Tensile and creep endurance test device for brittle material

Abstract

The utility model belongs to the field of test appliances and devices, and particularly discloses a tensile and creep endurance test device for a brittle material. The device comprises a chuck, a wedge-shaped lifting shoulder, a sliding ball, a pin and an adapter. The device is connected with a testing machine through pins, and the insertion directions of the upper and lower pins are vertical, so that the influence caused by coaxiality is effectively reduced; the clamping part and the wedge-shaped lifting shoulder are provided with arc grooves, balls are arranged in the clamping part and the wedge-shaped lifting shoulder, the balls can automatically slide in the preloading process after the sample is placed in the clamping part and the wedge-shaped lifting shoulder, the wedge-shaped lifting shoulder can automatically clamp the sample, the problem of non-coaxiality in the operation process is further solved, and the sample can be easily picked after the test is finished through the structure. The device provided by the utility model is easy and convenient to operate, and can effectively improve the accuracy and the working efficiency of the performance test of the ceramic in the high-temperature environment.

Description

Technical Field

[0001] The utility model belongs to the field of test instruments and devices, and specifically discloses a brittle material tensile and creep endurance test device. Background Art

[0002] With the development of science and technology, the demand for performance testing under extreme service conditions will experience a spurt of growth. For nuclear power, aerospace and other fields, the demand for new materials for hot end components is extremely strong, and ultra-high temperature resistant materials will help them continue to make breakthroughs. Traditional metal materials can no longer meet the needs of the new generation of equipment, and inorganic non-metals such as ceramics and fiber-reinforced composite materials have shown broad application prospects.

[0003] At present, the tensile creep test methods for ceramic materials include American standard (high temperature), international standard (high temperature), Japanese standard (high temperature), and Chinese standard (room temperature tensile). In view of the characteristics of ceramics, processing methods, and clamping issues, the specifications do not restrict the shape and size of the specimens, and only provide reference specimen specifications.

[0004] As we all know, brittle materials such as ceramics have high hardness and great brittleness. Other materials such as permanent magnets are also very brittle. The dimensional accuracy of the specimen processing and the coaxiality during the test will have a great impact on the results. Especially for ceramics and fiber-reinforced composite materials, their dimensional processing accuracy is difficult to match that of metal materials, and the coaxiality requirements during the test are extremely high. Therefore, a test device is needed to avoid the above problems. Summary of the invention

[0005] The technical solution adopted by the present invention is as follows:

[0006] A brittle material tensile and creep endurance test device, comprising an overall structure including a chuck, a wedge-shaped lifting shoulder 4, a sliding ball 5, a pin 7, and an adapter 12;

[0007] The chuck comprises a rod and a square head; a chuck pin hole is provided on the rod, and a pin 7 passes through the chuck pin hole and is connected to the adapter 12; a through cylindrical hole is provided in the middle of the square head of the chuck, and a notch is provided at the junction with the cylindrical hole side, and the notch is opposite to the rod; a fixture slide 10 is processed on the semicircular side surface of the cylindrical hole and the notch; a wedge-shaped lifting shoulder 4 is placed in the cylindrical hole, and a wedge block slide 9 matching the fixture slide 10 is processed on the wedge-shaped lifting shoulder 4; a plurality of sliding balls 5 are placed between the wedge block slide 9 and the fixture slide 10; after the specimen 3 is inserted, the sliding ball 5 is placed in the fixture slide 10 at the corresponding position, and then the wedge-shaped lifting shoulder 4 is placed, and the wedge block slide 9 corresponding to the wedge-shaped lifting shoulder 4 can be seated on the sliding ball 5, and when the specimen 3 is preloaded, the chuck pin hole and the pin 7 and the ball 5 can automatically move relative to each other, so that the specimen can be completely centered, thereby improving the reliability of the test result;

[0008] The adapter 12 includes an adapter rod and a fork-shaped head; the two forks of the fork-shaped head are respectively provided with adapter pin holes 14 corresponding to the collet pin holes; the adapter rod is provided with an adapter rod hole 13 parallel to the line connecting the two adapter pin holes 14.

[0009] Preferably, the chuck is divided into an upper chuck 1 and a lower chuck 6 of the same structure, and the insertion directions of the pins 7 of the upper chuck 1 and the lower chuck 6 are perpendicular to each other; the upper chuck 1 and the lower chuck 6 are connected to the adapter 12 through the chuck pin holes and the pins 7, and the vertical insertion direction of the pins 7 can make the fixture relatively rotate in the vertical direction, thereby reducing the result error caused by the coaxiality problem.

[0010] Furthermore, the clamp pin holes on the upper clamp 1 and the lower clamp 6 are the upper clamp pin hole 2 and the lower clamp pin hole 8 respectively.

[0011] Furthermore, the adapter pin hole 14 of the adapter 12 is connected to the equipment crossbeam 15 .

[0012] Furthermore, the adapter rod portion of the adapter 12 is cylindrical, and the adapter 12 is inserted into a cylindrical groove 16 provided on the equipment crossbeam 15 .

[0013] Furthermore, the adapter pin hole 14 is connected to the pin hole of the cylindrical groove 16 through a pin structure; after the assembly connection is complete, the adapter 12 cannot swing.

[0014] Furthermore, the equipment crossbeam 15 includes an upper crossbeam and a lower crossbeam, which are respectively connected to the adapter 12 connecting the upper clamp 1 and the lower clamp 6.

[0015] Preferably, the fixture slideway 10 of the chuck is provided with an anti-slip belt 11 to prevent the sliding ball 5 from falling out or directly contacting the sample 3 .

[0016] Preferably, the rod portion of the chuck is a rectangular structure, and the adapter rod of the adapter 12 is a rod structure.

[0017] Preferably, the brittle material tensile and creep endurance test device is made of fiber-reinforced ceramics; on the one hand, it is light in weight and high in strength, and on the other hand, it is suitable for performance testing under high temperature conditions.

[0018] Beneficial effects achieved by the present invention:

[0019] The upper and lower clamp plate pin structures can realize multi-directional twisting, and the wedge-shaped lifting shoulder cooperates with the round ball to freely fit the sample clamping surface during the preloading process, effectively reducing the stress concentration caused by the coaxiality problem; in addition, the sliding wedge-shaped lifting shoulder structure has greater tolerance for the left and right processing symmetry of the sample clamping side, reducing the processing and grinding cost. The utility model is simple to operate and has reliable results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The upper and lower clamping head structures of Example 1 of the utility model;

[0021] Figure 2 This is the front side of the cross-sectional view of the lower clamping head structure in Embodiment 1 of the present utility model;

[0022] Figure 3 The adapter structure described in the utility model;

[0023] Figure 4 It is a schematic diagram of the overall structure of the utility model when it is applied. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail in conjunction with the following examples. It should be noted that the present invention is not limited to the following examples.

[0025] Example 1

[0026] like Figures 1 to 4 As shown, a brittle material tensile and creep endurance test device, the device includes a chuck, a wedge-shaped lifting shoulder 4, a sliding ball 5, a pin 7, and an adapter 12;

[0027] The chuck comprises a rod and a square head; the rod of the chuck is a rectangular structure; a chuck pin hole is provided on the rod, and a pin 7 passes through the chuck pin hole and is connected to the adapter 12; a through cylindrical hole is provided in the middle of the square head of the chuck, and a notch is provided at the junction with the cylindrical hole side, and the position of the notch is opposite to the rod; a fixture slide 10 is processed on the semicircular side surface of the cylindrical hole and the notch; a wedge-shaped lifting shoulder 4 is placed in the cylindrical hole, and a wedge block slide 9 matching the fixture slide 10 is processed on the wedge-shaped lifting shoulder 4; the wedge A plurality of sliding balls 5 are placed between the block slide 9 and the fixture slide 10; after the sample 3 is inserted, the sliding balls 5 are placed in the fixture slide 10 at the corresponding position, and then the wedge-shaped lifting shoulder 4 is placed, and the wedge block slide 9 corresponding to the wedge-shaped lifting shoulder 4 can be seated on the sliding balls 5. When the sample 3 is preloaded, the chuck pin hole and the pin 7 and the balls 5 can automatically move relative to each other, so that the sample can be completely centered, thereby improving the reliability of the test results; the fixture slide 10 of the chuck is provided with a non-slip belt 11 to prevent the sliding balls 5 from falling out or directly contacting the sample 3

[0028] The adapter 12 includes an adapter rod and a fork-shaped head; the two forks of the fork-shaped head are respectively provided with adapter pin holes 14 corresponding to the collet pin holes; the adapter rod is provided with an adapter rod hole 13 parallel to the line connecting the two adapter pin holes 14.

[0029] The chuck is divided into an upper chuck 1 and a lower chuck 6 with the same structure, and the chuck pin holes on the upper chuck 1 and the lower chuck 6 are respectively an upper chuck pin hole 2 and a lower chuck pin hole 8; the insertion directions of the pins 7 of the upper chuck 1 and the lower chuck 6 are perpendicular to each other; the upper chuck 1 and the lower chuck 6 are connected to the adapter 12 through the chuck pin holes and the pin 7, and the vertical insertion direction of the pin 7 can make the fixture relatively rotate in the vertical direction, thereby reducing the result error caused by the coaxiality problem.

[0030] When in use, the adapter pin hole 14 of the adapter 12 is connected to the equipment beam 15; the adapter rod part of the adapter 12 is cylindrical, and the adapter 12 is inserted into the cylindrical groove 16 provided on the equipment beam 15; the adapter pin hole 14 is connected to the pin hole of the cylindrical groove 16 through a pin structure; after the assembly connection is complete, the adapter 12 cannot swing.

[0031] The equipment crossbeam 15 includes an upper crossbeam and a lower crossbeam, which are respectively connected to the adapter 12 connecting the upper clamp 1 and the lower clamp 6.

[0032] The brittle material tensile and creep endurance test device is made of fiber-reinforced ceramics; on the one hand, it is light in weight and high in strength, and on the other hand, it is suitable for performance testing under high temperature conditions.

[0033] The specific experimental operations are as follows:

[0034] The testing machine is operated to preload, and after the specimen is subjected to the load, the whole body is automatically centered.

[0035] When conducting high temperature tests, the testing machine needs to be equipped with specimen protection to prevent damage to the specimen due to expansion of the specimen and fixture during heating. After loading to the set temperature, keep warm for a certain period of time and conduct the test after pre-loading.

[0036] After the test is finished, the wedge-shaped lifting shoulder 4 and the upper 1 and lower 6 chucks are supported by the ball 5, so the wedge-shaped lifting shoulder 4 and the sample 3 can be easily taken out, and then the next test can be carried out.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A brittle material tensile and creep endurance test device, characterized in that: The device comprises a chuck, a wedge-shaped lifting shoulder (4), a sliding ball (5), a pin (7), and an adapter (12); The chuck comprises a rod and a square head; the rod is provided with a chuck pin hole, and a pin (7) passes through the chuck pin hole and is connected to an adapter (12); a through cylindrical hole is provided in the middle of the square head of the chuck, and a notch is provided at the junction with the cylindrical hole side, and the notch is located opposite to the rod; a fixture slideway (10) is processed on the semicircular side surface of the cylindrical hole and the notch; a wedge-shaped lifting shoulder (4) is placed in the cylindrical hole, and a wedge block slideway (9) matching the fixture slideway (10) is processed on the wedge-shaped lifting shoulder (4); a plurality of sliding balls (5) are placed between the wedge block slideway (9) and the fixture slideway (10); The adapter (12) comprises an adapter rod and a fork-shaped head; the two forks of the fork-shaped head are respectively provided with adapter pin holes (14) corresponding to the collet pin holes; the adapter rod is provided with an adapter rod hole (13) parallel to the line connecting the two adapter pin holes (14).

2. The brittle material tensile and creep endurance test device according to claim 1, characterized in that: The clamp is divided into an upper clamp (1) and a lower clamp (6) of the same structure, and the insertion directions of the pins (7) of the upper clamp (1) and the lower clamp (6) are perpendicular to each other.

3. The brittle material tensile and creep endurance test device according to claim 2, characterized in that: The clamp pin holes on the upper clamp (1) and the lower clamp (6) are respectively an upper clamp pin hole (2) and a lower clamp pin hole (8).

4. The brittle material tensile and creep endurance test device according to claim 2, characterized in that: The adapter pin hole (14) of the adapter (12) is connected to the equipment crossbeam (15).

5. The brittle material tensile and creep endurance test device according to claim 4, characterized in that: The adapter rod part of the adapter (12) is cylindrical, and the adapter (12) is inserted into a cylindrical groove (16) provided on the equipment crossbeam (15).

6. The brittle material tensile and creep endurance test device according to claim 5, characterized in that: The adapter pin hole (14) is connected to the pin hole of the cylindrical groove (16) via a pin structure.

7. The brittle material tensile and creep endurance test device according to claim 4, characterized in that: The equipment crossbeam (15) comprises an upper crossbeam and a lower crossbeam, which are respectively connected to the adapter (12) connecting the upper clamp (1) and the lower clamp (6).

8. The brittle material tensile and creep endurance test device according to claim 1, characterized in that: The clamp slideway (10) of the clamp is provided with an anti-slip belt (11).

9. The brittle material tensile and creep endurance test device according to claim 1, characterized in that: The rod portion of the chuck is a rectangular structure, and the adapter rod of the adapter (12) is a bar structure.

10. The brittle material tensile and creep endurance test device according to any one of claims 1 to 9, characterized in that: The brittle material tensile and creep endurance test device is made of fiber-reinforced ceramics.

Images