Torque testing device for cylindrical shell

Abstract

The utility model provides a torque test device of a cylindrical shell, which integrates a deformation measurement system based on a digital image correlation technology and a stereo camera tracking measurement technology into a high-temperature buckling test device of a thin-wall cylindrical shell structure. And the three-dimensional displacement and the full-field strain of the thin-wall cylindrical shell structure in the test process are dynamically monitored and displayed in real time. And processing the captured image by combining a digital image related technology to obtain the cylindrical shell structure modality at initial buckling, over-buckling and buckling failure moments in the whole buckling process. The thermal infrared imager integrated in the test device can realize the non-contact global monitoring of the temperature change condition of the thin-wall cylindrical shell structure, and can reliably realize the dynamic monitoring and real-time display of the temperature of the thin-wall cylindrical shell through the data acquisition-transmission-computer terminal. Therefore, the buckling performance and modal change of the thin-wall cylindrical shell under the coupling action of the thermal load and the mechanical load are explored, and the bearing capacity of the thin-wall cylindrical shell at high temperature is fully explored.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of material mechanics performance test, specifically, relate to a kind of torque testing device of cylindrical shell. BACKGROUND

[0002] At present, cylindrical shell is often used in various engineering structures, for example, missile, storage tank, chimney, offshore platform or wind turbine tower, especially aerospace structure usually needs to work under the action of thermal-mechanical coupling, for example, high-speed aircraft in the atmosphere serves in the intersection of structural mechanics and fluid mechanics, under extreme flight conditions, transient thermal gradient is generated, which affects the strength and stiffness of the structure.

[0003] How thin-walled cylindrical shell components work efficiently under strong thermal stress and reduce losses is a common problem in engineering. Under such working environment, due to the change of external temperature environment, external excitation and temperature load are coupled on the thin-walled cylindrical shell structure, and due to thermal expansion, the non-uniform heating of different positions of the thin-walled cylindrical shell structure will cause complex stress and strain, which will seriously affect the stability of the structure and thus affect its service life.

[0004] Current thin-walled cylindrical shell structures are widely used due to their high mass efficiency, but there are few studies on the buckling test of thin-walled cylindrical shells under high temperature, and the buckling performance of thin-walled cylindrical shells under high temperature is still very complex, which is not only affected by the form, size, material and loading condition of the structure, but also affected by initial deformation, geometric defects, residual stress and other factors. In early structural design, little consideration is given to buckling stability, and compared with the complex buckling test of thin-walled cylindrical shells under normal temperature, there is less test data under high temperature. SUMMARY

[0005] To fully explore the bearing capacity of thin-walled cylindrical shells under high temperature and explore the buckling performance and modal change of thin-walled cylindrical shells under the coupling action of thermal load and mechanical load, the utility model provides a torque testing device for cylindrical shell, which can accurately simulate the in-plane compression stress of thin-walled cylindrical shell under high temperature conditions.

[0006] The utility model provides a kind of torque testing device of cylindrical shell, including loading system, temperature rising and constant temperature system, deformation measurement system, initial defect detection system and infrared thermal image temperature monitoring system;The loading system includes counterforce frame, first push cylinder, rotating motor, spline shaft, force transmission plate and fixed end plate;The counterforce frame is in the shape of Chinese character;The first push cylinder is fixed on the upper end of the counterforce frame, and the output end is connected with the rotating motor, for controlling the rotating motor moves in axial direction;The output end of the rotating motor is vertically arranged downward, and is fixedly connected with the upper end of the spline shaft, and the force transmission plate is coaxially fixed on the lower end of the spline shaft;Two fixed end plates are symmetrically arranged at the two ends of thin-walled cylindrical shell test piece, and the side of the fixed end plate close to thin-walled cylindrical shell test piece is annularly provided with clamping group for mounting and fixing the thin-walled cylindrical shell test piece;The fixed end plate above the thin-walled cylindrical shell test piece is fixedly connected at the bottom of the force transmission plate by bolt, and the fixed end plate below is fixedly connected on the counterforce frame by bolt;It further includes mounting seat, and the rotating motor is installed in the mounting seat;The counterforce frame is provided with sliding groove, and the sliding groove is symmetrically concave on both sides and provided with guide slot, the mounting seat is slidably connected with the sliding groove, the mounting seat is protrudingly provided with protrusion on both sides, and the protrusion is slidably connected with the guide slot;The first push cylinder is arranged above the sliding groove;When thin-walled cylindrical shell test piece is clamped and fixed on the loading system by clamping group, the thin-walled cylindrical shell test piece is coaxially arranged with the output shaft of rotating motor, and the rotation of rotating motor is controlled to apply torsional load to the thin-walled cylindrical shell test piece;The temperature rising and constant temperature system includes infrared heating device and temperature control software, and the infrared heating device is arranged in the interior of the thin-walled cylindrical shell test piece to heat the thin-walled cylindrical shell test piece;The deformation measurement system is used for measuring the full-field strain distribution of thin-walled cylindrical shell test piece and the spatial displacement of preset target point;The initial defect detection system includes 3D scanner, which is used for scanning the surface of thin-walled cylindrical shell test piece to form a real three-dimensional model of thin-walled cylindrical shell test piece, and comparing with ideal test piece three-dimensional model to obtain the geometric initial defect of thin-walled cylindrical shell test piece;The infrared thermal image temperature monitoring system includes Tianpiao Yunke I series scientific research type infrared thermal imager, which can monitor the global temperature of thin-walled cylindrical shell test piece in real time by non-contact temperature measurement means, and can transmit streaming media video through Ethernet to view real-time image on computer.

[0007] As further optimization, the types of the thin-walled cylindrical shell test piece include: unstiffened thin-walled cylindrical shell, stiffened thin-walled cylindrical shell, perforated thin-walled cylindrical shell, composite unstiffened thin-walled cylindrical shell, composite stiffened thin-walled cylindrical shell and composite perforated thin-walled cylindrical shell.

[0008] As further optimization, the clamping group comprises a ring-shaped ring, clamping ears and clamping pieces, a plurality of clamping ears are arranged on the outer side of the ring-shaped ring in a uniform interval, and the outer side wall of the ring-shaped ring is adapted to be in close sliding contact with the inner side wall of the thin-walled cylindrical shell specimen; the clamping pieces are installed on the clamping ears, and the clamping pieces are in abutment with the outer side wall of the thin-walled cylindrical shell specimen through the end portion, so as to clamp and fix the thin-walled cylindrical shell specimen on the fixed end plate.

[0009] As further optimization, the clamping end of the clamping piece is arranged in an arc shape.

[0010] As further optimization, the bottom of the counterforce frame is provided with an inner cavity, a second pushing cylinder is arranged in the inner cavity, the second pushing cylinder is vertically arranged, and the output end is fixedly connected with the infrared heating device; the counterforce frame and the fixed end plate are provided with through holes suitable for the infrared heating device to pass through.

[0011] As further optimization, the infrared heating device comprises a quartz fixed support and an infrared heating pipe group, and the infrared heating pipe group is arranged in a circumferential array on the upper end of the quartz fixed support.

[0012] As further optimization, the deformation measurement system comprises a high-speed camera and digital image analysis software, which are used for measuring the full-field strain distribution of the thin-walled cylindrical shell specimen and the spatial displacement of a preset target point, can capture the load-strain curve and deformation trajectory curve of each point of the thin-walled cylindrical shell specimen, and calculate the mechanical performance parameters, so as to provide deformation and mechanical data for the test and analysis of the structure.

[0013] Compared with the prior art, the utility model has the advantages of the following:

[0014] The application provides a torque test device for a cylindrical shell, a deformation measurement system based on digital image correlation technology and stereo camera tracking measurement technology is developed, and the deformation measurement system is integrated in a high-temperature buckling test device for a thin-walled cylindrical shell structure, so that the three-dimensional displacement and full-field strain of the thin-walled cylindrical shell structure in the test process can be dynamically monitored and displayed in real time. High-frequency full-size photography of the buckling process of the thin-walled cylindrical shell structure is combined with digital image correlation technology in the later stage, the captured images are processed, the modal of the thin-walled cylindrical shell structure at the initial buckling, over buckling and buckling failure moments in the whole buckling process can be obtained. The infrared thermal imager integrated in the test device can still distinguish even weak temperature changes, so that the temperature change of the thin-walled cylindrical shell structure can be monitored globally without contact, and the dynamic monitoring and real-time display of the temperature of the cylindrical shell can be reliably realized through data acquisition-transmission-computer terminal. The buckling performance and modal change of the thin-walled cylindrical shell under the coupling action of thermal load and mechanical load are explored, and the bearing capacity of the thin-walled cylindrical shell under high temperature is fully developed. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 is a loading system structure schematic diagram of a torque test device for a cylindrical shell of the present application;

[0017] Figure 2 is a three-dimensional schematic diagram of the monitoring system during monitoring of the present application;

[0018] Figure 3 is a top view schematic diagram of the monitoring system during monitoring of the present application;

[0019] Figure 4 is a cross-sectional schematic diagram of the loading system of the torque test device for a cylindrical shell of the present application;

[0020] Figure 5 is a structure schematic diagram of the fixed end plate of the present application;

[0021] Figure 6 is a cross-sectional structure schematic diagram of the clamping group of the present application.

[0022] Marked in the figure: 1, loading system; 2, counterforce frame; 3, first push cylinder; 4, rotating motor; 5, spline shaft; 6, force transmission plate; 7, fixed end plate; 8, thin-walled cylindrical shell test piece; 9, infrared heating device; 10, deformation measurement system; 11, infrared thermal imager; 12, clamping group; 13, annular ring; 14, clamping ear; 15, clamping piece; 16, mounting seat; 17, sliding groove; 18, inner cavity; 19, second push cylinder; 20, through hole; 21, quartz fixed support; 22, infrared heating pipe group; 23, guide groove; 24, protruding block. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0024] As shown in Figures 1 to 6 A torque test device for a cylindrical shell includes a loading system 1, a temperature rising and constant temperature system, a deformation measurement system 10, an initial defect detection system and an infrared thermal image temperature monitoring system.

[0025] The loading system 1 includes a counterforce frame 2, a first push cylinder 3, a rotating motor 4, a spline shaft 5, a transmission plate 6 and a fixed end plate 7. The counterforce frame 2 is in the shape of a Chinese character. The first push cylinder 3 is fixedly arranged on the upper end of the counterforce frame 2, and the output end is connected with the rotating motor 4, which is used to control the rotating motor 4 to move in the axial direction. In the present embodiment, the rotating motor 4 is a servo motor. The output end of the rotating motor 4 is arranged vertically downward, and is fixedly connected with the upper end of the spline shaft 5. The transmission plate 6 is coaxially fixedly arranged on the lower end of the spline shaft 5. Two fixed end plates 7 are symmetrically arranged on the two ends of the thin-walled cylindrical shell test piece 8. The fixed end plate 7 close to the thin-walled cylindrical shell test piece 8 is annularly arranged on one side, and is provided with a clamping group 12 for mounting and fixing the thin-walled cylindrical shell test piece 8. The fixed end plate 7 above the thin-walled cylindrical shell test piece 8 is fixedly connected with the bottom of the transmission plate 6 through bolts, and the fixed end plate 7 below is fixedly connected with the counterforce frame 2 through bolts. When the thin-walled cylindrical shell test piece 8 is clamped and fixed on the loading system 1 through the clamping group 12, the thin-walled cylindrical shell test piece 8 is coaxially arranged with the output shaft of the rotating motor 4. By controlling the rotation of the rotating motor 4, a torsional load is applied to the thin-walled cylindrical shell test piece 8.

[0026] Preferably, the loading system 1 further comprises a mounting seat 16, the rotating motor 4 is mounted in the mounting seat 16; the counterforce frame 2 is provided with a sliding groove 17, the sliding groove 17 is symmetrically concave on both sides and provided with a guide groove 23, the mounting seat 16 is in sliding connection with the sliding groove 17, the mounting seat 16 is provided with a protrusion 24 on both sides, the protrusion 24 is in sliding connection with the guide groove 23; the first pushing cylinder 3 is arranged above the sliding groove 17. By arranging the first pushing cylinder 3, the output end of the rotating motor 4 can be adjusted to be close to or away from the thin-walled cylindrical shell test piece 8 to facilitate the butt joint, and further by arranging the mounting seat 16 and the sliding groove 17, the stability of the rotating motor 4 during the axial movement is ensured, wherein the mounting seat 16 and the sliding groove 17 are stable and immovable in the radial direction through the guidance of the protrusion 24 and the vertical guide groove 23, so that when the rotating motor 4 applies a torque, the rotating motor 4 itself is immovable relative to the counterforce frame 2.

[0027] Preferably, the temperature rising and constant temperature system comprises an infrared heating device 9 and temperature control software, the infrared heating device 9 is arranged in the interior of the thin-walled cylindrical shell test piece 8 to heat the thin-walled cylindrical shell test piece 8 and apply a thermal load; preferably, the infrared heating device 9 comprises a quartz fixed support 21 and an infrared heating pipe group 22, the infrared heating pipe group 22 is arranged in a circumferential array on the upper end of the quartz fixed support 21, the infrared heating pipe group 22 is supported by the quartz fixed support 21 to heat the thin-walled cylindrical shell test piece 8 from the interior of the thin-walled cylindrical shell test piece 8, and further, a temperature measuring thermocouple can be arranged to monitor the temperature change to facilitate the adjustment of the heating temperature and the constant temperature condition.

[0028] Preferably, the deformation measurement system 10, i.e. three-dimensional full-field strain (DIC), comprises a high-speed camera and digital image analysis software, which are used to measure the full-field strain distribution of the thin-walled cylindrical shell test piece 8 and the spatial displacement of a preset target point; by continuously photographing the measured thin-walled cylindrical shell test piece 8, the load-strain curve and the deformation trajectory curve of each point of the thin-walled cylindrical shell test piece 8 can be captured after software analysis, and various mechanical performance parameters can be calculated, thereby providing deformation and mechanical data for the test and analysis of the structure.

[0029] Preferably, the initial defect detection system comprises a 3D scanner (not shown in the figure), which is used to scan the surface of the thin-walled cylindrical shell test piece 8 to form a real three-dimensional model of the thin-walled cylindrical shell test piece 8, and compare the real three-dimensional model with an ideal test piece three-dimensional model, the difference between the two is the geometric initial defect of the thin-walled cylindrical shell test piece 8, and the resolution can reach 0.1 mm.

[0030] The infrared thermal imaging temperature monitoring system comprises a Tianpiao Yunke I series scientific research infrared thermal imager 11, which can realize real-time monitoring of the overall temperature of the thin-walled cylindrical shell test piece 8 through a non-contact temperature measurement method, and can transmit streaming media video through Ethernet to view real-time images on a computer.

[0031] Preferably, the type of the thin-walled cylindrical shell test piece 8 includes: an unstiffened thin-walled cylindrical shell, a stiffened thin-walled cylindrical shell, a perforated thin-walled cylindrical shell, a composite unstiffened thin-walled cylindrical shell, a composite stiffened thin-walled cylindrical shell, and a composite perforated thin-walled cylindrical shell.

[0032] As a preferred embodiment, the clamping group 12 includes a ring 13, clamping ears 14, and clamping pieces 15. The fixed end plate 7 protrudes to form the ring 13. The clamping ears 14 are arranged in a uniform interval on the outer side of the ring 13. The ring 13 is spaced apart from the clamping ears 14 to clamp the thin-walled cylindrical shell test piece 8. The outer side wall of the ring 13 is adapted to slide tightly with the inner side wall of the thin-walled cylindrical shell test piece 8, so that the two can be nested and connected. The clamping pieces 15 are installed on the clamping ears 14. The clamping pieces 15 are abutted with the outer side wall of the thin-walled cylindrical shell test piece 8 through the end, so as to clamp and fix the thin-walled cylindrical shell test piece 8 on the fixed end plate 7.

[0033] As a preferred embodiment, the clamping end of the clamping piece 15 is arranged in an arc shape. The clamping piece 15 is a combination of a bolt and an arc-shaped clamping piece. The arc-shaped clamping piece can rotate relative to the bolt. The bolt is rotated inward on the clamping ear 14, and the arc-shaped clamping piece as the end is tightly abutted with the outer side wall of the thin-walled cylindrical shell test piece 8, so as to tightly clamp it from both sides. When the clamping piece 15 is installed, a torque wrench can be used to ensure that the clamping force of each direction of the clamping piece 15 on the thin-walled cylindrical shell test piece 8 is relatively uniform.

[0034] Preferably, the bottom of the counter-force frame 2 is provided with an inner cavity 18. The second pushing cylinder 19 is arranged in the inner cavity 18. The second pushing cylinder 19 is vertically arranged, and the output end is fixedly connected with the infrared heating device 9. The counter-force frame 2 and the fixed end plate 7 are provided with through holes 20 suitable for the infrared heating device 9 to pass through. The output end of the second pushing cylinder 19 is also coaxially arranged with the thin-walled cylindrical shell test piece 8 to be tested, so as to facilitate the pushing of the quartz fixed support and the infrared heating pipe group into the thin-walled cylindrical shell test piece 8, and to be coaxially arranged after being pushed into the thin-walled cylindrical shell test piece 8, so as to ensure that the heat load can be uniformly applied.

[0035] Further, the length of the infrared heating pipe group can be greater than the height of the thin-walled cylindrical shell test piece 8, so that the heat load can be uniformly applied to the test piece when the test piece of different heights is installed.

[0036] The utility model also provides a kind of test method of the torque test device of cylindrical shell, comprising the following steps:

[0037] Step S1: build loading system 1;Wherein, the various connection structures in loading system 1 can be processed and made by 310S stainless steel high-temperature-resistant steel plate to cope with high-temperature working conditions.

[0038] Step S2: The two fixed end plates 7 are clamped and installed at the upper and lower ends of the thin-walled cylindrical shell specimen 8 using the clamping assembly 12. The thin-walled cylindrical shell specimen 8 is then connected to the bottom fixed end plate 7 with bolts and installed on the reaction frame 2. The force transmission plate 6 is then adjusted to abut against the upper fixed end plate 7 using the first push cylinder 3 and fixed with bolts. Alternatively, the fixed end plates 7 can be installed on the reaction frame 2 first, and then the thin-walled cylindrical shell specimen 8 can be clamped and installed. This will not be elaborated on here.

[0039] Step S3: Measurement of initial defects: The surface of the thin-walled cylindrical shell specimen 8 is scanned using a 3D scanner to form a real three-dimensional model of the thin-walled cylindrical shell specimen 8. A specimen model without initial defects is drawn using three-dimensional drawing software and compared with the three-dimensional model of the thin-walled cylindrical shell specimen 8 obtained by scanning. The difference between the two is the geometric initial defect of the thin-walled cylindrical shell specimen 8, with a resolution of up to 0.1 mm.

[0040] Step S4: Application of thermo-mechanical coupling load: The computer-controlled rotating motor 4 is started, so that the fixed end plate 7 applies a torque load to the thin-walled cylindrical shell specimen 8; then the power of the infrared heating device 9 is adjusted to apply a thermal load to reach the high-temperature working condition; and the changes of both are recorded at the same time.

[0041] Step S5: Monitor the response of the thin-walled cylindrical shell specimen 8.

[0042] After continuously photographing and measuring the thin-walled cylindrical shell specimen 8 using the deformation measurement system 10 / three-dimensional full-field strain (DIC), the full-field strain distribution of the specimen and the spatial displacement of the preset target point are obtained based on digital image correlation technology.

[0043] Infrared thermal imager 11 is used to dynamically monitor and display the temperature field changes of the thin-walled cylindrical shell specimen 8 in real time during the test. The highest measurable temperature is 2000℃, and the thermal sensitivity is 0.03℃@+30℃.

[0044] As one implementation method, the thickness of a certain aluminum alloy thin-walled cylindrical shell t The radius of the circle is 1.5mm. r It is 300mm high. L The diameter is 800 mm. This test apparatus was used to test the critical temperature at which a thin-walled cylindrical shell buckles.

[0045] First, a 3D model of the cylindrical shell is created using a 3D scanner to obtain the initial geometric defects of the shell, which are then saved for subsequent research. Second, a deformation measurement system 10 / 3D full-field strain and infrared thermal imaging temperature monitoring system, including a DIC, an infrared thermal imager 11, and accompanying analysis software, is used.

[0046] Then the computer control rotating motor 4 is loaded step by step until the predetermined torque load is reached, and is kept constant. Further, a variable thermal load is applied, the temperature control software is set to a heating rate of 0.5℃ / s, and both changes are monitored in real time.

[0047] During the test, DIC and infrared thermal imager 11 are used to record the overall strain displacement data and temperature change of the cylindrical shell during the test. When the cylindrical shell structure appears buckling and rapidly deforms to lose load bearing capacity, heating and mechanical load are stopped, that is, the high-temperature torsion constant load heating test of the thin-walled cylindrical shell is completed, and finally the data is analyzed and relevant conclusions are drawn.

[0048] The above only describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A torque testing device for a cylindrical shell, characterized by, The loading system, the temperature increasing and constant temperature system, the deformation measurement system, the initial defect detection system and the infrared thermal image temperature monitoring system are comprised. The loading system comprises a counterforce frame, a first pushing cylinder, a rotating motor, a spline shaft, a force transmission plate and fixed end plates; the counterforce frame is in the shape of a Chinese character; the first pushing cylinder is fixed on the upper end of the counterforce frame, and the output end is connected with the rotating motor for controlling the rotating motor to move in the axial direction; the output end of the rotating motor is vertically downward arranged and fixedly connected with the upper end of the spline shaft, and the force transmission plate is coaxially fixed on the lower end of the spline shaft; the two fixed end plates are symmetrically arranged at the two ends of the thin-walled cylindrical shell specimen, and the side of the fixed end plate close to the thin-walled cylindrical shell specimen is annularly provided with a clamping group for mounting and fixing the thin-walled cylindrical shell specimen; the fixed end plate above the thin-walled cylindrical shell specimen is fixedly connected with the bottom of the force transmission plate through bolts, and the fixed end plate below the thin-walled cylindrical shell specimen is fixedly connected with the counterforce frame through bolts; the rotating motor is mounted in a mounting seat; the counterforce frame is provided with a sliding groove, the two sides of the sliding groove are symmetrically concave and provided with guide grooves, the mounting seat is slidably connected with the sliding groove, the two sides of the mounting seat are protrudingly provided with protrusions, and the protrusions are slidably connected with the guide grooves; and the first pushing cylinder is arranged above the sliding groove. When the thin-walled cylindrical shell specimen is clamped and fixed on the loading system through the clamping group, the thin-walled cylindrical shell specimen is coaxially arranged with the output shaft of the rotating motor, the rotation of the rotating motor is controlled, and then the thin-walled cylindrical shell specimen is subjected to a torsional load. The temperature increasing and constant temperature system comprises an infrared heating device and temperature control software, and the infrared heating device is arranged in the interior of the thin-walled cylindrical shell specimen to increase the temperature of the thin-walled cylindrical shell specimen. The deformation measurement system is used for measuring the full-field strain distribution of the thin-walled cylindrical shell specimen and the spatial displacement of a preset target point. The initial defect detection system comprises a 3D scanner, which is used for scanning the surface of the thin-walled cylindrical shell specimen to form a real three-dimensional model of the thin-walled cylindrical shell specimen, and comparing the real three-dimensional model with an ideal three-dimensional model of the specimen to obtain the geometric initial defect of the thin-walled cylindrical shell specimen. The infrared thermal image temperature monitoring system comprises a Tianpiao Yunke I series scientific research infrared thermal imager, which can realize real-time monitoring of the global temperature of the thin-walled cylindrical shell specimen through a non-contact temperature measurement method, and can transmit streaming media video through Ethernet to view real-time images on a computer.

2. A torque test apparatus for a cylindrical shell as defined in claim 1, characterized in that The types of the thin-walled cylindrical shell specimen include an unstiffened thin-walled cylindrical shell, a stiffened thin-walled cylindrical shell, a perforated thin-walled cylindrical shell, a composite unstiffened thin-walled cylindrical shell, a composite stiffened thin-walled cylindrical shell and a composite perforated thin-walled cylindrical shell.

3. A torque test apparatus for a cylindrical shell as defined in claim 1, wherein The clamping group comprises a ring, clamping ears and a clamping piece, the clamping ears are arranged in a circle and uniformly spaced on the outside of the ring, and the outside wall of the ring is adapted to slide closely with the inside wall of the thin-walled cylindrical shell specimen; the clamping piece is installed on the clamping ear, and the clamping piece is abutted with the outside wall of the thin-walled cylindrical shell specimen through the end, so as to clamp and fix the thin-walled cylindrical shell specimen on the fixed end plate.

4. A torque test apparatus for a cylindrical shell as defined in claim 3, wherein The clamping end of the clamping piece is arranged in an arc shape.

5. The torque testing apparatus for a cylindrical shell as defined in claim 1, wherein The bottom of the counterforce frame is provided with an inner cavity, the inner cavity is provided with a second push cylinder, the second push cylinder is vertically arranged, and the output end is fixedly connected with the infrared heating device, and the counterforce frame and the fixed end plate are provided with through holes suitable for the infrared heating device to pass through.

6. A torque test apparatus for a cylindrical shell as defined in claim 1, wherein The infrared heating device comprises a quartz fixed support and an infrared heating pipe group, and the infrared heating pipe group is arranged in a circumferential array on the upper end of the quartz fixed support.

7. A torque test apparatus for a cylindrical shell as defined in claim 1, wherein The deformation measurement system comprises a high-speed camera and digital image analysis software, is used for measuring the full-field strain distribution of the thin-walled cylindrical shell specimen and the spatial displacement of the preset target point, can capture the load-strain curve and deformation trajectory curve of each point of the thin-walled cylindrical shell specimen, and calculate the mechanical performance parameters, so as to provide deformation and mechanical data for the test and analysis of the structure.

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