Orthogonal multi-layer buffer structure for projectile fuze buffer and its strength matching method

Abstract

This application discloses an orthogonal multi-layer buffer structure for projectile fuze buffering, comprising a three-dimensional cell array skeleton; a single primary cell comprises an annular cell and a concave cell connected by a crossbeam; the annular cells in one primary cell and the concave cells in another primary cell are arranged orthogonally to each other, and four primary cells form a closed loop, forming a single secondary cell; multiple secondary cells are spliced ​​together to form a single-layer skeleton; multiple single-layer skeletons are spliced ​​together to form a three-dimensional cell array skeleton; the annular cells between adjacent layers of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other; the gaps in the three-dimensional cell array skeleton are filled with buffer material. This application can achieve projectile fuze buffering and prevent fuze overload damage during penetration.

Description

Technical Field

[0001] The present invention belongs to the field of penetrating projectile fuze buffering, and in particular relates to an orthogonal multi-layer buffering structure for projectile fuze buffering during the penetration process and a strength matching method thereof. Background Art

[0002] In modern warfare, to ensure the safety of high-value targets such as command posts and hangars, fortifications are increasingly being hardened and deepened, placing higher demands on the projectile's penetration capability. Among the many methods for improving projectile penetration performance, increasing the projectile's kinetic energy is one of the most effective. However, during penetration, the fuze within the warhead experiences peak loads of tens of thousands or even hundreds of thousands of g's, far exceeding the load limits of conventional electronic components. This can potentially damage the fuze, leading to premature detonation or misfire. Fuze health directly impacts the destructive effect of the warhead at its destination. Therefore, research on fuze load buffering during penetration is of vital importance. Summary of the Invention

[0003] The purpose of the present invention is to propose an orthogonal multi-layer buffer structure for achieving fuze buffering during the penetration of a projectile, and to propose a strength matching method thereof, thereby reducing the acceleration peak of the internal fuze during the penetration of the projectile, extending the time to reach the acceleration peak, and enabling the projectile to detonate normally after penetrating to a certain depth.

[0004] The technical solution adopted in the present invention is:

[0005] In one aspect, the present application provides an orthogonal multi-layer buffer structure for projectile fuze buffering, comprising a three-dimensional cell array skeleton;

[0006] A single first-level cell consists of a ring cell and a concave cell connected by a beam;

[0007] The annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and a closed loop is formed between the four first-level cells to constitute a single second-level cell;

[0008] Multiple secondary cells are spliced ​​together to form a single-layer skeleton;

[0009] Multiple single-layer skeletons are spliced ​​to form a three-dimensional cell array skeleton; the annular cells between two adjacent layers of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other;

[0010] The gaps of the three-dimensional cell array skeleton are filled with buffer material.

[0011] In one possible implementation, the annular cell is composed of four 1 / 4 circular rings, an upper beam and a lower beam; an upper beam connects two 1 / 4 rings to form an upper half ring; a lower beam connects two 1 / 4 rings to form a lower half ring; and the two ends of the upper half ring are respectively connected to the two ends of the lower half ring.

[0012] In a possible implementation, the concave cell includes an upper beam and a lower beam arranged in parallel, and two inwardly concave elliptical arcs arranged between ends of the upper beam and the lower beam.

[0013] In one possible implementation, the annular cell and the concave cell have the same thickness, length, and height; the annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and the middle of the upper beam and the middle of the lower beam overlap.

[0014] In one possible implementation, different skeleton materials and numbers of skeleton layers are selected to form an orthogonal multi-layer buffer structure according to the peak acceleration requirement that the fuze can withstand.

[0015] In a possible implementation, rubber is used as the buffer material.

[0016] In a possible implementation, the skeletons of each layer of the structure are of the same size.

[0017] In a possible implementation, the structure is stepped, with each layer of the skeleton increasing in size from the internal charge toward the projectile head.

[0018] In a second aspect, the present application provides a projectile, wherein a first buffer layer is installed at the front section of the fuze of the projectile; the first buffer layer adopts the above-mentioned orthogonal multi-layer buffer structure; and the skeletons of each layer of the first buffer layer are the same size.

[0019] On the third aspect, the present application provides a projectile, wherein a second buffer layer is installed at the front section of the internal charge of the projectile; the second buffer layer adopts the above-mentioned orthogonal multi-layer buffer structure; the second buffer layer is stepped, and the skeleton of each layer increases layer by layer from the internal charge to the head of the projectile.

[0020] In a fourth aspect, the present application provides a projectile, wherein a first buffer layer is installed at the front section of the fuze of the projectile, and a second buffer layer is installed at the front section of the internal charge of the projectile; both the first buffer layer and the second buffer layer adopt the above-mentioned orthogonal multi-layer buffer structure; the skeletons of each layer of the first buffer layer are the same size; the second buffer layer is stepped, and the skeletons of each layer increase layer by layer from the internal charge to the head of the projectile.

[0021] In a fifth aspect, the present application provides a strength matching method for an orthogonal multilayer buffer structure, wherein the orthogonal multilayer buffer structure is applied to a projectile, comprising a first buffer layer and a second buffer layer, which are respectively installed at a fuze front section and an internal charge front section of the projectile; the method comprises:

[0022] Determine the peak acceleration during the projectile penetration process a M and the peak acceleration that the fuze can withstand a m , set the initial reduction ratio k 1. Make k 1 a M ≤ a m , according to this relationship, select the skeleton material with the required strength; k The smaller the value of 1, the greater the strength of the skeleton material required;

[0023] Set matching reduction ratio k 2. Determine the thickness of the first cushion layer and the second cushion layer according to the matching reduction ratio H 1 and H 2, both satisfy 0< H 1< D 1,0< H 2< D 2; k The smaller the value of 2, H 1 and H The larger the value of 2;

[0024] in, D 1 is the distance between the front end of the fuze protective shell and the rear end of the internal charge, D 2 is the distance between the front end of the internal charge and the head of the projectile.

[0025] In a fifth aspect, the present application provides a method for preparing an orthogonal multilayer buffer structure, comprising:

[0026] Step 1: Determine the initial reduction ratio k 1 and matching reduction ratio k 2. Determine the material and thickness requirements for the first and second cushion layers based on the strength matching method above;

[0027] Step 2: Based on the thickness requirement, a cushion layer skeleton formed by an orthogonal multi-layer cushion structure is designed using computer modeling software;

[0028] Step 3: Select a skeleton material that meets the required strength, and use 3D printing technology to additively manufacture the first cushion layer and the second cushion layer skeleton;

[0029] Step 4: Fill the gaps in the frame with uncured cushioning material and cure it.

[0030] In a possible implementation, the preparation method further includes: Step 5: installing the first buffer layer at the front section of the fuze, and installing the second buffer layer at the front section of the internal charge, to achieve fuze buffering inside the projectile during penetration.

[0031] Beneficial effects:

[0032] (1) By designing an orthogonal multi-layer buffer structure array skeleton and filling it with buffer materials, a buffer layer can be formed to achieve projectile fuze buffering.

[0033] (2) The first cushion layer (fuze cushion layer) and the second cushion layer (stepped cushion layer) can be installed on the front section of the fuze and the front section of the internal charge respectively. After the impact, the cushion layer undergoes plastic deformation and absorbs a large amount of kinetic energy. Compared with the existing scheme, it can significantly reduce the force and acceleration peak of the fuze.

[0034] (3) The structure can be prepared efficiently and quickly through 3D printing. The principle is simple and it is applicable to a variety of warheads.

[0035] (4) The proposed strength matching method has a wide range of applications. It can select different skeleton materials for different warheads and design two cushion thicknesses to achieve a preset buffering effect, thus achieving a balance between protecting the internal fuze and saving materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of a primary cell of an orthogonal multi-layer buffer structure in one embodiment of the present application;

[0037] Figure 2 A schematic diagram of a secondary cell of an orthogonal multi-layer buffer structure in one embodiment of the present application;

[0038] Figure 3 This is a schematic diagram of a three-dimensional cell array skeleton of an orthogonal multi-layer buffer structure in one embodiment of the present application;

[0039] Figure 4 This is a cross-sectional view of the overall structure of an orthogonal multi-layer buffer structure in one embodiment of the present application;

[0040] Figure 5 This is a schematic diagram of a stepped orthogonal multi-layer buffer structure in one embodiment of the present application;

[0041] Figure 6 This is a schematic diagram of projectile loading in one embodiment of the present application;

[0042] Figure 7 This is an acceleration curve diagram of different buffering effects in an embodiment of the present application.

[0043] Explanation of the accompanying reference numerals: 1 is the rear cover of the base packaging, 2 is the fuze protective shell, 3 is the safety mechanism, 4 is the fuze potting material, 5 is the fuze control circuit, 6 is the front section of the fuze, 7 is the internal charge, 8 is the front section of the internal charge, 9 is the warhead shell, and 10 is the epoxy resin filler. DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the present application, the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1:

[0046] The embodiment of the present application discloses an orthogonal multi-layer buffer structure for projectile fuze buffering, comprising a three-dimensional cell array skeleton;

[0047] A single first-level cell consists of a ring cell and a concave cell, which are connected by a beam;

[0048] The annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and the four first-level cells can form a closed loop to constitute a single second-level cell;

[0049] Multiple secondary cells are spliced ​​together to form a single-layer skeleton;

[0050] Multiple single-layer skeletons are spliced ​​to form a three-dimensional cell array skeleton; the annular cells between two adjacent layers of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other;

[0051] The gaps of the three-dimensional cell array skeleton are filled with buffer material.

[0052] The cushioning material may be a fluid thermosetting cushioning material.

[0053] In some embodiments, different skeleton materials and numbers of skeleton layers can be selected to form an orthogonal multi-layer buffer structure according to the peak acceleration requirements that the fuze can withstand.

[0054] In some embodiments, rubber may be used as the cushioning material.

[0055] Combine Figure 1 The embodiment of the present application uses a first-level cell composed of a ring cell and a concave cell to build an array structure. The ring cell is composed of four 1 / 4 rings, an upper beam and a lower beam; its thickness is , the inner ring radius is r The two 1 / 4 rings above are connected by a length of s , thickness is The two 1 / 4 rings at the bottom are connected in the same way as the two 1 / 4 rings at the top. The length of a ring cell is l , the height is h The thickness of the concave cell is The arc outside the cell is a quarter ellipse arc, and its major and minor semi-axis lengths are a and b , the length of a concave cell is l , the height is h , which has the same dimensions as the length and height of the ring cell.

[0056] Combine Figure 2 In the embodiment of the present application, the annular cell in one primary cell and the concave cell in another primary cell are arranged orthogonally to each other, and a closed loop can be formed between the four primary cells to constitute a single secondary cell; multiple secondary cells are arranged in the same plane to form a single-layer buffer structure skeleton. Figure 3 As shown, the annular cells between two adjacent layers of the skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other, forming a multi-layer orthogonal buffer structure skeleton; the uncured buffer material is filled in the skeleton and cured to obtain the following Figure 4 The buffer structure shown contains n layers, each layer contains m columns of secondary cells, and the thickness of the buffer structure is H 1.

[0057] Figure 5 In one embodiment of the present application, a stepped orthogonal multilayer buffer structure is prepared by first determining the height of the stepped buffer layer according to strength matching. H , then 3D printing is used to prepare a multi-layer skeleton of a stepped buffer layer. Then, uncured buffer material is infiltrated layer by layer from bottom to top and cured to form a stepped buffer structure with multiple stepped layers. The thickness of the buffer structure is H 2.

[0058] During the penetration of the projectile, the force will slow down and the internal structure will continue to move forward. The stepped design allows the internal structure to be compressed layer by layer and each compressed layer provides greater cushioning effect.

[0059] Example 2:

[0060] This embodiment provides a projectile, in which a first buffer layer is installed at the front section of the fuze, and a second buffer layer is installed at the front section of the internal charge; both the first buffer layer and the second buffer layer adopt the above-mentioned orthogonal multi-layer buffer structure; the skeletons of each layer of the first buffer layer are the same size; the second buffer layer is stepped, and the skeletons of each layer increase layer by layer from the internal charge to the head of the projectile.

[0061] Figure 6 The diagram below shows how to load two buffer layers into the projectile. Figure 4The thickness shown is H The first buffer layer of the multi-layer orthogonal buffer 1 is installed at the front section of the fuze of the projectile (the front end surface of the fuze protective shell) 6, Figure 5 The thickness shown is H The stepped cushioning layer 2 is installed at the front section 8 of the internal charge of the projectile. The rest of the projectile consists of the base packaging rear cover 1, the fuze protection shell 2, the safety mechanism 3, the fuze potting material 4, the fuze control circuit 5, the internal charge 7, the warhead shell 9, and the epoxy resin filler 10. There is a certain distance between the front face of the fuze protection shell 2 and the rear face of the internal charge 7. D 1. The distance between the front end of the internal charge 7 and the head of the projectile is D 2. Used for strength matching of structures.

[0062] Example 3:

[0063] This embodiment provides a strength matching method for an orthogonal multilayer buffer structure, wherein the orthogonal multilayer buffer structure is applied to a projectile, and includes a first buffer layer and a second buffer layer, which are respectively installed on the fuze front section and the internal charge front section of the projectile; the method includes:

[0064] Determine the peak acceleration during the projectile penetration process a M and the peak acceleration that the fuze can withstand a m , set the initial reduction ratio k 1. Make k 1 a M ≤ a m , according to this relationship, select the skeleton material with the required strength; k The smaller the value of 1, the greater the strength of the skeleton material required;

[0065] Set matching reduction ratio k 2. Determine the thickness of the first cushion layer and the second cushion layer according to the matching reduction ratio H 1 and H 2, both satisfy 0< H 1< D 1,0< H 2< D 2; k The smaller the value of 2, H 1 and H The larger the value of 2;

[0066] In this way, it is possible to ensure that the action time of the buffer structure is extended, the acceleration changes smoothly, and efficient buffering of the fuze is achieved.

[0067] The principle of this embodiment is: the resistance experienced by a projectile with a circular cross-section during penetration is expressed as:

[0068] (1)

[0069] In the formula F is the force on the projectile, C 1 and C 2 is a dimensionless coefficient related to parameters such as target material and projectile head shape, Y is the yield strength of the target, ρ is the target density, v is the current velocity of the projectile.

[0070] During the penetration process, the acceleration expression of the projectile is:

[0071] (2)

[0072] In the formula M is the mass of the projectile, and solving the equation yields the deceleration time:

[0073] (3)

[0074] In the formula Q 1 and Q 2 is the integration constant, v 0 is the initial penetration velocity. From the above formula, we can see that the greater the velocity reduction, the longer it takes. When the projectile's acceleration reaches its peak, the larger the area enclosed by its acceleration curve and the time axis, the greater the velocity reduction.

[0075] Figure 7 The acceleration curve of the fuze with different buffering effects is shown in the figure. a M is the peak acceleration, a m It is the maximum acceleration that the fuze can withstand during normal operation; k 1 is the initial reduction ratio, k 2 is the matching reduction ratio, and both satisfy 0< k 2, k 1<1; the smaller the two values, the better the cushioning effect. Without a cushioning layer, the fuze moves with the projectile, resulting in large peak accelerations and rapid changes, which can easily damage the fuze. With the addition of a cushioning layer, the fuze's peak acceleration is reduced compared to the absence of a cushioning layer. After strength matching, the peak acceleration is further reduced and the time it takes for the acceleration to reach peak is extended, ensuring smooth fuze movement.

[0076] Example 4:

[0077] The present invention provides a method for preparing an orthogonal multilayer buffer structure, comprising:

[0078] Step 1: Determine the initial reduction ratio k 1 and matching reduction ratio k 2. Determine the materials and thickness requirements of the two cushion layers based on the strength matching method;

[0079] Step 2: Based on the thickness requirement, a cushion layer skeleton formed by an orthogonal multi-layer cushion structure is designed using computer modeling software;

[0080] Step 3: Select a skeleton material that meets the required strength and use 3D printing technology to manufacture the cushion layer skeleton;

[0081] Step 4: Fill the gaps in the frame with uncured cushioning material and cure it;

[0082] Step 5: Install the first buffer layer at the front section of the fuze and the stepped pad layer at the front section of the internal charge to achieve fuze buffering inside the projectile during penetration.

[0083] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. An orthogonal multi-layer buffer structure for projectile fuze buffering, characterized in that: including a three-dimensional cell array skeleton; A single first-level cell consists of a ring cell and a concave cell connected by a beam; The annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and a closed loop is formed between the four first-level cells to constitute a single second-level cell; Multiple secondary cells are spliced ​​together to form a single-layer skeleton; Multiple single-layer skeletons are spliced ​​to form a three-dimensional cell array skeleton; the annular cells between two adjacent layers of the three-dimensional cell array skeleton are arranged orthogonally to each other, and the concave cells are also arranged orthogonally to each other; The gaps of the three-dimensional cell array skeleton are filled with a buffer material; The annular cell is composed of four 1 / 4 rings, an upper beam and a lower beam; one upper beam connects two 1 / 4 rings to form an upper half ring; one lower beam connects two 1 / 4 rings to form a lower half ring; the two ends of the upper half ring are respectively connected to the two ends of the lower half ring; The concave cell includes an upper beam and a lower beam arranged in parallel, and two inwardly concave elliptical arcs arranged between two ends of the upper beam and the lower beam.

2. The structure according to claim 1, characterized in that The thickness, length and height of the annular cell and the concave cell are all the same; the annular cell in one first-level cell and the concave cell in another first-level cell are arranged orthogonally to each other, and the middle of the upper beam and the middle of the lower beam overlap.

3. The structure according to claim 1, characterized in that According to the peak acceleration requirement of the fuze, different skeleton materials and skeleton layers are selected to form an orthogonal multi-layer buffer structure.

4. The structure according to any one of claims 1 to 3, characterized in that The sizes of the skeleton layers are the same, or the structure is stepped, and the sizes of the skeleton layers increase layer by layer from the internal charge to the direction between the heads of the projectiles.

5. A projectile, characterized in that: The front section of the fuze of the projectile is equipped with a first buffer layer; the first buffer layer adopts an orthogonal multi-layer buffer structure as described in any one of claims 1 to 3; the skeletons of each layer of the first buffer layer are the same size; or A second buffer layer is installed at the front section of the internal charge of the projectile; the second buffer layer adopts the orthogonal multi-layer buffer structure described in any one of claims 1 to 3; the second buffer layer is stepped, and the skeleton of each layer increases layer by layer from the internal charge to the head of the projectile.

6. A projectile, characterized in that: The front section of the fuze of the projectile is equipped with a first buffer layer, and the front section of the internal charge of the projectile is equipped with a second buffer layer; the first buffer layer and the second buffer layer both adopt the orthogonal multi-layer buffer structure described in any one of claims 1 to 3; the skeletons of each layer of the first buffer layer are the same size; the second buffer layer is stepped, and the skeletons of each layer increase layer by layer from the internal charge to the head of the projectile.

7. A strength matching method for an orthogonal multilayer buffer structure, characterized in that: The orthogonal multilayer buffer structure is applied to the projectile according to claim 6, comprising a first buffer layer and a second buffer layer, which are respectively installed on the fuze front section and the internal charge front section of the projectile; the method comprises: Determine the peak acceleration during the projectile penetration process a M and the peak acceleration that the fuze can withstand a m , set the initial reduction ratio k 1. Make k 1 a M ≤ a m , according to this relationship, select the skeleton material with the required strength; k The smaller the value of 1, the greater the strength of the skeleton material required; Set matching reduction ratio k 2. Determine the thickness of the first cushion layer and the second cushion layer according to the matching reduction ratio H 1 and H 2, both satisfy 0< H 1< D 1,0< H 2< D 2; k The smaller the value of 2, H 1 and H The larger the value of 2; in, D 1 is the distance between the front end of the fuze protective shell and the rear end of the internal charge, D 2 is the distance between the front end of the internal charge and the head of the projectile.

8. A method for preparing an orthogonal multilayer buffer structure, characterized in that: include: Step 1: Determine the initial reduction ratio k 1 and matching reduction ratio k 2. Determine the material and thickness requirements for the first cushion layer and the second cushion layer skeleton according to the strength matching method described in claim 7; Step 2: Based on the thickness requirement, a cushion layer skeleton formed by an orthogonal multi-layer cushion structure is designed using computer modeling software; Step 3: Select a skeleton material that meets the required strength, and use 3D printing technology to additively manufacture the first cushion layer and the second cushion layer skeleton; Step 4: Fill the gaps in the frame with uncured cushioning material and cure it.

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