 25%, and its breakdown efficiency is significantly improved.

[0056] Therefore, the present invention adopts the above-mentioned segmented hardness gradient charge liner and its design method, by segmenting the hardness of the gradient charge liner and optimizing the distribution law of the hardness of the inner and outer surfaces of the gradient charge liner, thereby improving the stability, speed and penetration ability of the shaped charge jet.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A segmented hardness gradient liner, characterized in that: It comprises an inner layer, a middle layer and an outer layer which are arranged in sequence, the outer layer has a hardness range of 300HV-400HV, the middle layer has a hardness range of 600HV-700HV, and the inner layer has a hardness range of 850HV-900HV.

2. The segmented hardness gradient liner according to claim 1, characterized in that: The thickness of the outer layer accounts for 20%-25% of the total thickness of the cover body, the thickness of the middle layer accounts for 40%-50% of the total thickness of the cover body, and the thickness of the inner layer accounts for 25%-40% of the total thickness of the cover body.

3. The segmented hardness gradient liner according to claim 1, characterized in that: There is a smooth transition between the inner layer and the middle layer, and between the middle layer and the outer layer.

4. The segmented hardness gradient liner according to claim 1, characterized in that: The outer layer material is made of high-strength metal or alloy; the middle layer material is made of medium-hardness metal or composite material; and the inner layer material is made of high-hardness ceramic or metal-based composite material.

5. A method for designing a segmented hardness gradient liner according to any one of claims 1 to 4, characterized in that the steps include: S1. According to the performance requirements of the gradient liner, determine the materials of each layer of the liner and their thickness ratio, and define the hardness range of each layer; S2. Optimize the thickness and hardness distribution of each layer through finite element simulation to ensure the continuity of energy transfer; S3, using additive manufacturing or hot pressing technology to process materials layer by layer and ensure gradient distribution; S4. Heat treatment or surface treatment of finished products to enhance material properties.

6. The design method of a segmented hardness gradient liner according to claim 5, characterized in that: In step S2, the shape, velocity and energy transfer efficiency of the bubble jet are considered during finite element simulation.

7. The design method of a segmented hardness gradient liner according to claim 5, characterized in that: When processing the material layer by layer in step S3, composite material lamination or interface diffusion welding is used between the layers to ensure the stability and strength of the interlayer structure.

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