A contact heating high temperature tensile test system for sheet material

Abstract

This utility model relates to the field of high-temperature mechanical property testing technology of materials, and is a contact heating high-temperature tensile testing system suitable for plates. It includes: a loading module for connecting to the testing machine and, in conjunction with a clamping module, applying force to the sample to achieve the tensile process; a heating module controlled by a cylinder with free stroke to move the heating block to press against the sample for heating, with an external insulation box having a window for observing the sample; and a fixing module serving as the base and support of the entire device, mounted on the testing machine. This utility model uses contact heating to achieve sample heating, resulting in a fast heating rate and uniform sample heating. The sample can rotate 90° to achieve heating and strain measurements separately. Precise temperature control is achieved by coupling laser temperature measurement with a temperature controller and a heating rod. The high-temperature zone and the normal-temperature zone are separated by thermal insulation material. The high-temperature zone uses a clearance fit to ensure sufficient space for the pin's thermal expansion, thereby preventing high-temperature adhesion.

Description

Technical Field

[0001] This utility model belongs to the field of high-temperature mechanical property testing technology of materials, specifically relating to a tensile testing device for plate samples under high-temperature environment. Background Technology

[0002] High-temperature tensile testing of materials comprehensively evaluates their mechanical properties and deformation behavior under high-temperature conditions by measuring their tensile strength, yield strength, ductility, and creep characteristics. This test not only provides important data for material design optimization and process improvement but also verifies high-temperature mechanical theoretical models and supports the accuracy of numerical simulations. Furthermore, it helps predict the service life of materials in high-temperature environments, ensuring the safety and reliability of equipment and structures, and providing crucial data support for material selection and application in high-temperature fields such as aerospace, energy, and chemical engineering.

[0003] Many engineering materials exist in the form of plates in practical applications, and plate-shaped specimens can be directly prepared from these plates. Their microstructure and properties can represent the actual conditions of the materials used. Plate-shaped specimen clamps can apply tensile force evenly, avoiding stress concentration at the clamping points that could lead to test failure.

[0004] Currently, most high-temperature tensile tests rely on high-temperature furnace heating, but furnace heating is slow, resulting in low test efficiency. Other heating methods, such as resistance heating, are limited by the shape and conductivity of the specimen, while induction heating is limited by uneven heating. Existing devices and heating methods cannot simultaneously meet the requirements of high heating efficiency and uniform temperature distribution in high-temperature tensile tests. Therefore, there is an urgent need to design a testing device capable of conducting high-temperature tensile tests with high heating efficiency and uniform temperature distribution, and accurately measuring data.

[0005] Current specimen deformation measurement mainly adopts contact measurement methods, including tools such as extensometers, strain gauges, and eddy current sensors. In high-temperature deformation measurement, since contact measurement tools must be in contact with the test specimen, the temperature of the measuring tools themselves will continue to rise, leading to increased deformation measurement errors and potentially causing damage or even destruction to the measuring tools. Therefore, it is impossible to accurately obtain the deformation strain data of the test specimen. To address this, we propose a contact heating high-temperature tensile testing system for sheet metal. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a contact heating high-temperature tensile testing system for sheet materials. This system can efficiently perform high-temperature tensile tests on sheet specimens of various materials and obtain accurate test data. The device uses contact heating for temperature rise, and a temperature controller combined with an infrared laser temperature measuring head is used to monitor the temperature in real time and control the power of the heating rod to adjust the temperature. The strain measurement system uses non-contact measuring equipment for measurement, enabling efficient high-temperature tensile testing of sheet specimens.

[0007] The technical solution of this utility model is: The designed system includes a loading module, a clamping module, a heating module, a fixing module, a temperature control module, and a measurement module. The sheet metal specimen is fixed by the clamping module and connected to the loading modules at both ends. The loading module is connected to the crossbeam of the testing machine to apply force. The left and right ends are heating modules, partly connected to the fixing module, and the movement of the heating blocks is controlled by cylinders with free stroke. Heating rods are placed in the heating blocks to heat the specimen. An insulated box with windows for easy observation of the specimen is also provided externally, filled with quartz glass. The fixing module is mounted on the universal testing machine, serving as the foundation for the entire device. The temperature control module is a temperature controller. The measurement module consists of an infrared laser thermometer, an image acquisition and processing mechanism. The thermometer measures the surface temperature of the specimen and outputs the result to the temperature controller. The image processing mechanism captures and records continuous images of the specimen during the tensile process and processes them to obtain deformation and strain information. The sheet metal specimen is connected to the clamping module, the clamping module to the loading module, and the heating module to the fixing module using a six-degree-of-freedom confined structure, with clearance fits at all connections to allow for thermal expansion. This invention solves the problems of slow heating rate, uneven heating, and inaccurate strain measurement when existing plate-shaped specimens are subjected to high-temperature tensile testing.

[0008] A further technical solution of this utility model is: the system further includes: An air pump, located on the left side of the testing machine, provides power to the cylinder; A spotlight, mounted on a tripod, provides supplemental lighting during the measurement and data acquisition process; A computer, connected to the stretching machine and an industrial camera, is used to process experimental data.

[0009] A further technical solution of this utility model is: the loading module includes a connector connected to the testing machine by pins, a cylindrical alumina ceramic for heat insulation to prevent the equipment from being damaged by heat, and a tray with a groove in the middle for supporting the clamping module. The three are connected by six pins evenly distributed around the circumference, and the whole is symmetrically distributed from top to bottom, for connecting the testing machine to apply force to the sample.

[0010] A further technical solution of this utility model is: the clamping module is symmetrically distributed vertically, and is a cylindrical clamping device with a rotating rod, with a gap in the middle and threaded holes on the sides for placing and clamping the sample. Simultaneously, a threaded hole is formed on the surface of the large cylindrical platform at the end for mounting the rotating rod. The rotation angle control mechanism includes a button... Calculate the formed guide groove, where is the guide groove angle, is the additional offset angle due to the presence of the rotating rod, b is the radius of the rotating rod, and r is the rotation radius of the upper end of the fixture. The tolerance is controlled within ±0.5° to accurately achieve a 90° rotation of the sample. A further technical solution of this utility model is as follows: the heating module is symmetrically distributed on the left and right sides, and consists of a small cylinder with free stroke, a heating block connected to the top of the cylinder, and an external heat preservation box. The cylinder is powered by an air pump, and the top is controlled to move freely and stop by a manual control valve. The heating block is specifically divided into three parts: the first layer is a connecting block connected to the cylinder, the second layer is a heat insulation plate that blocks heat transfer, and the third layer is a hot work die steel that can hold the heating rod. The heat preservation box is fixed between the two mounting brackets. The box body includes an internally hollow outer shell and a heat insulation cotton filling layer. The box door has an observation window, and the window is made of quartz glass to ensure light transmission and heat insulation.

[0011] A further technical solution of this utility model is: the fixing module includes a steel plate and a mounting frame. The steel plate is placed on an existing tensile testing machine. The shape and size of the steel plate are designed to match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting frame is symmetrically distributed on the left and right sides and is used to install and fix the cylinder and the heat preservation box.

[0012] A further technical solution of this utility model is: the measuring module consists of a spotlight, an industrial camera, an infrared laser temperature measuring head, and a tripod support frame. The tripod support frame is used to adjust the height, the platform on which the camera and spotlight are mounted can also be adjusted in height, the spotlight can also be adjusted in tilt angle, and the infrared laser temperature measuring head is mounted on a specially designed bracket, which can adjust both the height and tilt angle.

[0013] A further technical solution of this utility model is: the industrial camera continuously captures images during the tensile process of the sample. Before the sample is stretched, speckle coating must be uniformly sprayed according to requirements. After the captured images are obtained, post-processing is performed using computer program software to obtain the strain data of the sample.

[0014] The system for measuring the high-temperature tensile properties of materials using the contact heating high-temperature tensile testing device for sheet metal comprises the following steps: Install the device on the testing machine and connect the upper and lower loading modules of the device to the loading part of the testing machine using pins; Step 2: Place the heating rod, laser temperature measuring head, industrial camera, air pump, and temperature controller, and connect the relevant interfaces; Step 3: Open the insulated box door and adjust the rotating rod so that the groove of the clamping module is parallel to the front view surface; Step 4: Place both ends of the plate-shaped sample that has been sanded and sprayed with speckled coating into the groove and fix it with screws; Step 5: Rotate the clamping module to rotate the sample 90°, manipulate the cylinder to move the heating block closer to the plate-shaped sample, and close the heat preservation chamber door; Step 6: Start the heating rod in the temperature controller to begin heating, and adjust the position of the laser temperature measuring head so that the temperature of the intermediate sample can be measured; Step 7: Once the temperature controller shows that the temperature has reached the target temperature, control the cylinder to adjust the heating block away from the sample so that the sample can rotate 90°. Step 8: When the sample is facing the tester, the heating blocks are on both sides of the sample. The laser temperature measuring head continues to measure the temperature, and the temperature controller controls the power of the heating rod to maintain the temperature. Step 9: After the temperature stabilizes, turn on the spotlight, adjust the camera position, and start the testing machine to conduct the test; Step 10: After the experiment, turn off the temperature controller, open the chamber door to dissipate heat, and save the data.

[0015] The beneficial effects of this utility model are as follows: This utility model uses contact heating to achieve sample heating, which results in a fast heating rate and uniform sample heating. The sample can be rotated 90° to achieve heating and strain measurement separately. Furthermore, precise temperature control is achieved by coupling laser thermometry with a temperature controller and a heating rod. The high-temperature zone and the normal-temperature zone are separated by thermal insulation material. The high-temperature zone uses a clearance fit to ensure sufficient space for the thermal expansion of the pins, thereby preventing high-temperature adhesion. Specific advantages are analyzed as follows: 1. Plate-shaped specimens can be used for high-temperature mechanical property testing of various materials, and are highly efficient and accurate in measurement.

[0016] 2. The sample can be precisely positioned in the fixture during installation. The fixture is simple and quick to operate, and is easy to install and disassemble manually.

[0017] 3. The 90° rotation of the clamp allows for position changes between the front and side of the sample, facilitating heating and image capture.

[0018] 4. Different materials are used for each part of the device according to its function. For example, the clamping part uses die steel commonly used in hot stamping, which has sufficient rigidity, stability and heat resistance. The heat insulation material is alumina ceramic to ensure sufficient heat insulation. The service life of each part can be guaranteed.

[0019] 5. The test temperature control adopts an infrared laser thermometer, a heating rod coupled with a temperature controller, and is surrounded by an insulated box to achieve precise temperature control and temperature stability during the experiment.

[0020] 6. Strain measurement is performed using non-contact measuring equipment, which has the advantages of full-field measurement and high accuracy, and can provide detailed displacement and strain information. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a contact heating high-temperature tensile testing system for sheet metal. Figure 2 This is a schematic diagram of the heating state of the test fixture in a specific embodiment of this utility model; Figure 3This is a schematic diagram of the measurement state of the test fixture in a specific embodiment of this utility model; Figure 4 This is a schematic diagram of the test fixture loading module of a specific embodiment of the present invention; Figure 5 This is a schematic diagram of the test tooling clamping module according to a specific embodiment of the present invention; Figure 6 This is a schematic diagram of the heating module of the test fixture in a specific embodiment of this utility model; Figure 7 This is a schematic diagram of the test fixture fixing module according to a specific embodiment of the present invention; Figure 8 This is a schematic diagram of the test fixture measurement module of a specific embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1-Loading module; 2-Clamping module; 3-Heating module; 4-Fixing module; 5-Testing machine; 6-Measuring module; 7-Temperature control module; 8-Air pump; 11-Testing machine connector; 12-Circular heat insulation block; 13-Tray; 21-Rotating rod; 22-Cylindrical clamp; 31-Cylinder; 32-Heating block; 33-Insulation box; 320 - Mold steel body; 321 - Square heat insulation block; 322 - Cylinder connecting body; 41-Fixed bracket; 42-Fixed base; 61-Spotlight; 62-Industrial camera; 63-Infrared laser temperature measuring head; 64-Triangular support frame. Detailed Implementation

[0023] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Example

[0024] like Figures 1-8 As shown, this embodiment provides a contact heating high-temperature tensile testing system for sheet metal, comprising: Loading module 1 is used to connect with testing machine 5 and work with clamping module 2 to apply force to the specimen to achieve the tensile process; The heating module 3 is controlled by a cylinder 31 with free stroke to move the heating block 32 to fit closely to the sample for heating. The external heat preservation box 33 has a window for observing the sample. Fixed module 4, serving as the base and support for the entire device, is installed on the testing machine 5; Temperature control module 7 connects to the heating block and temperature measuring device. Through signal feedback, it adjusts the heating power to achieve precise control of the sample temperature. Measurement module 6, mounted on triangular support frame 64, measures the surface temperature of the sample and captures continuous deformation images of the sample during the tensile process, and processes them to obtain strain information. It consists of an image acquisition mechanism and an image processing mechanism. The acquisition mechanism is mounted on the tripod, and the acquisition port is aligned with the parallel section of the sample through the observation window to acquire the deformation and strain information of the parallel section of the sample during the tensile process. The image processing mechanism is a professional software program that converts the continuous deformation images obtained by the acquisition mechanism into digital deformation and strain information.

[0025] Specifically, in this embodiment, the fixing module 4 includes a steel plate 42 and a mounting frame 41. The steel plate is placed on an existing tensile testing machine, and its shape and size are designed to match the support columns and emergency stop button of the existing testing machine, serving as a limit reference. The mounting frame is symmetrically distributed on both sides and is used to install and fix the cylinder 31 and the heat preservation box 33. The air pump 8 is arranged on the left side of the testing machine 5 to provide power to the cylinder 31. The fixing module can use a thick steel plate with a high density to ensure stability. The heating block where the heating rod is located can use mold steel commonly used in hot stamping dies. The heat insulation material can be alumina ceramic. The cylinder is selected with a stroke of 15~75mm. The quasi-SC cylinder uses a standard air pipe to connect the air inlet to the control valve and air pump. The air pump's insulated housing can be made of high-quality stainless steel with a double layer for arranging insulation cotton. The observation window is a square aperture made of high-transparency quartz optical glass to ensure good light transmission. The clamping module is made of hot-work die steel, and the loading module is made of cold-work die steel. The infrared laser camera is selected to measure temperatures from 20 to 1000℃ and can output signals in RS485 format for connection to temperature controllers that can accept such signals. A high-resolution industrial camera is selected and connected to the image processing mechanism via a signal cable for data transmission. The image processing mechanism uses professional computer software.

[0026] In one implementation, since the image quality is affected by different ambient light, a spotlight is set up to provide supplementary lighting, ensuring the ambient brightness and ensuring that the image acquisition mechanism acquires high-quality images.

[0027] In one embodiment, the support frame for mounting the industrial camera adopts a common tripod support frame and has a lifting mechanism to achieve free height adjustment, ensuring that the imaging port is aligned with the sample in the rotating observation window. The spotlight is installed behind the camera and can be tilted at an adjustable angle. The infrared laser temperature measuring head is installed below the camera and placed on a bracket with adjustable height and tilt angle.

[0028] In one embodiment, the sample is placed between two cylindrical clamps and secured with screws. The side of the sample initially faces the tester. The heating block is moved by a controlled cylinder to make it fit against the sample, and heating is initiated. A custom-made heating rod with a temperature range of 25~1000℃ is selected. The temperature is measured by an infrared thermometer and displayed on the temperature controller screen. Once the specified temperature is reached, the cylinder is moved away from the sample, allowing the sample to rotate so that its front faces the tester. The heating block provides radiant heating from both sides, and the temperature is observed simultaneously. If the sample temperature decreases, the power of the heating rod is increased to maintain the sample surface temperature at the target temperature.

[0029] In one embodiment, the loading module 1 includes a connector 11 connected to the testing machine via pins, a cylindrical alumina ceramic 12 for heat insulation to prevent the equipment from being damaged by heat, and a tray 13 with a groove in the middle that supports the clamping module. The three are connected by six pins evenly distributed around the circumference and are symmetrically distributed up and down, which is used to connect the testing machine to apply force to the sample.

[0030] In one embodiment, the clamping module 2 is symmetrically distributed vertically, consisting of a cylindrical clamping device 22 paired with a rotating rod 21, with a gap in the middle and threaded holes on the sides for placing and clamping the sample. Simultaneously, a threaded hole is formed on the surface of the large cylindrical platform at the end for mounting the rotating rod, aligning with the angle of the tray groove in the loading module. The angle of the groove opening on the tray is calculated according to the following formula to accurately achieve a 90° rotation of the sample:

[0031] In one embodiment, the heating module 3 is symmetrically distributed on the left and right sides, and consists of a small cylinder 31 with free stroke, a heating block 32 connected to the top of the cylinder, and an external heat preservation box 33. The cylinder is powered by an air pump 8, and the top of the cylinder is controlled to move freely and stop by a manual control valve 9. The heating block is specifically divided into three parts: the first layer is a connecting block connected to the cylinder, the second layer is a heat insulation plate that blocks heat transfer, and the third layer is a hot work die steel that can hold the heating rod. The heat preservation box is fixed between the two mounting brackets 41 on both sides. The box body includes an internally hollow outer shell and a heat insulation cotton filling layer. The box door has an observation window made of quartz glass to ensure light transmission and heat insulation.

[0032] In one embodiment, the fixing module 4 includes a steel plate 42 and a mounting frame 41. The steel plate is placed on an existing tensile testing machine. The shape and size of the steel plate are designed to match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting frame is symmetrically distributed on the left and right sides and is used to install and fix the cylinder 31 and the heat preservation box 33.

[0033] In one embodiment, the measurement module 6 consists of a spotlight 61, an industrial camera 62, an infrared laser temperature measuring head 63, and a tripod support 64. The tripod support is used to adjust the height, the platform on which the camera and spotlight are mounted can also be adjusted in height, the spotlight can also be adjusted in tilt angle, and the infrared laser temperature measuring head is mounted on a specially designed bracket, which can adjust both the height and tilt angle.

[0034] In one embodiment, the surface of the sample should be polished first to ensure a smooth surface, and then uniformly sprayed with speckle treatment. Based on the changes in speckle shape from multiple consecutive images, the deformation and strain information of the sample is obtained using a professional software program, ensuring measurement accuracy.

[0035] This embodiment also provides a specific testing process, including: Based on the established positioning benchmark, the fixed base is installed on the central platform of the tensile testing machine. After ensuring stability, the mounting bracket is fixed to the base with screws, arranged symmetrically on both sides. The cylinder, air pump, hose, and manual control valve are removed. The cylinder is connected to the air pump via the manual control valve using the hose. After adjusting the position, the cylinder is fixed in the center of the mounting bracket. The clamping module is vertically inserted through the circular tray in the loading module. It is then connected to the other two components of the loading module using screws. The clamping module is rotated until the preset threaded hole appears in the field of vision. The threaded rotating rod is removed and installed. The loading module is then fixed to the upper and lower mounting cylinders of the testing machine using pins, arranged symmetrically on both sides. The insulation box is then installed first. Place the bottom component onto the lower assembly using the clamping fixture. Adjust its position and use screws to connect and secure the left and right sides of the heating chamber to the mounting brackets. Open the insulation chamber door. Connect the three heating block components in an orderly manner using screws. Adjust the cylinder extension rod to extend it into the insulation chamber, and then install the heating block onto the extension rod. Remove the heating rod and place it in the pre-set circular hole in the heating block. The connecting wire of the heating rod passes through the pre-set hole in the lower left corner of the insulation chamber and connects to the temperature controller and power supply. Install the infrared laser temperature measuring head, industrial camera, and spotlight onto the tripod using screws, adjusting their positions so that they are directly facing the center of the insulation chamber. Connect the infrared laser temperature measuring head cable to the temperature controller to complete the overall system setup.

[0036] After the system is fully set up, the tensile specimen is removed, and the speckle pattern is created. The specific steps are as follows: First, the specimen is sanded to remove burrs and flash, ensuring a smooth surface. Then, a white primer is sprayed on, requiring it to be heat-resistant and not easily peeled off. Next, a black primer is sprayed evenly, also requiring heat resistance and not easily peeled off. After the primer has solidified, the specimen is placed in the clamping fixture and secured with screws to ensure stability during the tensile process. The fixture position is adjusted by rotating the upper and lower levers to align the specimen's sprayed surface with the left and right heating blocks. The manual control valve is used to control the cylinder to bring the heating blocks closer to the specimen. The insulation chamber door is closed, the temperature controller is turned on, and the infrared laser temperature sensor is adjusted to measure and display the temperature of the central specimen surface on the controller. The heating rod power is connected, and the temperature controller is used to control the heating rod power to begin heating the specimen. Once the instrument displays the preset target temperature, the manual control valve is used to move the heating blocks away from the specimen, and the rotating lever is used to move the specimen... The sample is rotated 90° so that the painted surface faces the experimenter. The temperature is monitored by the temperature sensor. If the sample surface temperature drops due to the distance of the heating blocks, the heating rod power is increased by the temperature controller so that the sample temperature can be raised and maintained through radiation heating of both sides. After the temperature reading of the temperature sensor stabilizes, the spotlight is turned on so that it can illuminate the sample surface. The position, focal length, aperture and other parameters of the industrial camera are adjusted to display a clear image of the sample surface. After the image is clear, the tensile testing machine is started. The crossbeam of the tensile testing machine drives the upper clamp to stretch the sample upward through the connecting body. The industrial camera continuously collects images of the sample speckle changes and transmits them to the computer for storage through the connection cable for processing and analysis by the software program. When the sample breaks, the testing machine stops according to the set steps, the chamber door is opened to dissipate heat from the sample, and the software program processes the data to obtain the deformation and strain information of the sample during this tensile process.

[0037] The above embodiments merely illustrate specific implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A contact heating high-temperature tensile testing system for sheet metal, characterized in that, The system includes: The loading module (1) is used to connect with the testing machine (5) and, together with the clamping module (2), apply force to the specimen to achieve the tensile process; The heating module (3) is controlled by a cylinder (31) with free stroke to move the heating block (32) to fit closely to the sample for heating. The external heat preservation box (33) has a window for observing the sample. The fixed module (4), serving as the base and support for the entire device, is installed on the testing machine (5); The temperature control module (7) is connected to the heating block and the temperature measuring device. Through signal feedback, it adjusts the heating power to achieve precise control of the sample temperature. The measurement module (6) is installed on the triangular support frame (64) to measure the surface temperature of the sample and capture continuous deformation images of the sample during the tensile process, and then process them to obtain strain information.

2. The contact heating high-temperature tensile testing system for sheet metal according to claim 1, characterized in that, The system also includes: An air pump (8) is located on the left side of the testing machine (5) to provide power to the cylinder (31); A spotlight (61) is placed on a tripod to provide supplemental lighting during the measurement and data acquisition process.

3. The contact heating high-temperature tensile testing system for sheet metal according to claim 1, characterized in that, The loading module (1) includes a connector (11) connected to the testing machine by pins, a cylindrical alumina ceramic (12) for heat insulation to prevent the equipment from being damaged by heat, and a tray (13) with a groove in the middle to support the clamping module. The three are connected by six pins evenly distributed around the circumference and are symmetrically distributed up and down. The loading module is used to connect the testing machine to apply force to the sample.

4. The contact heating high-temperature tensile testing system for sheet metal according to claim 1, characterized in that, The clamping module (2) is symmetrically distributed vertically. It is a cylindrical clamping device (22) with a rotating rod (21). There is a gap in the middle and a threaded hole on the side to place and clamp the sample. At the same time, there is a threaded hole on the surface of the large cylindrical platform at the end for the rotating rod to be installed.

5. The contact heating high-temperature tensile testing system for sheet metal according to claim 1, characterized in that, The heating module (3) is symmetrically distributed on the left and right sides. It consists of a small cylinder (31) with free stroke, a heating block (32) connected to the top of the cylinder, and an external heat preservation box (33). The cylinder is powered by an air pump (8) and the top is controlled to move freely and stop by a manual control valve (9). The heating block is specifically divided into three parts: the first layer is a connecting block connected to the cylinder, the second layer is a heat insulation plate that blocks heat transfer, and the third layer is a hot work mold steel that can hold the heating rod. The heat preservation box is fixed between the two mounting brackets (41). The box includes an internally hollow shell and a heat insulation cotton filling layer. The box door has an observation window made of quartz glass to ensure light transmission and heat insulation.

6. The contact heating high-temperature tensile testing system for sheet metal according to claim 1, characterized in that, The fixing module (4) includes a steel plate (42) and a mounting bracket (41). The steel plate is placed on the existing tensile testing machine. The design shape and size match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting bracket is symmetrically distributed on the left and right sides and is used to install the fixing cylinder (31) and the heat preservation box (33).

7. The contact heating high-temperature tensile testing system for sheet metal according to claim 1, characterized in that, The measurement module (6) consists of a spotlight (61), an industrial camera (62), an infrared laser temperature measuring head (63), and a tripod support frame (64). The tripod support frame is used to adjust the height, and the infrared laser temperature measuring head is installed on the designed bracket.

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