System and method for measuring maximum deformation of soft bulletproof layer at elastic striking moment

Abstract

The invention discloses a system and a method for measuring the maximum deformation of a soft bulletproof layer at the elastic striking moment, and belongs to the field of end point ballistic experiments. Regional traversal is carried out on coordinate points of a graphic file, pits formed in a backing material after a bulletproof layer is bulletproof are recognized according to changes before and after the backing material is bulletproof, whether the bulletproof point is penetrated or not is judged according to the shape of the bottom of the pits, coordinates of the point with the maximum depth of the pits correspond to coordinate points of a shape file before deformation, and the shape file with the maximum depth is obtained. And the maximum deformation value is obtained through comparison before and after, so that subjective errors caused by manual point selection are avoided, and the change of the surface shape of the backing material caused by downward pressure during manual measurement is avoided. Besides, a computer vision system is introduced into the traditional bulletproof test field, unified calibration analysis of two groups of different images in different time and space is realized, the limitation of a traditional physical measurement method and human subjective factors on precision improvement is eliminated, and especially for a multi-shot bullet test, the pit depth measurement speed is also greatly improved.

Description

Technical Field

[0001] The present invention belongs to the field of terminal ballistics experiments, and particularly relates to a system and method for measuring the maximum deformation of a soft bulletproof layer at the moment of bullet impact. Background Technique

[0002] A bulletproof vest is a protective device used to prevent fragments or projectiles from penetrating and effectively protect the important parts of the human torso. During the bullet impact process, the soft bulletproof layer or hard bulletproof insert plate inside the bulletproof vest will undergo penetration or deformation. When the bulletproof vest is penetrated, it will directly threaten the life safety of the wearer. Even if it is not penetrated, if the deformation is large, it will also cause relatively serious non-penetrating injuries to the personnel and endanger the safety of important organs of the body.

[0003] Currently, the commonly used bulletproof insert plates are composed of bulletproof ceramics and composite material laminates, and the soft bulletproof layer inside the bulletproof vest is made of high-performance fiber cloth laminated and supplemented with edge quilting. There are differences in the bulletproof mechanisms of the two, so the response modes when being bullet-impacted are slightly different. For the insert plate, its bulletproof mechanism is that the high-compressive-strength ceramics on the bullet-facing surface cut and abrade the projectile, and the fiber fracture and interlayer debonding deformation phenomena of the single-sided composite material laminate on its back absorb the energy of the projectile fragments; for the soft bulletproof layer, its bulletproof mechanism is that the fiber fracture phenomenon in the high-performance fiber cloth absorbs the energy of the projectile. Therefore, whether it is a hard insert plate or a soft bulletproof layer, there will be a phenomenon of deformation on the back bullet surface during the projectile penetration process. When the kinetic energy of the projectile invading the bulletproof layer decreases to zero, the maximum deformation that appears on the back bullet surface of the bulletproof layer is called the maximum instantaneous deformation. Since the back bullet surface of the bulletproof layer is the body-facing surface, the size of the maximum instantaneous deformation value is an important parameter for evaluating the anti-bullet performance of the bulletproof layer and is a key technical index for the performance assessment of bulletproof layer equipment.

[0004] The method to characterize the maximum instantaneous deformation of the bulletproof layer is to fit the backing material simulating the human body behind the bulletproof layer during the bullet impact test. The relevant regulations on the backing material are given in "GJB 4300A-2012 Technical Performance Requirements for Safety of Military Bulletproof Vests" and "GA141-2010 Police Bulletproof Vests" and define the maximum deformation depth of the backing material that indirectly reflects the maximum instantaneous deformation, but it does not stipulate the measurement method of the maximum deformation depth of the backing material. According to practical experience, the edge of the pit formed by the backing material after the bulletproof layer is hit by a bullet will form a bulge. This phenomenon has caused great difficulties in measuring the maximum depth of the pit using physical methods. The currently feasible method is to use a pallet to stand at both ends of the pit, pass the pallet through the maximum depth point of the pit, use a vernier caliper to measure the depth value of the maximum depth point, and then use a vernier caliper to measure the height of the bulge at the edge of the pit. The difference between the two is the maximum depth of the pit. However, this measurement method will have a large amount of subjective factors in the process of placing the card plate and selecting the measuring points. For multi-curved bulletproof inserts, the backing material also needs to be trimmed into a multi-curved arc to ensure that it fits the insert plate. When measuring the maximum depth of the pit, more stringent requirements are placed on the placement of the card plate and the selection of the measuring points.

[0005] According to the definition of the maximum depth of the pit in the above two standards, the most ideal testing method is to directly compare the backing materials before and after the impact, that is, to directly compare the pit depth at multiple points based on the original surface of the backing material to obtain the maximum value. However, this measurement method is almost impossible to achieve using traditional physical methods. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a system and method for measuring the maximum deformation of a soft bullet-proof layer at the moment of impact, which can effectively realize the measurement of the maximum deformation of the bullet-proof layer at the moment of impact, ensure the accuracy and reliability of the measurement results, and provide a reliable test technology for measuring the deformation of the bullet-proof layer at the moment of impact.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions: the present invention uses a computer vision system to output the shapes of the surfaces of the backing material before and after being impacted as point cloud geometric data, and uses data processing software to compare and analyze the data of the surfaces of the backing material before and after being impacted to obtain the maximum depth of the pit, thereby directly avoiding the system error caused by manual point selection and achieving the purpose of the present invention.

[0008] The present invention relates to a measurement system for the maximum deformation of a soft bulletproof layer at the moment of bullet impact, which includes a backing material box, a backing material, a data processing terminal, a 3D scanner, a positioning device, and a quick calibration auxiliary card board. The backing material is placed in the backing material box; the quick calibration auxiliary card board is used to quickly calibrate the surface scanning area of the backing material; the positioning device is provided with a reference positioning point, which is used to fix the relative positions of the quick calibration auxiliary card board and the backing material, and perform reference positioning and dimension calibration on the obtained surface shape file; the 3D scanner is used to generate the surface shape data of the backing material; the data processing terminal is used to read the point cloud geometric data scanned and generated by the 3D scanner, process it to generate a surface shape file, identify the bullet impact point pit, process it into a pit image, and store the read data, generated files, and images.

[0009] Preferably, the data processing terminal includes a point cloud geometric data reading module, a surface shape generating module, a surface shape comparison processing and value-taking module, and a storage module; the point cloud geometric data reading module is used to read the data generated by the 3D scanner; the surface shape generating module is used to process the data read by the point cloud geometric data reading module to generate a surface shape file; the surface shape comparison processing and value-taking module is used to identify the bullet impact point pit and process it into a pit image; the storage module is used to store the data, files, and images obtained by the point cloud geometric data reading module, the surface shape generating module, and the surface shape comparison processing and value-taking module.

[0010] Preferably, the surface shape comparison processing and value-taking module includes a comparison and recognition algorithm module and a smoothing algorithm module. The comparison and recognition algorithm module is used to identify the bullet impact point pit, and the smoothing algorithm module is used to process the bullet impact point pit identified by the comparison and recognition algorithm module to obtain a pit image.

[0011] Preferably, the quick calibration auxiliary card board is in a cross shape structure, including two longitudinal slide rails and two transverse slide rails, and a through groove is arranged in the middle of the longitudinal slide rails and the transverse slide rails.

[0012] Preferably, the positioning device is a positioning pin, and its reference positioning point is a marking point arranged on the top surface.

[0013] Preferably, the backing material is attached to the surface of the quick calibration auxiliary card board.

[0014] The present invention also relates to a method for measuring the maximum deformation of a bulletproof layer at the moment of bullet impact by using the bulletproof layer maximum deformation measurement system according to claim 1, and is characterized in that the measurement steps are as follows: Step 1, start the data processing terminal; Step 2, connect the 3D scanner to the data processing terminal to establish communication; Step 3: Place the backing material into the backing material box, trim the backing material according to the shape of the anti-ballistic surface of the anti-ballistic layer to make its surface flat without pits; adjust the quick calibration auxiliary card according to the structural dimensions of the backing material box to calibrate the surface scanning area of the backing material; use the positioning device to fix the relative positions of the quick calibration auxiliary card and the backing material. Step 4: Use a 3D scanner to scan the surface shape of the backing material before impact. The obtained point cloud file is read by the data processing terminal to generate a surface shape file of the backing material before impact; use the reference positioning points of the positioning device to calibrate the dimensions of the generated surface shape file of the backing material before impact; the obtained file is stored in the data processing terminal for backup. Step 5: Fix the anti-ballistic layer on the surface of the backing material and conduct an impact test. Step 6: Remove the anti-ballistic layer after the impact test, use a 3D scanner to scan the surface shape of the backing material after impact. The obtained point cloud file is read by the data processing terminal to generate a surface shape file of the backing material after impact; use the reference positioning points of the positioning device to calibrate the dimensions of the generated surface shape file of the backing material after impact; the obtained file is stored in the data processing terminal for backup. Step 7: According to the reference positioning points, place the two surface shapes before and after impact in coincidence, run the data processing terminal, identify and judge the impact point pits and penetration conditions to obtain the impact point pit areas that need to measure the depth, smooth the cracks at the bottom of the pits, and compare and take values for the points with the maximum depth value of the pits.

[0015] Preferably, the data processing terminal includes a point cloud geometric data reading module, a surface shape generating module, a surface shape comparison processing and value-taking module, and a storage module.

[0016] In Step 4, the point cloud file obtained by the 3D scanner is read by the point cloud geometric data reading module and processed by the surface shape generating module to generate a surface shape file of the backing material before impact; use the reference positioning points of the positioning device to perform reference positioning on the generated surface shape file of the backing material before impact; the obtained file is stored in the storage module for backup. In Step 6, the point cloud file obtained by the 3D scanner is read by the point cloud geometric data reading module and processed by the surface shape generating module to generate a surface shape file of the backing material after impact; use the reference positioning points of the positioning device to perform reference positioning on the generated surface shape file of the backing material after impact; the obtained file is stored in the storage module for backup.

[0017] In Step 7, run the surface shape comparison processing and value-taking module to identify and judge the impact point pits and penetration conditions to obtain the impact point pit areas that need to measure the depth, smooth the cracks at the bottom of the pits, and compare and take values for the points with the maximum depth value of the pits.

[0018] Preferably, the surface shape comparison and processing value-taking module includes a comparison and recognition algorithm module and a smoothing algorithm module; in step 7, the comparison and recognition algorithm module identifies and judges the impact point pits and penetration conditions to obtain the impact point pit area where the depth needs to be measured, the smoothing algorithm module smooths the cracks at the bottom of the pits, and the value-taking algorithm module compares and takes values for the maximum depth value points of the pits.

[0019] Preferably, in step 3, the backing material is flush with the surface of the backing material box, and the quick calibration auxiliary card board fits with the surface of the backing material.

[0020] The present invention adopts the comparison and recognition algorithm in the unique surface shape comparison and processing value-taking module, which can traverse each coordinate point of the graphic file by sub-regions, identify the pits formed on the backing material after the bullet impact on the bulletproof layer according to the changes of the backing material before and after the bullet impact, and judge whether the impact point penetrates or not according to the shape of the bottom of the pit. The coordinates of the maximum depth value point of the pit are used to correspond to the coordinate points of the shape file before deformation, and the maximum deformation is obtained by comparing before and after. The method mentioned in the present invention fundamentally avoids the subjective error caused by manual point selection, and also avoids the change of the surface shape of the backing material caused by the downward pressure during manual measurement. In addition, the present invention introduces the computer vision system into the traditional bulletproof test field, and realizes the unified calibration and analysis of two groups of different images in different time and space with the help of the positioning pin marking points of the auxiliary card board and the comparison and processing value-taking module, getting rid of the limitations of the traditional physical measurement method and the human subjective factors on the improvement of accuracy. For multiple bullet impact tests, the measurement speed of the pit depth will also be greatly improved. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the composition structure of the measurement system of the present invention; Figure 2 It is a data processing flow chart in the data processing terminal; Figure 3 It is a data processing flow chart in the surface shape comparison and processing value-taking module; Figure 4 It is a schematic diagram of the structure of the quick calibration auxiliary card board; Figure 5 It is a curve graph of the measurement data change of the example and the comparative example; Figure 6 It is a comparison graph of the variance data of the measurement data of the example and the comparative example.

[0022] Among them, 1 - data processing terminal, 11 - point cloud geometric data reading module, 12 - surface shape generation module, 13 - surface shape comparison processing value-taking module, 131 - comparison recognition algorithm module, 132 - smoothing algorithm module, 133 - value-taking algorithm module, 14 - storage module, 2 - 3D scanner, 3 - 3D structured light, 4 - positioning pin, 41 - fiducial point, 5 - quick calibration auxiliary card board, 51 - longitudinal slide rail, 52 - transverse slide rail, 6 - backing material box, 7 - backing material. Detailed implementation manners

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Embodiment As Figure 1 shown, the maximum deformation measurement system at the moment of impact of the present invention includes a data processing terminal 1, a handheld non-contact 3D scanner 2, a positioning device, a quick calibration auxiliary card board 5, a backing material box 6 and a backing material 7.

[0025] As Figure 2 shown, the data processing terminal 1 integrates a point cloud geometric data reading module 11, a surface shape generation module 12, a surface shape comparison processing value-taking module 13 and a storage module 14.

[0026] As Figure 3 shown, the surface shape comparison processing value-taking module 13 includes a comparison recognition algorithm module 131 and a smoothing algorithm module 132. When the point cloud geometric data is imported into this module through the surface shape generation module 12, with the fiducial point 41 as the reference point, the two images are overlapped. After the impact point pit is recognized by the comparison recognition algorithm module 131, the pit image is obtained after being processed by the smoothing algorithm module 132, and can be directly used for the value-taking algorithm module 133 to take the depth value of the pit points.

[0027] The positioning device is a positioning pin 4, and four fiducial points 41 are arranged at the center position of the top surface thereof.

[0028] As Figure 4 shown, the quick calibration auxiliary card board 5 has a cross-shaped structure and includes two longitudinal slide rails 51 and two transverse slide rails 52. A through groove is arranged in the middle of the longitudinal slide rail 51 and the transverse slide rail 52, and scale lines are arranged on the edge of the through groove.

[0029] The backing material box 6 is a rectangular box-shaped structure surrounded by metal without an upper cover and is used for containing the backing material 7.

[0030] The backing material 7 is made of clay, and its structural dimensions are the same as the inner cavity of the backing material box 6, and the outer surface is flush with the edge of the backing material box 6 without an upper cover.

[0031] The maximum deformation measurement system of the present invention during the impact instant has four positioning pins 4, which respectively pass through four junction through-holes of the longitudinal slide rail 51 and the transverse slide rail 52 of the quick calibration auxiliary card board 5, and are inserted into four corners of the backing material 7 contained in the backing material box 6. Through the fitting of the longitudinal slide rail 51 and the transverse slide rail 52 with the edge without the upper cover of the backing material box 6, the fitting and fixation of the quick calibration auxiliary card board 5 with the surface of the backing material 7 are realized; the 3D scanner 2 is connected to the data processing terminal 1 by wires.

[0032] When using the maximum deformation measurement system of the present invention during the impact instant to measure the maximum deformation of the bulletproof layer during the impact instant, the following steps are included: Step 1, start the data processing terminal 1 and load each module.

[0033] Step 2, connect the 3D scanner 2 to the data processing terminal 1 to establish communication.

[0034] Step 3, use a rubber hammer to trim the backing material 7 according to the shape of the back bullet surface of the bulletproof layer to make its surface flat without pits. According to the structural dimensions of the backing material box 6, adjust the positions of the positioning pins 4 in the middle barrel grooves of the longitudinal slide rail 51 and the transverse slide rail 52, and then insert the positioning pins 4 into the backing material 7 contained in the backing material box 6 to make the surface of the backing material 7 fit with the surface of the quick calibration auxiliary card board 5.

[0035] Step 4, use the 3D scanner 2 to scan the surface shape of the backing material 7 before the impact, so that the 3D structured light 3 scans the surface details of the backing material 7. The obtained point cloud file is processed by the point cloud geometric data reading module 11 and the surface shape generation module 12 to generate a file of the surface shape of the backing material before the impact. According to the scale positions of the marking points 41 on the positioning pins 4 on the quick calibration auxiliary card board 5, the position information of the four marking points 41 is respectively read, and the file of the surface shape before the impact is dimensionally calibrated according to the position information, and the obtained file is stored in the storage module 14 for standby.

[0036] Step 5, fix the bulletproof layer on the backing material 7 and conduct an impact test. During the test, a total of four impacts are made.

[0037] Step 6, remove the bulletproof layer after the impact test, use the 3D scanner 2 to scan the surface shape of the backing material 7 after the impact, and the obtained point cloud file is processed by the point cloud geometric data reading module 11 and the surface shape generation module 12 to generate a file of the surface shape of the backing material after the impact. The file of the surface shape after the impact is dimensionally calibrated according to the positions of the marking points 41 on the positioning pins 4 on the quick calibration auxiliary card board 5, and the generated file of the surface shape after the impact is stored in the storage module 14 for standby.

[0038] Step 7: Taking the marker point 41 on the surface shape files of the front and back lining materials before and after impact scanned in Step 4 and Step 6 as the reference points, placing the two images in coincidence, running the surface shape comparison and processing value-taking module 13. The comparison and recognition algorithm module 131 identifies and judges the impact point pits and penetration conditions to obtain the impact point pit areas where the depth needs to be measured. The smoothing algorithm module 132 smooths the cracks at the bottom of the pits. The value-taking algorithm module 133 compares and takes values for the maximum depth value points of the pits. Since the surface shape comparison and processing value-taking module 13 performs global processing on the images, all the impact point pit depth values can be obtained simultaneously after the module runs. Each impact point is taken eight times, and the value-taking results are shown in Table 1.

[0039] Table 1 Measurement Results of the Method of the Present Invention

[0040] As can be seen from Table 1, according to the impact instant maximum deformation measurement system and method of the present invention, the variances of the four impact points are 0.016, 0.051, 0.153, and 0.102 respectively.

[0041] Comparative Example The pit depths of the bulletproof layer in the embodiment were measured multiple times using the traditional method of a template plus a caliper, and the test results are shown in Table 2.

[0042] Table 2 Measurement Results of the Traditional Method

[0043] As can be seen from Table 2, according to the traditional method of a template plus a caliper, the variances of the four impact points are 0.3, 0.239, 0.051, 0.191, and 0.227 respectively, which are 18.75 times, 4.69 times, 1.25 times, and 2.23 times that of the test results of the present invention.

[0044] Comparing the variance values of each measurement point between the embodiment and the comparative example, combined with the measurement data change curve Figure 5 and the variance data comparison Figure 6 , it can be seen that the method designed by the present invention for measuring the maximum depth of the pit of the lining material can effectively reduce errors and improve data accuracy.

Claims

1. A measurement system for the maximum deformation of a soft bulletproof layer at the moment of impact, comprising a backing material box and a backing material, the backing material being contained in the backing material box, characterized in that: It also includes a data processing terminal (1), a three-dimensional scanner (2), a positioning device, and a quick calibration auxiliary card board (5); the quick calibration auxiliary card board (5) is used to quickly calibrate the surface scanning area of the backing material (7); the positioning device is provided with a reference positioning point for fixing the relative positions of the quick calibration auxiliary card board (5) and the backing material (7), and performing reference positioning and dimension calibration on the obtained surface shape file; the three-dimensional scanner (2) is used to generate the surface shape data of the backing material (7); the data processing terminal (1) is used to read the point cloud geometric data scanned and generated by the three-dimensional scanner (2), process it to generate a surface shape file, identify the impact point pits, process them into pit images, and store the read data, generated files, and images.

2. The maximum deformation measurement system of a soft bulletproof layer at the moment of impact according to claim 1, characterized in that: The data processing terminal (1) includes a point cloud geometric data reading module (11), a surface shape generating module (12), a surface shape comparison processing and value-taking module (13), and a storage module (14); the point cloud geometric data reading module (11) is used to read the data generated by the three-dimensional scanner (2); the surface shape generating module (12) is used to process the data read by the point cloud geometric data reading module (11) to generate a surface shape file; the surface shape comparison processing and value-taking module (13) is used to identify the impact point pits and process them into pit images; the storage module (14) is used to store the data, files, and images obtained by the point cloud geometric data reading module (11), the surface shape generating module (12), and the surface shape comparison processing and value-taking module (13).

3. The maximum deformation measurement system of the soft bulletproof layer at the moment of bullet impact according to claim 1, characterized in that: The surface shape comparison processing and value-taking module (13) includes a comparison and recognition algorithm module (131) and a smoothing algorithm module (132). The comparison and recognition algorithm module (131) is used to identify the impact point pits, and the smoothing algorithm module (132) is used to process the impact point pits identified by the comparison and recognition algorithm module (131) to obtain a pit image.

4. The maximum deformation measurement system for a soft bulletproof layer at the moment of bullet impact according to claim 1, characterized in that: The quick calibration auxiliary card board (5) has a cross-shaped structure and includes two longitudinal slide rails (51) and two transverse slide rails (52), and a through groove is provided in the middle of the longitudinal slide rails (51) and the transverse slide rails (52).

5. The maximum deformation measurement system for a soft bulletproof layer at the moment of impact according to claim 1, characterized in that: The positioning device is a positioning pin (4), and its reference positioning point is a marking point (41) provided on the top surface.

6. The maximum deformation measurement system of the soft bulletproof layer at the moment of bullet impact according to claim 1, characterized in that: The backing material (7) is attached to the surface of the quick calibration auxiliary card board (5).

7. A method for measuring the maximum deformation at the moment of bullet impact on a bulletproof layer using the maximum deformation measurement system for the bulletproof layer at the moment of bullet impact according to claim 1, characterized in that, The measurement steps are as follows: Step 1, start the data processing terminal (1); Step 2, connect the three-dimensional scanner (2) to the data processing terminal (1) to establish communication; Step 3, place the backing material (7) into the backing material box (6), trim the backing material (7) according to the shape of the back bullet surface of the bulletproof layer to make its surface flat and without pits; according to the structural dimensions of the backing material box (6), adjust the quick calibration auxiliary card board (5) to calibrate the surface scanning area of the backing material (7); use the positioning device to fix the relative positions of the quick calibration auxiliary card board (5) and the backing material (7); Step 4: Use a 3D scanner (2) to scan the surface shape of the backing material (7) before impact. The obtained point cloud file is read by the data processing terminal (1) to generate a file of the surface shape of the backing material before impact. Calibrate the dimensions of the generated file of the surface shape of the backing material before impact using the reference positioning points of the positioning device. The obtained file is stored in the data processing terminal (1) for backup. Step 5: Fix the bulletproof layer on the surface of the backing material (7) and conduct an impact test. Step 6: Remove the bulletproof layer after the impact test. Use a 3D scanner (2) to scan the surface shape of the backing material (7) after impact. The obtained point cloud file is read by the data processing terminal (1) to generate a file of the surface shape of the backing material after impact. Calibrate the dimensions of the generated file of the surface shape of the backing material after impact using the reference positioning points of the positioning device. The obtained file is stored in the data processing terminal (1) for backup. Step 7: According to the reference positioning points, place the two surface shapes before and after impact in coincidence. Run the data processing terminal (1) to identify and judge the impact point pits and penetration conditions to obtain the impact point pit areas where the depth needs to be measured. Smooth the cracks at the bottom of the pits, and compare and obtain values for the points with the maximum depth of the pits.

8. A method for measuring the maximum deformation at the moment of bullet impact on a bulletproof layer using the maximum deformation measurement system at the moment of bullet impact on the bulletproof layer, characterized in that: The data processing terminal (1) includes a point cloud geometric data reading module (11), a surface shape generating module (12), a surface shape comparison processing and value obtaining module (13), and a storage module (14). In Step 4, the point cloud file obtained by the 3D scanner (2) is read by the point cloud geometric data reading module (11) and processed by the surface shape generating module (12) to generate a file of the surface shape of the backing material before impact. Use the reference positioning points of the positioning device to perform reference positioning on the generated file of the surface shape of the backing material before impact. The obtained file is stored in the storage module (14) for backup. In Step 6, the point cloud file obtained by the 3D scanner (2) is read by the point cloud geometric data reading module (11) and processed by the surface shape generating module (12) to generate a file of the surface shape of the backing material after impact. Use the reference positioning points of the positioning device to perform reference positioning on the generated file of the surface shape of the backing material after impact. The obtained file is stored in the storage module (14) for backup. In Step 7, run the surface shape comparison processing and value obtaining module (13) to identify and judge the impact point pits and penetration conditions to obtain the impact point pit areas where the depth needs to be measured. Smooth the cracks at the bottom of the pits, and compare and obtain values for the points with the maximum depth of the pits.

9. A method for measuring the maximum deformation of a bulletproof layer at the moment of bullet impact using a maximum deformation measurement system for a bulletproof layer at the moment of bullet impact, characterized in that: The surface shape comparison processing and value obtaining module (13) includes a comparison and recognition algorithm module (131), a smoothing algorithm module (132), and a value obtaining algorithm module (133). In Step 7, the comparison and recognition algorithm module (131) identifies and judges the impact point pits and penetration conditions to obtain the impact point pit areas where the depth needs to be measured. The smoothing algorithm module (132) smooths the cracks at the bottom of the pits. The value obtaining algorithm module 133 compares and obtains values for the points with the maximum depth of the pits.

10. A method for measuring the maximum deformation at the moment of bullet impact on a bulletproof layer using the maximum deformation measurement system at the moment of bullet impact on the bulletproof layer, characterized in that: In step 3, the backing material (7) is flush with the surface of the backing material box (6), and the quick calibration auxiliary card board (5) is attached to the surface of the backing material (7).

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