A device for film prestress loading and irradiation testing

Abstract

The present invention relates to the field of aerospace materials, and in particular to a device for prestressed loading and irradiation testing of thin films; the device comprises a frame, a support block, an anvil, and a pressure gauge; the support block, the anvil and the pressure gauge can all move up and down inside the frame; the thin film material to be tested is fixed to the frame by a pressure plate, and the position of the anvil inside the frame can be changed by adjusting the support screws, thereby adjusting the size of the external force applied by the anvil; the present invention can provide forces of different sizes and directions to the thin film by replacing different anvils, and the external force applied to the thin film material to be tested is complex, changeable and detectable; at the same time, the cooperation between the frame, the support block and the screws is utilized to avoid the anvil from shifting during the irradiation process, resulting in changes in the applied external force and relaxation of the thin film material; the invention has the advantages of small size, simple operation, long-lasting and stable prestress, and is particularly suitable for irradiation tests in narrow irradiation spaces.

Description

Technical Field

[0001] The invention relates to the field of aerospace materials, and in particular to a device for film prestress loading and irradiation testing. Background Art

[0002] Thin film materials used in aerospace need to withstand the rigorous test of the space environment. Take solar sails as an example: the sail surface of a solar sail is made of ultra-light and thin film materials. However, the sail surface material is exposed to the space environment for a long time and is affected by space particle radiation. Its performance will degrade, affecting its application in the space environment.

[0003] With the development of aerospace vehicles, the requirements for aerospace materials have become more numerous, higher and newer. In the research and development process of new thin film materials, a series of research and tests are needed to study the mechanism of interaction between space particles and thin films, the changes in the performance of thin film materials after space particle irradiation, etc., in order to detect whether they can meet the requirements of the space environment.

[0004] The performance tests of thin film materials mainly include mechanical properties, dielectric properties, high and low temperature resistance, radiation resistance, etc. At present, researchers have done a lot of research on the performance changes of composite thin film materials under irradiation conditions. The main testing method is to give the thin film material a certain dose of irradiation and then detect its performance changes. The method adopted by some researchers is irradiation and stress coupling treatment, that is, irradiating the thin film material under the condition of applying a tensile force in one direction, and then testing the changes in the performance of the thin film material after irradiation.

[0005] However, during the deployment of aerospace vehicles (such as solar sails), the film material on the surface is not only subjected to forces in a single direction. Films at different locations may be subjected to external forces of different magnitudes and directions. The current test method is to test the results of plane stretching, and the calculation formula is P = F / S, where F is the magnitude of the tensile force in the plane direction, S is the area of ​​the cross-section of the stretched film, and P is the tensile force per unit cross-sectional area. The existing prestressed loading irradiation test device has the following three main limitations: (1) The stress loading device is large in size, and the internal space of the irradiation test device is often limited, which cannot meet the test requirements; (2) During the irradiation process, the film material often deforms, the stress condition changes, and it is even in a relaxed state without stress, which cannot well simulate the use scenario of continuous stress; (3) The stress loading form is relatively simple, mainly tensile stress, which is quite different from the actual complex use scenario. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing film material prestressed radiation coupling test device and provide a film prestressed loading and radiation test device.

[0007] To achieve the above object, the present invention provides a technical solution: a device for film prestressing loading and irradiation testing, characterized in that it at least comprises:

[0008] A frame, the frame comprising an overall frame of a cubic structure, a pressing plate, supporting screws and fixing screws at the bottom, a screw hole is provided at the top of the frame, the top screw cooperates with the pressing plate, and the overall frame of the cubic structure is a hollow structure;

[0009] A support block, the support block is arranged inside the frame, and its size matches the inner size of the frame. By adjusting the support screw, the support block can be moved up and down inside the frame without deviation;

[0010] Anvils, the anvils include anvil 1, anvil 2, and anvil 3, the anvils are arranged above the support block, the cylindrical part of the anvils cooperates with the placement hole of the support block, and can move up and down inside the frame without deviation; wherein the force-applying part of the anvil 1 is spherical, which can apply forces from different directions on the spherical surface to the film, the anvil 2 can provide tension in the horizontal direction after the film is fixed, the force-applying part of the anvil 3 is a semi-cylinder, which can provide force from the side direction of the cylinder, the three anvils provide external forces at different angles and directions, and the magnitude of the force can be adjusted by adjusting the support screws;

[0011] A pressure gauge, which is a cylindrical structure and is disposed below the support block. The placement hole of the support block cooperates with the pressure gauge, and the pressure gauge can be moved up and down inside the frame by adjusting the support screw;

[0012] Furthermore, the cylindrical part of the anvil cooperates with the placement hole provided on the upper part of the support block, and the cylindrical part of the anvil is provided with a placement hole, in which a cylindrical coil spring is provided, and the cylindrical coil spring is also located in the placement hole of the support block, and serves as a buffer and energy storage element, which can support the anvil when the film is deformed and displaced by stress, so that the film is continuously subjected to stress;

[0013] Furthermore, three grooves are provided at the lower part of the support block, respectively cooperating with the pressure gauge and the support screw, and the grooves prevent the pressure gauge from being deviated in the horizontal direction;

[0014] Furthermore, a screw hole is provided at the bottom of the frame, and the height of the frame from the operating table can be adjusted by adjusting the fixing screw, and the position of the support block inside the frame can be adjusted by adjusting the supporting screw;

[0015] Furthermore, a screw hole is provided at the bottom of the frame, and the magnitude of the force applied by the anvil can be adjusted by adjusting the position of the support block.

[0016] After adopting the above scheme, the present invention has the following beneficial effects:

[0017] A specific embodiment of the present invention uses the anvil one, anvil two, and anvil three, which have different force application surfaces and can provide forces of different sizes and directions to the film. The size of the force is measured by the pressure gauge and adjusted by adjusting the position of the supporting screw. Through the above method, the external force applied to the film material to be tested is complex, changeable and detectable.

[0018] In a specific embodiment of the present invention, the device for prestressing and irradiating a film has the following advantages over the existing stress loading device: (1) small size, particularly suitable for irradiation testing in a narrow space of an irradiation testing device; (2) simple operation, overcoming the shortcomings of the existing device that uses weights to load external force, is inconvenient to move, difficult to fix, and has cumbersome adjustments; (3) by utilizing the cooperation between the frame, the support block, and the screw, the top frame anvil is prevented from shifting during the irradiation process, resulting in changes in the applied external force and relaxation of the film material, thereby maintaining a long-lasting and stable prestress; (4) by replacing different top anvils, different forms of prestress can be loaded. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A magnified schematic diagram of part A.

[0021] Figure 3 It is a schematic diagram of the structure of anvil 1.

[0022] Figure 4 This is a cross-sectional view of anvil 1.

[0023] Figure 5 It is a schematic diagram of the structure of anvil 2.

[0024] Figure 6 This is a cross-sectional view of anvil 2.

[0025] Figure 7 It is a schematic diagram of the structure of anvil three.

[0026] Figure 8 It is a cross-sectional view of anvil three.

[0027] Fig. 9 It is a structural schematic diagram of the support block.

[0028] Fig.10 is a cross-sectional view of the support block.

[0029] Fig.11Schematic diagram of film prestress loading and irradiation test

[0030] Fig.12 It is a schematic diagram of the mechanical properties data of the film after prestress is applied to the top frame and irradiated with different doses. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is described clearly and completely below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 The embodiment of the present invention provides a device for film prestressing loading and irradiation testing, which is used as follows Figure 1 The application of complex external forces to the film shown includes a frame 1, a support block 2, an anvil 3, and a pressure gauge 4.

[0033] The frame includes an overall frame 11 with a cubic structure, a pressure plate 12 for fixing the thin film material to be tested and a fixing screw group 13 at the bottom of the overall frame; the support block 2 is arranged inside the frame 11, supported by the support screws 13, and can move up and down inside the frame 11; the anvil 3 includes anvil 1 31, anvil 2 32, and anvil 33. In this embodiment, anvil 1 31 is selected and arranged in the placement hole 21 on the upper part of the support block. Adjusting the support screws 13 can make the anvil 1 31 move up and down inside the frame 11 without shifting; the pressure gauge 4 is fixed in the groove 22 at the lower part of the support block 2 by the support screws 62 so that it does not shift, so as to measure the magnitude of the loading force on the thin film material 5 to be tested.

[0034] A film material 5 to be tested is arranged between the frame 11 and the pressure plate 12. The anvil 31 is arranged below the film 5 as a force-applying component. A placement hole 312 is arranged in the cylindrical part 311 at the lower part of the anvil 31 for placing the coil spring 63. A placement hole 21 is arranged on the upper part of the support block 2 for cooperating with the cylindrical part 311 of the anvil 31 to prevent it from shifting in the horizontal direction and affecting the anvil 31 from applying external force.

[0035] The frame 11 is provided with screw holes at the bottom. The height of the frame 11 from the operating table can be adjusted by adjusting the fixing screw group 13. The position of the support block 2 can be adjusted by adjusting the supporting screw 61. Adjusting the position of the support block 2 can change the position of the anvil 31, thereby changing the magnitude of the external force applied by the anvil 31 to the film material 5 to be tested.

[0036] The embodiment of the present invention can provide stresses of different magnitudes. The calculation formula of the stress provided in this embodiment is:

[0037]

[0038]

[0039]

[0040] Among them, F 1 、F 2 、F 3 F is the force per unit area of ​​the film when the anvil is acting on the first, second and third anvils respectively; 0 、F 0′ 、F 0″ G is the reading displayed by the pressure gauge when the anvil is in action, the anvil is in action, and the anvil is in action. 1 , G 1′ , G 1″ are the masses of anvil 1, anvil 2, and anvil 3 respectively; G 2 , G 2′ , G 2″ G is the mass of the supporting blocks corresponding to anvil 1, anvil 2 and anvil 3 respectively; 3 , G 3′ , G 3″ are the masses of the coil springs corresponding to the anvils 1, 2 and 3 respectively; α, β and γ are the angles between the film and the horizontal direction when the anvils 1, 2 and 3 act on the film respectively; S 1 , S 2 , S 3 They are the cross-sectional areas of the force-bearing parts of the corresponding films when anvil one, anvil two and anvil three act respectively.

[0041] When the anvil 31 continuously applies external force to the film material 5 to be tested, the film material 5 to be tested will undergo a certain amount of deformation. When the film material 5 to be tested is deformed, the coil spring 63 supports the anvil 31 to continuously apply external force to the film material 5 to be tested.

[0042] Fig.12 The results show that the film's fracture strength changes significantly under continuous prestress loading and irradiation, which is closely related to the irradiation dose.

Claims

1. A device for film prestressing loading and irradiation testing, characterized in that: At least includes a frame, a support block, an anvil, and a pressure gauge; The frame includes an overall frame of a cubic structure, a pressure plate and supporting screws at the bottom; The support block is arranged inside the frame, supported by the support screws, and can move up and down inside the frame; The anvils include anvil 1, anvil 2 and anvil 3. The anvils are arranged above the support block, supported by the support block and can move up and down inside the frame. The force-applying part of the anvil 1 is spherical, which applies forces from different directions on the spherical surface to the film. After the film is fixed, the anvil 2 provides tension in the horizontal direction. The force-applying part of the anvil 3 is a semi-cylinder, which provides force from the side direction of the cylinder. The three anvils can be replaced. The pressure gauge is arranged below the support block and can move up and down inside the frame.

2. A device for film prestressing and irradiation testing as claimed in claim 1, characterized in that: On the frame, the thin film material to be tested is fixed by the pressing plate.

3. A device for film prestressing and irradiation testing as claimed in claim 1, characterized in that: The anvil is provided with a placement hole; The support block is provided with a placement hole on its upper portion, which engages with the placement hole of the anvil and can move up and down in the frame without deviation; A cylindrical coil spring is arranged at the engaging part of the anvil placement hole and the support block placement hole, which serves as a buffer and energy storage element and can support the anvil when the film is deformed and displaced by stress, so that the film is continuously stressed without relaxation.

4. A device for film prestressing and irradiation testing as claimed in claim 1, characterized in that: The lower part of the support block is provided with a groove which is engaged with the pressure gauge and the screw.

5. The device for film prestressing and irradiation testing according to claim 1, characterized in that: The bottom of the frame is provided with screw holes, and the height of the frame from the operating table and the position of the support block can be adjusted by adjusting the screws.

6. A device for film prestressing and irradiation testing as claimed in claim 5, characterized in that: The magnitude of the force applied by the anvil can be changed by adjusting the position of the support block.

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