Composite material testing device based on extreme temperature and testing method thereof

Abstract

The invention relates to the technical field of composite material testing, and discloses a composite material testing device based on extreme temperature and a testing method thereof. The moving frame is slidably mounted on one side of the guide rail, and pull ropes are arranged on the upper surface and the lower surface of the moving frame; the at least two pull pressure sensors are symmetrically mounted at the bottom end and the top of the inner side of the movable frame; the connecting rope is fixed at one end of the tension and pressure sensor, and one end of the connecting rope is connected with a tested composite material; the device is simple and convenient to operate, greatly improves the testing efficiency, improves the temperature difference change by shortening the operation time, reduces the influence of the environment temperature, further improves the measurement accuracy under the extreme temperature change, can well verify the stress change formed by thermal expansion and cold contraction at the extreme temperature, and improves the practicability.

Description

Technical Field

[0001] The invention relates to the technical field of composite material testing, and in particular to a composite material testing device based on extreme temperature and a testing method thereof. Background Art

[0002] Composite materials are material systems formed by combining two or more different materials physically or chemically. The main feature of composite materials is that their properties are superior to those of a single material, and they can give full play to the advantages of different materials to achieve better performance. When developing composite materials, extreme temperature tests are required.

[0003] When testing existing composite materials at extreme temperatures, the samples need to be placed in a low-temperature box for low-temperature treatment, then the cabinet door is opened, the length at this time is measured, and then the samples are placed in a tensile testing machine for stretching, and the changes in force and displacement are recorded. Similarly, high-temperature treatment is performed again, and then the tensile testing machine is used for testing to verify the stress changes at extreme temperatures. This is relatively troublesome and time-consuming, and it takes a lot of time to transfer the composite material samples back and forth. The samples will be affected by the external temperature, and the low-temperature and high-temperature treatments are affected by the long time consumption, resulting in a slower temperature difference change, which affects the test accuracy and is not convenient for rapid testing to verify the stress changes of composite materials at extreme temperatures. For this reason, we propose a composite material testing device based on extreme temperatures and a testing method thereof. Summary of the invention

[0004] The purpose of the present invention is to provide a composite material testing device and a testing method based on extreme temperatures, so as to solve the problem that in the existing extreme temperature test proposed in the above background technology, the composite material samples need to be transferred back and forth, which is time-consuming and may be affected by the external ambient temperature, resulting in inaccurate testing. In addition, the low-temperature and high-temperature treatments take a long time, which may also cause slow changes in temperature differences, which is not conducive to ensuring testing under extreme temperature differences.

[0005] To achieve the above object, the present invention provides the following technical solution: a composite material testing device based on extreme temperature, comprising:

[0006] guide;

[0007] A movable frame is slidably mounted on one side of the guide rail, and the upper and lower surfaces of the movable frame are provided with pull ropes;

[0008] At least two tension and pressure sensors are symmetrically installed at the bottom and top of the inner side of the mobile frame;

[0009] A connecting rope is fixed to one end of the tension and pressure sensor, and one end of the connecting rope is connected to the composite material to be tested;

[0010] Mounting frame;

[0011] A high temperature box is installed on one side of the guide rail through the mounting frame, and the inlet and outlet of the high temperature box correspond to the connecting rope;

[0012] The low temperature box is arranged below the high temperature box, and the low temperature box is fixed to the guide rail through another mounting frame.

[0013] Preferably, the movable frame comprises a slider and a support block, a slide groove is provided on the inner side of the guide rail, the slider is slidably installed on the inner side of the slide groove, and a support block is fixed on one side wall of the slider.

[0014] Preferably, the support block is perpendicular to the sliding block.

[0015] Preferably, the cross section of the slider is T-shaped.

[0016] Preferably, sealing rubber blocks are fixed at the inlet and outlet of the high temperature box, and through grooves for the connecting rope and the composite material to pass through are opened on the inner side of the sealing rubber blocks.

[0017] Preferably, one end of the mounting frame is fixed to the high temperature box by bolts, and the other end is fixed to the guide rail by welding.

[0018] Preferably, two connecting ropes are provided, and one end of each of the two connecting ropes is fixed to the composite material.

[0019] A testing method for a composite material testing device based on extreme temperature comprises the following steps:

[0020] Step A: slide the slider inside the slide groove, fix the tension and pressure sensor to the support block, and fix the other end of the tension and pressure sensor to the composite material through a connecting rope;

[0021] Step B: connecting the tension and pressure sensor to an external computer through a wire to display the tension and pressure, adjusting the tension by adjusting the length of the connecting rope, the tension value after adjustment is A, and the length of the composite material measured is length value B;

[0022] Step C: an external force pulls the rope on the lower surface of the mobile frame, and the rope drives the mobile frame to move downward. At this time, the composite material enters the inner side of the low-temperature box, and the composite material is cooled by the low-temperature box. The composite material shortens when it is cooled, and the tension value A at this time is recorded. When the composite material is pulled out of the low-temperature box, the length value B at this time is recorded;

[0023] Step D: external force pulls the rope on the upper surface of the mobile frame, so that the composite material quickly enters the inside of the high temperature box to be heated. The composite material expands when heated, and the tension value A at this time is recorded. When the composite material is pulled out of the high temperature box, the length value B at this time is recorded;

[0024] Step E: Count the changes in the tension value A and the length value B in step C and step D, that is, the stress change caused by the deformation of the composite material at extreme temperature.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention is easy to operate and can quickly test composite materials, avoiding the time-consuming traditional test, slow temperature difference change, and inconvenience in verifying the stress change caused by deformation under extreme temperature. The device is easy to operate and greatly improves the test efficiency. By shortening the operation time to increase the temperature difference change and reduce the influence of ambient temperature, the accuracy of measurement under extreme temperature change is improved, and the stress change caused by thermal expansion and contraction under extreme temperature can be well verified, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention;

[0028] Figure 2 It is a schematic diagram of the installation structure of the tension and pressure sensor of the present invention;

[0029] Figure 3 It is a schematic diagram of the chute structure of the present invention.

[0030] In the figure: 1. guide rail; 101. slide groove; 2. moving frame; 201. slider; 202. support block; 3. pull rope; 5. mounting frame; 6. high temperature box; 601. sealing rubber block; 7. low temperature box; 8. tension pressure sensor; 9. connecting rope; 10. composite material. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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-Figure 3 The present invention provides a technical solution: a composite material testing device based on extreme temperature, comprising:

[0033] Guide rail 1;

[0034] The movable frame 2 is slidably mounted on one side of the guide rail 1, and the upper and lower surfaces of the movable frame 2 are provided with pull ropes 3;

[0035] At least two tension and pressure sensors 8 are symmetrically mounted at the bottom and top of the inner side of the mobile frame 2, so as to test the stress caused by the deformation of the composite material 10 under high and low temperature environments;

[0036] A connecting rope 9 is fixed to one end of the tension and pressure sensor 8, and one end of the connecting rope 9 is connected to the composite material 10 to be tested;

[0037] Mounting frame 5;

[0038] The high temperature box 6 is installed on one side of the guide rail 1 through the mounting frame 5, and the inlet and outlet of the high temperature box 6 correspond to the connecting rope 9, so as to facilitate the testing of the thermal expansion of the composite material 10 in a high temperature environment;

[0039] The low temperature box 7 is arranged below the high temperature box 6, and the low temperature box 7 is fixed to the guide rail 1 through another mounting frame 5, so as to facilitate the testing of the cold shrinkage of the composite material in a low temperature environment.

[0040] Preferably, the mobile frame 2 includes a slider 201 and a support block 202. A slide groove 101 is opened on the inner side of the guide rail 1. The slider 201 is slidably installed on the inner side of the slide groove 101, and a support block 202 is fixed to one side wall of the slider 201, so as to drive the composite material 10 to move up and down quickly to detect changes in the composite material 10 under extreme temperatures.

[0041] Preferably, the supporting block 202 is perpendicular to the sliding block 201 .

[0042] Preferably, the cross section of the slider 201 is “T”-shaped, so as to prevent the slider 201 from accidentally falling out of the inner side of the slide groove 101 .

[0043] Preferably, sealing rubber blocks 601 are fixed at the inlet and outlet of the high temperature box 6, and a through groove is provided inside the sealing rubber block 601 for the connecting rope 9 and the composite material 10 to pass through, so as to facilitate heat preservation and reduce heat dissipation to the outside.

[0044] Preferably, one end of the mounting frame 5 is fixed to the high temperature box 6 by bolts, and the other end is fixed to the guide rail 1 by welding, so as to facilitate installation and fixation.

[0045] Preferably, two connecting ropes 9 are provided, and one end of the two connecting ropes 9 is fixed to the composite material 10 , so as to facilitate the connection and cooperation between the two ends of the composite material 10 and the two tension and pressure sensors 8 , respectively.

[0046] A testing method for a composite material testing device based on extreme temperature comprises the following steps:

[0047] Step A: slide the slider 201 inside the slide groove 101, fix the tension and pressure sensor 8 to the support block 202, and fix the other end of the tension and pressure sensor 8 to the composite material 10 through the connecting rope 9;

[0048] Step B: connecting the tension and pressure sensor 8 to an external computer through a wire to display the tension and pressure, adjusting the tension by adjusting the length of the connecting rope 9, and adjusting the tension value to A, and measuring the length of the composite material 10 to be a length value B;

[0049] Step C: an external force pulls the rope 3 on the lower surface of the mobile frame 2, and the rope 3 drives the mobile frame 2 to move downward. At this time, the composite material 10 enters the inner side of the low temperature box 7. The composite material 10 is cooled by the low temperature box 7. The composite material 10 shortens when it is cooled. The tension value A at this time is recorded. When the composite material 10 is pulled out of the low temperature box 7, the length value B at this time is recorded.

[0050] Step D: an external force is used to pull the rope 3 on the upper surface of the mobile frame 2, so that the composite material 10 quickly enters the inner side of the high temperature box 6 to be heated. The composite material 10 expands when heated, and the tension value A at this time is recorded. When the composite material 10 is pulled out of the high temperature box 6, the length value B at this time is recorded;

[0051] Step E: Counting the changes in the tension value A and the length value B in step C and step D, that is, the stress change caused by the deformation of the composite material 10 at extreme temperature.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite material testing device based on extreme temperature, characterized in that: include: Guide rail (1); A movable frame (2) is slidably mounted on one side of the guide rail (1), and the upper and lower surfaces of the movable frame (2) are both provided with pull ropes (3); At least two tension and pressure sensors (8) are symmetrically mounted on the bottom and top of the inner side of the moving frame (2); A connecting rope (9) is fixed to one end of the tension and pressure sensor (8), and one end of the connecting rope (9) is connected to the composite material (10) to be tested; Mounting frame (5); A high temperature box (6) is installed on one side of the guide rail (1) through the installation frame (5), and the inlet and outlet of the high temperature box (6) correspond to the connecting rope (9); The low temperature box (7) is arranged below the high temperature box (6), and the low temperature box (7) is fixed to the guide rail (1) via another mounting frame (5).

2. The extreme temperature composite material testing device according to claim 1, characterized in that: The movable frame (2) comprises a slider (201) and a support block (202); a slide groove (101) is provided on the inner side of the guide rail (1); the slider (201) is slidably mounted on the inner side of the slide groove (101); and a support block (202) is fixed to one side wall of the slider (201).

3. The extreme temperature composite material testing device according to claim 2, characterized in that: The support block (202) is perpendicular to the sliding block (201).

4. The extreme temperature composite material testing device according to claim 2, characterized in that: The cross section of the sliding block (201) is in a "T" shape.

5. The extreme temperature composite material testing device according to claim 1, characterized in that: Sealing rubber blocks (601) are fixed at the inlet and outlet of the high temperature box (6), and a through groove for the connecting rope (9) and the composite material (10) to pass through is provided on the inner side of the sealing rubber block (601).

6. The extreme temperature composite material testing device according to claim 1, characterized in that: One end of the mounting frame (5) is fixed to the high temperature box (6) by means of bolts, and the other end is fixed to the guide rail (1) by means of welding.

7. The extreme temperature composite material testing device according to claim 1, characterized in that: Two connecting ropes (9) are provided, and one end of each of the two connecting ropes (9) is fixed to the composite material (10).

8. The testing method of a composite material testing device based on extreme temperature according to claim 1, characterized in that: The steps include: Step A: The slider (201) is slidably installed inside the slide groove (101), the tension and pressure sensor (8) is fixed to the support block (202), and the other end of the tension and pressure sensor (8) is fixed to the composite material (10) via a connecting rope (9); Step B: connecting the tension and pressure sensor (8) to an external computer via a wire to display the tension and pressure, adjusting the length of the connecting rope (9) to adjust the tension, the tension value after adjustment is A, and measuring the length of the composite material (10) to be the length value B; Step C: an external force pulls the pull rope (3) on the lower surface of the moving frame (2), and the pull rope (3) drives the moving frame (2) to move downward. At this time, the composite material (10) enters the inner side of the low temperature box (7), and the composite material (10) is cooled by the low temperature box (7). The composite material (10) shortens when it is cooled, and the pulling force value A at this time is recorded. When the composite material (10) is pulled out of the low temperature box (7), the length value B at this time is recorded; Step D: external force is used to pull the pull rope (3) on the upper surface of the mobile frame (2), so that the composite material (10) quickly enters the inner side of the high temperature box (6) to be heated. The composite material (10) expands when heated, and the pulling force value A at this time is recorded. When the composite material (10) is pulled out of the high temperature box (6), the length value B at this time is recorded; Step E: Counting the changes in the tension value A and the length value B in step C and step D, that is, the changes in the stress magnitude caused by the deformation of the composite material (10) at extreme temperatures.

Images