CN113848134A - Fatigue test method for circularly applying bending moment to pipeline - Google Patents
Fatigue test method for circularly applying bending moment to pipeline Download PDFInfo
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- CN113848134A CN113848134A CN202111106969.3A CN202111106969A CN113848134A CN 113848134 A CN113848134 A CN 113848134A CN 202111106969 A CN202111106969 A CN 202111106969A CN 113848134 A CN113848134 A CN 113848134A
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- 238000005452 bending Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009661 fatigue test Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 238000011068 loading method Methods 0.000 claims abstract description 33
- 230000033001 locomotion Effects 0.000 claims abstract description 6
- 125000004122 cyclic group Chemical group 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 10
- 238000012360 testing method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013001 point bending Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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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
-
- 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
- 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
Abstract
The embodiment of the invention discloses a fatigue test method for applying bending moment to pipeline circulation, which comprises the following steps: s100, rotatably arranging one end of the pipeline to be measured by taking a preset point as a center; s200, connecting the other end of the pipeline to be tested to a driving structure which can perform circular motion by taking a line parallel to connecting lines at two ends of the pipeline to be tested as a central line; s300, introducing high-pressure water into the pipeline to be detected; s400, starting a driving structure under an initial condition to enable the pipeline to be tested to operate in an initial bending moment loading state; s500, when the pipeline to be tested reaches a preset stable value, adjusting the driving structure to a working condition, and circularly applying a working bending moment to the pipeline to be tested. Through the arrangement, the multidirectional cyclic loading of the integral bending moment of the pipeline to be tested and the synchronous loading of the internal pressure are realized, and compared with the existing loading device, the loading device has a more stable loading effect.
Description
Technical Field
The embodiment of the invention relates to the technical field of bending moment loading methods of pipelines, in particular to a fatigue test method for circularly applying bending moment to a pipeline.
Background
With the development of marine resources, not only the traditional industries such as deep sea farming industry and the like have attracted more attention, but also deep sea mining and deep sea oil fields have been researched by countries all over the world. Marine risers are widely used in marine engineering as a reliable and inexpensive means of transportation. The riser is usually connected between the offshore drilling platform and the submarine pipeline, the offshore drilling platform is influenced by sea 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 riser is usually in a safe range. However, with the lapse of time, the internal micro-structural cracks of the pipeline can be developed into large cracks under the action of long-time cyclic load, and further the pipeline is locally damaged and broken, and even the pipeline can be seriously cracked. It is important to the design safety of the pipeline to study fatigue failure of the pipeline.
When the marine riser contacts the seabed, the pipeline is subjected to a large bending moment load. In the process of offshore platform operation, the repeated platform movement drives the pipeline to float up and down, so that the submarine pipeline is subjected to larger cyclic bending moment load. The existing bending moment fatigue experiment mode is mostly that the local of pipeline is applied with bending moment by adopting a four-point bending loading device, so that the stress concentration of the bending position is large, and the main influence factor can not be effectively judged. Simultaneously, the current loading device who adopts above-mentioned mode mostly utilizes hydraulic cylinder loading, and moment of flexure loading stroke is limited, and because the overheated reason of hydro-cylinder, the frequency can't promote, and test time is longer, and then the fatigue test's that causes limitation leads to the operation that can't carry out fatigue test steadily for a long time.
Disclosure of Invention
Therefore, the embodiment of the invention provides a fatigue test method for applying bending moment to a pipeline in a circulating manner, wherein one end of a pipeline to be tested is rotatably arranged by taking a preset point as a center, so that the one end of the pipeline to be tested is effectively limited, on the basis, the other end of the pipeline to be tested is driven by a driving structure to take a central line as a shaft to perform surrounding movement, and high-pressure water is introduced into the shaft, so that the multi-directional circulating loading of the integral bending moment of the pipeline to be tested and the synchronous loading of internal pressure are realized, and compared with the existing loading device, the loading device has a more stable loading effect.
In order to achieve the above object, an embodiment of the present invention provides the following:
in one aspect of the embodiments of the present invention, there is provided a fatigue test method for applying a bending moment to a pipe cycle, including:
s100, rotatably arranging one end of the pipeline to be measured by taking a preset point as a center;
s200, connecting the other end of the pipeline to be tested to a driving structure which can perform circular motion by taking a line parallel to connecting lines at two ends of the pipeline to be tested as a central line;
s300, introducing high-pressure water into the pipeline to be detected;
s400, starting a driving structure under an initial condition to enable the pipeline to be tested to operate in an initial bending moment loading state;
s500, when the pipeline to be tested reaches a preset stable value, adjusting the driving structure to a working condition, and circularly applying a working bending moment to the pipeline to be tested.
As a preferable aspect of the present invention, the initial condition and the operating condition include at least a rotation speed of the driving structure, and the rotation speed in the initial condition is smaller than the rotation speed in the operating condition.
As a preferable scheme of the present invention, in step S200, a surrounding distance is formed between the center line and a connecting line at two ends of the pipe to be tested, the end portion of the driving structure far from the other end of the pipe to be tested in the center line is used as a surrounding center, and the surrounding end of the driving structure is connected to the other end of the pipe to be tested.
As a preferable scheme of the present invention, the step S400 and the step S500 further include performing pressure maintaining control on the pressure in the pipe to be measured.
As a preferable aspect of the present invention, the pressure holding control is to constantly adjust the internal pressure in the pipe to be measured by using a pressure holding function of the pressure pump.
As a preferable embodiment of the present invention, the introducing of the high-pressure water in step S300 at least includes:
s301, sequentially communicating and arranging a buffer area and an access area between the high-pressure water supply structure and the pipeline to be tested;
s302, respectively opening a first passage between the high-pressure water supply structure and the buffer section and a second passage between the buffer section and the access section, and enabling the opening area of the first passage to be smaller than that of the second passage;
and S303, supplying water into the pipeline to be detected step by the high-pressure water supply structure at the water supply rate increased in sequence until the water pressure in the pipeline to be detected reaches a preset value.
As a preferable aspect of the present invention, the step S303 includes a first water supply rate and a second water supply rate, and the first water supply rate is smaller than the second water supply rate.
In a preferred embodiment of the present invention, when the first water supply rate is adopted, the open area of the first passage is denoted as S1And the open area of the second passage is denoted as S2；
When the second water supply rate is adopted, the open area of the first passage is recorded as S3And the open area of the second passage is denoted as S4(ii) a And the number of the first and second electrodes,
S3>S1>S4>S2。
the embodiment of the invention has the following advantages:
the embodiment of the invention can be used for effectively limiting one end of the pipeline to be tested by rotatably arranging one end of the pipeline to be tested by taking a preset point as a center, on the basis, the other end is driven to move around by taking a central line as a shaft collar through the driving structure, and high-pressure water is introduced into the other end, so that the multi-directional cyclic loading of the integral bending moment of the pipeline to be tested and the synchronous loading of the internal pressure are realized; the pure bending moment loading of the pipeline to be tested is realized by further driving of the driving structure, so that the local influence on the pipeline to be tested due to over-concentration of stress in the traditional four-point bending mode is avoided, and the error caused by the stress is reduced; by sequentially carrying out the initial conditions and the working conditions, the bending moment circulation frequency is stably improved, the test time is reduced, and the test efficiency is improved.
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 should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a fatigue testing method provided by an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an experimental apparatus used in a fatigue testing method provided by an embodiment of the present invention;
FIG. 3 is a schematic view of a partial structure of an experimental apparatus for a fatigue testing method according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a driving member of an experimental device for a fatigue testing method according to an embodiment of the present invention;
fig. 5 is a diagram illustrating a principle of a force applied to a pipe to be tested by a driving structure 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-bending moment loading structure;
11-a transfer chamber; 12-a universal ball; 13-a connecting tube; 14-a first mounting flange; 15-mounting a bracket;
21-high pressure water pipe;
41-reaction frame; 42-a rolling ball; 43-a drive member; 44-force guide rods; 45-a second mounting flange;
431-a support frame; 432-a servo motor; 433-a brake gear; 434-drive gear; 435-limit hole; 436-dowel bars.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
The fatigue test method of the present invention is further described below in conjunction with a specific experimental set-up.
As shown in FIG. 1, the invention provides a fatigue test method for applying bending moment to a pipeline cycle, which comprises the following steps:
s100, rotatably arranging one end of the pipeline 3 to be measured by taking a preset point as a center;
s200, connecting the other end of the pipeline 3 to be tested to a driving structure which can move around by taking a line parallel to connecting lines at two ends of the pipeline 3 to be tested as a central line;
s300, introducing high-pressure water into the pipeline 3 to be tested;
s400, starting the driving structure under the initial condition to enable the pipeline 3 to be tested to operate in an initial bending moment loading state;
s500, when the pipeline 3 to be tested reaches a preset stable value, adjusting the driving structure to a working condition, and circularly applying a working bending moment to the pipeline 3 to be tested.
Specifically, as shown in fig. 2, the experimental apparatus includes a pipe end fixing structure 1 (for rotatably installing one end of the pipe 3 to be tested) disposed at one end, a bending moment loading structure 4 (for connecting the other end of the pipe 3 to be tested) disposed at the other end, and a water pressure loading structure 2 (for introducing high-pressure water into the pipe 3 to be tested) communicated with the pipe end fixing structure 1, wherein a placing gap for placing the pipe 3 to be tested is formed between the pipe end fixing structure 1 and the bending moment loading structure 4. Wherein, the both ends of pipeline 3 that awaits measuring are welded respectively and are connected flange to through flange respectively with first mounting flange 14 on both ends and the pipeline tip fixed knot construct 1 and the second mounting flange 45 detachably on the moment of flexure load structure 4, during water pressure loading structure 2 carries the high pressure water in the high pressure water supply mechanism to the pipeline 3 that awaits measuring through water pipe 21 wherein, after input and accomplish, can exert circulation moment of flexure to pipeline 3 that awaits measuring through starting moment of flexure load structure 4.
Specifically, as shown in fig. 3, the pipeline end fixing structure 1 includes a transmission cavity 11, a rotatable and airtight universal ball 12 and a connection structure, wherein the transmission cavity 11 is formed inside the pipeline end fixing structure and has an opening, the universal ball 12 is arranged at the opening, the connection structure is arranged by extending the universal ball 12 outwards and is used for connecting the pipeline 3 to be measured, and the transmission cavity 11, the universal ball 12 and the connection structure are matched to form a through liquid channel. In the actual working process, the water pressure loading structure 2 inputs high-pressure water into the transfer cavity 11 through the high-pressure water pipe 21, then the high-pressure water flows to the universal ball 12, and finally the high-pressure water flows into the pipeline 3 to be measured. A cavity has in the first mounting flange 14 center for connecting pipeline 3 that awaits measuring, can let water flow into pipeline 3 that awaits measuring through first mounting flange 14 to exert pressure from inside to outside to pipeline 3 that awaits measuring. The force guide rod 44 and the force transmission rod 436 of the driving member 43 are completely fixedly connected with the rotary ball 42 of the reaction frame 41, and the rotary ball 42 is formed with a screw thread engaged with the inner surface of the reaction frame 41, so that the rotation of the rotary ball 42 in the axial direction of the ball groove of the reaction frame 41 (where both ends of the ball groove are formed as openings, and thus, where the axial direction is the axis formed from one end of the opening to the other end) is restricted, but the rotation of the rotary ball 42 in the other direction is not restricted. 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 the bending moment is achieved. Meanwhile, the arrangement mode is based on the matched rotation of the two ends, so that the adjustment of the local bending moment of conventional four-point bending is avoided, and the problems of uneven stress of the pipeline to be measured 3 and the like caused by stress concentration are avoided. This arrangement allows the force-guiding rod 44 to move around a line parallel to the line connecting the ends of the pipe to be tested, as shown in fig. 5.
As shown in fig. 4, the driving member 43 on the bending moment loading structure 4 includes a supporting frame 431 (which 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 dowel 436 eccentrically disposed on the transmission gear 434, and one end of the dowel 436, which is far away from the transmission gear 434, is connected to the rotating ball 42. Of course, here, the limit hole 435 may be eccentrically disposed on the driving gear 434, and the transmission rod 436 passes through the limit hole 435 and is not connected to the limit hole, so that it can rotate in the limit hole 435. Under 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 meanwhile, the force transmission rod 436 rotates around the axis, and further drives the rotary ball 42 to rotate in the ball groove, so that the rotating direction of the force guide rod 44 is effectively realized, and the loading of the circulating bending moment is provided for the pipeline 3 to be tested.
In the actual test, the initial condition and the working condition at least include the rotation speed of the driving structure, and the rotation speed in the initial condition is lower than that in the working condition.
In a further preferred embodiment, in order to enable the driving structure to better surround, so as to drive one end of the pipeline 3 to be tested to surround and realize loading of the bending moment, in step S200, a surrounding distance is formed between the central line and connecting lines at two ends of the pipeline 3 to be tested, the driving structure uses the end portion of the other end of the pipeline 3 to be tested, which is far away from the central line, as a surrounding center, and the surrounding end of the driving structure is connected to the other end of the pipeline 3 to be tested. That is, as shown in fig. 5, the end point located on the rightmost side is a surrounding center, the force guide rod 44 is driven by the driving member 43 to rotate around the end point located on the rightmost side as the surrounding center, and transmits force to the pipe 3 to be tested, so as to load the entire surrounding bending moment.
In a further preferred embodiment, in order to keep the internal pressure of the pipe 3 to be tested constant, the steps S400 and S500 further include pressure maintaining control of the pressure in the pipe 3 to be tested. The pressure holding control here may be realized by a pressure holding function of a pressure pump, and the hydraulic pressure loading structure 2 includes the pressure pump.
In a more preferred embodiment of the present invention, in order to better improve the stability of the whole pressurization process and avoid the problems of experiment errors and the like caused by the stress influence of sudden pressurization on the pipeline 1 to be tested in the experiment, the introducing of the high-pressure water in step S300 at least includes:
s301, sequentially communicating and arranging a buffer area and a feeding area between the high-pressure water supply structure and the pipeline 3 to be tested;
s302, respectively opening a first passage between the high-pressure water supply structure and the buffer section and a second passage between the buffer section and the access section, and enabling the opening area of the first passage to be smaller than that of the second passage;
and S303, supplying water into the pipeline 3 to be detected step by the high-pressure water supply structure at the water supply rate which is increased in sequence until the water pressure in the pipeline 3 to be detected reaches a preset value.
In a further preferred embodiment, in order to better improve the operation efficiency and ensure the experimental effect, step S303 comprises a first water supply rate and a second water supply rate, and the first water supply rate is less than the second water supply rate. Specifically, when the first water supply rate is adopted, the open area of the first passage is denoted as S1And the open area of the second passage is denoted as S2(ii) a When the second water supply rate is adopted, the open area of the first passage is recorded as S3And the open area of the second passage is denoted as S4(ii) a And, S3>S1>S4>S2。
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A fatigue test method for applying bending moment to pipeline circulation is characterized by comprising the following steps:
s100, rotatably arranging one end of the pipeline to be measured by taking a preset point as a center;
s200, connecting the other end of the pipeline to be tested to a driving structure which can perform circular motion by taking a line parallel to connecting lines at two ends of the pipeline to be tested as a central line;
s300, introducing high-pressure water into the pipeline to be detected;
s400, starting a driving structure under an initial condition to enable the pipeline to be tested to operate in an initial bending moment loading state;
s500, when the pipeline to be tested reaches a preset stable value, adjusting the driving structure to a working condition, and circularly applying a working bending moment to the pipeline to be tested.
2. A fatigue testing method according to claim 1, wherein the initial condition and the working condition comprise at least a rotation speed of the driving structure, and the rotation speed in the initial condition is smaller than the rotation speed in the working condition.
3. A fatigue testing method according to claim 1 or 2, wherein in step S200, a surrounding distance is formed between the central line and the connecting line at the two ends of the pipe to be tested, the end of the driving structure far from the other end of the pipe to be tested in the central line is used as a surrounding center, and the surrounding end of the driving structure is connected to the other end of the pipe to be tested.
4. A fatigue testing method according to claim 1 or 2, wherein the steps S400 and S500 further comprise a pressure holding control of the pressure in the pipe to be tested.
5. A fatigue test method according to claim 4, wherein the holding pressure control is a constant regulation of the internal pressure in the pipe to be tested using the holding pressure function of the pressure pump.
6. A fatigue testing method according to claim 1 or 2, wherein the introduction of high pressure water in step S300 comprises at least:
s301, sequentially communicating and arranging a buffer area and an access area between the high-pressure water supply structure and the pipeline to be tested;
s302, respectively opening a first passage between the high-pressure water supply structure and the buffer section and a second passage between the buffer section and the access section, and enabling the opening area of the first passage to be smaller than that of the second passage;
and S303, supplying water into the pipeline to be detected step by the high-pressure water supply structure at the water supply rate increased in sequence until the water pressure in the pipeline to be detected reaches a preset value.
7. A fatigue testing method according to claim 6, wherein the step S303 comprises a first water supply rate and a second water supply rate, and the first water supply rate is smaller than the second water supply rate.
8. A fatigue test method according to claim 7,characterized in that, when the first water supply rate is adopted, the open area of the first passage is recorded as S1And the open area of the second passage is denoted as S2；
When the second water supply rate is adopted, the open area of the first passage is recorded as S3And the open area of the second passage is denoted as S4(ii) a And the number of the first and second electrodes,
S3>S1>S4>S2。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111106969.3A CN113848134A (en) | 2021-09-22 | 2021-09-22 | Fatigue test method for circularly applying bending moment to pipeline |
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| CN202111106969.3A CN113848134A (en) | 2021-09-22 | 2021-09-22 | Fatigue test method for circularly applying bending moment to pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735687A (en) * | 2020-06-09 | 2020-10-02 | 东南大学 | Four-point bending device for integral stability test of loading point constraint type steel beam |
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| CN111735687B (en) * | 2020-06-09 | 2022-04-05 | 东南大学 | Four-point bending device for integral stability test of loading point constraint type steel beam |
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