CN112798430A - Clamp for U-shaped pipeline high-temperature high-pressure water environment test - Google Patents
Clamp for U-shaped pipeline high-temperature high-pressure water environment test Download PDFInfo
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- CN112798430A CN112798430A CN202110176795.1A CN202110176795A CN112798430A CN 112798430 A CN112798430 A CN 112798430A CN 202110176795 A CN202110176795 A CN 202110176795A CN 112798430 A CN112798430 A CN 112798430A
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- shaped pipeline
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 150000003839 salts Chemical class 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 150000007522 mineralic acids Chemical class 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 150000007524 organic acids Chemical class 0.000 description 2
- 235000005985 organic acids Nutrition 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910021652 non-ferrous alloy Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 230000003068 static effect Effects 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- 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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- 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 invention aims to disclose a clamp for a U-shaped pipeline high-temperature and high-pressure water environment test, which comprises four supporting, upper load bearing platforms, lower load bearing platforms, fixed corner blocks and sample clamping blocks, wherein the four supporting, upper load bearing platforms are arranged on the four supporting, lower load bearing platforms are arranged on the four supporting, upper load bearing platforms; compared with the prior art, all parts are symmetrically designed and symmetrically distributed by taking the loading rod of the testing machine as a center, so that the load applied to the sample is stable and strictly centered in the testing process, the stability of the whole fixture is ensured, the long-time running of the test is facilitated, the sample clamping block can rotate up and down along with the sample, the local stress concentration is avoided, and the device is suitable for the mechanical test of the pipeline sample with the U-shaped bending structure in a high-temperature high-pressure water environment, and the aim of the invention is realized.
Description
Technical Field
The invention relates to a clamp for a high-temperature and high-pressure water environment test, in particular to a clamp for a U-shaped pipeline high-temperature and high-pressure water environment test.
Background
With the continuous increase of energy demand in China, nuclear power has entered a new stage of batch development and technology updating in China. In the full-life-cycle operation and maintenance of a large advanced pressurized water reactor nuclear power station, the consistency among the design requirements, the physical technical state and the technical file state is kept aiming at the operation condition of key equipment, which is an important target of the operation and maintenance of a nuclear power plant and is also an important inspection content of the periodic safety review and the continuation of the license of the power plant, thereby realizing the closed-loop management of the design requirements.
Accelerated aqueous fatigue of a pressurized water reactor is fatigue under the action of a corrosive medium environment, and is the result of the combined action of a medium-induced corrosion failure process and a cyclic stress-induced fatigue failure process. In corrosive media, even if only static loads act and the stress intensity factor at the crack tip is well below the critical fracture toughness value, crack propagation may occur after a certain time, which is the result of the mutual promotion of electrochemical corrosion and mechanical failure by stress. In engineering technology, corrosion fatigue is one of the most important reasons for sudden damage of a metal component in safety design, and metal materials generating corrosion fatigue generally comprise carbon steel, low alloy steel, austenitic stainless steel, nickel-based alloy and other nonferrous alloys, such as metal materials used for nuclear power equipment, marine structures, petrochemical equipment, aircraft structures and the like, and fatigue damage is often caused under the combined action of cyclic load and corrosion environment, so that catastrophic accidents are often caused.
At present, a great deal of experimental research is carried out at home and abroad aiming at the performance of various materials under the air environment and the corrosive medium environment, but the research is only aiming at the performance of the materials. In actual use, the material has various structures. Under the operating condition, the factors influencing the service life of the equipment are only the material performance and the environment, and the structural form of the material also plays an important role. However, performance studies on the belt structure materials have been less frequent for a while, one important reason being the high requirements of the test equipment and fixtures for the belt structure test specimens.
Therefore, a clamp for a U-shaped pipeline high-temperature and high-pressure water environment test is particularly needed to solve the existing problems.
Disclosure of Invention
The invention aims to provide a clamp for a U-shaped pipeline high-temperature and high-pressure water environment test, which effectively solves the loading problem of a mechanical test under a high-temperature and high-pressure water environment of a pipeline sample with a U-shaped bent structure aiming at the defects of the prior art.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
the fixture for the U-shaped pipeline high-temperature and high-pressure water environment test is characterized by comprising four supports, an upper load platform, a lower load platform, fixed corner blocks and sample clamping blocks, wherein the lower parts of the supports are fixed on the testing machine and symmetrically arranged around a loading rod of the testing machine, the upper load platform is fixed on the upper parts of the supports, the lower load platform is fixed on the loading rod of the testing machine and provides power, the upper load platform and the lower load platform are respectively fixed with the two fixed corner blocks, the sample clamping blocks are arranged between the fixed corner blocks, and the sample clamping blocks of the upper load platform and the sample clamping blocks of the lower load platform are respectively connected with parallel sections at two ends of a U-shaped pipeline sample.
In one embodiment of the invention, the upper end of the support and the upper load platform are mutually connected and fixed through 1 gasket and 2 nuts, and the lower part of the support and the testing machine, the upper load platform and the fixed corner block and the lower load platform and the fixed corner block are mutually connected and fixed through long bolts.
In one embodiment of the invention, a bearing is disposed within the fixed corner block.
In one embodiment of the invention, the lower load platform and the loading rod of the testing machine are fixedly connected with each other by threads, and the lower part of the lower load platform is provided with a fastening nut.
Compared with the prior art, all parts of the clamp for the U-shaped pipeline high-temperature high-pressure water environment test are symmetrically designed, and are symmetrically distributed by taking the loading rod of the testing machine as a center, so that the load exerted on a sample in the test process is stable and strictly centered, the stability of the whole clamp is ensured, the long-time running of the test is facilitated, the sample clamping block can rotate up and down along with the sample, the local stress concentration is avoided, the clamp is suitable for the mechanical test of the pipeline sample with the U-shaped bending structure in the high-temperature high-pressure water environment, and the purpose of the clamp is realized.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a schematic structural diagram of a clamp for a U-shaped pipeline high-temperature high-pressure water environment test according to the invention;
FIG. 2 is a schematic structural diagram of an upper load platform of the present invention;
FIG. 3 is a schematic structural diagram of a download load platform according to the present invention;
FIG. 4 is a schematic structural view of the fixed corner block of the present invention;
fig. 5 is a schematic view of the structure of the sample block of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Examples
As shown in fig. 1 to 5, the fixture for U-shaped pipeline high-temperature and high-pressure water environment test of the present invention comprises four supports 10, an upper load platform 20, a lower load platform 30, fixed corner blocks 40 and sample clamping blocks 50, wherein the lower part of the support 10 is fixed on the testing machine and symmetrically arranged around the loading rod of the testing machine, the upper load platform 20 is fixed on the upper part of the support 10, the lower load platform 30 is fixed on the loading rod of the testing machine and provides power, the upper load platform 20 and the lower load platform 30 are respectively fixed with two fixed corner blocks 40, the sample clamping blocks 50 are arranged between the fixed corner blocks 40, and the sample clamping blocks of the upper load platform 20 and the sample clamping blocks of the lower load platform 30 are respectively connected with the parallel sections at two ends of the U-shaped pipeline sample.
During the test, the fixed angle blocks and the sample clamping blocks on the support 10, the upper load platform 20 and the upper load platform 20 are stable and immobile, and the fixed angle blocks and the lower sample clamping blocks on the lower load platform 30 and the lower load platform 30 apply loads to the sample along with the loading rod of the testing machine.
The clamp for the U-shaped pipeline high-temperature and high-pressure water environment test adopts 0Cr17Ni12Mo2 stainless steel with excellent high-temperature performance, can still maintain sufficient strength and toughness at high temperature, and has excellent thermal expansion and cold contraction resistance. The test data of the test sample can not be invalid due to the thermal expansion and cold contraction deformation of the clamp under the environment of 360 ℃. Because the carbon content is low and the molybdenum content is 2-3%, the corrosion resistance to reducing salt, various inorganic acids, organic acids, alkali and salts is improved, and the alloy can be used in corrosive media.
In this embodiment, all components are symmetrically designed and symmetrically distributed about the tester load bar, which ensures that the load applied to the test specimen is stable and well centered during the test. For fatigue tests, in particular environmental corrosion fatigue tests, often one test is carried out continuously for thousands of hours, which puts very high demands on the stability of the test fixture.
The upper end of the support 10 and the upper load platform 20 are connected and fixed with each other through 1 gasket and 2 nuts, and the lower part of the support 10 is connected with the testing machine, the upper load platform 20 is connected with the fixed angle block 40, and the lower load platform 30 is connected and fixed with the fixed angle block 40 through long bolts.
In this example, the sample to be used is a U-bend tube-like sample, which is an asymmetric sample. When the parallel section at the lower end of the sample is subjected to tension and compression loads, the originally parallel straight pipe sections have certain angles. If the clamp is not self-adjusting with sample changes, a large stress concentration may be created where the sample contacts the clamp, possibly causing the sample to break earlier than the pipe bend at the point where the sample contacts the clamp, causing the test to fail. In order to avoid this, a bearing is provided in the fixed angle block 40, and when the straight pipe section of the sample needs to be angled, the sample clamping block 50 can rotate up and down along with the sample, so as to avoid local stress concentration.
In this embodiment, the lower load platform 30 and the loading rod of the testing machine are fixed to each other by screw threads, and a fastening nut is disposed at the lower portion of the lower load platform 30.
The clamp for the U-shaped pipeline high-temperature and high-pressure water environment test has the following advantages:
(1) the device is suitable for a mechanical test of a pipeline sample with a U-shaped bent structure in a high-temperature and high-pressure water environment.
(2) The alloy is made of 0Cr17Ni12Mo2 stainless steel, can still maintain sufficient strength and toughness at high temperature, and has excellent thermal expansion and cold contraction resistance.
(3) The 0Cr17Ni12Mo2 stainless steel has low carbon content and contains 2-3% of molybdenum, so that the stainless steel has improved corrosion resistance to reducing salts, various inorganic acids, organic acids, alkalis and salts, and can be used in corrosive media.
(4) All parts are symmetrically designed and symmetrically distributed by taking the loading rod of the testing machine as a center, so that the load applied to the test sample is stable and strictly centered in the testing process.
(5) Every supports all used 1 gasket and 2 nuts with being connected of upper portion load platform, supports all to adopt long bolt with being connected of testing machine, load platform and fixed horn block, has guaranteed the steadiness of a whole set of anchor clamps, is favorable to experimental long-time operation.
(6) The bearing is installed in each fixed corner block, and when the straight pipe section of the sample needs to form a certain angle, the sample clamping block can rotate up and down along with the sample, so that local stress concentration is avoided.
(7) The lower load platform is in threaded connection with the loading rod of the testing machine, and the fastening nut is arranged on the lower portion of the load platform, so that the stability of the clamp during long-time operation is guaranteed.
(8) Because the clamp is compact, in order to increase the installation space and avoid the scratch of fingers of a tester, the corner positions of the clamp are subjected to corner cutting treatment.
(9) The structure, the material and the like of each part of the clamp are specified, and the structure size can be adjusted according to the size of the testing machine and the size of the U-shaped sample.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (4)
1. The fixture for the U-shaped pipeline high-temperature and high-pressure water environment test is characterized by comprising four supports, an upper load platform, a lower load platform, fixed corner blocks and sample clamping blocks, wherein the lower parts of the supports are fixed on the testing machine and symmetrically arranged around a loading rod of the testing machine, the upper load platform is fixed on the upper parts of the supports, the lower load platform is fixed on the loading rod of the testing machine and provides power, the upper load platform and the lower load platform are respectively fixed with the two fixed corner blocks, the sample clamping blocks are arranged between the fixed corner blocks, and the sample clamping blocks of the upper load platform and the sample clamping blocks of the lower load platform are respectively connected with parallel sections at two ends of a U-shaped pipeline sample.
2. The fixture for the U-shaped pipeline high-temperature and high-pressure aquatic environment test as claimed in claim 1, wherein the upper end of the support and the upper load platform are fixedly connected with each other through 1 gasket and 2 nuts, and the lower portion of the support and the tester, the upper load platform and the fixed corner block, and the lower load platform and the fixed corner block are fixedly connected with each other through long bolts.
3. The clamp for the U-shaped pipeline high-temperature and high-pressure aquatic environment test as claimed in claim 1, wherein a bearing is arranged in the fixed corner block.
4. The fixture for the U-shaped pipeline high-temperature and high-pressure aquatic environment test as claimed in claim 1, wherein the lower load platform and the loading rod of the testing machine are fixedly connected with each other by threads, and a fastening nut is arranged at the lower part of the lower load platform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176795.1A CN112798430A (en) | 2021-02-09 | 2021-02-09 | Clamp for U-shaped pipeline high-temperature high-pressure water environment test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176795.1A CN112798430A (en) | 2021-02-09 | 2021-02-09 | Clamp for U-shaped pipeline high-temperature high-pressure water environment test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112798430A true CN112798430A (en) | 2021-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110176795.1A Pending CN112798430A (en) | 2021-02-09 | 2021-02-09 | Clamp for U-shaped pipeline high-temperature high-pressure water environment test |
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| CN (1) | CN112798430A (en) |
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| CN110715862A (en) * | 2019-11-13 | 2020-01-21 | 吉林大学 | Instrument and method for testing mechanical properties of material under tension-torsion composite-force-heat coupling working condition |
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| CN211553588U (en) * | 2020-01-17 | 2020-09-22 | 中南大学 | Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample |
| CN211940535U (en) * | 2019-11-06 | 2020-11-17 | 四川川锅锅炉有限责任公司 | U-shaped pipe water pumping tool of high-pressure heater |
| CN214894551U (en) * | 2021-02-09 | 2021-11-26 | 上海核工程研究设计院有限公司 | Clamp for U-shaped pipeline high-temperature high-pressure water environment test |
-
2021
- 2021-02-09 CN CN202110176795.1A patent/CN112798430A/en active Pending
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| JPH09281023A (en) * | 1996-04-16 | 1997-10-31 | Nippon Steel Corp | U-shape bending fatigue tester |
| CN101963560A (en) * | 2009-07-24 | 2011-02-02 | 延锋伟世通汽车饰件系统有限公司 | Material high-speed tensile test sample band and testing method thereof |
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| CN110715862A (en) * | 2019-11-13 | 2020-01-21 | 吉林大学 | Instrument and method for testing mechanical properties of material under tension-torsion composite-force-heat coupling working condition |
| CN211553588U (en) * | 2020-01-17 | 2020-09-22 | 中南大学 | Universal clamp for compressive creep aging and stress relaxation aging experiments of round bar-shaped test sample |
| CN111426560A (en) * | 2020-03-09 | 2020-07-17 | 神宇通信科技股份公司 | Ultra-fine electronic wire |
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