High-strength and low-strength combined additive heterogeneous cavity anti-jet armored protection structure

Abstract

The invention discloses a high-strength and low-strength combined additive heterogeneous cavity anti-jet armor protection structure, and relates to the technical field of armor protection. The high-strength and low-strength combined additive heterogeneous cavity anti-jet armored protection structure comprises a base body, and the base body is provided with a plurality of heterogeneous cavity areas arranged in an array; each heterogeneous cavity area is composed of heterogeneous layers and cavity layers, and the heterogeneous layers and the cavity layers are alternately arranged and obliquely designed; the cavity layers in the adjacent heterogeneous cavity areas are in mirror symmetry; the heterogeneous layer comprises a plurality of high-strength steels and a plurality of low-strength steels, and the high-strength steels and the low-strength steels are alternately distributed along the wall surface of the cavity layer; an included angle alpha between the wall surface of the cavity layer and the vertical surface is 60-70 degrees, and an included angle beta between a heterogeneous interface between the high-strength steel and the low-strength steel in the heterogeneous layer and the vertical surface is 45-60 degrees; the armored protection structure is integrally formed through an electric arc additive manufacturing technology. Unification of light weight and high penetration resistance is achieved, and the method has important engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of armor protection technology, and in particular relates to an additive heterogeneous cavity anti-jet armor protection structure with a combination of high and low strength. Background Technology

[0002] The protective principles of shaped charge jets include interference, fracture, bending, energy dissipation through multiple cratering, and interference from reactive armor flyplate cutting. These principles involve absorbing energy while simultaneously interfering with the jet through plastic deformation of the protective structural materials or by generating fragments and crack propagation. Among existing armor structures, the most common are explosive reactive armor (ERA) that incorporates gaps, combines metals with non-metals (rubber, ceramics, etc.), or combines metals with energetic materials.

[0003] As shown in the invention patent CN116275053B, which discloses a conch shell-inspired aluminum-based composite armor and its forming method, this armor uses an alternating design of high-strength and high-toughness layers to induce crack deflection under impact loads, thereby improving energy absorption and impact resistance. However, regardless of whether a gradient design is introduced, its macroscopic structure is essentially still a layered form, relying mainly on the differences in the properties of the materials themselves to resist impacts. Furthermore, the verification environment for this structure is the Hopkinson bar impact test, and its effectiveness is mainly for low-speed impact scenarios; however, in actual applications, the armor may face the threat of ultra-high-speed shaped charge jets (with speeds reaching 8-10 km / s), therefore, it is urgent to optimize the armor structure design for such high-speed impact environments.

[0004] Chinese patent application CN107687791A discloses a shaped charge explosive reactive armor (ECMA) structure that can also protect against long-rod armor-piercing projectiles. This structure differs from the traditional "sandwich" flat plate configuration. Its innovation lies in using a flyer plate to form a shaped charge configuration, inducing projectile instability through the lateral interaction of the shaped charge jet with the armor-piercing projectile. However, this type of structure has significant limitations: firstly, the high energy released by the ECMA itself poses a serious safety hazard to the armor itself and the surrounding environment; secondly, if this structure is deployed as an external add-on armor, it will significantly increase the system size and weight; and embedding it inside the main armor is difficult to achieve because the high-speed jet formed by the shaped charge may cause collateral damage to adjacent components.

[0005] With the development of advanced forming technologies such as additive manufacturing (AM), it has become possible to integrate heterogeneous and heterogeneous materials. Against this backdrop, relatively simple laminated structure designs have failed to fully leverage the potential advantages of current forming technologies. As an advanced metal processing technology, additive manufacturing, with its unique advantages in manufacturing complex geometries and integrating multiple materials, has been applied in fields such as military, aerospace, and civil engineering.

[0006] Therefore, based on the synergistic design of material heterogeneity and structural heterogeneity achieved through additive manufacturing, this invention proposes a lightweight, high-protection structure with a heterogeneous cavity, aiming to significantly improve the armor's resistance to shaped charge jet penetration. This structure, through the synergistic effect of the strength heterogeneity design of the metal matrix material, the internal cavity configuration, and the interface tilt angle, aims to achieve the effect of interfering with the jet and dispersing energy dissipation. Summary of the Invention

[0007] The purpose of this invention is to provide an additive heterogeneous cavity anti-jet armor protection structure with a combination of high and low strength, in order to solve the problems mentioned in the background art, such as the inability to simultaneously achieve high protection and lightweight, and the unsuitability for high-speed / ultra-high-speed impact environments.

[0008] To achieve the above objectives, the present invention employs the following technical solution:

[0009] This invention proposes an additive heterogeneous cavity anti-jet armor protection structure with a combination of high and low strength. The armor protection structure includes a substrate with several arrayed heterogeneous cavity regions. Each heterogeneous cavity region is composed of a heterogeneous layer and a cavity layer, which are arranged alternately and at an angle. The cavity layers in adjacent heterogeneous cavity regions are mirror-symmetrical. The heterogeneous layer comprises a plurality of high-strength steel and a plurality of low-strength steel, wherein the volume ratio of the low-strength steel to the high-strength steel is 1 to 3, and the high-strength steel and the low-strength steel are alternately distributed along the cavity layer wall; the angle α between the cavity layer wall and the vertical plane is 60° to 70°, and the angle β between the heterogeneous interface between the high-strength steel and the low-strength steel in the heterogeneous layer and the vertical plane is 45° to 60°; the yield strength of the low-strength steel and the high-strength steel differs significantly, so that the matrix heterogeneous layer is composed of steel with alternating distribution of soft and hard materials.

[0010] The armor protection structure is integrally formed using arc additive manufacturing technology.

[0011] Preferably, the substrate is made of high-strength steel.

[0012] Preferably, the heterogeneous cavity region is rectangular, and several rectangular heterogeneous cavity regions are arranged in a grid, with a matrix portion of less than 5 mm between adjacent heterogeneous cavity regions on the left and right. The hollow cavity layers of adjacent heterogeneous cavity regions on the left and right are mirror-symmetrical along the vertical line between them, and the hollow cavity layers of adjacent heterogeneous cavity regions on the top and bottom are mirror-symmetrical along the horizontal line between them.

[0013] Preferably, in the heterogeneous cavity region, the heterogeneous layer and the cavity layer are arranged in a diagonal pattern, the heterogeneous layer is in the shape of a uniform strip, the width of the heterogeneous layer is 3 mm to 6 mm, and low-strength steel and high-strength steel are arranged alternately in equal volumes in the heterogeneous layer, and the composition ratio of high-strength steel and low-strength steel is approximately 50% each in the cavity structure.

[0014] More preferably, the width of the heterolayer is 3 mm.

[0015] More preferably, the angle β between the heterogeneous interface between the high-strength steel and the low-strength steel in the heterogeneous layer and the vertical plane is 60°. Preferably, the cavity layer is the gap between adjacent heterogeneous layers in the heterogeneous cavity region, and the cavity layer is embedded in the heterogeneous layer in a layered distribution form, with a parallel width of 3 mm to 5 mm.

[0016] More preferably, the parallel width of the cavity layer is 5 mm.

[0017] More preferably, the angle α between the cavity wall and the vertical plane is 70°.

[0018] Preferably, the direction of penetration of the additive heterogeneous cavity anti-jet armor protection structure is from left to right, and the additive heterogeneous cavity anti-jet armor protection structure has several layers from left to right, each layer being composed of two vertically mirrored heterogeneous cavity regions in a periodic cycle.

[0019] Preferably, the protective structure is arranged in three layers. The inclination directions of each cavity layer are alternately opposite, specifically: the first cavity layer is a mirror image of the second cavity layer, and the second cavity layer is also a mirror image of the third cavity layer. The connecting layer between adjacent cavity layers is made of high-strength steel from the heterogeneous layers.

[0020] Preferably, the high-strength steel is a high-strength steel substrate with a yield strength greater than 1000 MPa. The strength of the shaped charge jet protective steel structure is the main factor affecting the structure's penetration resistance; therefore, MS1 mold steel, IN718 nickel-based high-temperature alloy, ER130S-G high-strength steel substrate, or other suitable substrates with a yield strength greater than 1000 MPa can be selected.

[0021] More preferably, the high-strength steel is selected from ER130S-G high-strength steel base material.

[0022] Preferably, the low-strength steel is a low-strength steel substrate with a yield strength of 450-500 MPa. Low-strength steel structures are more prone to plastic deformation and larger plastic deformation when the focused jet penetrates at high speed. Therefore, substrates such as 17-4PH stainless steel, 15-5PH stainless steel, 316L stainless steel, etc., or other suitable substrates with a yield strength of around 500 MPa can be selected.

[0023] More preferably, the low-strength steel is made of 316L stainless steel.

[0024] Preferably, the substrate of the additive heterogeneous cavity anti-jet armor protective structure with high and low strength combination has three heterogeneous cavity regions arranged laterally in sequence, so that the cavity layer is arranged in three layers in the protective structure, and the tilt direction of each cavity layer is alternately opposite. The first and second cavity layers are mirror symmetrical, the second and third cavity layers are mirror symmetrical, and the substrate material between adjacent cavity layers is high-strength steel.

[0025] Preferably, the electric arc additive manufacturing technology is as follows: An electric arc additive manufacturing equipment equipped with a dual wire feeding system is used to alternately feed high-strength steel and low-strength steel wires according to program instructions, and then melt and clad layer by layer through pulse electric arc technology. When depositing into the cavity layer, by controlling the start and stop of wire feeding and the deposition path, a cavity layer with a set tilt angle α is directly formed without support, and it is ensured that high-strength steel and low-strength steel wires are alternately distributed along the cavity layer wall, and the heterogeneous interface maintains a set included angle β. After each cavity layer is deposited, the deposition direction is adjusted to make the cavity layers in adjacent areas mirror symmetrical. After forming, stress-relief annealing and surface cleaning are performed as needed to finally obtain an integrated armor protection structure that combines the predetermined material gradient, cavity geometry and interface orientation.

[0026] This process enables precise control over the spatial distribution of heterogeneous materials, the geometric features of cavity structures, and interface orientation, making it particularly suitable for manufacturing armor protection components with complex internal heterogeneous structures and customized performance gradients. During additive manufacturing, layer-by-layer deposition and melt forming achieve the organic integration of high-strength and low-strength steels at both the micro and macro scales, ensuring the precise angles and metallurgical bonding quality of the heterogeneous interfaces on the cavity structure walls, thereby guaranteeing the overall performance consistency of the structure under impact loads. Based on the three-dimensional model of the protective structure's geometry and material distribution, layer slicing and path planning are performed to generate a deposition program containing material switching instructions.

[0027] Compared with the prior art, the beneficial effects of the present invention are: (1) The composite armor structure in this invention is integrally formed using an electric arc additive manufacturing process. It is a heterogeneous system consisting of alternating combinations of high-strength and low-strength steel with inclined cavities. The core of this structural design lies in: inducing the jet to undergo multiple pitting and alternating deflection through the alternating positive and negative cavity inclination angles; utilizing the plastic deformation capability of low-strength steel to further enhance the disturbance and energy dissipation of the jet, and using high-strength steel to provide the main anti-penetration support, the two work together to form a dynamically changing composite resistance mechanism; the cavity interface forces the jet to continuously pit, dissipating its energy. During the jet penetration process, the cavity wall undergoes significant warping deformation, and the penetration channel is significantly wider and more complex than the typical "wide at the top and narrow at the bottom" inverted funnel-shaped channel in traditional homogeneous armor, significantly damaging the jet stability, and accompanied by plastic deformation of the cavity wall along the penetration direction. Compared with the anti-jet capability of the benchmark material homogeneous 603 armor steel, the mass protection coefficient of the structure of this invention is significantly improved, reaching more than 2.0, achieving a unity of lightweight and high anti-penetration performance, and has important engineering application value.

[0028] (2) The composite armor structure in this invention, through the synergistic effect of the heterogeneous material interface and the inclined cavity, effectively causes the shaped jet to deflect, break and form multiple pits, which greatly interferes with its penetration stability and energy concentration, thereby achieving a protection capability superior to traditional homogeneous armor and conventional laminated structures with a lighter weight; after calculation and comparison of the mass protection coefficient, compared with the 603 homogeneous armor steel used as the benchmark, the mass protection coefficient of the structure of this invention is significantly improved, reaching more than 2.0, which reflects excellent comprehensive protection performance.

[0029] (3) The composite armor structure in this invention achieves the integration of structure, function and lightweight: by combining the alternating distribution of high-strength and low-strength steel and the cavity structure design, the weight of the structure is significantly reduced while ensuring the overall impact resistance performance, thus avoiding the weight increase and associated safety hazards brought about by traditional additional protective structures (such as explosive reactive armor).

[0030] (4) The composite armor structure in this invention is suitable for high-speed / ultra-high-speed impact environments: it is designed for the penetration characteristics of high-speed (8-10 km / s) shaped jets, which expands the application limitations of existing biomimetic stacked structures under low-speed impact conditions and enhances the applicability of armor under actual combat high-speed penetration threats.

[0031] (5) In this invention, the composite armor structure achieves continuous and significant interference with the jet through an integrated structure: the integrated forming of heterogeneous materials and complex cavities achieved by additive manufacturing enables the structure to exert a spatially continuous and mechanistically coordinated interference effect on the jet when it is penetrated. The "S"-shaped channel formed after penetration indicates that the jet penetration path is deflected multiple times and significantly, and its energy is fully dissipated, which directly verifies the significant advantage of the structure of this invention in interference effectiveness.

[0032] (6) The protective performance of the composite armor structure in this invention can be designed and controlled: by adjusting parameters such as cavity tilt angle, material distribution ratio and interlayer configuration, the jet interference mechanism and protection response can be controlled in a targeted manner, thereby improving the adaptability and mission targeting of the structure in the face of diverse threats.

[0033] This invention combines the above advantages, achieving high protective performance of the armor structure while also making the armor structure lighter. Attached Figure Description

[0034] Figure 1 This is a front view of the additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination in Embodiment 1 of the present invention (the high-strength steel in the figure is the same color as the base material, indicating that the two are made of the same material). Figure 2 This is a front view of the additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination in Embodiment 2 of the present invention (the high-strength steel in the figure is the same color as the base material, indicating that the two are made of the same material). Figure 3 This is a front view of the additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination in Embodiment 3 of the present invention (the high-strength steel in the figure is the same color as the base material, indicating that the two are made of the same material). Figure 4 This is a cross-sectional view of the penetration morphology of homogeneous 603 armor steel used in the experimental verification of this invention. Figure 5 This is a cross-sectional view of the penetration morphology results of a high-strength homogeneous structure in the experimental verification of this invention; Figure 6 This is a cross-sectional view of the penetration results of an armor protection structure made of homogeneous 603 armor steel and consistent with the structural configuration of the present invention, used in the experimental verification of the present invention. Figure 7 This is a cross-sectional view of the penetration morphology of the additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination in Embodiment 1 of the present invention; Figure 8 This is a comparison of the penetration resistance performance of various structures in the experimental verification of this invention.

[0035] In the diagram: 1. High-strength steel; 2. Low-strength steel; 3. Cavity layer; 4. 603 armor steel. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1: like Figure 1 As shown, the additive heterogeneous cavity anti-jet armor protection structure of the present invention combines high and low strength materials. The structure is integrally formed by additive manufacturing technology using high-strength steel 1, low-strength steel 2, and a cavity layer 3 with an inclination angle α of 70°.

[0038] In this structure, low-strength steel 2 is 316L stainless steel, and high-strength steel 1 is ER130S-G high-strength steel. Low-strength steel 2 and high-strength steel 1 are alternately distributed on the wall of the cavity layer 3 with an inclination angle α of 70°, and the volume ratio of low-strength steel 2 to high-strength steel 1 is 1:1. Low-strength steel 2 and high-strength steel 1 form a material interface, and this heterogeneous interface forms a 60° angle β with the normal direction of the penetration direction (which runs from left to right and is the vertical plane).

[0039] In this embodiment, the inclined cavities with an inclination angle α of 70° are embedded in the matrix material in a layered manner, distributed in three layers throughout the protective structure, with the inclination directions of each cavity alternating in opposite directions. Specifically, the first and second cavity layers 3 are mirror-symmetrical, and the second and third cavity layers 3 are also mirror-symmetrical. The connecting portions between adjacent cavity layers 3 are made of high-strength steel 1.

[0040] In this embodiment, high-strength steel 1, low-strength steel 2, and cavity layer 3 are integrated into a single structure using additive manufacturing. During additive manufacturing, layering and path planning are performed based on a three-dimensional model of the protective structure's geometry and material distribution, generating a deposition program containing material switching instructions. During manufacturing, an arc additive manufacturing device equipped with a dual-wire feeding system is used. High-strength and low-strength steel wires are alternately fed according to the program instructions, and layer-by-layer cladding is achieved using pulsed arc technology. When depositing into the cavity region, precise control of the wire feeding start / stop and deposition path allows for the direct formation of a cavity structure with a set inclination angle α and a parallel wall thickness of approximately 5 mm without support, ensuring that the heterogeneous materials are alternately distributed along the cavity wall and that the heterogeneous interfaces maintain a set angle β. After each cavity layer is deposited, the deposition direction is adjusted to ensure mirror symmetry between adjacent cavity layers. High-strength steel is continuously deposited into the interlayer cavity substrate to guarantee structural integrity. After forming, stress-relief annealing and surface cleaning are performed as needed, ultimately obtaining an integrated armor protection structure with predetermined material distribution, cavity geometry, and interface orientation.

[0041] Example 2: The difference between this embodiment and Embodiment 1 is that: Figure 2As shown, the distribution ratio of high-strength steel 1 and low-strength steel 2 on the cavity wall has been adjusted from the original approximately 1:1 to a higher content of low-strength steel 2 than high-strength steel 1, and the volume ratio of low-strength steel 2 to high-strength steel 1 is approximately 3. The remaining structural and material parameters are the same as in Example 1.

[0042] Example 3: The difference between this embodiment and Embodiment 1 is that: Figure 3 As shown, the tilt angle α of the cavity changes from α=70° to α=60°, the included angle β changes from 60° to 45°, and the other material parameters are the same as in Example 1.

[0043] Experimental verification: This invention utilizes the high- and low-strength combined additive heterogeneous cavity anti-jet armor protection structure prepared in Example 1 for verification. The armor protection structure prepared in Example 1 is compared with other armor protection structures to analyze the protective performance of different materials under the impact of shaped-charge jets. See details below. Figures 2 to 5 The result of the invasion.

[0044] Based on the penetration depth, this invention calculates the local protection coefficient of the material using the mass protection coefficient formula (1), as follows: (1) in, The density of the structural target; The penetration depth of the structure; and The density and penetration depth of a homogeneous 603 armor steel target.

[0045] Figure 4 A cross-sectional view of the penetration morphology of a homogeneous armor protection structure using 603 armor steel 4 is shown, with a penetration depth of 395.0 mm and a corresponding local mass protection factor of 1.

[0046] Figure 5 The results of a homogeneous armor protection structure using ER130S-G high-strength steel (the same material as high-strength steel 1 in Example 1) under the same penetration conditions are presented. The penetration depth is 284.5 mm, corresponding to a local mass protection factor of 1.4. The results indicate that improving material strength alone has limited effect on improving protective performance.

[0047] Figure 6 The penetration results of a comparative specimen using the same structure as this invention but made of homogeneous armor steel (603 armor steel 4) are shown. The penetration depth was 349.4 mm, and the local mass protection factor was 1.9. (Comparison) Figure 4 This indicates that structural design contributes more significantly to improving protective performance.

[0048] Figure 7 The penetration morphology of the structure of the present invention is shown, with a penetration depth of 305.8 mm and a local mass protection factor of 2.5, indicating that the anti-jet performance of the structure can be significantly enhanced through the synergistic design of heterogeneous materials and cavity structure.

[0049] In this invention, the armor protection structure, after being penetrated by a certain type of armor-piercing projectile, achieved a penetration depth of 305.8 mm, significantly lower than that of homogeneous armor steel structures. Figure 4 The penetration depth is 395.0 mm. According to the mass protection factor formula (1), its local protection factor reaches 2.5. This shows that the present invention achieves a balance between lightweight and high protection performance while improving mass efficiency and space efficiency.

[0050] Figure 8 This paper summarizes the comparison results of the penetration resistance performance of various structures, where A, B, C, and D correspond to... Figure 4 , 5 Among structures 6 and 7, it is evident that the structure of this invention exhibits the best performance in terms of penetration depth control and protection coefficient. Through penetration tests comparing various schemes, including homogeneous armor steel, high-strength homogeneous structures, homogeneous 603 armor steel, and heterogeneous materials with the same structure, the results show that the heterogeneous material and cavity composite structure proposed in this invention has the best protective effectiveness, possessing both a lower penetration depth and a higher protection coefficient. The comparison results are as follows: Figure 8 As shown in the figure. This structure can effectively interfere with the stability and penetration path of the jet, demonstrating good engineering protection potential.

[0051] The present invention further compares the additive heterogeneous cavity anti-jet armor protective structures prepared in Examples 2 and 3 with homogeneous armor steel, high-strength homogeneous structures, and homogeneous 603 armor steel 4 through penetration tests. Their performance is also superior to the aforementioned materials. However, the protective structures prepared in Examples 2 and 3 are slightly lower than the protective structure prepared in Example 1 in terms of penetration depth control and protection coefficient. It can be seen that the present invention can also specifically control the jet interference mechanism and protection response by adjusting parameters such as cavity tilt angle, material distribution ratio, and interlayer configuration, thereby improving the adaptability and mission specificity of the structure in the face of diverse threats.

[0052] The specific mechanism of this invention is as follows: First, the gap effect between the cavity structures causes multiple pitting and fracturing of the jet head, reducing its penetration capability and increasing additional energy dissipation. Second, the change in the tilt angle of the cavity interface subjectes the jet head to unbalanced forces, thereby disturbing the jet head, changing its penetration trajectory, and disrupting the dynamic stability of the jet. Finally, and crucially, this invention uses dissimilar steels with different strengths as the matrix material, where the lower-strength material is more easily deformed, inducing a deviation in the jet head trajectory at the interface of alternating soft and hard materials, changing its stability and weakening its penetration capability. Through the above design, this structure can significantly improve its protective performance while significantly reducing the target plate mass.

[0053] In summary, the above experiments have verified the design advantages of the structure of the present invention: the cavity can effectively induce the jet to open and deflect multiple times, change the transverse velocity component of the jet particles, and weaken its penetration ability into the subsequent structure; at the same time, the introduction of the cavity also reduces the amount of material used, which helps to achieve lightweight structure.

[0054] The above description is only for the purpose of helping to understand the method and core essence of the present invention, but the scope of protection of the present invention is not limited thereto. For those skilled in the art, any equivalent substitutions or modifications made to the technical solution and inventive concept disclosed in the present invention within the scope of the technology disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A high- and low-strength additive heterogeneous cavity anti-jet armor protection structure, the armor protection structure comprising a substrate, characterized in that, The matrix has several arrayed heterogeneous cavity regions; each heterogeneous cavity region is composed of a heterogeneous layer and a cavity layer (3), the heterogeneous layer and the cavity layer (3) are arranged alternately and are designed at an angle; the cavity layers (3) in adjacent heterogeneous cavity regions are mirror symmetrical; The heterogeneous layer comprises a plurality of high-strength steel (1) and a plurality of low-strength steel (2), wherein the volume ratio of the low-strength steel (2) to the high-strength steel (1) is 1 to 3, and the high-strength steel (1) and the low-strength steel (2) are alternately distributed along the wall of the cavity layer (3); the angle α between the wall of the cavity layer (3) and the vertical plane is 60° to 70°, and the angle β between the heterogeneous interface between the high-strength steel (1) and the low-strength steel (2) in the heterogeneous layer and the vertical plane is 45° to 60°; The armor protection structure is integrally formed using arc additive manufacturing technology.

2. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 1, characterized in that, The substrate is made of high-strength steel (1).

3. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 2, characterized in that, The heterogeneous cavity region is rectangular, and several rectangular heterogeneous cavity regions are arranged in a grid, with a base portion of less than 5 mm between adjacent heterogeneous cavity regions on the left and right.

4. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 3, characterized in that, In the heterogeneous cavity region, the heterogeneous layer and the cavity layer (3) are arranged in a diagonal pattern. The heterogeneous layer is in the shape of a uniform strip and the width of the heterogeneous layer is 3 mm to 6 mm. In the heterogeneous layer, low-strength steel (2) and high-strength steel (1) are arranged alternately with equal volume.

5. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 4, characterized in that, The cavity layer (3) is the gap between adjacent heterogeneous layers in the heterogeneous cavity region, and the parallel width of the cavity layer (3) is 3 mm to 5 mm.

6. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 2, characterized in that, The high-strength steel (1) is a high-strength steel substrate with a yield strength greater than 1000 MPa.

7. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 6, characterized in that, The high-strength steel (1) is selected from MS1 mold steel, IN718 nickel-based high-temperature alloy or ER130S-G high-strength steel base material.

8. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 2, characterized in that, The low-strength steel (2) is a low-strength steel base material with a yield strength of 450~500 MPa.

9. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to claim 8, characterized in that, The low-strength steel (2) is selected from 17-4PH stainless steel, 15-5PH stainless steel or 316L stainless steel base material.

10. The additive heterogeneous cavity anti-jet armor protection structure with high and low strength combination according to any one of claims 2-9, characterized in that, The electric arc additive manufacturing technology is specifically as follows: An electric arc additive manufacturing equipment equipped with a dual wire feeding system is used to alternately feed high-strength steel and low-strength steel wires according to program instructions, and then melt and clad layer by layer through pulse electric arc technology. When depositing into the cavity layer (3), by controlling the start and stop of wire feeding and the deposition path, the cavity layer (3) with a set tilt angle is directly formed without support, and the high-strength steel and low-strength steel wires are alternately distributed along the wall of the cavity layer (3), and the heterogeneous interface maintains the set included angle β; After each cavity deposition layer is completed, the deposition direction is adjusted so that the cavity layers (3) of adjacent heterogeneous cavity regions are mirror symmetrical.

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