CN114279823A - Creep test device and test fixture for in-band pressure pipe sample - Google Patents
Creep test device and test fixture for in-band pressure pipe sample Download PDFInfo
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- CN114279823A CN114279823A CN202111517596.9A CN202111517596A CN114279823A CN 114279823 A CN114279823 A CN 114279823A CN 202111517596 A CN202111517596 A CN 202111517596A CN 114279823 A CN114279823 A CN 114279823A
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Abstract
The invention discloses a creep test device and a test fixture for an internal pressure pipe sample, wherein the test fixture for the internal pressure pipe sample comprises a connecting sleeve, the first end of the connecting sleeve is used for being connected with a pull rod, the second end of the connecting sleeve is provided with a fixture body for clamping the pipe sample, the connecting sleeve is provided with a joint, the first end of the joint is communicated with the pipe sample, and the second end of the joint extends out of the connecting sleeve. The test fixture for the test sample with the internal pressure pipe is used for clamping the test sample with the pressure introduced under the high-temperature condition.
Description
Technical Field
The invention relates to the technical field of creep tests, in particular to a test fixture for a test sample with an internal pressure pipe. Also relates to a creep test device.
Background
The creep test is a material mechanical property test and is used for measuring the slow plastic deformation phenomenon of a sample under the action of constant temperature and constant stress for a long time. The higher the temperature or the higher the stress, the more pronounced the creep phenomenon. Creep can occur under a single stress (tensile, compressive or torsional) as well as under a composite stress. Typical creep tests are conducted under uniaxial tensile conditions.
In a specific creep test, a mechanical property test of a tube sample is required to be performed under a high-temperature vacuum environment at 300 ℃ to 600 ℃ to measure the mechanical property of the tube sample. The conventional creep test device is provided with a clamp for clamping the whole pipe, but only can realize the clamping and stretching capacity of a pipe sample, cannot meet the test requirement of an internally-inflated internal pressure pipe sample, and cannot perform a biaxial creep test of the pipe sample in a high-temperature environment range of 300-600 ℃ under a vacuum inflation condition.
Therefore, how to provide a test fixture for a test specimen with an internal pressure pipe, which solves the above technical problems, is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a test fixture for an internal pressure pipe sample, which is used for clamping the pipe sample for introducing pressure under high-temperature conditions. Another object of the present invention is to provide a creep test apparatus.
In order to achieve the purpose, the invention provides a test fixture for a test sample with an internal pressure pipe, which comprises a connecting sleeve, wherein the first end of the connecting sleeve is used for being connected with a pull rod, the second end of the connecting sleeve is provided with a fixture body for clamping the test sample with the pipe, the connecting sleeve is provided with a joint, the first end of the joint is communicated with the test sample with the pipe, and the second end of the joint extends out of the connecting sleeve.
Preferably, the connecting sleeve is cut open between the first end and the second end, and the joint is installed in the space cut open by the connecting sleeve.
Preferably, an installation cavity is arranged inside the clamp body, a tube sample clamping block is assembled in the installation cavity, and the tube sample clamping block clamps the tube sample.
Preferably, the mounting cavity has a tapered shape with a tapered cross section, the end of the mounting cavity has a minimum cross section, and the tube sample clamping block has an inclined surface which is matched with the mounting cavity.
Preferably, the tube sample clamping block further comprises a locking nut, and the locking nut locks the tube sample clamping block.
Preferably, the locking nut is locked to the head end of the mounting cavity.
Preferably, the test tube further comprises a cushion block, and the cushion block is arranged between the locking nut and the tube sample clamping block.
Preferably, the tube sample clamping block is provided with a tube sample stopper, and the tube sample stopper is arranged in the tube sample clamping block.
Preferably, the pull rod further comprises a pin, and the first end of the connecting sleeve is connected with the pull rod through the pin.
The invention also provides a creep test device which comprises the test fixture for the test sample with the internal pressure pipe.
Compared with the background art, the test fixture for the test sample with the internal pressure pipe comprises the connecting sleeve and the fixture body, wherein the first end of the connecting sleeve is connected with the pull rod, the fixture body is arranged at the second end of the connecting sleeve, the connecting sleeve is provided with the joint, the first end of the joint is communicated with the test sample, and the second end of the joint extends out of the connecting sleeve.
The test fixture for the test sample with the internal pressure pipe is used in combination with a creep test device, and the test fixture is used for clamping the pipe sample; in the test, gas is introduced into the tube sample through the joint, so that pressure is introduced into the tube sample, and the mechanical property test of the high-temperature material under the vacuum inflation condition is realized by combining the high-temperature condition of the test.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a test fixture for an internal pressure pipe test specimen according to an embodiment of the present invention.
Wherein:
the device comprises a pull rod 1, a pin 2, a connecting sleeve 3, a joint 4, a locking nut 5, a cushion block 6, a tube sample stopper 7, a clamp body 8, a tube sample clamping block 9 and a tube sample 10.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a test fixture for a sample with an internal pressure tube according to an embodiment of the present invention.
In a first specific embodiment, the invention provides a test fixture for an internal pressure tube sample, which is used for clamping a tube sample 10 in a creep test, wherein the clamped tube sample 10 is the tube sample 10 with internal pressure, and gas can be introduced into the tube sample 10 to form a vacuum/inflation environment, so that the mechanical property test of a high-temperature material under a vacuum inflation condition is realized.
Otherwise, the above test fixture is also applicable to clamping and testing of the tube sample 10 without introducing gas, and shall fall within the scope of the description of the present embodiment; therefore, the test jig can hold the tube sample 10 in both cases.
Specifically, the test fixture comprises a connecting sleeve 3 and a fixture body 8, wherein a first end of the connecting sleeve 3 is connected with the pull rod 1, and the fixture body 8 is arranged at a second end of the connecting sleeve 3; the connecting sleeve 3 is provided with a joint 4, a first end of the joint 4 is communicated with the tube sample 10, and a second end of the joint 4 extends out of the connecting sleeve 3.
In this embodiment, the test fixture is used in combination with a creep test apparatus, the first end of the connection sleeve 3 is assembled to the pull rod 1, the tube sample 10 is clamped to the fixture body 8 at the second end of the connection sleeve 3, and the tube sample 10 is introduced with gas through the joint 4 of the connection sleeve 3. During the experiment, the quantity of pull rod 1 is a pair of and the subtend setting, and every pull rod 1 all sets up above-mentioned test fixture, and the upper and lower both ends of pipe sample 10 are fixed through two test fixtures respectively, and the pulling effect through a pair of pull rod 1 is pulled two sets of connecting sleeve 3 and anchor clamps body 8 respectively to the pipe sample 10 to the centre gripping is stretched.
It should be noted that the test fixture is a test fixture suitable for in-band pressure tensile creep of the high-temperature tube sample 10 in a vacuum/inflation environment, and is used for clamping the tube sample 10 in a mechanical property test of a high-temperature material in a high-temperature environment range of 300 ℃ to 600 ℃ under a vacuum inflation condition. Different from a traditional clamp, in the test, gas can be introduced into the tube sample 10 through the joint 4, so that pressure is introduced into the tube sample 10, and the high-temperature condition of the test is combined, so that the mechanical property test of the high-temperature material under the vacuum inflation condition is realized.
Besides, in the assembling connection of the connecting sleeve 3 and the pull rod 1, the test fixture further comprises a pin 2, and the first end of the connecting sleeve 3 is connected with the pull rod 1 through the pin 2.
In this embodiment, when the pair of pull rods 1 pull the test fixture in a state of being away from each other, the pull rods 1 transmit the pulling force to the connection sleeve 3 and the fixture body 8 through the pins 2, so that the upper and lower ends of the tube sample 10 are subjected to the pulling force in opposite directions, thereby stretching the clamped tube sample 10.
On the basis, as shown in fig. 1, taking a test fixture at the upper end of a tube sample 10 as an example, the test fixture comprises a pull rod 1, a pin 2, a connecting sleeve 3, a joint 4 and a fixture body 8 which are arranged from top to bottom in sequence; wherein, connecting sleeve 3 cuts open the sky between its first end (upper end) and second end (lower extreme), that is to say, connecting sleeve 3's middle part is cut open, connects 4 to install in connecting sleeve 3 cuts open the empty space, is convenient for observe the operating condition of inside components and parts and to connect 4 to load and unload and change.
It should be noted that the joint 4 in this embodiment is used to communicate the tube specimen 10 with an external gas supply device, so as to realize the configuration of the gas environment inside the tube specimen 10, and therefore the joint of the joint 4 and the tube specimen 10 should be kept sealed; in addition, the joint 4 should be fixedly installed inside the connecting sleeve 3, and the sealed connection relationship between the joint 4 and the tube sample 10 should not affect the stretching of the tube sample 10; the joint 4 may be removably fitted for replacement.
Illustratively, in one embodiment of the clamp body 8, a mounting cavity is provided inside the clamp body 8, a tube sample clamping block 9 is assembled in the mounting cavity, and the tube sample clamping block 9 clamps a tube sample 10.
In this embodiment, the tube sample clamping block 9 is used for clamping the tube sample 10, and the number of the tube sample clamping blocks 9 is not limited; preferably, the tube specimen clamping block 9 in the installation cavity surrounds and clamps the tube specimen 10 at the periphery of the tube specimen 10, and the axis of the tube specimen 10 is collinear with the axis of the test fixture, namely the axis of the fixture body 8.
Further, the mounting cavity has a tapered shape with a tapered cross section, the end of the mounting cavity has a minimum cross section, and the tube sample clamping block 9 has an inclined surface which is matched with the mounting cavity.
In the present embodiment, the number of the tube sample clamping blocks 9 is taken as an example, and includes but is not limited to two and more than two; when the device is used, the plurality of tube sample clamping blocks 9 are arranged in the installation cavity, the outer surfaces of the tube sample clamping blocks 9 are inclined surfaces matched with the installation cavity, and the inner surfaces of the tube sample clamping blocks 9 are attached to clamp the tube samples 10. The inner surface of the tube sample clamping block 9 may be an arc surface fitted with the contour of the tube sample 10, and a rough surface for increasing contact friction and an elastic member for protecting the contact surface may be further added, which also belongs to the description scope of the present embodiment.
It should be noted that, because of the conical shape of the installation cavity from the first end (upper end) to the second end (lower end) convergent, when in use, the self-locking feature is provided: along with the pulling of the pull rod 1, the tube sample clamping block 9 locks and tightens the tube sample 10, so that the tube sample 10 is stably and reliably clamped in the test process.
On the basis, in the locking of the tube sample clamping block 9, the test fixture further comprises a locking nut 5, the locking nut 5 is of a hollow structure so that the tube sample 10 can penetrate through the rear connecting joint 4, the tube sample clamping block 9 is locked from top to bottom through the locking nut 5, and when the tube sample clamping block 9 is locked, the upward movement of the tube sample clamping block is limited, so that the tube sample 10 is locked more and more downwards under the action of a cone.
Exemplarily, the head end of the installation cavity of the clamp body 8 has the largest cross section, an internal thread is arranged at the head end of the installation cavity, the locking nut 5 is provided with an external thread, the locking nut 5 is locked at the head end of the installation cavity from top to bottom, the tube sample clamping block 9 is continuously downward along with the locking of the locking nut 5, the outside of the tube sample clamping block 9 is acted by the tapered installation cavity, the space inside the tube sample clamping block 9 is smaller, and the clamping of the tube sample 10 is tighter.
Further, the test tube sample clamp device further comprises a cushion block 6, and the cushion block 6 is arranged between the locking nut 5 and the tube sample clamping block 9.
In the embodiment, the locking nut 5 is manually provided with pretightening force, and when the locking nut 5 is locked downwards, the cushion block 6 transmits the downward action of the locking nut 5 to the pipe sample clamping block 9; the cushion block 6 is of a hollow structure, so that the pipe sample 10 sequentially penetrates through the cushion block 6 and the lock nut 5, the cushion block 6 is used for adjusting the distance between the lock nut 5 and the pipe sample clamping block 9, and the thickness of the cushion block 6 is set according to the distance between the lock nut 5 and the pipe sample clamping block 9.
For better technical effect, the device also comprises a tube sample stopper 7, and the tube sample stopper 7 is arranged in the position of the tube sample 10 in the tube sample clamping block 9.
In the present embodiment, the tube sample stopper 7 is built in a position where the tube sample 10 is clamped by the tube sample clamping block 9, and functions to maintain the shape of the tube sample 10 at this position and prevent the tube sample 10 from being clamped and deformed.
The invention also provides a creep test device which comprises the test fixture for the test sample with the internal pressure pipe, wherein the test fixture is symmetrically arranged at the upper end and the lower end of the pipe sample 10, and the pipe sample 10 can be connected with an external air source to fill pressure gas into the sample, so that the tensile working condition during the inflation of the inside of the pipe sample is realized.
In the present embodiment, the creep test apparatus should have all the advantages of the test fixture for the sample with the internal pressure pipe, and the description thereof is omitted.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The creep test device and the test fixture for the internal pressure pipe test sample provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a test fixture for taking internal pressure pipe sample, its characterized in that includes connecting sleeve (3), the first end of connecting sleeve (3) is used for being connected with pull rod (1), the second end setting of connecting sleeve (3) presss from both sides the anchor clamps body (8) of clamping with pipe sample (10), connecting sleeve (3) are equipped with and connect (4), the first end that connects (4) with pipe sample (10) switch-on, the second end that connects (4) stretches out connecting sleeve (3).
2. Test fixture for internal pressure pipe test specimens according to claim 1, characterized in that the connecting sleeve (3) is hollow between its first and second ends, the joint (4) being fitted in the hollow space of the connecting sleeve (3).
3. The test fixture for the test specimen with the internal pressure pipe according to claim 1, characterized in that the interior of the fixture body (8) is provided with a mounting cavity, a pipe specimen clamping block (9) is assembled in the mounting cavity, and the pipe specimen clamping block (9) clamps the pipe specimen (10).
4. Test fixture for in-band pressure pipe specimens according to claim 3, characterized in that the mounting cavity has a tapered shape with a tapered cross section, the end of the mounting cavity has a minimum cross section, and the pipe specimen clamping block (9) has an inclined surface that cooperates with the mounting cavity.
5. The test fixture for internal pressure pipe specimens according to claim 4, further comprising a locking nut (5), wherein the locking nut (5) locks the pipe specimen clamping block (9).
6. Test fixture for internal pressure pipe test specimens according to claim 5, characterized in that the locking nut (5) is locked to the head end of the installation cavity.
7. The test fixture for an internal pressure pipe specimen according to claim 6, further comprising a spacer block (6), wherein the spacer block (6) is disposed between the lock nut (5) and the pipe specimen clamping block (9).
8. The test fixture for in-band pressure pipe specimens according to any of claims 3 to 7, characterized by further comprising a pipe specimen stopper rod (7), wherein the pipe specimen stopper rod (7) is built in the pipe specimen (10) at a position in the pipe specimen clamping block (9).
9. The test fixture for an internal pressure pipe test specimen according to any one of claims 1 to 7, characterized by further comprising a pin (2), wherein the first end of the connecting sleeve (3) is connected with the pull rod (1) through the pin (2).
10. A creep test apparatus comprising a test fixture for an internal pressure pipe specimen according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111517596.9A CN114279823A (en) | 2021-12-13 | 2021-12-13 | Creep test device and test fixture for in-band pressure pipe sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111517596.9A CN114279823A (en) | 2021-12-13 | 2021-12-13 | Creep test device and test fixture for in-band pressure pipe sample |
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| Publication Number | Publication Date |
|---|---|
| CN114279823A true CN114279823A (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111517596.9A Pending CN114279823A (en) | 2021-12-13 | 2021-12-13 | Creep test device and test fixture for in-band pressure pipe sample |
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| CN (1) | CN114279823A (en) |
Citations (7)
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| JP2007286036A (en) * | 2005-12-01 | 2007-11-01 | National Institute For Materials Science | Material testing device and material test piece |
| CN103245569A (en) * | 2013-04-28 | 2013-08-14 | 华北电力大学 | Material test method and system for high-temperature gas corrosion and creep |
| CN103528884A (en) * | 2013-09-10 | 2014-01-22 | 中国科学院理化技术研究所 | Test sample clamping device for low-temperature tensile property test |
| CN103630447A (en) * | 2013-11-29 | 2014-03-12 | 沈阳黎明航空发动机(集团)有限责任公司 | High-temperature tensile testing method for whole metal pipe and special fixture used in high-temperature tensile testing method |
| CN203908882U (en) * | 2014-06-25 | 2014-10-29 | 苏州热工研究院有限公司 | Special measurement device for creep property of nuclear zirconium alloy tubing |
| CN106153472A (en) * | 2016-06-17 | 2016-11-23 | 华北电力大学 | A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads |
| CN112362493A (en) * | 2020-09-30 | 2021-02-12 | 中汽研（天津）汽车工程研究院有限公司 | Control method for hot compression test of thin plate |
-
2021
- 2021-12-13 CN CN202111517596.9A patent/CN114279823A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007286036A (en) * | 2005-12-01 | 2007-11-01 | National Institute For Materials Science | Material testing device and material test piece |
| CN103245569A (en) * | 2013-04-28 | 2013-08-14 | 华北电力大学 | Material test method and system for high-temperature gas corrosion and creep |
| CN103528884A (en) * | 2013-09-10 | 2014-01-22 | 中国科学院理化技术研究所 | Test sample clamping device for low-temperature tensile property test |
| CN103630447A (en) * | 2013-11-29 | 2014-03-12 | 沈阳黎明航空发动机(集团)有限责任公司 | High-temperature tensile testing method for whole metal pipe and special fixture used in high-temperature tensile testing method |
| CN203908882U (en) * | 2014-06-25 | 2014-10-29 | 苏州热工研究院有限公司 | Special measurement device for creep property of nuclear zirconium alloy tubing |
| CN106153472A (en) * | 2016-06-17 | 2016-11-23 | 华北电力大学 | A kind of realize multi-axial creep pilot system and the method that intrinsic pressure and stretching combinations loads |
| CN112362493A (en) * | 2020-09-30 | 2021-02-12 | 中汽研（天津）汽车工程研究院有限公司 | Control method for hot compression test of thin plate |
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