A planar uniformly distributed rectangular pulse load loading device and loading method

Abstract

The present invention relates to the field of test loading, and more specifically to a planar uniformly distributed rectangular pulse load loading device and a loading method, which solves the problem that rectangular transient loading cannot be achieved in the prior art. A planar uniformly distributed rectangular pulse load loading device includes a test chamber device, a pressure-maintaining device and a control system. The test chamber device and the pressure-maintaining device are connected through a number of pipelines, the pressure-maintaining device is electrically connected to the control system, and the control system is electrically connected to the test chamber device. The control system is used to control the pressure-maintaining device to output corresponding pressure when the test chamber device performs a loading test, and controls the first rotating baffle assembly and the second rotating baffle assembly to complete the transient loading or unloading of the rectangular load on the test piece fixed on the test chamber device. It is used to perform transient loading experiments with rectangular loads.

Description

Technical Field

[0001] The invention belongs to the field of test loading, and in particular relates to a planar uniformly distributed rectangular pulse load loading device and a loading method. Background Art

[0002] The response and damage of structures under explosive impact loads is an important issue. Ships, aircraft, tanks and other equipment will be subjected to explosive impacts in wars, and buildings may suffer from explosive impacts due to internal gas explosions. These are all structural explosive impact issues. Therefore, the study of the response and damage of various structures under explosive loads is of great significance. For basic structures such as beams, plates, and ship frame structures, the impact dynamics theory can be used to give an analytical solution to the structural impact displacement response under uniformly distributed rectangular pulse loads. In order to verify this analytical solution, corresponding experimental research needs to be carried out, which requires a loading device that can apply uniformly distributed rectangular pulse loads to these structures.

[0003] In order to solve the impact problem of flat plate or flat plate frame structure, a flat uniform rectangular pulse load loading device is developed, which maintains uniform pressure load during the main action time, and the initial load rising stage and the unloading time at the end of the load are extremely short;

[0004] At present, the loading in the existing technology cannot meet the large peak requirements. Either it cannot simulate the deformation process of the test plate or plate frame structure under continuous loading, or the load rise and unloading time is long, and it is impossible to apply a rectangular pulse load with rapid rise and unloading. Another method of applying transient impact loads to the plate or plate frame structure is explosive loading. This loading method is not uniform in time and space, and cannot achieve the required planar uniformly distributed rectangular pulse load. Summary of the invention

[0005] In view of this, the present invention aims to propose a planar uniformly distributed rectangular pulse load loading device and a loading method to solve the problem that rectangular transient loading cannot be achieved in the prior art.

[0006] To achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a planar uniformly distributed rectangular pulse load loading device, comprising a test chamber device, a pressure maintaining device and a control system, wherein the test chamber device is connected to the pressure maintaining device via a plurality of pipelines, the pressure maintaining device is electrically connected to the control system, the control system is electrically connected to the test chamber device, a first rotating baffle assembly and a second rotating baffle assembly are provided in the test chamber device, the control system is used to control the pressure maintaining device to output corresponding pressure when the test chamber device performs a loading test, and to control the movement of the first rotating baffle assembly and the second rotating baffle assembly to complete the transient loading or unloading of the rectangular load on the test piece fixed on the test chamber device.

[0007] Furthermore, the test chamber device also includes a test chamber shell, a first wall pressure sensor and a second wall pressure sensor. The test chamber shell is a box structure with openings on both sides, and one open end face is used to fix the test piece. The first rotating baffle assembly is arranged on the side of the open end of the test chamber shell close to the test piece, and the second rotating baffle assembly is arranged at the other open end of the test chamber shell. The second chamber enclosed by the test chamber shell, the first rotating baffle assembly and the test piece is connected to an output pipeline of the pressure maintaining device, and a second wall pressure sensor is arranged in the second chamber. After collecting the signal of the second wall pressure sensor, the control system controls the pressure maintaining device to output the corresponding pressure to the second chamber. The first chamber enclosed by the first rotating baffle assembly, the test chamber shell and the second rotating baffle assembly is connected to another output pipeline of the pressure maintaining device, and a first wall pressure sensor is arranged in the first chamber. After collecting the signal of the first wall pressure sensor, the control system controls the pressure maintaining device to output the corresponding pressure to the first chamber.

[0008] Furthermore, the first rotating baffle assembly and the second rotating baffle assembly have exactly the same structure, and both include a stopper, a rotating blade, a sealing gasket and a rack and pinion linkage, the rack and pinion linkage includes a plurality of gears and a rack for driving all the gears to rotate synchronously, the stopper is fixedly connected to the side walls of the test chamber shell in a centrally symmetrical manner, and a plurality of rotating blades connected to the test chamber shell in a one-to-one correspondence, and when the plurality of rotating blades are closed, a sealing surface is formed with the stoppers on both sides, and the control system controls the movement of the rack.

[0009] Furthermore, each of the rotating blades can be rotated 90 degrees to open from the sealing surface state.

[0010] Furthermore, the rotating blades are parallelogram structures, and adjacent sides of two adjacent parallelogram structures are in contact with each other when closed, and the adjacent sides are separated from each other during loading test.

[0011] Furthermore, sealing gaskets are provided on the contact surfaces of every two adjacent rotating blades and on the contact planes of the rotating blades on both sides and the stoppers.

[0012] Furthermore, a first pressure-maintaining air hole and a second pressure-maintaining air hole are provided on the outer shell of the test chamber, the first pressure-maintaining air hole is connected to the first cavity, the first pressure-maintaining air hole is connected to the pressure-maintaining device through an air pipeline, the second pressure-maintaining air hole is connected to the second cavity, and the second pressure-maintaining air hole is connected to the pressure-maintaining device through another air pipeline.

[0013] Furthermore, the test piece is fixed to the test chamber shell by fastening bolts.

[0014] Furthermore, the test piece is a plate structure or a plate frame structure.

[0015] According to another aspect of the present invention, a method for loading a planar uniformly distributed rectangular pulse load is provided, which uses the above-mentioned planar uniformly distributed rectangular pulse load loading device.

[0016] Furthermore, the loading method comprises the following steps:

[0017] S1. Adjust the first rotating baffle assembly and the second rotating baffle assembly to a sealed state, and fix the test piece to the test chamber shell by fastening bolts;

[0018] S2. Pressurize the first cavity and the second cavity by means of a pressure-maintaining device, measure the pressures in the first cavity and the second cavity in real time by means of a first wall pressure sensor and a second wall pressure sensor respectively, and stop pressurizing when the pressure of the first wall pressure sensor reaches a predetermined pressure value. The pressure-maintaining device maintains the pressure value at the wall pressure sensor 1 at a predetermined value, and the pressure value at the second wall pressure sensor at atmospheric pressure:

[0019] S3, start the loading test, control the rack and pinion linkage of the first rotating baffle assembly through the control system to drive the corresponding rotating blades to rotate and open, so that the high-pressure gas acts on the test piece to achieve loading;

[0020] S4. The rack and pinion linkage of the second rotating partition assembly is controlled by the control system to drive the corresponding rotating blades to rotate and open. The time interval between the opening time and the loading time is the rectangular pulse loading time. After opening, the load is unloaded to complete the loading test.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. A predetermined pressure is injected into the first cavity through the pressure-maintaining device and released instantly, so that a planar uniformly distributed rectangular pulse load can be applied to the test piece, and a rectangular uniformly distributed load can be applied;

[0023] 2. Instantaneous loading and unloading can be achieved through the cooperation of the first rotating baffle assembly and the second rotating baffle assembly, so that the loading time can be controlled;

[0024] 3. Dynamic loading can be achieved through the cooperation of the pressure-maintaining device and the first rotating baffle assembly;

[0025] 4. The test plate or plate frame structure can be easily disassembled to achieve efficient and convenient loading test;

[0026] 5. Static load loading can be achieved by reducing the loading pressure and increasing the loading time, such as simulating the quasi-static pressure load of an explosion in a cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a structural schematic diagram of a planar uniformly distributed rectangular pulse load loading device according to the present invention;

[0029] Figure 2 It is a structural schematic diagram of the test cabin device of the present invention;

[0030] Figure 3 It is a structural schematic diagram of the first rotating baffle assembly of the present invention;

[0031] Figure 4 It is a structural schematic diagram of the second rotating baffle assembly of the present invention;

[0032] Figure 5 This is a schematic diagram of the 90-degree opening structure of the rotating blades of the present invention.

[0033] Test chamber device 1; first rotating baffle assembly 101; test chamber shell 102; first pressure-maintaining air hole 103; second rotating baffle assembly 104; first wall pressure sensor 105; first rack and pinion linkage 106; fastening bolt 107; second wall pressure sensor 108; test plate 110; second pressure-maintaining air hole 111; first cavity 112; second cavity 113; first stopper 114; first rotating blade 115; first sealing gasket 116; second stopper 117; second rotating blade 118; second sealing gasket 119; second rack and pinion linkage 120; pressure-maintaining device 2; control system 3; signal line 4; gas pipeline 5. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict, and the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0035] Referring to the accompanying drawings, this embodiment is described. According to one aspect of the present invention, there is provided a planar uniformly distributed rectangular pulse load loading device, comprising a test chamber device 1, a pressure maintaining device 2 and a control system 3. The test chamber device 1 is connected to the pressure maintaining device 2 via a plurality of pipelines, the pressure maintaining device 2 is electrically connected to the control system 3, the control system 3 is electrically connected to the test chamber device 1, a first rotating baffle assembly 101 and a second rotating baffle assembly 104 are provided in the test chamber device 1, the control system 3 is used for controlling the pressure maintaining device 2 to output a corresponding pressure when the test chamber device 1 performs a loading test, and controlling the first rotating baffle assembly 101 and the second rotating baffle assembly 104 to move to complete the transient loading or unloading of the rectangular load on the test piece fixed on the test chamber device 1.

[0036] In the present embodiment, the test chamber device 1 further comprises a test chamber shell 102, a first wall pressure sensor 105 and a second wall pressure sensor 108. The test chamber shell 102 is a box structure with openings on both sides, one end face of the opening is used to fix the test piece 110, the first rotating baffle assembly 101 is arranged on one side of the opening end of the test chamber shell 102 close to the test piece 110, the second rotating baffle assembly 104 is arranged at the other side of the opening end of the test chamber shell 102, and the second cavity 113 enclosed by the test chamber shell 102, the first rotating baffle assembly 101 and the test piece 110 is connected to the pressure maintaining chamber 113. An output pipeline of the device 2 is connected, and a second wall pressure sensor 108 is provided in the second chamber 113. After the control system 3 collects the signal of the second wall pressure sensor 108, it controls the pressure maintaining device 2 to output the corresponding pressure to the second chamber 113. The first chamber 112 enclosed by the first rotating baffle assembly 101, the test chamber shell 102 and the second rotating baffle assembly 104 is connected to another output pipeline of the pressure maintaining device 2. The first chamber 112 is provided with a first wall pressure sensor 105. After the control system 3 collects the signal of the first wall pressure sensor 105, it controls the pressure maintaining device 2 to output the corresponding pressure in the first chamber 112.

[0037] In this embodiment, in this embodiment, the first rotating baffle assembly 101 includes a first stopper 114, a first rotating blade 115, a first sealing gasket 116 and a first rack-and-pinion linkage 106, the first rack-and-pinion linkage 106 includes a plurality of gears and a first rack for driving all first gears to rotate synchronously, the first stopper 114 is fixedly connected to the inner wall of the test chamber shell 102, and a plurality of first rotating blades 115 connected one-to-one with the first gear are rotatably connected to the first stopper 114, and a plurality of first rotating blades 115 are formed with the first stopper 114 when the plurality of first rotating blades 115 are closed, and a sealing surface is formed with the first stopper 114, the control system 3 controls the movement of the first rack, and when a loading test is required, the movement of the first rack is controlled by the control system 3, the movement of the first rack will drive all first gears to rotate synchronously by 90 degrees, and all first gears will drive the corresponding first rotating blades 115 to rotate synchronously, so that the first rotating blades 115 rotate and open, so that the pressure in the first chamber 112 will instantly act on the fixed test piece 110, thereby performing a transient plane rectangular load loading test.

[0038] In this embodiment, the second rotating baffle assembly 104 includes a second stopper 117, a second rotating blade 118, a second sealing gasket 119, and a second rack-and-pinion linkage 120. The second rack-and-pinion linkage 120 includes a plurality of second gears and a second rack for driving all the second gears to rotate synchronously. The second stopper 117 is fixedly connected to the inner wall of the test chamber shell 102. The second stopper 117 is rotatably connected to a plurality of second rotating blades 118 that are connected one-to-one with the second gears. When the second rotating blades 118 are closed, a sealing surface is formed with the second stopper 117. The control system 3 controls the movement of the second rack. After the loading is completed, pressure release is required. At this time, the control system 3 controls the movement of the second rack. The movement of the second rack will drive all the second gears to rotate synchronously by 90 degrees. All the second gears will drive the corresponding second rotating blades 118 to rotate synchronously, so that the second rotating blades 118 rotate to open, which will release the pressure instantly. The difference between the time of release and the time of starting loading is the loading time.

[0039] In this embodiment, each of the rotating blades can be rotated 90 degrees from the sealing surface state to open. The rotating blades are parallelogram structures. When closed, the adjacent sides of two adjacent parallelogram structures contact each other. During the loading test, the adjacent sides are separated from each other. Sealing gaskets are provided on the contact surfaces of every two adjacent rotating blades and on the planes where the rotating blades on both sides contact the blocks, which can ensure the sealing state, ensure that the rotating blades can rotate smoothly, and ensure the stability of the pressure in the first chamber 112 and the second chamber 113.

[0040] In this embodiment, a first pressure-maintaining air hole 103 and a second pressure-maintaining air hole 111 are provided on the test chamber shell 102, the first pressure-maintaining air hole 103 is connected to the first cavity 112, the first pressure-maintaining air hole 103 is connected to the pressure-maintaining device 2 through an air pipeline 5, the second pressure-maintaining air hole 111 is connected to the second cavity 113, the second pressure-maintaining air hole 111 is connected to the pressure-maintaining device 2 through another air pipeline 5, and the pressure-maintaining device 2 outputs pressure to the first cavity 112 and the second cavity 113 respectively through the two air pipelines 5.

[0041] In this embodiment, the test piece 110 is fixed to the test chamber shell 102 by fastening bolts 107, which is convenient for disassembly and assembly.

[0042] In this embodiment, the test piece 110 is a plate structure or a plate frame structure, which increases the range of workpieces that the test can be applied to.

[0043] According to another aspect of the present invention, there is provided a method for loading a planar uniformly distributed rectangular pulse load using the above-mentioned planar uniformly distributed rectangular pulse load loading device, comprising the following steps:

[0044] S1, adjust the first rotating baffle assembly 101 and the second rotating baffle assembly 104 to a sealed state, and fix the test piece 110 to the test chamber shell 102 by fastening bolts 107;

[0045] S2. Pressurize the first cavity 112 and the second cavity 113 through the pressure-maintaining device 2, and measure the pressures in the first cavity 112 and the second cavity 113 in real time through the first wall pressure sensor 105 and the second wall pressure sensor 108 respectively. When the pressure of the first wall pressure sensor 105 reaches a predetermined pressure value, the pressurization is stopped, and the pressure-maintaining device 2 maintains the pressure value at the first wall pressure sensor 105 at a predetermined value, and the pressure value at the second wall pressure sensor 108 at atmospheric pressure:

[0046] S3, start the loading test, control the rack and pinion linkage of the first rotating baffle assembly 101 through the control system 3 to drive the corresponding rotating blades to rotate and open, so that the high-pressure gas acts on the test piece 110 to achieve loading;

[0047] S4. Control the rack and pinion linkage of the second rotating baffle assembly 104 through the control system 3 to drive the corresponding rotating blades to rotate and open. The time interval between the opening time and the loading time is the rectangular pulse loading time. After opening, the load is unloaded to complete the loading test.

[0048] The above method can be used to complete the loading test, thereby completing the test of loading a plane uniformly distributed rectangular pulse load.

[0049] The specific force analysis of this loading device is as follows:

[0050] The panel frame structure of the test chamber shell 102, the first rotating baffle assembly 101 and the second rotating baffle assembly 104 need to meet the structural strength under the action of high-pressure gas in the box. The panel frame structure strength design formula of the test chamber shell 102 is:

[0051] Among them, M b is the ultimate bending moment of the plate beam. The plate beam is a structure composed of the reinforcing ribs and the plate of the plate frame structure. D is the width of the plate, which is taken as b and L. b / 6, where b is the skeleton spacing, L b is the frame length, β is the safety factor, which is selected by the designer based on actual conditions and is recommended to be between 1.2 and 1.8. m is the maximum value of the high-pressure gas pressure in the test chamber shell 102, and the calculation formula is:

[0052] Wherein, P0 is the peak value of the rectangular pulse load applied to the test plate or the plate frame structure, V1 is the volume of the first cavity 112 , and V2 is the volume of the second cavity 113 .

[0053] The strength design formula of the rotating blade is:

[0054] Among them, M g is the ultimate bending moment of the rotating blade, B is the width of the rotating blade, L is the length of the rotating blade, and α is the safety factor, which is selected by the designer based on actual conditions and is recommended to be between 1.2 and 1.8.

[0055] Assume that the requirements for the loading device are as follows: for a 1*1m flat plate or plate frame structure, the loading device can apply a planar uniformly distributed rectangular pulse load, with a maximum load peak value P0=9Mpa and a minimum load pulse width τ=10ms.

[0056] First, the structural parameters of the device are designed. According to the test requirements, the size of the test plate or plate rack structure is 1*1m, so the size of the test chamber shell 102 is designed to be 1*1*1m, the width of the rotating blade of the rotating partition is designed to be 0.15m, and the center of the rotating blade is 0.1m away from the test plate or plate rack structure, thereby ensuring that the rotating blade does not touch the test piece structure when it is opened.

[0057] The peak value of the rectangular load P0 and the internal pressure P of the test chamber shell 102 m The relationship is:

[0058] Design the box frame structure parameters by formula, taking β as 1.2, L b =1m, b = 0.25m, then P mis 10MPa, and we can get: M b >1.3*10 5 N m ;

[0059] The wall thickness of the test cabin shell 102 is selected to be 12mm, the rib spacing is 250mm, the material yield strength is not less than 600MPa, the rib size is 14*100 / 14*150, and the strip width D=0.17m. The ultimate bending moment M can be calculated. b 1.6×10 5 Nm, meeting the strength requirements.

[0060] The structural parameters of the rotary blades are designed by the pass method, and the design values ​​are as follows:

[0061] Take α as 1.2, L as 1m, B as 0.15m, P m is 10MPa, and we can get: M g >1.1*10 5 Nm;

[0062] For a rotating blade with a thickness of 65 mm, a width of 150 mm, and a yield strength of not less than 800 MPa, the ultimate bending moment M can be calculated. g 1.3×10 5 Nm, meeting the strength requirements.

[0063] The control system is selected so that the minimum control time interval is 10 ms.

[0064] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. According to the content of this specification, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well.

Claims

1. A planar uniformly distributed rectangular pulse load loading device, characterized in that: The invention comprises a test chamber device (1), a pressure-maintaining device (2) and a control system (3), wherein the test chamber device (1) is connected to the pressure-maintaining device (2) via a plurality of pipelines, the pressure-maintaining device (2) is electrically connected to the control system (3), and the control system (3) is electrically connected to the test chamber device (1). A first rotating baffle assembly (101) and a second rotating baffle assembly (104) are provided in the test chamber device (1), and the control system (3) is used to control the pressure-maintaining device (2) to output a corresponding pressure when the test chamber device (1) is subjected to a loading test, and to control the first rotating baffle assembly (101) and the second rotating baffle assembly (104) to move so as to complete the transient loading or unloading of a rectangular load on a test piece fixed on the test chamber device (1); The test chamber device (1) further comprises a test chamber shell (102), a first wall pressure sensor (105) and a second wall pressure sensor (108); the test chamber shell (102) is a box structure with openings on both sides, one open end face of which is used to fix a test piece (110); the first rotating baffle assembly (101) is arranged on one side of the open end of the test chamber shell (102) close to the test piece (110); the second rotating baffle assembly (104) is arranged at the other open end of the test chamber shell (102); the second chamber (113) enclosed by the test chamber shell (102), the first rotating baffle assembly (101) and the test piece (110) is connected to the pressure maintaining device (2) An output pipeline is connected, a second wall pressure sensor (108) is provided in the second chamber (113), the control system (3) controls the pressure-maintaining device (2) to output a corresponding pressure to the second chamber (113) after collecting a signal from the second wall pressure sensor (108), a first chamber (112) enclosed by the first rotating baffle assembly (101), the test chamber shell (102) and the second rotating baffle assembly (104) is connected to another output pipeline of the pressure-maintaining device (2), a first wall pressure sensor (105) is provided in the first chamber (112), and the control system (3) controls the pressure-maintaining device (2) to output a corresponding pressure to the first chamber (112) after collecting a signal from the first wall pressure sensor (105); The first rotating baffle assembly (101) and the second rotating baffle assembly (104) are completely identical in structure, and both include a stopper, a rotating blade, a sealing gasket, and a rack-and-pinion linkage, wherein the rack-and-pinion linkage includes a plurality of gears and a rack for driving all the gears to rotate synchronously, wherein the stopper is fixedly connected to the side walls of the test chamber shell (102) in a centrally symmetrical manner, and a plurality of rotating blades connected to the test chamber shell (102) in a one-to-one correspondence, are rotatably connected, and when the plurality of rotating blades are closed, a sealing surface is formed with the stoppers on both sides, and the control system (3) controls the movement of the rack.

2. A planar uniformly distributed rectangular pulse load loading device according to claim 1, characterized in that: Each of the rotating blades can be rotated 90 degrees to open from the sealing surface state.

3. The device for loading a planar uniformly distributed rectangular pulse load according to claim 1, characterized in that: The rotating blades are parallelogram structures. When closed, the adjacent sides of two adjacent parallelogram structures are in contact with each other, and when loaded, the adjacent sides are separated from each other.

4. A planar uniformly distributed rectangular pulse load loading device according to claim 3, characterized in that: Sealing pads are arranged on the contact surfaces of every two adjacent rotating blades and on the contact planes of the rotating blades on both sides and the stoppers.

5. The planar uniformly distributed rectangular pulse load loading device according to claim 1, characterized in that: The test chamber shell (102) is provided with a first pressure-maintaining air hole (103) and a second pressure-maintaining air hole (111); the first pressure-maintaining air hole (103) is connected to the first cavity (112); the first pressure-maintaining air hole (103) is connected to the pressure-maintaining device (2) via an air pipeline (5); the second pressure-maintaining air hole (111) is connected to the second cavity (113); the second pressure-maintaining air hole (111) is connected to the pressure-maintaining device (2) via another air pipeline (5).

6. The planar uniformly distributed rectangular pulse load loading device according to claim 1, characterized in that: The test piece (110) is fixed to the test chamber shell (102) by means of fastening bolts (107).

7. The device for loading a planar uniformly distributed rectangular pulse load according to claim 1, characterized in that: The test piece (110) is a plate structure or a plate frame structure.

8. A method for loading a planar uniformly distributed rectangular pulse load, comprising using the planar uniformly distributed rectangular pulse load loading device according to any one of claims 1 to 7, the method comprising the following steps: S1. Adjust the first rotating baffle assembly (101) and the second rotating baffle assembly (104) to a sealed state, and fix the test piece (110) to the test chamber shell (102) by fastening bolts (107); S2. Pressurizing the first cavity (112) and the second cavity (113) by means of the pressure-maintaining device (2), measuring the pressures in the first cavity (112) and the second cavity (113) in real time by means of the first wall pressure sensor (105) and the second wall pressure sensor (108), respectively. When the pressure of the first wall pressure sensor (105) reaches a predetermined pressure value, the pressurization is stopped. The pressure-maintaining device (2) maintains the pressure value at the first wall pressure sensor (105) at the predetermined value, and the pressure value at the second wall pressure sensor (108) at the atmospheric pressure: S3, starting the loading test, controlling the rack and pinion linkage of the first rotating baffle assembly (101) through the control system (3) to drive the corresponding rotating blades to rotate and open, so that the high-pressure gas acts on the test piece (110) to achieve loading; S4. The control system (3) controls the rack and pinion linkage of the second rotating baffle assembly (104) to drive the corresponding rotating blades to rotate and open. The time interval between the opening time and the loading time is the rectangular pulse loading time. After opening, the load is unloaded to complete the loading test.

Images