CN112525515B - Strip spring fatigue test device - Google Patents
Strip spring fatigue test device Download PDFInfo
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- CN112525515B CN112525515B CN202011484415.2A CN202011484415A CN112525515B CN 112525515 B CN112525515 B CN 112525515B CN 202011484415 A CN202011484415 A CN 202011484415A CN 112525515 B CN112525515 B CN 112525515B
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- Prior art keywords
- strip spring
- spring
- strip
- test
- tested
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims description 35
- 239000000446 fuel Substances 0.000 claims description 4
- 238000004088 simulation Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000004484 Briquette Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- 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
-
- 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
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- Physics & Mathematics (AREA)
- General 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)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
本公开属于核电技术领域，具体涉及一种条带弹簧疲劳试验装置。本公开通过通过垫块和测试棒共同压抵条带弹簧的钢凸和弹片，对弹簧与底板接触处进行压点约束，并通过多个压块压抵条带弹簧上每个弹片一侧的位置，即能够有效固定条带弹簧，又能够模拟条带弹簧之间相互搭接情况下的受力情况，从而逼真的模拟了条带弹簧真实工况约束条件，解决了无法对条带弹簧整体疲劳性能进行测试研究的难题。可以实现对弹簧真实工况的模拟并进行测试，为研究条带弹簧疲劳性能提供了重要的理论指导和技术支撑，具有重要的科学意义和工程应用价值。
The present disclosure belongs to the field of nuclear power technology, and specifically relates to a strip spring fatigue test device. The present disclosure uses a pad and a test rod to press against the steel convexity and spring sheet of the strip spring, constrains the contact point between the spring and the base plate, and uses multiple pressure blocks to press against the position of one side of each spring sheet on the strip spring, which can effectively fix the strip spring and simulate the stress conditions when the strip springs overlap each other, thereby realistically simulating the real working condition constraints of the strip spring and solving the problem of being unable to test and study the overall fatigue performance of the strip spring. It can achieve simulation and testing of the real working condition of the spring, provide important theoretical guidance and technical support for studying the fatigue performance of the strip spring, and has important scientific significance and engineering application value.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a strip spring fatigue test device.
Background
The strip spring is widely applied to the production of nuclear fuel elements and plays a key supporting role, so that the fatigue performance of the strip spring is directly related to the service life and reliability of equipment. However, because the strip spring has a special size and the stress condition in the service process is very complex, the test and research on the fatigue performance of the strip spring are all carried out based on a single spring or the actual working condition is simplified. Along with the improvement of the requirements on the quality and service life of equipment, the traditional testing method and means cannot meet the requirements of engineering application, so that proper equipment is urgently required to test the fatigue performance of the whole strip spring according to the actual service working condition.
Disclosure of Invention
In order to overcome the problems in the related art, a strip spring fatigue test device is provided.
According to an aspect of the embodiment of the disclosure, a strip spring fatigue test device is provided, which comprises a bottom plate, a pressing plate, a test rod, a plurality of pressing blocks and a plurality of cushion blocks;
The upper surface of the bottom plate is provided with a plurality of grooves, each groove is internally embedded with a cushion block, and the arc-shaped upper surface of each cushion block faces to the opening of the embedded groove;
The strip spring to be tested covers the plurality of strip grooves, and the upper surface of each cushion block is contacted with one steel boss;
The pressing plate is connected above the bottom plate, the lower surface of the pressing plate is provided with a plurality of grooves, each groove is embedded into one pressing block, the lower surface of each pressing block is pressed against one side of an elastic sheet on the upper surface of the strip spring to be tested, and each elastic sheet is positioned between two pressing blocks;
The upper end of the test rod is connected with the fatigue testing machine, the pressing plate is of a square frame structure, the lower end of the test rod can penetrate through the inner frame of the pressing plate to be pressed against the elastic sheet of each strip spring to be tested, and the fatigue testing machine is used for applying a plurality of preset threshold pressures to the test rod to test the fatigue pressure value of the strip spring to be tested.
In one possible implementation manner, the plurality of cushion blocks are divided into a plurality of groups, the heights of the cushion blocks in each group are the same, the number of the cushion blocks in each group is the same as the number of the grooves, and the heights of the cushion blocks in different groups are different.
In one possible implementation, the lower surface of each briquette is planar, and the width of the lower surface of each briquette is less than the width of the upper surface of the briquette.
In one possible implementation, the lower end of the test bar includes a plurality of pressure heads, each capable of pressing against one of the elastic sheets of the strip spring to be tested.
In one possible implementation, the pressure plate is connected to the base plate by a plurality of screws.
In one possible implementation, the platen and the base plate are aligned by a plurality of locating pins extending axially through the platen and the base plate.
In one possible implementation manner, a plurality of positioning grooves are formed in the edge of the strip spring to be tested, and a plurality of positioning threaded holes are formed in the bottom plate and the pressing plate along the axial direction;
the strip spring fatigue test device further comprises a plurality of positioning screws, wherein each positioning screw is in threaded connection with one positioning threaded hole of the bottom plate and one positioning threaded hole of the pressing plate and is clamped in one positioning groove.
In one possible implementation, the curvature of the upper surface of the spacer corresponds to the curvature of the side of the fuel rod.
In one possible implementation, the strip spring fatigue test device further comprises a plurality of baffles, each baffle being connected to one side of the bottom plate.
In one possible implementation, each baffle is connected to the base plate by a screw.
The test device has the beneficial effects that the cushion block and the test rod are pressed against the steel bulge and the elastic sheet of the strip spring together to restrain the pressing point of the contact part of the spring and the bottom plate, and the plurality of pressing blocks are pressed against the position of one side of each elastic sheet on the strip spring, so that the strip spring can be effectively fixed, and the stress condition of the strip spring under the condition of mutual lap joint can be simulated, thereby realistically simulating the constraint condition of the real working condition of the strip spring, and solving the problem that the test study on the integral fatigue performance of the strip spring can not be carried out. The simulation of the actual working condition of the spring can be realized and the test can be performed, so that important theoretical guidance and technical support are provided for researching the fatigue performance of the strip spring, and the method has important scientific significance and engineering application value.
Drawings
FIG. 1 is a schematic diagram of a strip spring fatigue test apparatus, according to an exemplary embodiment.
FIG. 2 is a top view of a strip spring fatigue test apparatus according to an example embodiment.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
In the present disclosure, one surface of the strip spring may be a steel protrusion, and a position opposite to the other surface of the strip spring with the steel protrusion may be a spring plate, where the steel protrusion and the spring plate of the strip spring are simultaneously extruded by different fuel rods in an actual service process of the strip spring.
FIG. 1 is a schematic diagram of a strip spring fatigue test apparatus, according to an exemplary embodiment. As shown in FIG. 1, the strip spring fatigue test device comprises a bottom plate 2, a pressing plate 6, a test rod 4, a plurality of pressing blocks 3 and a plurality of cushion blocks 5;
As shown in fig. 1, the bottom plate can be fixedly connected to the movable workbench fixing frame 1, the upper surface of the bottom plate 2 is provided with a plurality of grooves, a cushion block 5 is embedded in each groove, and the arc-shaped upper surface of each cushion block 5 faces to the opening of the embedded groove;
the strip spring 10 to be tested is covered above the plurality of strip grooves, and the upper surface of each cushion block 5 is contacted with one steel boss 101;
the platen 6 is attached above the base plate 2, and fig. 2 is a top view of a strip spring fatigue test apparatus according to an exemplary embodiment. As shown in fig. 2, the platen 6 is connected to a base plate (not shown in fig. 2) by a plurality of screws 8, and alignment between the platen 6 and the base plate 2 can be performed by a plurality of positioning pins 7 extending axially through the platen 6 and the base plate 2.
As shown in fig. 1, the lower surface of the pressing plate 6 is provided with a plurality of grooves, each groove is embedded into one pressing block 3, the lower surface of each pressing block 3 is pressed against one side of the elastic sheet 100 on the upper surface of the strip spring 10 to be tested, and each elastic sheet 100 is positioned between two pressing blocks 3;
In one possible implementation, as shown in fig. 1, the lower surface of each briquette 3 is planar, and the width of the lower surface of each briquette 3 is smaller than the width of the upper surface of the briquette 3. The mutually overlapped stress state of the strip springs 10 to be tested can be simulated more realistically.
The upper end of the test rod 4 is connected with a fatigue testing machine, the pressing plate 6 is of a square frame structure, the lower end of the test rod 4 can penetrate through the inner frame of the pressing plate 6 to be pressed against the elastic sheet 100 of each strip spring 10 to be tested, and the fatigue testing machine is used for applying a plurality of preset threshold pressures to the test rod 4 to test the fatigue pressure value of the strip spring 10 to be tested.
The contact surface of the grid spring and the fuel rod is ensured to be subjected to positive pressure in the whole test process during the fatigue test, the grid spring is compressed to nominal displacement during the test, then a certain compression amount is applied, the grid spring is loaded back and forth according to the cyclic load at the position, the cycle times of the grid spring when the grid spring is completely broken are recorded, and if the grid spring is not broken after 1X 107 load cycles are completed, the test can be stopped.
According to the test strip spring testing device, the cushion block and the test rod are pressed against the steel bulge and the elastic sheet of the strip spring to be tested together, the contact position of the spring and the bottom plate is subjected to pressure point constraint, and the plurality of pressing blocks are pressed against the position of one side of each elastic sheet on the strip spring to be tested, so that the strip spring to be tested can be effectively fixed, the stress condition of the strip spring to be tested under the condition of mutual lap joint can be simulated, the real working condition constraint condition of the strip spring to be tested is simulated realistically, and the problem that the whole fatigue performance of the strip spring to be tested cannot be tested and studied is solved. The simulation of the actual working condition of the spring can be realized and the test can be performed, so that important theoretical guidance and technical support are provided for researching the fatigue performance of the strip spring to be tested, and the method has important scientific significance and engineering application value.
In one possible implementation, the plurality of pads are divided into a plurality of groups, each group of pads has the same height, the number of pads in each group is the same as the number of the plurality of grooves, and the heights of the pads in different groups are different.
In one possible implementation, the lower end of the test stick includes a plurality of pressure heads, each capable of pressing against one of the resilient plates of the strip spring under test. Therefore, a plurality of shrapnel can be tested simultaneously, and the testing efficiency is improved.
In one possible implementation mode, the strip spring fatigue test device further comprises a plurality of positioning screws, wherein the edges of the strip spring to be tested are provided with a plurality of positioning grooves, the bottom plate and the pressing plate are provided with a plurality of positioning threaded holes along the axial direction, and each positioning screw is in threaded connection with one positioning threaded hole of the bottom plate and one positioning threaded hole of the pressing plate and is clamped in one positioning groove. This further secures the strip spring to be tested.
In one possible implementation, the plurality of pads are divided into a plurality of groups, each group of pads has the same height, the number of pads in each group is the same as the number of the plurality of grooves, and the heights of the pads in different groups are different. In this way, different pre-deformation amounts during actual spring loading can be simulated by inserting cushion blocks with different heights.
As shown in fig. 2, the strip spring fatigue test apparatus further includes a plurality of shutters 9, each shutter 9 being attached to one side of a bottom plate (not shown) under the pressing plate 6. Thus, the strip spring to be tested can be further effectively fixed. Wherein each baffle is connected with the bottom plate through a screw.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement of the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011484415.2A CN112525515B (en) | 2020-12-16 | 2020-12-16 | Strip spring fatigue test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011484415.2A CN112525515B (en) | 2020-12-16 | 2020-12-16 | Strip spring fatigue test device |
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| Publication Number | Publication Date |
|---|---|
| CN112525515A CN112525515A (en) | 2021-03-19 |
| CN112525515B true CN112525515B (en) | 2025-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011484415.2A Active CN112525515B (en) | 2020-12-16 | 2020-12-16 | Strip spring fatigue test device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235021A (en) * | 2021-12-28 | 2022-03-25 | 中核建中核燃料元件有限公司 | Clamping device for strips |
| WO2024197696A1 (en) * | 2023-03-30 | 2024-10-03 | 苏州热工研究院有限公司 | Stress corrosion test device and stress corrosion test method for grid spring |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215811562U (en) * | 2020-12-16 | 2022-02-11 | 中核建中核燃料元件有限公司 | Strip spring fatigue test device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1480965A (en) * | 1965-05-25 | 1967-08-09 | ||
| CA941524A (en) * | 1971-03-18 | 1974-02-05 | Karl H. Puechl | Spacer grid for nuclear reactor fuel assembly |
| FR2712389B1 (en) * | 1993-11-12 | 1996-01-26 | Fbfc | Device for measuring the force exerted by a grid spring. |
| KR100432581B1 (en) * | 2001-07-10 | 2004-05-24 | 한국수력원자력 주식회사 | Spacer Grid for Uniform Conformal Contact with Fuel Rod and for Extending the Elastic Range of the Grid Spring |
| US20110200160A1 (en) * | 2010-02-16 | 2011-08-18 | Westinghouse Electric Company | Split spring anti-fretting fuel rod support structure |
| KR102065770B1 (en) * | 2018-05-08 | 2020-01-13 | 한전원자력연료 주식회사 | A WH type skeleton bulge tool fatigue test device |
| CN111829874A (en) * | 2020-07-24 | 2020-10-27 | 中国核动力研究设计院 | Clamp and test method for zirconium tube fatigue test |
| CN111933318B (en) * | 2020-07-31 | 2022-10-25 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Simulation elastic rod test device and method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN215811562U (en) * | 2020-12-16 | 2022-02-11 | 中核建中核燃料元件有限公司 | Strip spring fatigue test device |
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| CN112525515A (en) | 2021-03-19 |
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