CN113848139B - Circulating loading fatigue experiment device for pipeline bending moment - Google Patents
Circulating loading fatigue experiment device for pipeline bending moment Download PDFInfo
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- CN113848139B CN113848139B CN202111108548.4A CN202111108548A CN113848139B CN 113848139 B CN113848139 B CN 113848139B CN 202111108548 A CN202111108548 A CN 202111108548A CN 113848139 B CN113848139 B CN 113848139B
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- 238000005452 bending Methods 0.000 title claims abstract description 53
- 238000002474 experimental method Methods 0.000 title abstract description 4
- 230000005540 biological transmission Effects 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000009661 fatigue test Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 2
- 238000013001 point bending Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The embodiment of the invention discloses a cyclic loading fatigue experiment device for pipeline bending moment, which comprises a pipeline end fixing structure, a bending moment loading structure and a water pressure loading structure; the pipeline end fixing structure comprises a transmission cavity, a universal ball and a connecting structure, and the transmission cavity, the universal ball and the connecting structure are matched to form a through liquid channel; the water pressure loading structure comprises a high-pressure water supply mechanism and a high-pressure water pipe; the bending moment loading structure comprises a reaction frame, a rotating ball and a driving piece, one side, facing the pipeline end fixing structure, of the rotating ball is connected with a connecting rod assembly, and an included angle is formed between a connecting line between a connecting point on the universal ball and the rotating ball and the axis of the connecting rod assembly. According to the invention, one end of the pipeline is rotatably fixed through the pipeline end fixing structure, and the cyclic loading of high-frequency and pure bending moment is realized based on the arrangement of the bending moment loading structure at the other end, so that the integral bending moment record can be realized, and the defect of a conventional four-point bending loading device is avoided.
Description
Technical Field
The embodiment of the invention relates to the technical field of pipeline bending moment loading devices, in particular to a cyclic loading fatigue experiment device for pipeline bending moment.
Background
With the development of ocean resources, not only are the traditional industries such as deep sea farming industry and the like paid greater attention to, but also deep sea mining and deep sea oil fields are researched by countries around the world. Marine risers are widely used in marine engineering as a reliable and inexpensive means of transportation. The vertical pipe is usually connected with the offshore drilling platform and the submarine pipeline, the offshore drilling platform is influenced by ocean environments such as waves, wind loads, internal waves and the like, reciprocating motion can occur on the sea surface, and meanwhile, due to the design requirements and the influence of an anchor chain, the tension of the platform on the vertical pipe is usually in a safe range. However, as time passes, under the action of long-time cyclic load, the internal micro-structural cracks of the pipeline can develop into large cracks, so that the pipeline is locally damaged and broken, and even serious collapse can occur. So it is important to study the fatigue failure of the pipeline for the design safety of the pipeline.
When the marine riser contacts the sea floor, the pipeline is subjected to significant bending moment loads. In the operation process of the offshore platform, the repeated platform movement drives the pipeline to float up and down, so that the submarine pipeline is subjected to larger circulating bending moment load. The existing bending moment fatigue devices are mostly four-point bending loading devices, stress concentration at bending positions is large, and main influencing factors cannot be effectively judged. Meanwhile, the existing loading device is loaded by utilizing a hydraulic oil cylinder, the bending moment loading stroke is limited, the frequency cannot be increased due to overheat of the oil cylinder, and the test time is long.
Disclosure of Invention
Therefore, the embodiment of the invention provides the cyclic loading fatigue experimental device for the bending moment of the pipeline, which is characterized in that one end of the pipeline is rotatably fixed through the fixed structure at the end of the pipeline, and the cyclic loading of high-frequency and pure bending moment is realized based on the arrangement of the bending moment loading structure at the other end of the pipeline, and meanwhile, the integral bending moment record can be realized, so that the defects of the conventional four-point bending loading device are avoided.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
In one aspect of the embodiment of the invention, a cyclic loading fatigue test device for pipeline bending moment is provided, which comprises a pipeline end fixing structure arranged at one end, a bending moment loading structure arranged at the other end and a water pressure loading structure communicated with the pipeline end fixing structure, wherein a placing gap for placing a pipeline to be tested is formed between the pipeline end fixing structure and the bending moment loading structure; wherein,
The pipeline end fixing structure comprises a transmission cavity, a universal ball and a connecting structure, wherein the transmission cavity is internally provided with a cavity and is provided with an opening, the universal ball is rotatable and is sealed, the universal ball is arranged in a sealing mode, the connecting structure is arranged to extend outwards from the universal ball and is used for connecting a pipeline to be tested, and a through liquid channel is formed by the cooperation of the transmission cavity, the universal ball and the connecting structure;
the water pressure loading structure comprises a high-pressure water supply mechanism and a high-pressure water pipe which is communicated with the high-pressure water supply mechanism and the transmission cavity;
The bending moment loading structure comprises a reaction frame formed with a ball groove, a rotating ball rotatably arranged in the ball groove, a driving piece connected to the rotating ball and used for driving the rotating ball to rotate in the ball groove, a connecting rod assembly connected to one side of the rotating ball, facing to the pipeline end fixing structure, of the rotating ball, and an included angle formed between a connecting line between a universal ball and a connecting point on the rotating ball and an axis of the connecting rod assembly.
As a preferred aspect of the present invention, the connection structure includes a connection pipe extending outward from the universal ball, and a first mounting flange provided at an end of the connection pipe remote from the universal ball; and, in addition, the method comprises the steps of,
The center of the first mounting flange is formed to be penetrated.
As a preferred mode of the present invention, the pipe end fixing structure further includes a mounting bracket, and the transmission chamber is provided on the mounting bracket.
As a preferred embodiment of the invention, the mounting bracket is arranged to be adjustable in height.
As a preferable scheme of the invention, the driving piece comprises a supporting frame, a servo motor arranged on the supporting frame, a brake gear connected to the output end of the servo motor, a transmission gear meshed with the brake gear and rotatably arranged, and a dowel bar eccentrically arranged on the transmission gear, wherein one end of the dowel bar, which is far away from the transmission gear, is connected to the rotating ball.
As a preferred aspect of the present invention, the connecting rod assembly includes a force guide rod connected to the swivel ball, and a second mounting flange connected to an end of the force guide rod remote from the swivel ball.
As a preferred embodiment of the invention, the force transmission rod is parallel to the axis of the force transmission rod or is located on the same straight line.
As a preferable mode of the invention, the ball groove is the same as the axis of the rotary ball, a limit protrusion is formed in the ball groove, and a limit groove which is embedded with the limit protrusion is formed on the rotary ball, so that the rotating shaft of the rotary ball is not overlapped with the axis of the ball groove.
As a preferable mode of the invention, the water pressure loading structure further comprises a booster pump, and the booster pump is used for keeping the pressure in the pipeline to be tested constant.
As a preferred embodiment of the present invention, the brake gear and the transmission gear are engaged by a transmission assembly.
Embodiments of the present invention have the following advantages:
According to the embodiment of the invention, the loading of the high-frequency circulating bending moment of the pipeline to be tested is realized through the cooperation of the pipeline end fixing structure and the bending moment loading structure; further, through the cooperation of the hydraulic loading structure, the synchronous loading of the internal pressure and the bending moment is realized, and the simulation reality of the whole cyclic loading is improved; meanwhile, the synchronous matching of the rotating ball and the driving piece avoids the traditional four-point bending loading mode, overcomes the influence of stress concentration on the fatigue life of the pipeline caused by the traditional mode, and realizes pure bending moment loading.
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 will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.
FIG. 1 is a schematic structural diagram of a cyclic loading fatigue test device provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a partial structure of a cyclic loading fatigue test device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a driving member according to an embodiment of the present invention.
In the figure:
1-a pipeline end fixing structure; 2-a hydraulic loading structure; 3-a pipeline to be tested; 4-a bending moment loading structure;
11-a transfer chamber; 12-a universal ball; 13-connecting pipes; 14-a first mounting flange; 15-mounting a bracket;
21-a high-pressure water pipe;
41-a reaction frame; 42-spin ball; 43-driving member; 44-a force-guiding rod; 45-a second mounting flange;
431-supporting frame; 432-a servo motor; 433-brake gear; 434-a drive gear; 435-a limiting hole; 436-dowel bar.
Detailed Description
Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Further explanation is provided below by way of specific examples.
As shown in fig. 1, the invention provides a cyclic loading fatigue test device for pipeline bending moment, which comprises a pipeline end fixing structure 1 arranged at one end, a bending moment loading structure 4 arranged at the other end, and a water pressure loading structure 2 communicated with the pipeline end fixing structure 1, wherein a placing gap for placing a pipeline 3 to be tested is formed between the pipeline end fixing structure 1 and the bending moment loading structure 4. Wherein, the two ends of the pipeline 3 to be tested are respectively welded with a connecting flange, and the two ends are respectively detachably connected with the first mounting flange 14 and the second mounting flange 45 through the connecting flanges, the water pressure loading structure 2 conveys high-pressure water in the high-pressure water supply mechanism into the pipeline 3 to be tested through the high-pressure water pipe 21 therein, and after the input is completed, the circulating bending moment can be applied to the pipeline 3 to be tested through the starting bending moment loading structure 4. And moreover, the bending moment loading structure 4 is adopted to convert the force in the rotation direction into surrounding force to load the bending moment, so that the problems of limited bending moment travel and the like caused by the conventional loading of the bending moment by adopting a hydraulic telescopic mode are greatly avoided.
As shown in fig. 2, the pipe end fixing structure 1 includes a transmission cavity 11 with an opening formed therein, a universal ball 12 rotatably closing the opening, and a connection structure extending outwardly from the universal ball 12 for connecting the pipe 3 to be tested, wherein the transmission cavity 11, the universal ball 12 and the connection structure cooperate to form a through liquid channel. In the actual working process, the water pressure loading structure 2 inputs high-pressure water into the transmission cavity 11 through the high-pressure water pipe 21, flows to the universal ball 12, and finally flows into the pipeline 3 to be tested. The center of the first mounting flange 14 for connecting the pipe 3 to be measured is provided with a hollow, so that water can flow into the pipe 3 to be measured through the first mounting flange 14, and the pressure from inside to outside is applied to the pipe 3 to be measured. The force-transmitting rod 44 and the force-transmitting rod 436 of the driving member 43 are completely fixedly connected to the rotary ball 42 of the reaction frame 41, and the rotary ball 42 is formed with threads that engage with the inner surface of the reaction frame 41, thereby restricting the rotation of the rotary ball 42 in the axial direction of the ball groove of the reaction frame 41 (here, both ends of the ball groove are formed as openings, and thus, the axial direction here, i.e., the axis formed from one end of the opening to the other end thereof), without restricting the rotation of the rotary ball 42 in other directions. Through the design, the axial rotation of the pipeline 3 to be tested is effectively limited, so that the bending moment direction of the pipeline 3 to be tested can be changed all the time under the driving action of the driving piece 43, and the purpose of circulating bending moment is achieved. Meanwhile, the arrangement mode is based on the cooperation rotation of the two ends, so that the adjustment of the local bending moment of the conventional four-point bending is avoided, and the problems of uneven stress of the pipeline 3 to be tested caused by stress concentration are avoided.
As shown in fig. 3, the driving member 43 of the bending moment loading structure 4 includes a supporting frame 431 (may be specifically selected as a reaction frame structure), a servo motor 432 disposed on the supporting frame 431, a brake gear 433 connected to an output end of the servo motor 432, a transmission gear 434 engaged with the brake gear 433 and rotatably disposed, and a force transmission rod 436 eccentrically disposed on the transmission gear 434, wherein one end of the force transmission rod 436 far from the transmission gear 434 is connected to the rotary ball 42. Of course, the limiting hole 435 may be eccentrically provided on the driving gear 434, and the force transmission rod 436 passes through the limiting hole 435 and is not connected with the limiting hole so that it can rotate in the limiting hole 435. In the working state, the servo motor 432 drives the brake gear 433 to rotate, the brake gear 433 drives the transmission gear 434 to rotate, and simultaneously the dowel bar 436 rotates around the axis, and further drives the rotary ball 42 to rotate in the ball groove, so that the force guide rod 44 effectively rotates around, and the cyclic bending moment loading is provided for the pipeline 3 to be tested.
While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (8)
1. The cyclic loading fatigue test device for the pipeline bending moment is characterized by comprising a pipeline end fixing structure (1) arranged at one end of the cyclic loading fatigue test device, a bending moment loading structure (4) arranged at the other end of the cyclic loading fatigue test device, and a water pressure loading structure (2) communicated with the pipeline end fixing structure (1), wherein a placing gap for placing a pipeline (3) to be tested is formed between the pipeline end fixing structure (1) and the bending moment loading structure (4); wherein,
The pipeline end fixing structure (1) comprises a transmission cavity (11) with an opening, a universal ball (12) which can rotate and seal the opening, and a connecting structure which is arranged outside the universal ball (12) in an extending manner and is used for connecting a pipeline (3) to be tested, wherein the transmission cavity (11), the universal ball (12) and the connecting structure are matched to form a through liquid channel;
The water pressure loading structure (2) comprises a high-pressure water supply mechanism and a high-pressure water pipe (21) which is communicated with the high-pressure water supply mechanism and the transmission cavity (11);
The bending moment loading structure (4) comprises a counter-force frame (41) formed with a ball groove, a rotary ball (42) rotatably arranged in the ball groove, a driving piece (43) connected to the rotary ball (42) and used for driving the rotary ball (42) to rotate in the ball groove, a connecting rod assembly is connected to one side of the rotary ball (42) facing the pipeline end fixing structure (1), and an included angle is formed between a connecting line between the universal ball (12) and a connecting point on the rotary ball (42) and the axis of the connecting rod assembly;
the connecting structure comprises a connecting pipe (13) extending outwards from the universal ball (12), and a first mounting flange (14) arranged at one end of the connecting pipe (13) far away from the universal ball (12); and, in addition, the method comprises the steps of,
The center of the first mounting flange (14) is formed to be penetrated;
The connecting rod assembly includes a force-guiding rod (44) connected to the swivel ball (42), and a second mounting flange (45) connected to an end of the force-guiding rod (44) remote from the swivel ball (42).
2. A cyclic loading fatigue testing device for pipe bending moments according to claim 1, characterized in that the pipe end fixing structure (1) further comprises a mounting bracket (15), the transfer chamber (11) being arranged on the mounting bracket (15).
3. A cyclic loading fatigue testing device for pipe bending moments according to claim 2, characterized in that the mounting bracket (15) is arranged adjustable in height.
4. A cyclic loading fatigue testing device for pipe bending moment according to any of claims 1-3, wherein the driving member (43) comprises a supporting frame (431), a servo motor (432) arranged on the supporting frame (431), a brake gear (433) connected to an output end of the servo motor (432), a transmission gear (434) meshed with the brake gear (433) and rotatably arranged, and a dowel bar (436) eccentrically arranged on the transmission gear (434), and one end of the dowel bar (436) away from the transmission gear (434) is connected to the rotary ball (42).
5. A cyclic loading fatigue testing device for pipe bending moment according to claim 4, wherein the dowel bar (436) is parallel or co-linear with the axis of the force guide bar (44).
6. The cyclic loading fatigue test device for pipe bending moment according to claim 5, wherein the ball groove is the same as the axis of the rotary ball (42), a limit protrusion is formed in the ball groove, and a limit groove jogged with the limit protrusion is formed on the rotary ball (42) so that the rotation axis of the rotary ball (42) is not coincident with the axis of the ball groove.
7. A cyclic loading fatigue testing device for pipe bending moment according to claim 1, wherein the hydraulic loading structure (2) further comprises a booster pump, and the booster pump is used for keeping the pressure in the pipe (3) to be tested constant.
8. The cyclic loading fatigue testing device for pipe bending moment according to claim 4, wherein the brake gear (433) and the transmission gear (434) are engaged by a transmission assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108548.4A CN113848139B (en) | 2021-09-22 | 2021-09-22 | Circulating loading fatigue experiment device for pipeline bending moment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108548.4A CN113848139B (en) | 2021-09-22 | 2021-09-22 | Circulating loading fatigue experiment device for pipeline bending moment |
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| CN113848139A CN113848139A (en) | 2021-12-28 |
| CN113848139B true CN113848139B (en) | 2024-05-03 |
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Citations (10)
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| GB530418A (en) * | 1939-06-23 | 1940-12-11 | Carl Schenck Eisengiesserei Un | Improvements in fatigue testing machines |
| GB748787A (en) * | 1953-07-14 | 1956-05-09 | Nat Res Dev | Improvements in and relating to fatigue testing machines |
| FR2552547A1 (en) * | 1983-09-22 | 1985-03-29 | Seram | Machine for alternating flexion or torsion tests with a constant amplitude of the force or with constant amplitude of deformation |
| JPH06235689A (en) * | 1993-02-09 | 1994-08-23 | Nippon Telegr & Teleph Corp <Ntt> | Fatigue test method |
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-
2021
- 2021-09-22 CN CN202111108548.4A patent/CN113848139B/en active Active
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| CN112161882A (en) * | 2020-08-25 | 2021-01-01 | 浙江盛洋科技股份有限公司 | Accelerated anti-fatigue cable testing process |
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| CN113848139A (en) | 2021-12-28 |
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