Simulation analysis method and device for multi-bullet shooting bulletproof composite structure

Abstract

The invention provides a simulation analysis method and device for a multi-bullet shooting bulletproof composite structure, and relates to the technical field of bulletproof composite structure design. The method comprises the following steps: defining bullet speeds, a first starting moment of firing of a first bullet in multiple bullets and constraint duration of the bullet speeds, and obtaining shooting data corresponding to each bullet; based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the constitutive equation parameters of the material model, the contact algorithm, the connection relation and the shooting data, the impact process between each bullet and the bulletproof composite structure is simulated, and a simulation analysis result is obtained; the simulation analysis result is used for determining the performance of the bulletproof composite structure. According to the method, the deviation between the simulation analysis result and the actual result of the bulletproof composite structure is reduced, and the accuracy of judging the performance of the bulletproof composite structure is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bulletproof composite structure design, and in particular to a simulation analysis method and device for a multi-bullet shooting bulletproof composite structure. BACKGROUND

[0002] The existing simulation method for a bulletproof composite structure subjected to bullet shooting is mostly directed to single shooting, and ignores the material performance degradation (such as fragmentation and delamination expansion of a fiber laminate) and residual stress accumulation effect caused by continuous impact of multiple bullets, resulting in a large deviation between the simulation result and the actual result, so that the performance of the bulletproof composite structure cannot be accurately obtained through the simulation method. SUMMARY

[0003] The present application provides a simulation analysis method and device for a multi-bullet shooting bulletproof composite structure, to solve the defects in the prior art that the material performance degradation and residual stress accumulation effect caused by continuous impact of multiple bullets are ignored, resulting in a large deviation between the simulation result and the actual result, so that the performance of the bulletproof composite structure cannot be accurately obtained through the simulation method, and to realize, on the basis of the combination of smoothed particle hydrodynamics and finite element method, defining the bullet speed and the shooting time data of each bullet, simulating the shooting process of multiple bullets on the bulletproof composite material, and considering the actual factors of the material performance degradation and residual stress accumulation effect of the bulletproof composite structure under the impact of the previous bullets in the simulation process, thereby reducing the deviation between the simulation analysis result and the actual result of the bulletproof composite structure and further improving the accuracy of the performance judgment of the bulletproof composite structure.

[0004] The present application provides a simulation analysis method for a multi-bullet shooting bulletproof composite structure, comprising: determining a first fluid particle model corresponding to a bullet, a second fluid particle model corresponding to a bulletproof composite structure, and a buffer layer finite element model corresponding to the bulletproof composite structure; defining material model constitutive equation parameters corresponding to each of the first fluid particle model, the second fluid particle model, and the buffer layer finite element model; defining a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model; defining a bullet speed, a first start time of a first bullet in multiple bullets, and a constraint time length of the bullet speed, to obtain shooting data corresponding to each bullet; based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, simulating the impact process between each bullet and the bulletproof composite structure to obtain a simulation analysis result; the simulation analysis result is used to determine the performance of the bulletproof composite structure.

[0005] According to the simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the application, the simulation analysis results include the fragmentation deformation diagram of the bulletproof composite structure, the first stress damage nephogram of the bulletproof composite structure, the stress time history curve of the bulletproof composite structure, and the fragmentation cone shape nephogram of the bulletproof composite structure, the fragmentation deformation nephogram and the kinetic energy decay curve of each bullet, the deformation diagram in the buffer layer finite element model, the delamination information between the sub-buffer layers in the buffer layer finite element model, the second stress damage nephogram of the buffer layer finite element model, and the back bulge information of the buffer layer finite element model; the impact process between each bullet and the bulletproof composite structure is simulated based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, and simulation analysis results are obtained, including: the impact simulation results are obtained by simulating the impact process between each bullet and the bulletproof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the contact algorithm, the connection relationship, and the shooting data; the bulletproof composite structure in the impact simulation results is analyzed to obtain the fragmentation deformation diagram of the bulletproof composite structure, the first stress damage nephogram of the bulletproof composite structure, the stress time history curve of the bulletproof composite structure, and the fragmentation cone shape nephogram of the bulletproof composite structure; each bullet in the impact simulation results is analyzed to obtain the fragmentation deformation nephogram and the kinetic energy decay curve of each bullet; the buffer layer finite element model in the impact simulation results is analyzed to obtain the deformation diagram in the buffer layer finite element model, the delamination information between the sub-buffer layers in the buffer layer finite element model, the second damage nephogram of the buffer layer finite element model, and the back bulge information of the buffer layer finite element model.

[0006] According to the simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the application, the performance includes the number threshold of the bulletproof composite structure to withstand multiple bullets, and the simulation analysis results include the damage nephogram of the bulletproof composite structure and the stress time history curve of the bulletproof composite structure. After the simulation analysis results are obtained, the method further includes: based on the damage nephogram of the bulletproof composite structure and the stress time history curve of the bulletproof composite structure, evaluating the number threshold of the bulletproof composite structure to withstand multiple bullets.

[0007] According to the simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the application, the performance includes the target thickness ratio of the material layer and the buffer layer in the bulletproof composite structure, after the simulation analysis result is obtained, the method further includes: determining the target simulation analysis result corresponding to the first thickness ratio of the material layer and the buffer layer in the bulletproof composite structure; in the case that the simulation analysis result meets the target simulation analysis result, reducing the first thickness ratio to obtain a second thickness ratio; based on the second thickness ratio, simulating the impact process between each bullet and the bulletproof composite structure corresponding to the second thickness ratio to obtain a second simulation analysis result corresponding to the second thickness ratio; based on the comparison result of the second simulation analysis result and the target simulation analysis result, continuously adjusting the second thickness ratio until the simulation analysis result corresponding to the adjusted thickness ratio does not meet the target simulation analysis result, and determining the last thickness ratio of the adjusted thickness ratio as the target thickness ratio of the material layer and the buffer layer.

[0008] According to the simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the application, the definition of the bullet speed and the first start time of the first bullet shooting in the multi-projectile and the constraint time length of the bullet speed are obtained, and the shooting data corresponding to each bullet is obtained, including: based on the first start time and the constraint time length of the bullet speed, determining the first constraint stop time of the first bullet; based on the first start time, the first constraint stop time, the bullet shooting interval and the bullet speed constraint time length, determining the second start time and the second constraint stop time of each second bullet shooting; the bullet speed, the first start time and the first constraint stop time of the first bullet shooting, the second start time and the second constraint stop time of each second bullet shooting are determined as the shooting data corresponding to each bullet.

[0009] According to the simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the application, the connection relationship includes a first connection relationship and a second connection relationship, the contact algorithm includes a first contact algorithm, a second contact algorithm and a third contact algorithm, the definition of the connection relationship and the contact algorithm between the second fluid particle model and the buffer layer finite element model includes: adopting a point-surface contact mode to establish a first connection relationship between the second fluid particle model and the buffer layer finite element model; adopting a surface layer failure mode to establish a second connection relationship between the sub-buffer layers in the buffer layer finite element model; defining the first contact algorithm between the first fluid particle model and the second fluid particle model, the second contact algorithm between the first fluid particle model and the buffer layer finite element model, and the third contact algorithm between the sub-buffer layers in the buffer layer finite element model.

[0010] The application further provides a simulation analysis device for the multi-shot bullet impact bulletproof composite structure. A model determining module is configured to determine a first fluid particle model corresponding to a bullet, a second fluid particle model corresponding to the bulletproof composite structure, and a buffer layer finite element model corresponding to the bulletproof composite structure. A first defining module is configured to define material model constitutive equation parameters corresponding to the first fluid particle model, the second fluid particle model, and the buffer layer finite element model. A second defining module is configured to define a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model. A third defining module is configured to define a bullet speed, a first start time of a first bullet in the multi-shot bullet, and a constraint time length of the bullet speed, to obtain shooting data corresponding to each bullet. A simulation module is configured to simulate an impact process between each bullet and the bulletproof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, to obtain a simulation analysis result.

[0011] The application further provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor.

[0012] The application further provides a non-transitory computer-readable storage medium having a computer program stored thereon, the computer program being executable on a processor to implement the simulation analysis method for the multi-shot bullet impact bulletproof composite structure.

[0013] The application further provides a computer program product including a computer program, the computer program being executable on a processor to implement the simulation analysis method for the multi-shot bullet impact bulletproof composite structure.

[0014] The simulation analysis method and device for the multi-shot bullet impact bulletproof composite structure provided by the application, by determining the first fluid particle model corresponding to the bullet, the second fluid particle model corresponding to the bulletproof composite structure and the buffer layer finite element model corresponding to the bulletproof composite structure; defining the material model constitutive equation parameters corresponding to the first fluid particle model, the second fluid particle model and the buffer layer finite element model respectively; defining the connection relationship and contact algorithm between the second fluid particle model and the buffer layer finite element model; defining the bullet speed, the first start time of the first bullet firing in the multi-shot bullet and the constraint time length of the bullet speed, obtaining the shooting data corresponding to each bullet; based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship and the shooting data, the impact process between each bullet and the bulletproof composite structure is simulated to obtain the simulation analysis result; the simulation analysis result is used to determine the performance of the bulletproof composite structure. In this way, on the basis of the combination of smoothed particle hydrodynamics and finite element method, the bullet speed and the shooting time data of each bullet are defined, the shooting process of the multi-shot bullet on the bulletproof composite material is simulated, and the actual factors of the material performance degradation and residual stress accumulation effect of the bulletproof composite structure under the impact of the previous bullet are considered in the simulation process, the deviation between the simulation analysis result of the bulletproof composite structure and the actual result is reduced, and the accuracy of the performance judgment of the bulletproof composite structure is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0016] Figure 1 is the flowchart of the simulation analysis method for the multi-shot bullet impact bulletproof composite structure provided by the application.

[0017] Figure 2 is the structural schematic diagram of the simulation analysis device for the multi-shot bullet impact bulletproof composite structure provided by the application.

[0018] Figure 3 is the structural schematic diagram of the electronic device provided by the application. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0020] The simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the present application will be described below in conjunction with Figure 1 The simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the present application will be described below in conjunction with

[0021] Figure 1 The simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the present application will be described below in conjunction with Figure 1 The simulation analysis method of the multi-projectile shooting bulletproof composite structure provided by the present application will be described below in conjunction with Step 101, determining the first fluid particle model corresponding to the bullet, the second fluid particle model corresponding to the bulletproof composite structure and the buffer layer finite element model corresponding to the bulletproof composite structure.

[0022] Here, the bulletproof composite structure includes but is not limited to ceramic bulletproof insert plate, steel bulletproof insert plate, titanium alloy bulletproof insert plate, etc.

[0023] Here, the buffer layer can be Ultra-High Molecular Weight Polyethylene Fiber (PE) or aramid fiber material.

[0024] It should be noted that the bullet can include any type, such as 7.62mm armor-piercing incendiary bullet, 12.7mm armor-piercing incendiary bullet.

[0025] Here, the method for determining the first fluid particle model and the second fluid particle model can be any suitable method, such as establishing a bullet finite element model, a finite element model corresponding to the bulletproof composite structure, a finite element model, which refers to the discretization of a continuum into a collection of finite-sized unit bodies to solve continuum mechanics problems, the bulletproof composite structure includes material layer structure and buffer layer structure, and the established finite element model of the bulletproof composite structure includes material finite element model and buffer layer finite element model. The bullet finite element model is converted into the first fluid particle model by software, and the material finite element model is converted into the second fluid particle model. The fluid particle density in the first fluid particle model and the second fluid particle model is the same.

[0026] It should be noted that the establishment of the bullet finite element model also includes various incident angles, velocities and other parameters of the bullet.

[0027] It should be noted that in the smoothed particle hydrodynamics method, a continuous fluid or solid is described by a group of interacting particles, each particle carries various physical quantities including mass, velocity, etc., and the mechanical behavior of the whole system is obtained by solving the dynamic equations of the particle group and tracking the motion trajectory of each particle. The fluid particles are particles, and a plurality of fluid particles form a particle group.

[0028] Step 102, define the material model constitutive equation parameters corresponding to the first fluid particle model, the second fluid particle model and the buffer layer finite element model respectively.

[0029] It should be noted that the material model constitutive equation parameters corresponding to the first fluid particle model are essentially bullet material model constitutive equation parameters, such as constitutive equation (Johnson-Cook, JC); the material model constitutive equation parameters corresponding to the second fluid particle model are essentially bulletproof composite material model constitutive equation parameters, such as constitutive equation (Holmquist-Johnson-Cook, JHC), and the material model constitutive equation parameters corresponding to the buffer layer finite element model are essentially buffer layer material model constitutive equation parameters, such as constitutive equation (composite_damage).

[0030] It should be noted that the material model constitutive equation parameters can include density, shear modulus, fracture normalized strength parameter, tensile strength and other parameters, the material model constitutive equation parameters of the buffer layer finite element model can include density, Young's modulus, shear modulus and other parameters, and the material model constitutive equation parameters of the impact unit fluid particle model can include density, shear modulus, Young's modulus, Poisson's ratio and other parameters. The above parameters can be directly called initial values and determined after debugging, or determined after multiple test tests.

[0031] Step 103, define the connection relationship and contact algorithm between the second fluid particle model and the buffer layer finite element model.

[0032] Here, after establishing the connection relationship, other parameters such as tensile strength parameters and shear strength parameters can be further set to simulate and control the delamination phenomenon.

[0033] The first fluid particle model and the second fluid particle model are both particle models, so particle contact calculation can be directly performed between the particle models. After contact calculation between the buffer layer finite element model and the first fluid particle model, the simulation effect of the first fluid particle and the second fluid particle impacting multiple sub-buffer layers in the buffer layer finite element model layer by layer can be realized, so as to reproduce the hierarchical impact phenomenon of impact unit fragments and anti-impact layer fragments on the buffer layer in the test, and analyze the damage of the impact unit and the anti-impact layer fragments to each layer in the buffer layer. After contact calculation between the sub-buffer layers in the buffer layer finite element model, the phenomena such as fracture, indentation, and delamination failure of the sub-buffer layers under the action of impact force can be simulated.

[0034] For example, the connection relationship includes a first connection relationship and a second connection relationship, the contact algorithm includes a first contact algorithm, a second contact algorithm and a third contact algorithm, and the definition of the connection relationship and the contact algorithm between the second fluid particle model and the buffer layer finite element model includes: establishing the first connection relationship between the second fluid particle model and the buffer layer finite element model by using a point-surface contact mode; establishing the second connection relationship between the sub-buffer layers in the buffer layer finite element model by using a surface delamination failure mode; and defining the first contact algorithm between the first fluid particle model and the second fluid particle model, the second contact algorithm between the first fluid particle model and the buffer layer finite element model, and the third contact algorithm between the sub-buffer layers in the buffer layer finite element model, respectively.

[0035] It should be noted that the second fluid particle model and the buffer layer finite element model are a relationship between a particle model and a solid structure model, so a point-surface contact mode is used to establish the connection to simulate the impact phenomenon of particles on the buffer layer. The sub-buffer layers in the buffer layer finite element model are a relationship between surface and surface models, so a surface delamination failure mode is used to establish the connection to simulate phenomena such as fracture, indentation, and delamination failure of the sub-buffer layers in the buffer layer.

[0036] Here, the first contact algorithm is a self-contact algorithm, the second contact algorithm is an erosion contact algorithm, and the third contact algorithm is a self-contact algorithm. The second fluid particle model and the first fluid particle model belong to particle models, so a self-contact algorithm can be used for calculation to improve the calculation efficiency. The buffer layer finite element model uses a self-contact algorithm to reproduce phenomena such as deformation, indentation, and delamination failure of the buffer layer after being impacted. The buffer layer finite element model and the first fluid particle model use an erosion contact algorithm for calculation, which can reproduce the multi-level impact effect of the impact unit on the buffer layer.

[0037] It should be noted that the connection between the sub-buffer layers in the buffer layer finite element model can be achieved by laying angles and laying directions.

[0038] Exemplarily, the interlayer contact of the buffer layer is established by the contact mode of contact_automatic_surface_to_surface_tiebreak, and the delamination failure of the PE plate is simulated.

[0039] In step 104, a start time of firing of a first bullet and a constraint time length of the bullet speed are defined, and shooting data corresponding to each bullet is obtained.

[0040] Here, the start time refers to the firing time of the bullet, and the constraint time length of the bullet speed refers to the time length of the bullet speed. The constraint time length can be any suitable time length, such as 0.1 microseconds, 0.09 microseconds, etc.

[0041] Here, the shooting data includes the start time of each bullet and the constraint stop time of each bullet.

[0042] Exemplarily, the definition of the start time of the firing of the first bullet and the constraint time length of the bullet speed in the multi-bullet includes: determining a first constraint stop time of the first bullet based on the first start time and the constraint time length of the bullet speed; determining a second start time and a second constraint stop time of each second bullet firing based on the first start time, the first constraint stop time, the bullet firing interval and the bullet speed constraint time length; and determining the bullet speed, the first start time and the first constraint stop time of the first bullet firing, and the second start time and the second constraint stop time of each second bullet firing as the shooting data corresponding to each bullet.

[0043] In the embodiment of the application, by setting the multi-bullet firing sequence, the deviation between the simulation analysis result of the ballistic composite structure and the actual result is reduced, and the accuracy of the performance judgment of the ballistic composite structure is further improved.

[0044] In step 105, based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship and the shooting data, the impact process between each bullet and the ballistic composite structure is simulated to obtain a simulation analysis result.

[0045] The simulation analysis result is used to determine the performance of the ballistic composite structure.

[0046] Here, the simulation analysis results include but are not limited to the fragmentation deformation diagram of the bulletproof composite structure, the first stress damage cloud diagram of the bulletproof composite structure and the crushing cone shape cloud diagram of the bulletproof composite structure, the fragmentation deformation cloud diagram and kinetic energy attenuation curve of each bullet, the deformation diagram in the buffer layer finite element model, the layering information between the sub-buffer layers in the buffer layer finite element model, the second stress damage cloud diagram of the buffer layer finite element model and the back bulge information of the buffer layer finite element model.

[0047] Exemplarily, the method of simulating the impact process between each of the bullets and the bullet-proof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship and the shooting data to obtain a simulation analysis result includes: simulating the impact process between each of the bullets and the bullet-proof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the contact algorithm, the connection relationship and the shooting data to obtain an impact simulation result; and analyzing the bullet-proof composite structure in the impact simulation result. The composite structure is analyzed to obtain a fragmentation deformation diagram of the bullet-proof composite structure, a first stress damage cloud diagram of the bullet-proof composite structure, a stress-time curve of the bullet-proof composite structure, and a crushing cone shape cloud diagram of the bullet-proof composite structure; each of the bullets in the impact simulation results is analyzed to obtain a fragmentation deformation cloud diagram and a kinetic energy attenuation curve of each bullet; the buffer layer finite element model in the impact simulation results is analyzed to obtain a deformation diagram in the buffer layer finite element model, stratification information between sub-buffer layers in the buffer layer finite element model, a second damage cloud diagram of the buffer layer finite element model, and back bulge information of the buffer layer finite element model.

[0048] In an embodiment of the present invention, the impact process between each bullet and the bulletproof composite structure is simulated based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the contact algorithm, the connection relationship and the shooting data, and the impact phenomenon between the impact unit and the bulletproof composite structure is accurately reproduced, thereby improving the accuracy of the bulletproof simulation analysis results.

[0049] In an embodiment of the present invention, a first fluid particle model corresponding to the bullet, a second fluid particle model corresponding to the bullet-proof composite structure, and a finite element model of a buffer layer corresponding to the bullet-proof composite structure are determined; constitutive equation parameters of the material models corresponding to the first fluid particle model, the second fluid particle model, and the finite element model of the buffer layer are defined; a connection relationship and a contact algorithm between the second fluid particle model and the finite element model of the buffer layer are defined; the bullet velocity and the first starting moment of the firing of the first bullet in multiple bullets and the constraint duration of the bullet velocity are defined to obtain shooting data corresponding to each bullet; based on the first fluid particle model, the second fluid particle model, the finite element model of the buffer layer, the constitutive equation parameters of the material model, the contact algorithm, the connection relationship, and the shooting data, the impact process between each bullet and the bullet-proof composite structure is simulated to obtain simulation analysis results; the simulation analysis results are used to determine the performance of the bullet-proof composite structure. In this way, based on the combination of smoothed particle fluid dynamics and the finite element method, the bullet velocity and the shooting time data of each bullet are defined, and the shooting process of multiple bullets on the bullet-proof composite material is simulated. During the simulation process, the actual factors of the material performance degradation and residual stress accumulation effect of the bullet-proof composite structure under the impact of the previous bullet are taken into account, which reduces the deviation between the simulation analysis results and the actual results of the bullet-proof composite structure, and further improves the accuracy of the performance judgment of the bullet-proof composite structure.

[0050] In one embodiment, the performance includes a threshold value of the number of multiple bullets that the bullet-proof composite structure can withstand, and the simulation analysis results include a damage cloud map of the bullet-proof composite structure and a stress-time curve of the bullet-proof composite structure. After obtaining the simulation analysis results, the method further includes: evaluating the threshold value of the number of multiple bullets that the bullet-proof composite structure can withstand based on the damage cloud map of the bullet-proof composite structure and the stress-time curve of the bullet-proof composite structure.

[0051] Here, the quantity threshold refers to the minimum number of bullets that can penetrate the bullet-proof composite structure. The method for evaluating the quantity threshold of the bullet-proof composite structure to withstand multiple bullets can be any appropriate method, for example, directly obtained from the damage cloud map and the stress-time history curve, for example, obtained by analyzing the damage cloud map and the stress-time history curve through analysis software.

[0052] In the embodiment of the present invention, the quantitative threshold is evaluated by using the damage cloud map of the bullet-proof composite structure and the stress-time curve of the bullet-proof composite structure, combined with the material performance degradation and residual stress inheritance mechanism of the bullet after each shooting, thereby reducing the deviation between simulation and reality and further improving the accuracy of the performance judgment of the bullet-proof composite structure.

[0053] In another embodiment, the performance includes a target thickness ratio of the material layer and the buffer layer in the ballistic composite structure, after the simulation analysis result is obtained, the method further includes: determining a target simulation analysis result corresponding to a first thickness ratio of the material layer and the buffer layer in the ballistic composite structure; in a case where the simulation analysis result meets the target simulation analysis result, reducing the first thickness ratio to obtain a second thickness ratio; based on the second thickness ratio, simulating an impact process between each bullet and the ballistic composite structure corresponding to the second thickness ratio to obtain a second simulation analysis result corresponding to the second thickness ratio; based on a comparison result of the second simulation analysis result and the target simulation analysis result, continuously adjusting the second thickness ratio until a simulation analysis result corresponding to an adjusted thickness ratio does not meet the target simulation analysis result, and determining a last thickness ratio of the adjusted thickness ratio as the target thickness ratio of the material layer and the buffer layer.

[0054] It should be noted that the ballistic composite structure includes the material layer and the buffer layer, and the material layer includes but is not limited to ceramic, steel, titanium alloy, etc.

[0055] In the embodiment of the application, by continuously comparing the actual simulation analysis result and the target simulation analysis result, the thickness ratio of the material layer and the buffer layer is reduced within a certain range, and the lightweight of the ballistic composite structure is realized.

[0056] In another embodiment of the application, the parameterized script is used to batch generate simulation working conditions of different bullet speeds, incident angles and bullet sequences by using the bullet-target multi-scale material model, and the multi-bullet penetration threshold and the target thickness ratio of the material layer and the buffer layer corresponding to different working conditions are obtained.

[0057] The following is an application scenario of the simulation analysis method for multi-bullet shooting of the ballistic composite structure provided by the application.

[0058] Assuming that the ballistic composite structure is ceramic, i.e., the material layer described above, and PE, i.e., the buffer layer described above, the simulation analysis method of the multi-bullet shooting ballistic composite structure includes: (1) establishing a finite element model of the ballistic composite structure and a finite element model of the bullet; (2) converting the finite element model of the bullet into a first fluid particle model, and converting the finite element model of the ballistic composite structure into a second fluid particle model; (3) establishing a connection relationship between the second fluid particle model and the finite element model of the buffer layer, and establishing a connection relationship between the sub-buffer layers in the finite element model of the buffer layer; (4) defining a first contact algorithm between the second fluid particle model and the first fluid particle model, defining a second contact algorithm between the finite element model of the buffer layer and the first fluid particle model, and defining a third contact algorithm between the sub-buffer layers in the finite element model of the buffer layer; (4) defining the material model constitutive equation parameters of the second fluid particle model, the finite element model of the buffer layer and the first fluid particle model respectively; (5) defining the multi-bullet shooting sequence, i.e., the shooting data, for example, by setting the bullet firing speed through the *BOUNDARY_PRESCRIBED_MOTION_SET setting command, wherein the first bullet is set to start firing at 0 microseconds and stop firing at 0.1 microseconds; the second bullet starts firing at 200 microseconds and stops firing at 200.1 microseconds; the third bullet starts firing at 400 microseconds and stops firing at 400.1 microseconds. (6) inputting the first fluid particle model, the second fluid particle model, the finite element model of the buffer layer, the material model constitutive equation parameters, the contact algorithm, the connection relationship and the shooting data into the simulation software, simulating the impact process between each bullet and the ballistic composite structure, and obtaining the simulation analysis result; (7) determining the number threshold of the multi-bullet impact on the ballistic composite structure and the target thickness ratio of the material layer and the buffer layer based on the simulation analysis result.

[0059] In the embodiment of the present application, the high-precision simulation problem of material performance degradation under multi-bullet impact is solved, the research and development cycle of ballistic equipment is shortened, and the protection efficiency prediction of multi-scene ballistic threat is supported to provide reliable data support for military / police ballistic equipment design.

[0060] The simulation analysis device for multi-bullet shooting ballistic composite structure provided by the present application is described below, and the simulation analysis device for multi-bullet shooting ballistic composite structure described below can be correspondingly referred to the simulation analysis method for multi-bullet shooting ballistic composite structure described above.

[0061] Figure 2 is a structural schematic diagram of the simulation analysis device for multi-bullet shooting ballistic composite structure provided by the present application, as Figure 2 shown, the simulation analysis device for multi-bullet shooting ballistic composite structure 200 includes: The model determining module 210 is configured to determine a first fluid particle model corresponding to a bullet, a second fluid particle model corresponding to a bulletproof composite structure, and a buffer layer finite element model corresponding to the bulletproof composite structure. The first defining module 220 is configured to define material model constitutive equation parameters corresponding to the first fluid particle model, the second fluid particle model, and the buffer layer finite element model. The second defining module 230 is configured to define a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model. The third defining module 240 is configured to define a bullet speed, a first start time of a first bullet in a multi-bullet shot, and a constraint time length of the bullet speed, to obtain shooting data corresponding to each bullet. The simulation module 250 is configured to simulate an impact process between each bullet and the bulletproof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, to obtain a simulation analysis result. The simulation analysis result is used to determine the performance of the bulletproof composite structure.

[0062] In another embodiment, the simulation analysis result includes a fragmentation deformation map of the bulletproof composite structure, a first stress damage cloud map of the bulletproof composite structure, a stress time history curve of the bulletproof composite structure, and a broken cone shape cloud map of the bulletproof composite structure, a broken deformation cloud map and a kinetic energy decay curve of each bullet, a deformation map in the buffer layer finite element model, delamination information between sub-buffer layers in the buffer layer finite element model, a second stress damage cloud map of the buffer layer finite element model, and back bulge information of the buffer layer finite element model. The simulation module 250 is specifically configured to simulate the impact process between each bullet and the bulletproof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the contact algorithm, the connection relationship, and the shooting data, to obtain an impact simulation result. The bulletproof composite structure in the impact simulation result is analyzed to obtain the fragmentation deformation map of the bulletproof composite structure, the first stress damage cloud map of the bulletproof composite structure, the stress time history curve of the bulletproof composite structure, and the broken cone shape cloud map of the bulletproof composite structure. Each bullet in the impact simulation result is analyzed to obtain the broken deformation cloud map and the kinetic energy decay curve of each bullet. The buffer layer finite element model in the impact simulation result is analyzed to obtain the deformation map in the buffer layer finite element model, the delamination information between the sub-buffer layers in the buffer layer finite element model, the second damage cloud map of the buffer layer finite element model, and the back bulge information of the buffer layer finite element model.

[0063] In another embodiment, the performance includes a number threshold of multiple bullets that the ballistic composite structure can withstand, and the simulation analysis device 200 for multiple bullets shooting against the ballistic composite structure further includes a first evaluation module, specifically configured to: based on the damage cloud atlas of the ballistic composite structure and the stress time history curve of the ballistic composite structure, evaluate the number threshold of multiple bullets that the ballistic composite structure can withstand.

[0064] In another embodiment, the performance includes a target thickness ratio of the material layer and the buffer layer in the ballistic composite structure, and the simulation analysis device 200 for multiple bullets shooting against the ballistic composite structure further includes a second evaluation module, specifically configured to: determine a target simulation analysis result corresponding to a first thickness ratio of the material layer and the buffer layer in the ballistic composite structure; in a case where the simulation analysis result meets the target simulation analysis result, reduce the first thickness ratio to obtain a second thickness ratio; based on the second thickness ratio, simulate an impact process between each bullet and the ballistic composite structure corresponding to the second thickness ratio to obtain a second simulation analysis result corresponding to the second thickness ratio; based on a comparison result of the second simulation analysis result and the target simulation analysis result, continuously adjust the second thickness ratio until a simulation analysis result corresponding to an adjusted thickness ratio does not meet the target simulation analysis result, and determine a last thickness ratio of the adjusted thickness ratio as the target thickness ratio of the material layer and the buffer layer.

[0065] In another embodiment, the third definition module 240 is specifically configured to: based on the first start time and the constraint time length of the bullet speed, determine a first constraint stop time of the first bullet; based on the first start time, the first constraint stop time, the bullet firing interval and the bullet speed constraint time length, determine a second start time and a second constraint stop time of each second bullet firing; and determine the bullet speed, the first start time and the first constraint stop time of the first bullet firing, and the second start time and the second constraint stop time of each second bullet firing as the shooting data corresponding to each bullet.

[0066] In another embodiment, the second definition module 230 is specifically configured to: establish a first connection relationship between the second fluid particle model and the buffer layer finite element model in a point-surface contact mode; establish a second connection relationship between sub-buffer layers in the buffer layer finite element model in a surface layer failure mode; and define a first contact algorithm between the first fluid particle model and the second fluid particle model, a second contact algorithm between the first fluid particle model and the buffer layer finite element model, and a third contact algorithm between sub-buffer layers in the buffer layer finite element model, respectively.

[0067] Figure 3Schematic diagram of the structure of the electronic device provided by the present invention, such as Figure 3 As shown, the electronic device may include: a processor 310 , a communications interface 320 , a memory 330 and a communication bus 340 , wherein the processor 310 , the communications interface 320 and the memory 330 communicate with each other via the communication bus 340 . The processor 310 can call the logic instructions in the memory 330 to execute a simulation analysis method for a bullet-proof composite structure shot by multiple bullets, the method including: determining a first fluid particle model corresponding to the bullet, a second fluid particle model corresponding to the bullet-proof composite structure, and a buffer layer finite element model corresponding to the bullet-proof composite structure; defining the constitutive equation parameters of the material model corresponding to the first fluid particle model, the second fluid particle model, and the buffer layer finite element model respectively; defining the connection relationship and contact algorithm between the second fluid particle model and the buffer layer finite element model; defining the bullet speed and the first starting moment of the firing of the first bullet in multiple bullets and the constraint duration of the bullet speed, and obtaining shooting data corresponding to each of the bullets; based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, simulating the impact process between each of the bullets and the bullet-proof composite structure to obtain a simulation analysis result; the simulation analysis result is used to determine the performance of the bullet-proof composite structure.

[0068] Furthermore, the logic instructions in the aforementioned memory 330 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a mobile hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0069] In another aspect, the present application also provides a computer program product, which comprises a computer program, the computer program being stored in a non-transitory computer readable storage medium, and the computer program being executable by a processor to enable a computer to perform the simulation analysis method for a multi-shot bullet impact bulletproof composite structure, the method comprising: determining a first fluid particle model corresponding to a bullet, a second fluid particle model corresponding to a bulletproof composite structure, and a buffer layer finite element model corresponding to the bulletproof composite structure; defining material model constitutive equation parameters corresponding to each of the first fluid particle model, the second fluid particle model, and the buffer layer finite element model; defining a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model; defining a bullet speed, a first start time of a first bullet in a multi-shot bullet, and a constraint time length of the bullet speed to obtain shooting data corresponding to each bullet; based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, simulating an impact process between each bullet and the bulletproof composite structure to obtain a simulation analysis result; and the simulation analysis result is used to determine a performance of the bulletproof composite structure.

[0070] In yet another aspect, the present application also provides a non-transitory computer readable storage medium having a computer program stored thereon, the computer program being executable by a processor to implement a simulation analysis method for a multi-shot bullet impact bulletproof composite structure, the method comprising: determining a first fluid particle model corresponding to a bullet, a second fluid particle model corresponding to a bulletproof composite structure, and a buffer layer finite element model corresponding to the bulletproof composite structure; defining material model constitutive equation parameters corresponding to each of the first fluid particle model, the second fluid particle model, and the buffer layer finite element model; defining a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model; defining a bullet speed, a first start time of a first bullet in a multi-shot bullet, and a constraint time length of the bullet speed to obtain shooting data corresponding to each bullet; based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, simulating an impact process between each bullet and the bulletproof composite structure to obtain a simulation analysis result; and the simulation analysis result is used to determine a performance of the bulletproof composite structure.

[0071] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0072] Through the description of the above embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A simulation analysis method for a bulletproof composite structure subjected to multiple rounds of fire, characterized in that: include: Determining a first fluid particle model corresponding to the bullet, a second fluid particle model corresponding to the bullet-proof composite structure, and a finite element model of a buffer layer corresponding to the bullet-proof composite structure; defining constitutive equation parameters of material models corresponding to the first fluid particle model, the second fluid particle model, and the buffer layer finite element model; defining a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model; Defining the bullet velocity and the first starting moment of firing of the first bullet in a multi-shot projectile and the constraint duration of the bullet velocity, and obtaining shooting data corresponding to each of the bullets; Based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship and the shooting data, the impact process between each bullet and the bullet-proof composite structure is simulated to obtain simulation analysis results; the simulation analysis results are used to determine the performance of the bullet-proof composite structure.

2. The simulation analysis method for a multi-bullet shooting bulletproof composite structure according to claim 1, characterized in that: The simulation analysis results include a fragmentation deformation diagram of the bullet-proof composite structure, a first stress damage cloud diagram of the bullet-proof composite structure, a stress-time curve of the bullet-proof composite structure, and a crushing cone shape cloud diagram of the bullet-proof composite structure, a fragmentation deformation cloud diagram and a kinetic energy attenuation curve of each bullet, a deformation diagram in a finite element model of the buffer layer, delamination information between sub-buffer layers in the finite element model of the buffer layer, a second stress damage cloud diagram of the finite element model of the buffer layer, and back bulge information of the finite element model of the buffer layer; The method further comprises simulating the impact process between each of the bullets and the bullet-proof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship, and the shooting data, to obtain simulation analysis results, including: simulating the impact process between each of the bullets and the bullet-proof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the contact algorithm, the connection relationship, and the shooting data to obtain an impact simulation result; Analyzing the bulletproof composite structure in the impact simulation results to obtain a fragmentation deformation diagram of the bulletproof composite structure, a first stress damage cloud diagram of the bulletproof composite structure, a stress time history curve of the bulletproof composite structure, and a crushing cone shape cloud diagram of the bulletproof composite structure; Analyzing each of the bullets in the impact simulation results to obtain a fragmentation deformation cloud map and a kinetic energy attenuation curve of each of the bullets; The buffer layer finite element model in the impact simulation results is analyzed to obtain the deformation diagram of the buffer layer finite element model, the stratification information between the sub-buffer layers in the buffer layer finite element model, the second damage cloud map of the buffer layer finite element model and the back bulge information of the buffer layer finite element model.

3. The simulation analysis method for a multi-bullet shooting bulletproof composite structure according to claim 1, characterized in that: The performance includes a threshold value of the number of multiple bullets that the bullet-proof composite structure withstands, and the simulation analysis results include a damage cloud map of the bullet-proof composite structure and a stress-time curve of the bullet-proof composite structure. After obtaining the simulation analysis results, the method further includes: Based on the damage cloud map of the bullet-proof composite structure and the stress-time curve of the bullet-proof composite structure, a threshold value of the number of multiple bullets that the bullet-proof composite structure can withstand is evaluated.

4. The simulation analysis method for a multi-bullet shooting bulletproof composite structure according to claim 2, characterized in that: The performance includes a target thickness ratio of a material layer and a buffer layer in the bullet-proof composite structure. After obtaining the simulation analysis results, the method further includes: Determining a target simulation analysis result corresponding to a first thickness ratio of the material layer and the buffer layer in the bullet-proof composite structure; When the simulation analysis result meets the target simulation analysis result, reducing the first thickness ratio to obtain a second thickness ratio; Based on the second thickness ratio, simulating an impact process between each of the bullets and the bullet-proof composite structure corresponding to the second thickness ratio, to obtain a second simulation analysis result corresponding to the second thickness ratio; Based on the comparison result of the second simulation analysis result and the target simulation analysis result, the second thickness ratio is continuously adjusted until the simulation analysis result corresponding to the adjusted thickness ratio does not meet the target simulation analysis result, and the previous thickness ratio of the adjusted thickness ratio is determined as the target thickness ratio of the material layer and the buffer layer.

5. The simulation analysis method for a multi-bullet shooting bulletproof composite structure according to any one of claims 1 to 4, characterized in that: The step of defining the bullet velocity, the first starting moment of firing of the first bullet in the multi-shot bullet, and the constraint duration of the bullet velocity, and obtaining the shooting data corresponding to each bullet, includes: determining a first constrained stopping time of the first bullet based on the first starting time and the constrained duration of the bullet speed; Determining a second start time and a second constraint stop time for each second bullet firing based on the first start time, the first constraint stop time, the bullet firing interval, and the bullet speed constraint duration; The bullet speed, the first start time and the first constraint stop time of the first bullet firing, and the second start time and the second constraint stop time of each second bullet firing are determined as the shooting data corresponding to each bullet.

6. The simulation analysis method for a multi-bullet shooting bulletproof composite structure according to any one of claims 1 to 4, characterized in that: The connection relationship includes a first connection relationship and a second connection relationship, the contact algorithm includes a first contact algorithm, a second contact algorithm, and a third contact algorithm, and the definition of the connection relationship and the contact algorithm between the second fluid particle model and the buffer layer finite element model includes: Establishing a first connection relationship between the second fluid particle model and the buffer layer finite element model by using a point-surface contact method; Establishing a second connection relationship between sub-buffer layers in the buffer layer finite element model by adopting a surface delamination failure mode; A first contact algorithm between the first fluid particle model and the second fluid particle model, a second contact algorithm between the first fluid particle model and the buffer layer finite element model, and a third contact algorithm between sub-buffer layers in the buffer layer finite element model are defined respectively.

7. A simulation analysis device for a bulletproof composite structure subjected to multiple rounds of fire, characterized in that: include: a model determination module, configured to determine a first fluid particle model corresponding to the bullet, a second fluid particle model corresponding to the bulletproof composite structure, and a finite element model of a buffer layer corresponding to the bulletproof composite structure; A first definition module is used to define constitutive equation parameters of material models corresponding to the first fluid particle model, the second fluid particle model, and the buffer layer finite element model; A second definition module is used to define a connection relationship and a contact algorithm between the second fluid particle model and the buffer layer finite element model; A third definition module is used to define the bullet speed and the first start time of firing of the first bullet in the multi-shot bullet and the constraint time of the bullet speed, and obtain the shooting data corresponding to each bullet; A simulation module is used to simulate the impact process between each of the bullets and the bullet-proof composite structure based on the first fluid particle model, the second fluid particle model, the buffer layer finite element model, the material model constitutive equation parameters, the contact algorithm, the connection relationship and the shooting data, and obtain simulation analysis results; the simulation analysis results are used to determine the performance of the bullet-proof composite structure.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the simulation analysis method for a bullet-proof composite structure shot by multiple bullets as claimed in any one of claims 1 to 6 is implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the simulation analysis method for a bullet-proof composite structure shot by multiple bullets as claimed in any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the simulation analysis method for a bullet-proof composite structure shot by multiple bullets as claimed in any one of claims 1 to 6 is implemented.

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