A method for obtaining penetration depth considering self-sharpening

Abstract

The present invention provides a method for obtaining penetration depth taking into account self-sharpening, comprising the following steps: 1. First, material parameters of a projectile and a target plate are obtained, and an initial length, initial projectile velocity, and self-sharpening projectile half-angle of the projectile are set; 2. Then, a critical projectile velocity that generates a fluid-like region in the target plate and a critical projectile velocity that can produce a penetration effect are obtained; 3. Then, a calculation time step is set to iteratively obtain the penetration velocity, projectile length, projectile velocity, and penetration depth within the step length. If the penetration velocity is less than 0, the projectile length is less than 0, or the projectile velocity is less than the critical projectile velocity that can produce a penetration effect, the loop is exited, and the depth of each time step is integrated to obtain the total penetration depth. The present invention can be widely applied to various new self-sharpening armor-piercing materials to efficiently and accurately calculate the penetration depth.

Description

Technical Field

[0001] The present invention relates to the technical field of self-sharpening projectile penetration depth prediction, and in particular to a method for obtaining the penetration depth taking self-sharpening into consideration. Background Art

[0002] Kinetic energy armor-piercing rounds, a key component of modern ammunition systems, rely primarily on the powerful kinetic energy contained in the projectile itself to penetrate armor protection. The core material selection is extremely sophisticated, often carefully crafted from high-density materials such as depleted uranium alloys and tungsten alloys. These materials have high density and hardness, giving the core extremely high strength, allowing it to maintain structural integrity under high-speed impact and possess strong armor-piercing capabilities. When violently colliding with armor, the huge kinetic energy instantly generates a powerful impact force, enough to allow the core to successfully penetrate the armor like a sharp blade, causing serious damage to personnel and equipment inside the target. Because it relies entirely on kinetic energy to penetrate armor, without involving other complex auxiliary mechanisms such as chemical energy, it demonstrates stable and reliable performance and excellent armor-piercing effectiveness when facing various armored targets.

[0003] Among the many key metrics for measuring destructive power, penetration depth is undoubtedly paramount. It directly reflects how deeply the destructive element can penetrate the target. For example, in military combat, an armor-piercing round with a greater penetration depth can penetrate thicker armor and penetrate deep into an enemy tank, causing severe damage to key components such as the engine and ammunition compartment, thereby completely disabling the enemy equipment. Similarly, in other scenarios, greater penetration depth increases the ability to effectively inflict substantial damage to key internal structures or components of the target, significantly enhancing the destructive effect.

[0004] However, traditional methods for calculating penetration depth have long suffered from significant shortcomings. Because they fail to account for the self-sharpening effect and lack clear criteria for determining when a projectile has lost its penetration effectiveness, significant deviations often occur when calculating penetration depth. For example, in military applications, in combat scenarios such as precision strikes and long-range fire support, where penetration depth accuracy is extremely demanding, the continued use of traditional calculation methods is likely to lead to significant errors in the assessment of the weapon system's destructive effectiveness. This not only misleads the direction of weapon and equipment research and development, leading to a misallocation of R&D resources, but also affects tactical formulation, significantly compromising the scientific nature of combat plans. In the field of civilian protective engineering, such as nuclear power plant protection facilities and explosion-proof design of important buildings, inaccurate penetration depth calculations mean that the protective structure design will fail to meet actual protection needs, posing a significant safety hazard to people's lives and property.

[0005] Therefore, to accurately describe the penetration process and improve the accuracy of penetration depth calculation, it is imperative to develop a penetration depth calculation method that takes into account the self-sharpening effect. This new method must comprehensively consider multiple factors, including the projectile material properties, its shape during the self-sharpening process, and its mechanical behavior during penetration. This will provide a more reliable theoretical basis and calculation method for penetration research and practical engineering applications. Summary of the Invention

[0006] In response to the technical problems existing in the above-mentioned background technology, the present invention proposes a method for obtaining the penetration depth taking into account self-sharpening. The method has a reasonable concept and can more accurately calculate the penetration depth of self-sharpening materials, improve the prediction accuracy, and can be widely applied to various new self-sharpening armor-piercing materials to efficiently and accurately calculate the penetration depth.

[0007] To solve the above technical problems, the present invention provides a method for obtaining the penetration depth taking into account self-sharpening, which mainly includes the following steps:

[0008] Step 1: First, obtain the material parameters of the projectile and target plate, and set the initial length of the projectile, initial projectile velocity, and self-sharpening projectile half angle;

[0009] Step 2: Obtain the critical projectile velocity that causes a fluid-like region to appear in the target plate and the critical projectile velocity that can produce a penetration effect;

[0010] Step 3: Then set the calculation time step and iterate to obtain the penetration speed, projectile length, projectile speed and penetration depth within the step. If the penetration speed is less than 0 or the projectile length is less than 0 or the projectile speed is less than the critical projectile speed that can produce the penetration effect, then jump out of the loop and integrate the depth of each time step to obtain the total penetration depth.

[0011] The method for obtaining the penetration depth considering self-sharpening, wherein: the material parameters of the projectile in step 1 include the projectile density , elastic wave velocity of the projectile , projectile yield strength ;

[0012] The material parameters of the target plate in step 1 include the target plate density , target plate yield strength , Hugoniot strength of target plate and target plate elastic modulus .

[0013] The method for obtaining the penetration depth considering self-sharpening, wherein the specific process of step 2 is:

[0014] Step 2.1: Solve the critical projectile velocity for generating a fluid-like region using the following equation (1):

[0015] ;

[0016] in, is the critical projectile velocity for generating the fluid-like region, It is a self-sharpening bullet with half angle;

[0017] Step 2.2: Use the following equation (2) to solve the critical projectile velocity for penetration:

[0018] ;

[0019] in, The critical projectile velocity for producing a penetration effect. The method for obtaining the penetration depth considering self-sharpening, wherein the specific process of step 3 is:

[0020] Step 3.1: Get the penetration velocity in step i

[0021] When the projectile speed V (i) Greater than the critical projectile velocity for generating a fluid-like region When the penetration speed The first kind equation is:

[0022] ;

[0023] When the projectile speed V (i) Greater than the critical projectile velocity for penetration But it is less than the critical projectile velocity that produces the fluid-like zone When the penetration speed The second kind of equation:

[0024] ;

[0025] in, ;

[0026] Step 3.2: Set the time step to dt and solve the penetration depth in step i :

[0027] ;

[0028] Step 3.3: Solve for the next step of projectile length :

[0029] ;

[0030] Step 3.4: Solve for the next step of the projectile velocity :

[0031] ;

[0032] Step 3.5: Repeat steps 3.1-3.4 until or or , then jump out of the loop and stop solving;

[0033] Step 3.6: Penetration depth for each step Sum them up to get the total penetration depth.

[0034] By adopting the above technical solution, the present invention has the following beneficial effects:

[0035] The present invention considers the method for obtaining the penetration depth of self-sharpening materials. The concept is reasonable and fills the gap in the current field. It can more accurately calculate the penetration depth of self-sharpening materials and improve the accuracy of prediction. It also has the following advantages:

[0036] (1) Low cost: Compared with actual penetration experiments, the method for obtaining the self-sharpening penetration depth of the present invention only requires obtaining the required material parameters. There is no need to manufacture real projectiles and targets, nor is there any need to use expensive experimental equipment such as high-speed launchers. Moreover, there will be no equipment damage or material waste due to experimental failure, thereby greatly reducing research costs.

[0037] (2) Short cycle: The preparation work for actual penetration experiments is complicated, and it often takes a long time from designing the experimental plan, manufacturing the experimental samples to conducting experimental tests. However, the method for obtaining the penetration depth taking into account the self-sharpening method of the present invention can obtain the calculation result of the penetration depth in a short time by iterative calculation according to the steps, providing timely data support for research and design, and accelerating the research and development process.

[0038] (3) Good repeatability: Under the same calculation conditions, the method for obtaining the penetration depth considering self-sharpening can obtain stable and repeatable results; this helps researchers to simulate different parameter combinations multiple times and deeply analyze the influence of various factors on the penetration depth without worrying about the fluctuation of experimental conditions interfering with the results.

[0039] (4) High safety: Penetration experiments involve high-speed moving projectiles and possible explosions, which pose certain safety risks. The present invention considers the method of obtaining the penetration depth of self-sharpening and does not require field tests, so there is no such safety hazard. Researchers can conduct simulation analysis of various complex working conditions in a safe environment.

[0040] (5) Convenient parameter adjustment: In the method for obtaining the penetration depth of the self-sharpening projectile of the present invention, researchers can easily adjust various parameters, such as the material properties, geometric shape, speed of the projectile in step 1), and the properties of the target material, and quickly analyze the influence of different parameters on the penetration depth, thereby optimizing the design scheme; in actual experiments, changing these parameters often requires re-manufacturing samples or adjusting experimental equipment, which is difficult and costly to operate.

[0041] (6) Ability to obtain rich data: The method for obtaining the penetration depth of the present invention taking into account the self-sharpening can not only obtain the key result of the penetration depth, but also obtain detailed field variable information such as the projectile velocity, length, and penetration speed at each moment in the penetration process in real time in step 3). These rich data are helpful for a deeper understanding of the penetration mechanism and provide a more comprehensive basis for theoretical research and engineering applications. However, it is often difficult to obtain such detailed information in actual experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 Flowchart of a method for obtaining a self-sharpening penetration depth according to the present invention. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] The present invention will be further explained below with reference to specific embodiments.

[0046] like Figure 1 As shown, this embodiment provides a method for obtaining the penetration depth considering self-sharpening. First, the material parameters of the projectile and the target plate are obtained, and the initial length of the projectile is set. , initial projectile velocity and self-sharpening bullet half angle ; Then calculate the critical projectile velocity that causes a fluid-like area to appear in the target plate and the critical projectile velocity that can produce a penetration effect; then set the calculation time step and iteratively calculate the penetration velocity, projectile length, projectile velocity and penetration depth within the step. If the penetration velocity is less than 0 or the projectile length is less than 0 or the projectile velocity is less than the critical projectile velocity that can produce a penetration effect, then jump out of the loop and integrate the depth of each time step to calculate the penetration depth.

[0047] The present invention considers a method for obtaining the self-sharpening penetration depth, which mainly includes the following steps:

[0048] S100, first obtain the material parameters of the projectile and the target plate and set the initial length of the projectile, the initial projectile velocity and the self-sharpening bullet half angle:

[0049] Projectile density , elastic wave velocity of the projectile , projectile yield strength , target plate density , target plate yield strength , target plate Hugoniot strength , target plate elastic modulus .

[0050] Set the initial length of the projectile , initial impact velocity , self-sharpening bullet half angle .

[0051] S200, calculate the critical projectile velocity that causes a fluid-like region to appear in the target plate and the critical projectile velocity that can produce a penetration effect, and set the calculation time step:

[0052] Calculate the critical projectile velocity for generating a fluid-like region:

[0053] ;

[0054] in, is the critical projectile velocity for generating the fluid-like region, It is a self-sharpening bullet with half angle;

[0055] Calculate the critical projectile velocity for penetration:

[0056] ;

[0057] in, The critical projectile velocity for penetration.

[0058] S300, calculate the penetration speed in step i

[0059] When the projectile speed Greater than the critical projectile velocity that produces a fluid-like zone When the penetration speed The first kind equation is:

[0060] ;

[0061] When the projectile speed Greater than the critical projectile velocity for penetration But it is less than the critical projectile velocity that produces the fluid-like zone When the penetration speed The second kind of equation:

[0062] ;

[0063] in, .

[0064] S400, set the time step to dt, and solve the penetration depth in step i :

[0065] ;

[0066] S500, calculate the length of the projectile in the next step :

[0067] ;

[0068] S600, calculate the next projectile speed :

[0069] ;

[0070] S700, loop the above steps S400-S600 until or or , then jump out of the loop and stop calculating.

[0071] S800, penetration depth at each step Sum them up to get the total penetration depth.

[0072] The following is a pseudo-program code flow for calculating the penetration depth, and further describes the method for obtaining the penetration depth in consideration of self-sharpening.

[0073] The specific calculation method of the above total penetration depth is as follows:

[0074] 1. Parameter initialization

[0075] 1. Basic parameter settings:

[0076] - Set the number of loops, which determines the number of iterative calculation steps;

[0077] - Determine the initial length and initial velocity of the projectile;

[0078] - Set the time step for loop iterative calculation.

[0079] 2. Material parameter setting:

[0080] - Projectile material parameters: density, elastic modulus, yield strength;

[0081] - Target material parameters: density, elastic modulus, yield strength, Hugoniot elastic limit;

[0082] - Self-sharpening bullet half angle;

[0083] 3. Calculate relevant parameters:

[0084] - Calculate the critical projectile velocity for generating a fluid-like zone and the critical projectile velocity for producing a penetration effect based on the available parameters).

[0085] 2. Variable initialization

[0086] 1. Create a projectile length variable to store the length of the projectile at different times;

[0087] 2. Create a penetration speed variable to store the penetration speed at different times;

[0088] 3. Create a projectile speed variable to store the speed of the projectile at different times;

[0089] 4. Create a penetration depth increment variable to store the penetration depth increment at each time step;

[0090] 5. Create a total penetration depth variable to store the total penetration depth at different times.

[0091] 3. Main loop calculation

[0092] In each loop, do the following:

[0093] 1. Determine the equation based on the speed range:

[0094] - If the current projectile velocity is greater than the critical projectile velocity for generating a fluid-like zone, solve the equations of the first kind;

[0095] - If the current projectile velocity is between the critical projectile velocity for producing a fluid-like zone and the critical projectile velocity for producing a penetration effect, then solve the equation of the second kind;

[0096] - If the current projectile speed is less than the critical projectile speed for penetration, the loop is exited and the calculation is stopped;

[0097] 2. Solve the equation: Solve the equation defined above, take the first solution and assign it to the penetration velocity;

[0098] - If the penetration speed is less than 0, exit the loop.

[0099] 3. Update penetration depth and projectile status:

[0100] - Calculate the penetration depth increment for the current time step, which is the penetration velocity multiplied by the time step;

[0101] - Update the total penetration depth by adding the total penetration depth of the previous step to the penetration depth increment of the current time step;

[0102] - Update the length of the projectile by subtracting the erosion length of the current time step from the length of the previous step;

[0103] - Updated the projectile's speed;

[0104] 4. Check the projectile length: If the updated projectile length is less than 0, exit the loop and stop the calculation.

[0105] 4. Result Output

[0106] After the cycle is completed, the maximum value of the total penetration depth is found and used as the final penetration depth.

[0107] The following is further explained using WMoFeNi projectiles and 45# steel targets as materials.

[0108] WMoFeNi projectile: projectile density 11.2g / cm 3 , elastic wave velocity of projectile is 3895m / s, yield strength of projectile is 850Mpa

[0109] 45# steel target: target plate density 7.8g / cm 3 , the target plate yield strength is 500MPa, the target plate Hugoniot strength is 1.1GPa, and the target plate elastic modulus is 200GPa.

[0110] The initial length of the projectile is 45mm, the initial impact velocity is 1200m / s, and the self-sharpening bullet half angle is 45 degrees.

[0111] Substituting the calculation into the result, the penetration depth is 24 mm, which is in good agreement with the test result of 23.6 mm. Without considering the self-sharpening effect, the calculation result is only 21.7 mm.

[0112] The present invention has a reasonable concept, can more accurately calculate the penetration depth of self-sharpening materials, improve prediction accuracy, and can be widely applied to various new self-sharpening armor-piercing materials to efficiently and accurately calculate the penetration depth.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for obtaining penetration depth considering self-sharpening, characterized in that: The main steps include: Step 1: First obtain the material parameters of the projectile and target plate, and set the initial length of the projectile , initial projectile velocity and self-sharpening bullet half angle ; The material parameters of the projectile include projectile density , elastic wave velocity of the projectile , projectile yield strength ; The material parameters of the target plate include the target plate density of the target plate , target plate yield strength , Hugoniot strength of target plate and target plate elastic modulus ; Step 2: Obtain the critical projectile velocity that causes a fluid-like region to appear in the target plate and the critical projectile velocity that can produce a penetration effect; the specific process is: Step 2.1: Solve the critical projectile velocity for generating a fluid-like region using the following equation (1): ； in, is the critical projectile velocity for generating the fluid-like region, It is a self-sharpening bullet with half angle; Step 2.2: Use the following equation (2) to solve the critical projectile velocity for penetration: ； in, Critical projectile velocity for penetration; Step: 3: Then set the calculation time step and iterate to obtain the penetration speed, projectile length, projectile speed and penetration depth within the step. If the penetration speed is less than 0 or the projectile length is less than 0 or the projectile speed is less than the critical projectile speed that can produce the penetration effect, then jump out of the loop and integrate the depth of each time step to obtain the total penetration depth.

2. The method for obtaining the penetration depth taking into account self-sharpening as claimed in claim 1, characterized in that , the specific process of step 3 is: Step 3.1: Get the penetration velocity in step i ; When the projectile speed V (i) Greater than the critical projectile velocity for generating a fluid-like region When the penetration speed The first kind equation is: ； When the projectile speed V (i) Greater than the critical projectile velocity for penetration But it is less than the critical projectile velocity that produces the fluid-like zone When the penetration speed The second kind of equation: ； in, ; Step 3.2: Set the time step to dt and solve the penetration depth in step i : ； Step 3.3: Find the projectile length for the next step : ； Step 3.4: Solve for the next step of the projectile velocity : ； Step 3.5: Repeat steps 3.1-3.4 until or or , then jump out of the loop and stop solving; Step 3.6: Penetration depth for each step Sum them up to get the total penetration depth.

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