An adjustable lance testing device

Abstract

The application discloses an adjustable stab instrument test device, comprising: a stab instrument mechanism arranged above a frame structure, used for adjusting the stab speed and stab angle of the stab instrument; a fixed and loaded main body module, used for fixing a film material test piece and adjusting the pre-tension of the film material test piece; a data acquisition module connected with a computer terminal module, used for acquiring film surface image data during the film material test piece is being punctured and transmitting the film surface image data to the computer terminal module; and the computer terminal module is used for processing the film surface image data, taking the initial picture when the film material test piece is not being punctured as a calibration picture, identifying speckle feature points in the image, and calculating the strain at the film surface by comparing the positions of the speckle feature points in the image data before and after deformation. The application can guarantee the test precision and improve the test efficiency.

Description

Technical Field

[0001] This invention relates to the field of testing technology for the mechanical properties of thin film materials, and in particular to an adjustable puncture test device. Background Technology

[0002] Thin film materials, with their excellent physical and mechanical properties, have been widely used in new building construction, energy, and other fields. In practical engineering applications in building structures, thin film materials are susceptible to puncture and compression by sharp objects, and their puncture resistance is a core indicator for evaluating the engineering suitability of materials.

[0003] Most existing puncture tests use conventional, simple puncture tools. The puncture mechanism is mostly a single standard needle directly connected to a transmission rod, lacking a dedicated guide and limiting component. During the test, manual pressure is applied or the simple puncture rod is directly installed on the moving end of the universal testing machine to complete the puncture operation. Moreover, the entire device lacks a uniform speed control structure, making it impossible to accurately control the puncture rate and the magnitude of the applied force. At the same time, the device as a whole does not integrate sensor acquisition components and multi-directional adjustment structures, and can only complete the basic puncture action, making it difficult to simultaneously collect mechanical parameters and deformation data throughout the process. Therefore, the existing puncture mechanism has obvious technical defects and cannot meet the requirements of high-precision and standardized testing. The specific problems are as follows: (1) The structure is simple and cannot guarantee the stability of the needle puncture direction; (2) The sample is not firmly fixed and is prone to deviation; (3) The loading speed / force is not easy to control, affecting the consistency of the experiment; (4) It is impossible to achieve automated acquisition or multi-dimensional testing. Therefore, there is an urgent need for a puncture testing fixture that can solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide an adjustable puncture test device to stably control the puncture speed and puncture angle of the puncture during the test; and to record and measure the film surface strain of the thin film material specimen in real time through digital image correlation technology, so as to accurately obtain the deformation of the thin film material specimen and its corresponding puncture load throughout the puncture test.

[0005] The technical solution to achieve the purpose of this invention is: an adjustable piercing test device, comprising: a piercing mechanism, a fixing and loading main body module, a data acquisition module, and a computer terminal module;

[0006] The stabbing mechanism, located above the frame structure, is used to adjust the insertion speed and angle of the stabbing tool.

[0007] The fixing and loading main module is used to fix the thin film material specimen and adjust the pretension of the thin film material specimen. The height of the puncture is kept at the same height as the center position of the thin film material specimen. A speckled film is set in the middle area of ​​the thin film material specimen.

[0008] The data acquisition module, connected to the computer terminal module, is used to acquire image data of the film surface during the puncture process of the thin film material specimen and transmit it to the computer terminal module.

[0009] The computer terminal module is used to process membrane surface image data. Using the initial image before puncture as the calibration image, it identifies speckle feature points in the image and calculates the strain at the membrane surface by comparing the positions of the speckle feature points in the image data before and after deformation.

[0010] Furthermore, the adjustable stabbing mechanism includes aluminum alloy profiles, a lead screw mounting platform, a slide rail, a simple platform, a lead screw, a four-jaw chuck, a stabbing blade, a phase-synchronous generator, wires, an electronic driver, and an electronic controller. The aluminum alloy profiles are fixedly connected to form a rigid main frame. A fixed connection is reserved at the top between the phase-synchronous generator and the lead screw mounting platform. The lead screw mounting platform and the phase-synchronous generator are fixed above the main frame structure. A lead screw is rotatably mounted on the lead screw mounting platform, and the output shaft of the phase-synchronous generator is fixedly connected to the lead screw. Rotation of the output shaft of the phase-synchronous generator drives the lead screw to rotate. The simple platform is threadedly engaged with the lead screw and slidably connected to the slide rail. The slide rail is fixedly mounted on the lead screw mounting platform. Rotation of the lead screw drives the simple platform to move linearly along the slide rail. The four-jaw chuck is mounted on the simple platform, and the stabbing blade is mounted on the other side. The electronic driver and electronic controller are connected via wires. The electronic controller changes the horizontal movement speed of the simple platform by changing the rotation speed of the phase-synchronous generator, thereby changing the insertion speed of the stabbing blade.

[0011] Furthermore, a pressure sensor is installed between the four-jaw chuck and the simple platform to detect the force at the tip of the stab.

[0012] Furthermore, the fixing and loading main module includes: the test machine base and the middle movable crossbeam are respectively fixedly connected to both ends of the film testing special flat jaw clamp by insert pins, and the height of the middle movable crossbeam is adjusted so that the film testing special flat jaw clamp clamps and fixes the film material specimen.

[0013] Furthermore, the data acquisition module includes a high-definition camera, a tripod, a shutter connector, and a signal receiver. The high-definition camera is stably placed behind and to the side of the main loading module via the tripod to ensure that the high-definition camera can capture images of the thin film material specimen. The high-definition camera is connected to the signal receiver via the shutter connector to receive the transmitted signal, so as to achieve interval photography during the test and obtain the film surface image data of the thin film material specimen after being pierced by the blade at the corresponding interval time during the test. This ensures the continuity of image data acquisition while reducing the amount of data.

[0014] Furthermore, the experimental method is as follows:

[0015] The first step is to determine the test plan, identify the test variables in the puncture test, select and prepare the thin film material specimen, and attach a speckle film to the middle area of ​​the film surface of the thin film material specimen and calibrate the calibration points.

[0016] The second step is to install the test specimen. Fix both ends of the film material specimen to the clamping end of the special flat jaw clamp for film testing, and make sure that the height of the center area of ​​the film material specimen is consistent with the height of the puncture end to ensure that the film material specimen is held stably during the puncture test and does not slip.

[0017] The third step is to control the insertion speed and angle of the piercing tool. The speed of the phase-synchronous generator is set by the electronic controller to control the horizontal movement speed of the simple platform. A high-definition camera is used to take pictures of the thin film material specimen as the initial calibration photos.

[0018] The fourth step is to record relevant data. After setting the pretension, control the piercing system to simultaneously insert the piercing tool and stop after the piercing tool has completely penetrated the film material. At the same time as the piercing tool penetrates the film material, control the high-definition camera to take synchronous and intermittent photos of the test specimen film surface to accurately record the piercing load and its corresponding image data during the puncture test.

[0019] Compared with the prior art, the significant advantages of this invention are: it improves the stability of the piercing direction; ensures sample fixation and reduces experimental errors; it improves the repeatability and comparability of the test through controllable loading; it offers adjustable height of the piercing device; and it can be expanded to include automated acquisition and control, thereby improving experimental efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a structural diagram of the main framework of the present invention;

[0022] Figure 3 This is a schematic diagram of the adjustable puncture testing device of the present invention;

[0023] Figure 4 This is a schematic diagram of the main module for fixing and loading thin film material specimens according to the present invention;

[0024] Figure 5 This is a schematic diagram of the data acquisition module of the present invention;

[0025] The components include: 1. Barrel mechanism; 2. Fixing and loading main module; 3. Data acquisition module; 4. Computer terminal module; 5. Aluminum alloy profile; 6. Corner fittings; 7. Slide rail platform; 8. Slide rail; 9. T-screw; 10. Simple platform; 11. Lead screw; 12. Force sensor; 13. Four-jaw chuck; 14. Blade barrel; 15. Phase-synchronous generator; 16. Wire; 17. Electronic driver; 18. Electronic controller; 19. Testing machine round hole; 20. Flat jaw clamp for thin film testing; 21. Thin film material specimen; 22. High-definition camera; 23. Tripod; 24. Shutter connector; 25. Signal receiver. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] As attached Figure 1-5 As shown, the present invention provides an adjustable puncture test apparatus suitable for DIC measurement, including an adjustable puncture mechanism 1, a fixing and loading main body module 2 for fixing and loading thin film material specimens, a data acquisition module 3, and a computer terminal module 4.

[0028] The adjustable piercing mechanism 1 includes an aluminum alloy profile 5, corner piece 6, lead screw mounting platform 7, slide rail 8, T-screw 9, simple platform 10, lead screw 11, force sensor 12, four-jaw chuck 13, blade piercing 14, phase-synchronous generator 15, wire 16, electronic actuator 17, and electronic controller 18.

[0029] Specifically, four vertical aluminum alloy profiles 5 and eight horizontal aluminum alloy profiles 5 are assembled into a frame structure through corner fittings 6 to form a vertical rigid main frame; a phase-synchronous generator 15 is reserved at the top for fixed connection with the lead screw mounting platform 7 to ensure that the overall structure is stable and does not shake. The lead screw mounting platform 7 and the phase-synchronous generator 15 are fixed to the main frame structure by T-screws 9. A lead screw 11 is rotatably mounted on the lead screw mounting platform 7. The output shaft of the phase-synchronous generator 15 is fixedly connected to the lead screw 11. When the output shaft of the phase-synchronous generator 15 rotates, it drives the lead screw 11 to rotate. The simple platform 10 is threadedly engaged with the lead screw 11. The simple platform 10 is slidably connected to the slide rail 8. The slide rail 8 is fixedly mounted on the lead screw mounting platform 7. When the lead screw 11 rotates, it drives the simple platform 10 to move linearly along the slide rail 8. A four-jaw chuck 13 is mounted on the simple platform 10, and a pressure sensor 12 is set between the two. The pressure sensor 12 is used to detect the force at the tip of the piercing tool. A blade piercing tool 14 is mounted on the four-jaw chuck 13 to ensure that the piercing tool will not deviate during the test. The four-jaw chuck 13 can quantitatively change the insertion angle of the blade piercing tool 14 to increase the number of test conditions. The electronic driver 17 and the electronic controller 18 are connected by wire 16. The electronic controller 18 can quantitatively change the rotation speed of the phase generator 15, thereby quantitatively changing the horizontal movement speed of the simple platform 10. Thus, the insertion speed of the blade 14 can be changed by controlling the electronic controller 18.

[0030] The fixing and loading main module 2 includes: a testing machine 19, a film testing-specific flat jaw clamp 20, and a film material specimen 21. The base of the testing machine 19 and the middle movable crossbeam in the fixing and loading main module 2 are fixedly connected to both ends of the film testing-specific flat jaw clamp 20 via pins. The film material specimen 21 is placed in the lower end of the film testing-specific flat jaw clamp 20. The height of the middle movable crossbeam is adjusted so that the film testing-specific flat jaw clamps 20 installed at both ends can accurately clamp the film material specimen 21, and the center position of the film material specimen 21 is kept consistent with the height of the blade piercing 14, ensuring that the blade piercing 14 can penetrate the film material specimen 21 from the center.

[0031] The data acquisition module 3 includes a speckle film, a high-definition camera 22, a tripod 23, a shutter connector 24, and a signal receiver 25. The speckle film is applied to a pre-reserved area in the center of the thin film material specimen 21. The high-definition camera 22 is stably positioned behind and fixed to the loading main module 2 via the tripod 23, ensuring that the high-definition camera 22 can clearly capture images of the thin film material specimen 21 and the speckle film pattern, and that the surface of the speckle film is free of reflection and wrinkles. The high-definition camera 22 is connected to the signal receiver 25 via the shutter connector 24 to receive the transmitted signal, enabling interval photography during the experiment. This allows for obtaining image data of the thin film material specimen 21 after being pierced by the blade piercing 14 at corresponding intervals during the experiment, ensuring continuous image data acquisition while reducing the amount of data.

[0032] The computer terminal module is used to process membrane surface image data. Using the initial image before puncture as the calibration image, it identifies speckle feature points in the image and calculates the strain at the membrane surface by comparing the positions of the speckle feature points in the image data before and after deformation.

[0033] The specific test method of the adjustable puncture test device suitable for DIC measurement disclosed in this invention is as follows:

[0034] The first step is to determine the type of membrane material, sample size, target pretension and other parameters according to the test plan. Cut the thin film material specimen 21 according to the standard. Create DIC digital image related speckle in the center and around the needle-punched area of ​​the thin film material specimen 21 to ensure that the image acquisition is clear and there is no reflection.

[0035] The second step involves adjusting the dimensions of the high-definition camera 22 and the fixing and loading main module 2 according to the dimensions of the thin film material specimen 21, ensuring that the installation space meets the requirements for tensioning, needle punching, and DIC imaging of the thin film material specimen 21. The upper and lower sides of the thin film material specimen 21 are fixed in the thin film testing-specific flat jaw clamp 20, and Y-axis tensioning is applied to keep the thin film material specimen 21 flat, wrinkle-free, and without slack.

[0036] The third step involves real-time monitoring of the Y-axis tension. The pretension is precisely adjusted to the test set value by rotating the adjusting screw to ensure the sample is under uniform stress. The pretension is then locked to prevent the thin film material specimen 21 from loosening or slipping during the test.

[0037] Fourth, select blades 14 of different widths according to the test conditions, install them on the simple platform 10 using a four-jaw chuck 13, and lock them in place. Control the system using an electronic controller 18 to set a constant speed loading and complete parameter confirmation.

[0038] Fifth, adjust the height of tripod 23 and the angle and focal length of high-definition camera 22 so that the lens is aimed at the center area of ​​the needle-punched thin film material specimen 21. Turn on the light source to eliminate shadows and reflections on the speckle pattern of the specimen, ensuring that the DIC software can clearly identify the speckle pattern. Start the image acquisition software of computer terminal module 4 and set the frame rate, resolution, and storage path.

[0039] Step 6: After confirming that all mechanisms and sensors are functioning normally, start the test. The electronic controller 18 synchronously triggers the phase-synchronous generator 15 and the data acquisition unit, causing the slide rail platform 7 to move horizontally and uniformly along a straight line. The blade needle 14 pierces the thin film material specimen 21, the force sensor 12 collects the needle-piercing load in real time, and the high-definition camera 22 synchronously records speckle images.

[0040] Step 7: When the thin film material specimen 21 is completely punctured or the device reaches the set maximum displacement and set maximum force value, the load is controlled to drop sharply and the position is locked. Data acquisition is stopped simultaneously. Subsequently, the puncture load-time curve, displacement-time curve, DIC video and puncture image are generated.

[0041] Step 8: Import the data from force sensor 12 and electronic controller 18 into the analysis software of computer terminal module 4 to calculate mechanical parameters such as peak piercing force and piercing displacement. Analyze the image sequence using DIC software to obtain the full-field displacement field distribution, strain field distribution, and deformation evolution process of the sample. Finally, evaluate the failure mode and performance of the test results, including the piercing load-displacement curve, displacement-time curve, and displacement-strain contour map.

Claims

1. An adjustable lancing device test apparatus, characterized by, include: The instrumentation mechanism, the main fixing and loading module, the data acquisition module, and the computer terminal module; The stabbing mechanism, located above the frame structure, is used to adjust the insertion speed and angle of the stabbing tool. The fixing and loading main module is used to fix the thin film material specimen and adjust the pretension of the thin film material specimen, and the height of the puncture is kept at the same height as the center position of the thin film material specimen; a speckled film is set in the middle area of ​​the thin film material specimen. The data acquisition module, connected to the computer terminal module, is used to acquire image data of the film surface during the puncture process of the thin film material specimen and transmit it to the computer terminal module. The computer terminal module is used to process membrane surface image data. Using the initial image before puncture as the calibration image, it identifies speckle feature points in the image and calculates the strain at the membrane surface by comparing the positions of the speckle feature points in the image data before and after deformation.

2. An adjustable lance testing device according to claim 1, wherein, The piercing mechanism includes aluminum alloy profiles, a lead screw mounting platform, a slide rail, a simple platform, a lead screw, a four-jaw chuck, a piercing blade, a phase-synchronous generator, wires, an electronic driver, and an electronic controller. The aluminum alloy profiles are fixedly connected to form a rigid main frame. A pre-installed connection is made at the top between the phase-synchronous generator and the lead screw mounting platform. The lead screw mounting platform and the phase-synchronous generator are fixed above the main frame structure. A lead screw is rotatably mounted on the lead screw mounting platform, and the output shaft of the phase-synchronous generator is fixedly connected to the lead screw. Rotation of the output shaft of the phase-synchronous generator drives the lead screw to rotate. The simple platform is threadedly engaged with the lead screw and slidably connected to the slide rail, which is fixedly mounted on the lead screw mounting platform. Rotation of the lead screw drives the simple platform to move linearly along the slide rail. A four-jaw chuck is mounted on the simple platform, and a piercing blade is mounted on its other side. The electronic driver and electronic controller are connected via wires. The electronic controller changes the horizontal movement speed of the simple platform by changing the rotation speed of the phase-synchronous generator, thereby changing the insertion speed of the piercing blade.

3. The adjustable puncture testing device according to claim 2, characterized in that, A pressure sensor is installed between the four-jaw chuck and the simple platform. The pressure sensor is used to detect the force at the tip of the stab.

4. The adjustable puncture testing device according to claim 2, characterized in that, The main module for fixing and loading includes: a testing machine, a special flat jaw clamp for film testing, and a film material specimen; the base of the testing machine and the middle movable crossbeam are respectively fixedly connected to both ends of the special flat jaw clamp for film testing by pins. The film material specimen is placed in the lower special flat jaw clamp for film testing. The height of the middle movable crossbeam is adjusted so that the special flat jaw clamp for film testing is installed at both ends to hold the film material specimen, and the center position of the film material specimen is consistent with the height of the blade piercing, ensuring that the blade pierces into the film material specimen from the center.

5. The adjustable puncture testing device according to claim 2, characterized in that, The data acquisition module includes a speckle film, a high-definition camera, a tripod, a shutter connector, and a signal receiver. The speckle film is applied to a pre-reserved area in the center of the thin film material specimen. The high-definition camera is stably positioned behind and fixed to the main loading module via a tripod, ensuring that the high-definition camera captures images of the thin film material specimen and the speckle film pattern, and that the surface of the speckle film is free of reflection and wrinkles. The high-definition camera is connected to the signal receiver via a shutter cable to receive the transmitted signal, enabling interval photography during the experiment. This allows for obtaining image data of the thin film material specimen after being pierced by a blade at corresponding intervals during the experiment, ensuring continuous image data acquisition while reducing the amount of data.

6. An adjustable puncture testing device according to any one of claims 1-5, characterized in that, The test method is as follows: The first step is to determine the test plan, identify the test variables in the puncture test, select and prepare the thin film material specimen, and attach a speckle film to the middle area of ​​the film surface of the thin film material specimen and calibrate the calibration points. The second step is to install the test specimen. Fix both ends of the film material specimen to the clamping end of the special flat jaw clamp for film testing, and make sure that the height of the center area of ​​the film material specimen is consistent with the height of the puncture end to ensure that the film material specimen is held stably during the puncture test and does not slip. The third step is to control the insertion speed and angle of the piercing tool. The speed of the phase-synchronous generator is set by the electronic controller to control the horizontal movement speed of the simple platform. A high-definition camera is used to take pictures of the thin film material specimen as the initial calibration photos. The fourth step is to record relevant data. After setting the pretension, control the piercing system to simultaneously insert the piercing tool and stop after the piercing tool has completely penetrated the film material. At the same time as the piercing tool penetrates the film material, control the high-definition camera to take synchronous and intermittent photos of the test specimen film surface to accurately record the piercing load and its corresponding image data during the puncture test.

Images