Compact tensile sample clamp for high-temperature fatigue test

Abstract

The utility model provides a compact tensile sample fixture for high-temperature fatigue test, which comprises a plurality of locking bolts, a heating device, an upper chuck and a lower chuck, the upper end of the upper chuck and the lower end of the lower chuck are both provided with high-temperature fatigue testing machine fixing parts, and the upper chuck and the lower chuck are both located in the heating device. A compact tensile sample slot with a downward opening is formed in the lower end of the upper chuck, an upper threaded hole communicated with the compact tensile sample slot is formed in the side wall of the upper chuck, the locking bolt is in threaded connection with the upper threaded hole, and a compact tensile sample slot with an upward opening is formed in the upper end of the lower chuck; the central axis of the compact tensile sample insertion groove in the upper chuck is coaxial with the central axis of the compact tensile sample insertion groove in the lower chuck, a magnet is fixedly arranged on the side wall of the side, away from the upper threaded hole, of the compact tensile sample insertion groove in the upper chuck, and a magnet is fixedly arranged on the side wall of the side, away from the lower threaded hole, of the compact tensile sample insertion groove in the lower chuck. A lower chuck connecting hole is formed in the bottom of the heating device, the lower chuck is in sealed connection with the heating device through the lower chuck connecting hole, the clamp effectively prevents the sample from loosening in the test process due to the design of the magnet, and the repeatability and reliability of the test are further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to material mechanics performance test field especially relates to compact tension specimen fixture for high temperature fatigue test. BACKGROUND

[0002] In material science research and industrial application, high temperature fatigue test is the key test method for evaluating the durability of materials in high temperature environment. High temperature environment can significantly affect the mechanical properties of materials, leading to stress concentration, material softening and other phenomena, and thus causing the initiation and propagation of fatigue cracks. Therefore, the study and test of the fatigue behavior of materials under high temperature conditions are of great significance to improve the service life and safety of materials. The existing high temperature fatigue test equipment needs to use heating device, high temperature fatigue testing machine and clamp, the clamp for high temperature fatigue test recorded in the announcement number CN218003087U includes high temperature resistant clamp and auxiliary clamp;The high temperature resistant clamp includes upper high temperature clamp and lower high temperature clamp, the auxiliary clamp includes upper auxiliary clamp and lower auxiliary clamp, the upper auxiliary clamp is connected with the upper high temperature clamp, the lower auxiliary clamp is connected with the lower high temperature clamp, the upper and lower parts of the specimen are connected with the upper auxiliary clamp and the lower auxiliary clamp respectively;The auxiliary clamp is composed of two L-shaped clamps, and the two L-shaped clamps clamp the specimen through the formation of U-shaped structure;The lower end of the upper high temperature clamp and the upper end of the lower high temperature clamp are provided with a cylindrical through threaded opening, which is used for connecting with the two L-shaped clamps through the stud bolt;Among them, the distance between the two L-shaped clamps is adjusted by the stud bolt. The auxiliary clamp 3 is composed of two L-shaped clamps, and the two L-shaped clamps clamp the specimen 4 through the formation of U-shaped structure;The lower end of the upper high temperature clamp and the upper end of the lower high temperature clamp are provided with a cylindrical through threaded opening, which is used for connecting with the two L-shaped clamps through the stud bolt 5;Among them, the distance between the two L-shaped clamps is adjusted by the stud bolt 5, which can clamp the upper and lower ends of the specimen 4;The L-shaped clamp is designed with two types, which are plane and groove respectively at the clamping position, respectively used for clamping plate specimen and rod specimen. However, with the diversification of application requirements, especially in the research of compact tension specimen materials, the clamp for rod specimen and plate specimen cannot meet the requirement of accurate measurement. The compact tension specimen is prone to displacement and deformation in high temperature environment due to its special structure, and the deformation degree is more significant than that of rod specimen and plate specimen, which leads to the increase of test data error. Therefore, how to stably fix the compact tension specimen in high temperature environment and prevent its displacement and deformation in the fatigue test process, so as to ensure the reliability of test data has become a difficult problem. SUMMARY

[0003] The technical problem to be solved by the utility model is to provide a compact tension specimen clamp for high temperature fatigue test, which can stably fix the compact tension specimen in high temperature environment.

[0004] The utility model discloses a technical scheme that solves its technical problem is:

[0005] Compact tension specimen clamp for high temperature fatigue test, including a plurality of locking bolts, heating device, upper chuck and lower chuck, the upper end of upper chuck is equipped with high temperature fatigue testing machine fixed part, the lower end of lower chuck is equipped with high temperature fatigue testing machine fixed part, and upper chuck and lower chuck are all located in heating device, and the lower end of upper chuck is opened and has the compact tension specimen slot of going down to the opening, and the lateral wall on upper chuck is equipped with the upper thread hole of compact tension specimen slot intercommunication, and locking bolt is connected with upper thread hole screw thread, when locking bolt rotates, the threaded end of locking bolt can be screwed into or out of upper thread hole, the upper end of lower chuck is opened and has the compact tension specimen slot of going up to the opening, and the center axis of compact tension specimen slot on upper chuck and the center axis of compact tension specimen slot on lower chuck are coaxial, and the compact tension specimen slot of upper chuck is fixedly provided with magnet on the side wall of the side away from upper thread hole, and the compact tension specimen slot of lower chuck is fixedly provided with magnet on the side wall of the side away from lower thread hole, and the bottom of heating device is equipped with lower chuck connecting hole, and lower chuck is sealedly connected with heating device through lower chuck connecting hole.

[0006] Further, the lower chuck connecting hole is a threaded hole, the outer lateral wall of the lower chuck has external threads, the lower chuck connecting hole is threadedly connected with the outer lateral wall of the lower chuck, the lateral wall of the lower chuck is provided with a lower threaded hole communicating with the compact tension specimen slot, and the locking bolt is threadedly connected with the lower threaded hole. When the locking bolt is rotated, the threaded end of the locking bolt can be screwed into or out of the lower threaded hole.

[0007] Further, the compact tension specimen slot of the upper chuck and the compact tension specimen slot of the lower chuck are two strip-shaped grooves with the same opening size, the center axis of the compact tension specimen slot on the upper chuck is coaxial with the center axis of the upper chuck, the center axis of the compact tension specimen slot on the lower chuck is coaxial with the center axis of the lower chuck, and the upper threaded hole and the lower threaded hole are in position correspondence and have the same hole diameter.

[0008] Further, the lateral wall of the upper chuck is provided with at least three upper through holes communicating with the compact tension specimen slot, and the lateral wall of the lower chuck is provided with at least three lower through holes communicating with the compact tension specimen slot.

[0009] Further, the heating device nut is threadedly connected with the outer lateral wall of the lower chuck, and the upper part of the heating device nut abuts against the heating device.

[0010] Further, the heating device nut has at least two, and the outer surface and the inner surface of the bottom of the heating device each have at least one heating device nut.

[0011] Further, the magnet of the upper chuck and the magnet of the lower chuck are each a samarium-cobalt magnet.

[0012] The utility model discloses the beneficial effect is:

[0013] The utility model provides a compact tensile sample clamp for high temperature fatigue test, and the upper chuck and the lower chuck are all opened compact tensile sample slot, and are suitable for compact tensile sample, because the compact tensile sample slot center axis of the upper chuck and the lower chuck is coaxial, can ensure that the sample is in the accurate center position in the clamping process, is favorable to reduce the test error. By adopting high strength high temperature resistant alloy material, the compact tensile sample clamp for high temperature fatigue test has excellent heat resistance and mechanical strength, ensures the stability of the sample in the high temperature environment, thereby improving the accuracy and reliability of the test result. The compact tensile sample fixing mode design makes the sample fastening screw prevent the sample loosening in the test process effectively, further improves the repeatability and reliability of the test, and simultaneously, the design of magnet makes the clamp can stably fix the compact tensile sample under the high temperature environment.

[0014] The lower chuck connecting hole is threadedly connected with the outer side wall of the lower chuck, so that the high-temperature substances in the furnace are prevented from leaking.

[0015] The locking bolt is in the form of a bolt and is threadedly connected with the upper threaded hole and the lower threaded hole, so that the sample can be quickly installed and disassembled, and the fastening of the sample during clamping can be ensured.

[0016] The upper chuck and the lower chuck are provided with at least three locking bolts, which increase the stability of the sample in the stress direction and reduce the displacement risk of the sample during the test.

[0017] The heating device nut is arranged on the outer surface of the bottom of the high-temperature container, so that the substances in the heating device cannot leak, the heating device has a certain bearing effect, and the safety and reliability of the test are improved.

[0018] The arrangement of the at least two heating device nuts further improves the sealing performance, and the leakage of the medium in the furnace can be effectively prevented even under high pressure or high temperature environment. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model, the drawings needed in the embodiments will be briefly introduced as follows.

[0020] Figure 1 is the structural schematic diagram of the compact tensile sample clamp for high temperature fatigue test.

[0021] Figure 2 is the structural schematic diagram of the compact tensile sample.

[0022] In the drawing, 1 is the upper chuck, 2 is the lower chuck, 3 is the locking bolt, 4 is the heating device, and 5 is the heating device nut. DETAILED DESCRIPTION

[0023] The utility model is further described below in connection with the drawings.

[0024] In order to make the utility model's purpose, technical scheme and advantage more clearly, following combining with the drawings and example, the utility model is further detailed, should understand, the following described specific example is only used to explain the utility model, and is not used to limit the utility model.

[0025] In the description in the utility model, it is understood that the orientation or position relation indicated by the terms such as '' above '' '' below '' '' inside '' '' outside '' in the utility model should be broadly understood, and is not used to limit the protection scope of the utility model, for the ordinary skill in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0026] The compact tensile specimen clamp for high-temperature fatigue test, including several locking bolts 3, heating device 4, upper chuck 1 and lower chuck 2, the upper end of upper chuck 1 is equipped with high-temperature fatigue testing machine fixed part, the lower end of lower chuck 2 is equipped with high-temperature fatigue testing machine fixed part, the lower end of upper chuck 1 and the lower end of lower chuck 2 are all located in heating device 4, the lower end of upper chuck 1 is opened with the compact tensile specimen slot of downwards opening, the sidewall of upper chuck 1 is equipped with the upper threaded hole of compact tensile specimen slot, locking bolt 3 is screw thread connection with upper threaded hole, when locking bolt 3 rotates, the threaded end of locking bolt 3 can be screwed into or out of upper threaded hole, the upper end of lower chuck 2 is opened with the compact tensile specimen slot of upwards opening, the center axis of compact tensile specimen slot on upper chuck 1 and the center axis of compact tensile specimen slot on lower chuck 2 are coaxial, the compact tensile specimen slot of upper chuck is fixedly provided with magnet on the sidewall of the side away from upper threaded hole, the compact tensile specimen slot of lower chuck is fixedly provided with magnet on the sidewall of the side away from lower threaded hole, the bottom of heating device is equipped with lower chuck connecting hole, and lower chuck is sealedly connected with heating device through lower chuck connecting hole.

[0027] As Figure 1As shown, when the high-temperature fatigue test is performed, first, the upper end of the compact tension specimen is fixed on the upper clamp 1 by the locking bolt 3, and then the lower end is fixed on the lower clamp 2 by the locking bolt 3. The upper clamp 1 and the lower clamp 2 are fixed on the high-temperature fatigue testing machine through the high-temperature fatigue testing machine fixing part. Then, the heating device 4 is started and wrapped around the compact tension specimen to provide a uniform and stable high-temperature environment. Under the high-temperature condition, the compact tension specimen is subjected to fatigue test by the fatigue testing machine applying cyclic stress. After the test starts, the high-temperature fatigue testing machine applies stress to the clamp and the specimen, and at the same time, the heating device 4 heats the specimen. By monitoring the performance of the specimen in the stress and high-temperature environment in real time, high-temperature fatigue performance data is obtained. During the test, the magnet can well adsorb the specimen to avoid displacement of the specimen due to deformation.

[0028] The lower clamp connecting hole is a threaded hole, the outer side wall of the lower clamp 2 has external threads, the lower clamp connecting hole is threadedly connected with the outer side wall of the lower clamp 2, the side wall of the lower clamp 2 is provided with a lower threaded hole communicating with the compact tension specimen slot, and the locking bolt 3 is threadedly connected with the lower threaded hole. When the locking bolt 3 is rotated, the threaded end of the locking bolt 3 can be screwed into or out of the lower threaded hole.

[0029] The lower clamp connecting hole is a threaded hole, the outer side wall of the lower clamp 2 has external threads, and this connection mode is not only simple and reliable, but also easy to disassemble and replace the heating device 4.

[0030] Further, the compact tension specimen slot of the upper clamp 1 and the compact tension specimen slot of the lower clamp 2 are two strip-shaped grooves with the same opening size, the central axis of the compact tension specimen slot on the upper clamp 1 is coaxial with the central axis of the upper clamp 1, and the central axis of the compact tension specimen slot on the lower clamp 2 is coaxial with the central axis of the lower clamp 2.

[0031] The design of the strip-shaped groove can adapt to the compact tension specimen, the upper clamp connecting hole and the lower clamp connecting hole are arranged at specific positions to ensure that the specimen is always stable during the test, and the design of the lower clamp 2 cooperates with that of the upper clamp 1 to ensure that the specimen remains stable during the test and does not deviate.

[0032] Further, the side wall of the upper clamp 1 is provided with at least two upper through holes penetrating the compact tension specimen slot, and the side wall of the lower clamp 2 is provided with at least two lower through holes penetrating the compact tension specimen slot.

[0033] The design of the at least two upper through holes and the at least two lower through holes, in combination with the same number of locking bolts 3, can ensure the stability of the specimen during the experiment. In a high-temperature environment, the specimen may be deformed, and therefore the increase of the locking bolts 3 can reduce the influence of specimen deformation on the experimental results.

[0034] Further, the heating device nut 5 is screwed with the outer side wall of the lower clamp head, and the upper part of the heating device nut 5 abuts against the heating device 4.

[0035] The design of the heating device nut 5 can effectively prevent the leakage of high-temperature substances, and at the same time, the heating device 4 is supported to some extent, thereby improving the safety and reliability of the test and protecting the safety of the experimental environment and personnel.

[0036] Further, the heating device nut 5 is screwed with the outer side wall of the lower clamp head, and the upper part of the heating device nut 5 abuts against the heating device 4.

[0037] The design of the heating device nut 5 can effectively prevent the leakage of high-temperature substances, and at the same time, the heating device 4 is supported to some extent, thereby improving the safety and reliability of the test and protecting the safety of the experimental environment and personnel.

[0038] Further, the magnet of the upper clamp head 1 and the magnet of the lower clamp head 2 are both samarium-cobalt magnets, and the samarium-cobalt magnet has the advantage of good high-temperature resistance.

[0039] The compact tensile specimen clamp for high-temperature fatigue test provided by the utility model is not limited in preparation process and surface treatment method, and various modifications and changes can be made by the person skilled in the art. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A compact tensile specimen fixture for high-temperature fatigue testing, comprising a plurality of locking bolts (3), a heating device (4), an upper chuck (1) and a lower chuck (2), wherein the upper end of the upper chuck (1) is provided with a high-temperature fatigue testing machine fixing portion, and the lower end of the lower chuck (2) is provided with a high-temperature fatigue testing machine fixing portion, the upper chuck (1) and the lower chuck (2) are both located in the heating device (4), the lower end of the upper chuck (1) is provided with a compact tensile specimen slot with an opening facing downward, the side wall of the upper chuck (1) is provided with an upper threaded hole connected to the compact tensile specimen slot, the locking bolt (3) is threadedly connected to the upper threaded hole, and when the locking bolt (3) is rotated, the threaded end of the locking bolt (3) can be screwed into or out of the upper threaded hole, the upper end of the lower chuck (2) is provided with a compact tensile specimen slot with an opening facing upward, the central axis of the compact tensile specimen slot on the upper chuck (1) and the central axis of the compact tensile specimen slot on the lower chuck (2) are coaxial, and the invention is characterized in that A magnet is fixedly provided on the side wall of the compact tensile specimen slot of the upper chuck (1) away from the upper threaded hole, and a magnet is fixedly provided on the side wall of the compact tensile specimen slot of the lower chuck (2) away from the lower threaded hole. A lower chuck connection hole is provided at the bottom of the heating device (4), and the lower chuck (2) is sealedly connected to the heating device (4) through the lower chuck connection hole.

2. The compact tensile specimen fixture for high temperature fatigue testing according to claim 1, characterized in that: The lower chuck connection hole is a threaded hole, and the outer side wall of the lower chuck (2) has an external thread. The lower chuck connection hole is threadedly connected to the outer side wall of the lower chuck (2). A lower threaded hole connected to the compact tensile specimen slot is provided on the side wall of the lower chuck (2). The locking bolt (3) is threadedly connected to the lower threaded hole. When the locking bolt (3) rotates, the threaded end of the locking bolt (3) can be screwed into or out of the lower threaded hole.

3. The compact tensile specimen fixture for high temperature fatigue testing according to claim 1, characterized in that: The compact tensile specimen slot of the upper chuck (1) and the compact tensile specimen slot of the lower chuck (2) are two strip-shaped slots with the same opening size. The central axis of the compact tensile specimen slot on the upper chuck (1) is coaxial with the central axis of the upper chuck (1), and the central axis of the compact tensile specimen slot on the lower chuck (2) is coaxial with the central axis of the lower chuck (2). The upper threaded hole and the lower threaded hole correspond in position and have the same aperture.

4. The compact tensile specimen fixture for high temperature fatigue testing according to claim 1, characterized in that: At least three upper threaded holes communicating with the compact tensile specimen slots are provided on the side wall of the upper chuck (1), and at least three lower threaded holes communicating with the compact tensile specimen slots are provided on the side wall of the lower chuck (2).

5. The compact tensile specimen fixture for high temperature fatigue testing according to claim 1, characterized in that: It comprises a heating device nut (5), the heating device nut (5) is threadedly connected to the outer side wall of the lower clamp (2), and the upper part of the heating device nut (5) abuts against the heating device (4).

6. The compact tensile specimen fixture for high temperature fatigue testing according to claim 4, characterized in that: There are at least two heating device nuts (5), and the outer surface and the inner surface of the bottom of the heating device (4) each have at least one heating device nut (5).

7. The compact tensile specimen fixture for high temperature fatigue testing according to claim 1, characterized in that: The magnet of the upper chuck (1) and the magnet of the lower chuck (2) are both samarium cobalt magnets.

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