A critical property testing device for superconducting tapes in a polygonal mode

Abstract

The present invention discloses a critical property testing device for superconducting tapes in a multi-deformation mode. The device includes: a framework support and a vacuum chamber composed of upper and lower layers, an adjustable tension component passing through the upper and lower layers of the framework support and the vacuum chamber and extending downward to the cryogenic test layer, a tape clamping tooling fixedly connected to the bottom end of the adjustable tension component, and current lead terminals arranged on the superconducting tape to be tested. By dividing the testing device into common parts, non-common parts, fixed structures, and non-fixed structures, the present invention realizes stress adjustment in a multi-deformation mode through the same transmission device, eliminates the interference factors in the superimposed stress by setting an axisymmetric structure and comparing and observing the stress difference between the superconducting tape without loaded current and the superconducting tape with loaded current during the loading process of the critical current of the tape, and improves the accuracy of stress testing.

Description

Technical Field

[0001] The present invention relates to the field of critical property testing of superconducting tapes, and particularly to a critical property testing device for superconducting tapes in a multi-deformation mode. Background Art

[0002] Since the Dutch physicist Heike Kamerlingh Onnes discovered the superconducting properties of "zero resistance" and "Meissner effect" of mercury at low temperature in 1911, it has shown attractive application prospects. At present, superconducting materials and related technologies are being increasingly applied in many fields such as scientific research, transportation, electric power, energy, biomedicine, national defense and military. However, due to the constraints of the extremely low-temperature working environment, high costs, and the problem of supply of core raw materials, the application of low-temperature superconductivity is facing increasingly significant crises and challenges. In recent years, with the further acceleration of the practical application process of high-temperature superconducting tapes, many high-tech companies, research institutions, and university laboratories around the world have successively carried out research on the testing and winding of high-temperature superconducting tapes.

[0003] Engineering practice and research have shown that when high-temperature superconducting materials are under external mechanical pressure or deformation, changes in critical properties will occur, mainly manifested as the degradation phenomenon of the critical current Ic, and even the loss of superconducting properties. It can be seen that the properties of high-temperature superconducting materials are not only affected by their physical properties, but also significantly affected by their mechanical properties. In practical applications, they are inevitably subject to other types of loads such as external mechanical loads, electromagnetic force loads, and temperature disturbances. Therefore, studying the mechanical problems of superconducting tapes under extreme environmental conditions is directly related to the safe design and stable operation of high-temperature superconducting magnets, and there is an urgent need to develop corresponding test platforms and evaluation methods that can provide extreme multi-field environments and characterize the thermal, electromagnetic, and mechanical macro-micro properties of high-temperature superconducting electromagnetic materials.

[0004] The existing stress testing device for superconducting tapes, as Figure 8 shown, has one of the problems: it cannot adjust the stress online. The traditional method is to pre-adjust the deformation stress in a room-temperature environment: paste the tape on the upper surface of the crossbeam, and increase the distance between the two fulcrums on the left and right of the crossbeam by rotating the bidirectional lead screw nut between the two sides of the crossbeam, so as to apply tensile stress to the tape. The disadvantage is that once the deformation stress is adjusted and then placed in a cryogenic environment for testing, the stress cannot be adjusted online during the testing process. Because the same mechanism, the crossbeam, is used to carry the tape and the bidirectional lead screw adjusting nut. Among them, the manual adjustment of stress deformation can only be carried out in a normal-temperature environment, and the superconducting tape testing can only be carried out in a cryogenic environment. Since it is the same mechanism and cannot be disassembled, the traditional method cannot adjust the stress online while testing. Its second problem is that it cannot achieve multi-deformation mode testing of bending, stretching, and torsion in the same transmission mechanism device, as Figure 8The method using a bidirectional lead screw to adjust the nut shown is limited to tensile and bending tests and cannot achieve torsional tests. To achieve torsional tests, another transmission mechanism must be used. The third problem it has is that the disturbance error of thermal stress cannot be eliminated in stress tests. When an electric current is applied to the strip, thermal stress will be generated. At this time, the stress acting on the superconducting strip is the superimposed stress. For example, when testing the bending stress of a superconducting strip, due to the applied current, the read stress contains the interference factor of thermal stress. However, because they are superimposed together, the error caused by thermal stress cannot be eliminated. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a critical characteristic test device for superconducting strips in multi-deformation modes. One of the purposes is to solve the problem that the stress cannot be adjusted online by the traditional method. Another purpose is to solve the problem that multi-deformation mode tests cannot be carried out in the same transmission mechanism device. The third purpose is to solve the problem that the disturbance error of thermal stress cannot be eliminated in stress tests.

[0006] The present invention adopts the following technical solutions to solve its technical problems:

[0007] A critical characteristic test device for superconducting strips in multi-deformation modes, characterized in that: the device includes: a frame support and a vacuum chamber 1 composed of upper and lower layers, an adjustable tension member 2 passing through the upper and lower layers of the frame support and the vacuum chamber 1 and extending downward to the cryogenic test layer, a strip clamping tooling 3 fixedly connected to the bottom end of the adjustable tension member 2, and current lead terminals 4 arranged on the superconducting strip to be tested; as Figure 7 shown, for the frame support and the vacuum chamber 1, its upper layer is at room temperature and is used for the adjustable tension member 2 to adjust the stress online in the room temperature environment; its lower layer is in a vacuum environment and is provided with a vacuum chamber, and the vacuum chamber is used to isolate hot air; the strip clamping tooling 3 includes a fixed clamping member 3-1 and a replaceable clamping member. The replaceable clamping member includes a replaceable bending tooling clamping member 3-2 and a replaceable tensile and torsional tooling clamping member 3-3. Through the combined device of different clamping members, various deformation modes of stretching, bending, and torsion of the strip can be achieved; the replaceable tensile and torsional tooling clamping member 3-3 adopts an axisymmetric device 3-1, 3-3-2 that can eliminate the interference of non-reference stress. When the axisymmetric device 3-1, 3-3-2 performs tensile or torsional strip tests, two strips are respectively fixed on the test device. One strip is a reference strip, and the reference strip is used to test the reference stress. The other strip is a non-reference strip, and the non-reference strip is used to test the superimposed stress. The interference of the non-reference stress includes the interference of thermal stress.

[0008] The adjustable tension component 2 includes upper, middle and lower layers. The upper layer corresponds to the room temperature environment of the skeleton support and the vacuum chamber 1, and the middle layer corresponds to the vacuum environment of the skeleton support and the vacuum chamber 1. The upper layer is provided with an adjusting nut 2-2 and a pressure sensor 2-3. The middle layer is provided with a metal bellows 2-4. The upper and middle layers share a stainless steel adjustable screw rod 2-1. The lower layer is provided with a G10 pull rod 2-5. The adjustable tension component 2 realizes stress loading on the strip by rotating the adjusting nut 2-3 to change the stroke of the adjustable screw rod 2-1, and obtains the tension borne by the strip by reading the change of the pressure sensor 2-2. The pressure borne by the strip is δ = F / A, where δ: stress; F: tension; A: cross-sectional area of the strip.

[0009] The fixed clamping component 3-1 is fixedly connected to the G10 pull rod one 2-5-1 and the G10 pull rod two 2-5-2 respectively through bolts, and moves up and down together with the adjustable tension rod during the stress loading process.

[0010] The replaceable bending tooling clamping component 3-2 and the replaceable stretching and torsion tooling clamping component 3-3 can be respectively fixed on the G10 pull rod three 2-5-3, and can realize clamping of the strip in different ways.

[0011] The curvatures of the curvature cylinder 3-2-2 include 5mm, 10mm, 12mm, 15mm, and 20mm.

[0012] The angles of the stretching and torsion pressing block one 3-3-1 include 0 degrees, 5 degrees, 10 degrees, 15 degrees, and 20 degrees; by changing the angle of the guiding groove, different torsion angles of the strip can be loaded, and the angle of the guiding groove is 0 0 When it is, the strip only bears tensile stress.

[0013] The replaceable bending tooling clamping component 3-2 includes a cylindrical bracket 3-2-1 and different curvature support cylinders 3-2-2. The cylindrical bracket 3-2-1 is fixed on the G10 pull rod 2-5-3, and the support cylinder 3-2-2 is placed on the cylindrical bracket 3-2-1. The strip can realize the test of critical characteristics under different bending radii by bypassing different curvature support cylinders 3-2-2.

[0014] Advantages and effects of the present invention

[0015] 1. In the present invention, the adjustable tension component 2 is divided into upper, middle and lower layers, and the upper, middle and lower layers support and depend on each other: both the upper and lower layers cannot do without the vacuum chamber in the middle layer, otherwise the upper and lower layers cannot isolate the hot air and cannot achieve the effect of online adjustment; the middle layer also cannot do without the support of the upper and lower layers. Without the upper and lower layers, the vacuum pumping of the middle layer loses its meaning. After combination, much more superior effects are produced compared with before combination, and online adjustable stress testing is realized.

[0016] 2. By dividing the test device into common parts, non-common parts, fixed structures and non-fixed structures in the common parts, and fixed structures and non-fixed structures in the non-common parts, the present invention realizes stress adjustment in multiple deformation modes through the same transmission device. It improves from the prior art where each type of tooling is only for stress testing of one mode to realizing at least more than a dozen stress tests through the same tooling, achieving a leap from quantitative change to qualitative change.

[0017] 3. By setting an axisymmetric structure and comparing and observing the stress difference between the superconducting tape without applied current and the superconducting tape with applied current during the loading process of the critical current of the tape, the present invention finds the error value caused by thermal stress disturbance, thereby eliminating the interference factors in the superimposed stress and improving the accuracy of stress testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the overall structure diagram of the multi-deformation mode - bending deformation test device of the invention;

[0019] Figure 2 It is the structure diagram of the adjustable tension component G10 pull rod of the invention;

[0020] Figure 3 It is the structure diagram of the replaceable bending tooling clamping component of the invention;

[0021] Figure 4 It is the overall structure diagram of the multi-deformation mode - tensile torsion test device of the invention;

[0022] Figure 5 It is the three-dimensional diagram of the replaceable tensile torsion tooling clamping component of the invention;

[0023] Figure 6 It is the top view of the replaceable tensile torsion tooling clamping component of the invention;

[0024] Figure 7 Skeleton support and vacuum chamber;

[0025] Figure 8 Superconducting tape stress test device of the traditional method;

[0026] Figure 9 Flow chart of the critical characteristic test method of the present invention;

[0027] 1: Skeleton support and vacuum chamber; 1-1: Vacuum chamber; 2: Adjustable tension component; 2-1: Adjustable screw rod; 2-2: Adjusting nut; 2-3: Pressure sensor; 2-4: Metal bellows; 2-5: G10 pull rod; 2-5-1: G10 pull rod one; 2-5-2: G10 pull rod two; 2-5-3: G10 pull rod three; 3: Strip clamping tooling; 3-1: Fixed clamping component; 3-2: Replaceable bending tooling clamping component; 3-2-1: Cylindrical bracket; 3-2-2: Support cylinders with different curvatures; 3-3: Replaceable stretching and torsion tooling clamping component; 3-3-1: Stretching and torsion pressing block one; 3-3-2: Stretching and torsion pressing block two; 4: Current lead. Detailed implementation manners

[0028] The following further explains the present invention in conjunction with the accompanying drawings:

[0029] Design principle of the present invention

[0030] 1. Design principle of online adjustable stress. The key issue of online stress adjustment is to arrange the components of the adjustable tension component 2 that operate at normal temperature and those that operate at ultra-low temperature in different temperature environments respectively. Specifically: arrange the adjustable screw rod 2-1, adjusting nut 2-2, and pressure sensor 2-3 in the normal temperature environment; arrange G10 pull rod one, G10 pull rod two, and G10 pull rod three in the ultra-low temperature environment; however, in this case, if the sealing at the joint between the components operating at normal temperature and those operating at ultra-low temperature is not good, hot gas leakage will occur. To solve the problem of hot gas leakage at the joint of the two parts, the adjustable tension component of the present invention is divided into upper, middle, and lower sections, and a vacuum chamber is added in the middle section to isolate hot gas.

[0031] 2. Design principle of using the same transmission mechanism to achieve polygon testing: The first key point is to divide the testing device into common parts and non-common parts. Among the three main components, there are two common parts: the skeleton support and vacuum chamber 1, and the adjustable tension component 2, and the non-common part is the strip clamping tooling 3; the second key point is to divide the non-common strip clamping tooling 3 into a fixed clamping component 3-1 and variable clamping components 3-2, 3-3; the third key point is to divide the common adjustable tension component 2 into a fixed G10 pull rod 2-5-3 and movable G10 pull rod one 2-5-1, G10 pull rod two 2-5-2; the fixed G10 pull rod three 2-5-3 corresponds to the variable clamping components 3-2, 3-3 of the strip clamping tooling 3, and the movable G10 pull rod one and G10 pull rod two correspond to the superconducting strip. In short, on a large scale, it is divided into common components and non-common components, and on a small scale, among the common components, it is divided into fixed components and movable components, and among the non-common components, it is also divided into fixed components and movable components.

[0032] 3. Design principle for eliminating thermal stress interference factors. First, testing interference factors is a requirement for practical applications. The testing device of the present invention is designed to test the critical current. Applying stress only adds an environment in practical applications where stress exists in reality. In practical applications, the stress on the strip should be the superimposed stress, which includes not only the thermal stress of the current but also the mechanical stress. Second, the testing interference factors are limited to tensile and torsional tests. Bending tests cannot be conducted on the entire strip, and only when there are two strips can the reference stress of one strip and the superimposed stress of the other strip be measured. Third, the axisymmetric device takes the adjustable screw rod 2-1 and the G10 pull rod three 2-5-3 as the axis, and on both sides of them, G10 pull rod one 2-5-1, G10 pull rod two 2-5-2 of the same length, strips of the same length, and the tensile and torsional compression blocks two 3-3-2 arranged opposite to each other are symmetrically provided from top to bottom in sequence. Fourth, stress gauges are respectively attached to the two strips on the left and right, and the stress gauges are used to read the stress received by the strips. Fourth, during the loading process of the critical current of the strip, the stress difference between the superconducting strip without the applied current and the superconducting strip with the applied current is compared and observed, and the difference is mainly caused by the perturbation of the thermal stress.

[0033] Based on the above principles, the present invention relates to a testing device for the critical characteristics of superconducting strips in a multi-deformation mode.

[0034] A testing device for the critical characteristics of superconducting strips in a multi-deformation mode is as Figure 1 、 Figure 7 shown, and it is characterized in that: the device includes: a frame support and a vacuum chamber 1 composed of upper and lower layers, an adjustable tension component 2 passing through the upper and lower layers of the frame support and the vacuum chamber 1 and extending downward to the cryogenic test layer, a strip clamping tooling 3 fixedly connected to the bottom end of the adjustable tension component 2, and current lead terminals 4 arranged on the superconducting strip to be tested; as Figure 7 shown, for the frame support and the vacuum chamber 1, its upper layer is at room temperature and is used for the adjustable tension component 2 to adjust the stress online in the room temperature environment; its lower layer is in a vacuum environment and is provided with a vacuum chamber, and the vacuum chamber is used to isolate the hot air; as Figures 2 - 6As shown in the figure, the strip clamping tooling 3 includes a fixed clamping component 3-1 and a replaceable clamping component. The replaceable clamping component includes a replaceable bending tooling clamping component 3-2 and a replaceable stretching and torsion tooling clamping component 3-3. Through the combined device of different clamping components, various deformation modes of stretching, bending, and torsion of the strip can be realized. The replaceable stretching and torsion tooling clamping component 3-3 adopts an axisymmetric device 3-1, 3-3-2 that can eliminate the interference of non-reference stress. When the axisymmetric device 3-1, 3-3-2 conducts tensile or torsional tests on the strip, two strips are respectively fixed on the test device. One strip is the reference strip, which is used to test the reference stress, and the other strip is the non-reference strip, which is used to test the superimposed stress. The interference of the non-reference stress includes the interference of thermal stress.

[0035] The adjustable tension component 2 is as Figure 1 shown, including upper, middle, and lower layers. The upper layer corresponds to the room temperature environment of the skeleton support and the vacuum chamber 1, the middle layer corresponds to the vacuum environment of the skeleton support and the vacuum chamber 1. The upper layer is provided with an adjusting nut 2-2 and a pressure sensor 2-3. The middle layer is provided with a metal bellows 2-4. The upper layer and the middle layer share a stainless steel adjustable screw rod 2-1. The lower layer is provided with a G10 pull rod 2-5. The adjustable tension component 2 realizes stress loading on the strip by rotating the adjusting nut 2-2 to change the stroke of the adjustable screw rod 2-1. By reading the change of the pressure sensor 2-3, the tension borne by the strip is obtained. The pressure borne by the strip is δ = F / A, where δ: stress; F: tension; A: cross-sectional area of the strip.

[0036] The fixed clamping component 3-1 is respectively fixedly connected to the G10 pull rod one 2-5-1 and the G10 pull rod two 2-5-2 through bolts, and it moves up and down with the adjustable tension rod during the stress loading process.

[0037] As Figure 1 shown, the third layer of the adjustable tension component 2 is provided with 3 G10 pull rods. The middle one is the G10 pull rod three 2-5-3, and the two sides are the G10 pull rod one 2-5-1 and the G10 pull rod two 2-5-2. The G10 pull rod one 2-5-1 and the G10 pull rod two 2-5-2 on both sides are connected to the stainless steel adjustable screw rod 2-1. The middle G10 pull rod three 2-5-3 is fixed and not connected to the stainless steel adjustable screw rod 2-1. When the adjusting nut 2-2 is rotated, the G10 pull rod one 2-5-1 and the G10 pull rod two 2-5-2 move up and down with the metal bellows 2-4. Since the strip is fixed at the ends of the G10 pull rod one 2-5-1 and the G10 pull rod two 2-5-2, the strip also moves up and down with the metal bellows.

[0038] As Figure 4 、 Figure 5 、 Figure 6As shown, the replaceable bending tooling clamping component 3-2 and the replaceable stretching and torsion tooling clamping component 3-3 can be respectively fixed on the G10 pull rod three 2-5-3, and different clamping methods for the strip can be achieved.

[0039] The curvatures of the curvature cylinder 3-2-2 include 5mm, 10mm, 12mm, 15mm, and 20mm.

[0040] The angles of the first stretching and torsion pressing block 3-3-1 include 0 degrees, 5 degrees, 10 degrees, 15 degrees, and 20 degrees; by changing the angle of the guiding groove, different torsion angles can be loaded on the strip. When the angle of the guiding groove is 0 0 , the strip only bears tensile stress.

[0041] The described replaceable bending tooling clamping component 3-2 includes a cylindrical bracket 3-2-1 and different curvature support cylinders 3-2-2. The cylindrical bracket 3-2-1 is fixed on the G10 pull rod 2-5-3, and the support cylinder 3-2-2 is placed on the cylindrical bracket 3-2-1. The strip bypasses the different curvature support cylinders 3-2-2 to achieve the test of critical characteristics under different bending radii.

[0042] The present invention designs a method for testing the critical characteristics of a superconducting strip in a multi-deformation mode by applying the above test device.

[0043] It is characterized in that the test method includes the following steps:

[0044] Step 1: Select the multi-deformation mode of the superconducting strip to be measured currently. The multi-deformation mode includes a bending deformation mode, and a stretching and twisting deformation mode;

[0045] Step 2: If the bending deformation mode is selected, further select the curvature specification of the replaceable bending tooling clamping component 3-2, fix the replaceable bending tooling clamping component 3-2 that meets the current specification at the lower end of the G10 pull rod three 2-5-3, and select an appropriate length of a whole strip for the critical test of bending deformation and perform online stress adjustment; if the stretching and twisting deformation mode is selected, further select the stretching and torsion angle specifications of the replaceable stretching and torsion tooling clamping component 3-3, fix the replaceable stretching and torsion tooling clamping component 3-3 that meets the angle specification at the lower end of the G10 pull rod three 2-5-3, and select two strips with appropriate lengths for the critical test of stretching and twisting deformation. One strip is a reference strip, which is used to test the reference stress, and the other strip is a non-reference strip, which is used to test the superimposed stress, and perform online stress adjustment;

[0046] The specific process of the critical test for bending deformation is as follows:

[0047] 1) Select the replaceable bending tooling clamping component 3-2, and select the curvature cylinder 3-2-2 with an appropriate bending diameter. The curvatures of the curvature cylinder 3-2-2 include 5 mm, 10 mm, 12 mm, 15 mm, and 20 mm;

[0048] 2) Cut a superconducting tape with a length of 24-28 cm, wipe the surface of the superconducting tape with materials such as alcohol and non-woven fabric, paste a cryogenic strain gauge at an appropriate position, and weld the voltage leads;

[0049] 3) Fix the pretreated tape on the fixed clamping component 3-1 and the stretching and torsion clamping component 3-2;

[0050] 4) Connect the critical property testing device to the cryostat, lead out the current leads, strain test leads, voltage leads, etc., and evacuate the critical property testing device and the cryostat;

[0051] 5) Until the vacuum is better than 5×10-3 Pa, turn on the refrigerator to cool down, and cooperate with the heating sheet to stabilize the refrigerator at a constant temperature, apply the critical current and stress of the superconducting tape, and record the voltage signal on the superconducting tape in real time to judge whether it quenches;

[0052] 6) Until the superconducting tape quenches, record the current I, voltage V, tensile force, and strain, obtain the superconducting critical property parameters, and then reheat to complete the test;

[0053] 7) Adjust the bending stress online: Read the data on the strain gauge. If the stress does not meet the requirements, manually adjust the adjusting nut 2-2 until the bending stress reaches the set requirements.

[0054] The specific process of the critical test for tensile and torsional deformation is as follows:

[0055] 1) Select the replaceable stretching and torsion tooling clamping component 3-3, and select the stretching and torsion pressing block 1 3-3-1 with an appropriate angle. The angles of the stretching and torsion pressing block 1 include 0°, 5°, 10°, 15°, and 20°;

[0056] 2) Cut two superconducting tapes with a length of 12-16 cm, wipe the surface of the superconducting tapes with materials such as alcohol and non-woven fabric, paste cryogenic strain gauges at appropriate positions, and weld the voltage leads;

[0057] 3) Fix the two pretreated tapes on the respective fixed clamping parts 3-1, stretching and torsion pressing block 1 3-3-1, and stretching and torsion pressing block 2 3-3-2 on both sides of the axis in an axisymmetric manner;

[0058] 4) Connect the critical property testing device to the cryostat, and connect the current lead-out wire, voltage lead wire to one of the superconducting tapes, strain test wire, etc., and evacuate the critical property testing device and the cryostat;

[0059] 5) Until the vacuum is better than 5×10-3 Pa, start the refrigerator to cool down, and cooperate with the heating sheet to stabilize the refrigerator at a constant temperature, apply the critical current and stress of the superconducting tape, and record the voltage signal on the superconducting tape in real time to judge whether it quenches;

[0060] 6) During the loading process of the critical current of the tape, compare and observe the stress difference between the superconducting tape without loading current and the superconducting tape with loading current. The difference is mainly caused by the disturbance of thermal stress;

[0061] 7) Adjust the tensile and torsional stresses online: Read the data on the strain gauges of each tape. If the tensile and torsional stresses do not meet the requirements, manually adjust the adjusting nut 2-2 until the tensile and torsional stresses reach the set requirements.

[0062] 8) Until the superconducting tape quenches, record the current I, voltage V, tensile force, and strain, obtain the superconducting critical property parameters, and then reheat to complete the test.

[0063] It should be emphasized that the above specific embodiments are only explanations of the present invention, and they are not limitations of the present invention. Those skilled in the art can make modifications to the above embodiments without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A critical property testing device for a superconducting tape in a polygon mode, characterized in that: The device includes: a framework support and a vacuum chamber (1) composed of upper and lower layers, an adjustable tension component (2) passing through the upper and lower layers of the framework support and the vacuum chamber (1) and extending downward to the cryogenic test layer, a strip clamping tooling (3) fixedly connected to the bottom end of the adjustable tension component (2), and current lead terminals (4) arranged on the superconducting strip to be tested; for the framework support and the vacuum chamber (1), its upper layer is at room temperature and is used for the adjustable tension component (2) to adjust the stress online in the room temperature environment; its lower layer is in a vacuum environment and is provided with a vacuum chamber, and the vacuum chamber is used to isolate the hot air; the strip clamping tooling (3) includes a fixed clamping component (3-1) and a replaceable clamping component. The replaceable clamping component includes a replaceable bending tooling clamping component (3-2) and a replaceable stretching and torsion tooling clamping component (3-3). Through the combined device of different clamping components, various deformation modes of stretching, bending, and torsion of the strip can be realized; the replaceable stretching and torsion tooling clamping component (3-3) adopts an axisymmetric device capable of eliminating non-reference stress interference. The axisymmetric device includes a stretching and torsion pressing block one (3-3-1) and a stretching and torsion pressing block two (3-3-2). When the axisymmetric device conducts stretching or torsion tests on the strip, two strips are respectively fixed on the test device. One strip is a reference strip for testing the reference stress, and the other strip is a non-reference strip for testing the superimposed stress.

2. The critical property testing device for a superconducting tape in a polygon mode according to claim 1, characterized in that: The non-reference stress interference mentioned above includes the interference of thermal stress.

3. The critical property testing device for a superconducting tape in a polygon mode according to claim 1, wherein: The adjustable tension component (2) includes upper, middle, and lower layers. The upper layer corresponds to the room temperature environment of the framework support and the vacuum chamber (1), and the middle layer corresponds to the vacuum environment of the framework support and the vacuum chamber (1). The upper layer is provided with an adjusting nut (2-2) and a pressure sensor (2-3), the middle layer is provided with a metal bellows (2-4), the upper and middle layers share a stainless steel adjustable screw rod (2-1), and the lower layer is provided with a G10 pull rod (2-5). The adjustable tension component (2) realizes the stress loading on the strip by rotating the adjusting nut (2-2) to change the stroke of the adjustable screw rod (2-1), and obtains the tension borne by the strip by reading the change of the pressure sensor (2-3). The pressure borne by the strip is δ = F / A, where δ: stress; F: tension; A: cross-sectional area of the strip.

4. The critical property testing device for a superconducting tape in a polygon mode according to claim 3, wherein: The third layer of the adjustable tension member (2) is provided with three G10 (2-5) tie rods. In the middle is the G10 tie rod three (2-5-3), and on both sides are the G10 tie rod one (2-5-1) and the G10 tie rod two (2-5-2). The G10 tie rod one (2-5-1) and the G10 tie rod two (2-5-2) on both sides are connected to the stainless steel adjustable lead screw (2-1). The middle G10 tie rod three (2-5-3) is fixed and not connected to the stainless steel adjustable lead screw (2-1). When the adjusting nut (2-2) is rotated, the G10 tie rod one (2-5-1) and the G10 tie rod two (2-5-2) move up and down along with the metal bellows (2-4). Since the strip is fixed at the ends of the G10 tie rod one (2-5-1) and the G10 tie rod two (2-5-2), the strip also moves up and down along with the metal bellows (2-4).

5. The critical property testing device for a superconducting tape in a polygon mode according to claim 1, wherein: The described fixed clamping member (3-1) is fixedly connected to the G10 tie rod one (2-5-1) and the G10 tie rod two (2-5-2) respectively through bolts, and moves up and down together with the adjustable tension rod during the stress loading process.

6. The critical property testing device for a superconducting tape in a polygon mode according to claim 1, characterized in that: The described replaceable bending tooling clamping member (3-2) and the replaceable stretching and torsion tooling clamping member (3-3) can be respectively fixed on the G10 tie rod three (2-5-3) to realize clamping of the strip in different ways.

7. The critical property testing device for a superconducting tape in a polygonal mode according to claim 6, characterized in that: The angles of the stretching and twisting pressing block one (3-3-1) include 0°, 5°, 10°, 15°, 20°; by changing the angle of the guiding groove, different twisting angles of the strip can be loaded, where the angle of the guiding groove is 0 0 When it is, the strip only bears tensile stress.

8. The critical property testing device for a superconducting tape in a polygon mode according to claim 6, wherein: The described replaceable bending tooling clamping member (3-2) includes a cylindrical bracket (3-2-1) and support cylinders with different curvatures (3-2-2). Among them, the cylindrical bracket (3-2-1) is fixed on the G10 tie rod (2-5-3), and the support cylinders with different curvatures (3-2-2) are placed on the cylindrical bracket (3-2-1). The strip bypasses the support cylinders with different curvatures (3-2-2) to realize the test of critical characteristics under different bending radii.

9. The critical property testing device for a superconducting tape in a polygon mode according to claim 8, characterized in that: The curvatures of the support cylinders with different curvatures (3-2-2) include 5mm, 10mm, 12mm, 15mm, and 20mm.

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