CN110646297B - Fracture toughness test device for high-temperature water environment - Google Patents
Fracture toughness test device for high-temperature water environment Download PDFInfo
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- CN110646297B CN110646297B CN201911053882.7A CN201911053882A CN110646297B CN 110646297 B CN110646297 B CN 110646297B CN 201911053882 A CN201911053882 A CN 201911053882A CN 110646297 B CN110646297 B CN 110646297B
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- water tank
- chuck
- water
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- pin shaft
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 238000007656 fracture toughness test Methods 0.000 title claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims 4
- 239000000463 material Substances 0.000 abstract description 6
- 238000002474 experimental method Methods 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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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 discloses a fracture toughness test device in a high-temperature water environment, which comprises a chuck assembly, a water tank assembly and a thermocouple, wherein the chuck assembly comprises two chucks and two pin shafts; the water tank assembly comprises a water tank and a water tank cover, wherein the water tank and the water tank cover are respectively provided with an insulating layer, the water tank is provided with a water inlet and a water outlet, a resistance wire and a thermocouple are arranged in the water tank, the two chucks are connected with the water tank and the water tank cover, the inner ends of the chucks and the pin shaft are positioned in the water tank, a CT sample is fixed between the two chucks through the pin shaft, and the outer ends of the two chucks are respectively connected with the universal testing machine. According to the high-temperature water environment fracture toughness test device, the obtained high-temperature water environment fracture toughness test device can simulate the real service environment of the nuclear power pressure container, a CT sample is subjected to a high-temperature water environment experiment, the fracture toughness of a material under the service environment is measured, important experimental data are provided for evaluating the structural integrity of the nuclear power pressure container, and the device is simple and compact in structure, convenient to operate and low in cost.
Description
Technical Field
The invention belongs to the technical field of mechanical property detection devices, and particularly relates to a fracture toughness test device in a high-temperature water environment.
Background
Nuclear power is clean energy, nuclear power safety is the primary problem to be solved, structural integrity of pressure vessels such as reactor pressure vessels and steam generators is important equipment for ensuring nuclear power safety, and fracture toughness of service materials is the most critical parameter for evaluating and ensuring structural integrity of the pressure vessels. The reactor pressure vessels and steam generators such as pressurized water reactors are in service for a long time in high temperature, high pressure and water environment, the mechanical properties of materials are inevitably affected by high temperature water, but no suitable experimental equipment is available at present for testing the fracture toughness of the service materials in the high temperature water environment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a fracture toughness test device in a high-temperature water environment.
The high-temperature water environment fracture toughness test device is characterized by comprising a chuck assembly, a water tank assembly and a thermocouple, wherein the chuck assembly comprises a first chuck, a first pin shaft detachably connected with the first chuck, a second chuck and a second pin shaft detachably connected with the second chuck; the water tank assembly comprises a water tank and a water tank cover, a first heat preservation layer is arranged outside the water tank, a second heat preservation layer is arranged outside the water tank cover, a water inlet is formed in the top of the water tank, a water outlet is formed in the bottom of the water tank, a resistance wire and a thermocouple are arranged in the water tank, a first chuck is fixedly connected with the bottom of the water tank, the inner end of the first chuck and a first pin shaft are positioned in the water tank, a second chuck is in matched and sealed connection with the water tank cover, the second pin shaft and the second chuck can move up and down relative to the water tank cover under the action of external load, the inner end of the second chuck and the second pin shaft are positioned in the water tank, a CT sample is fixed between the first chuck and the second chuck through the first pin shaft and the second pin shaft, and the outer ends of the first chuck and the second chuck are respectively connected with a universal tester; the resistance wire is used for heating the water tank, water contained in the water tank and the CT sample, and the thermocouple is used for measuring the experimental temperature of the crack tip of the CT sample.
The high-temperature water environment fracture toughness testing device is characterized in that a sealing ring is arranged at the joint of the water tank cover and the second chuck, the joint is sealed, and high-temperature water is prevented from overflowing along the second chuck.
The high-temperature water environment fracture toughness test device is characterized in that a double-wall water tank is adopted as the water tank, and the resistance wire is arranged between the inner wall and the outer wall of the double tank.
The high-temperature water environment fracture toughness test device is characterized in that at least 2 thermocouples are arranged, and temperature measuring points of the thermocouples are contacted with crack tips of the CT sample, so that the test temperature of the crack tips of the CT sample can be measured accurately.
According to the high-temperature water environment fracture toughness test device, the obtained high-temperature water environment fracture toughness test device can simulate the real service environment of the nuclear power pressure container, a CT sample is subjected to a high-temperature water environment experiment, the fracture toughness of a material under the service environment is measured, important experimental data are provided for evaluating the structural integrity of the nuclear power pressure container, and the device is simple and compact in structure, convenient to operate and low in cost.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1-first chuck, 2-first heat preservation, 3-water tank, 4-resistance wire, 5-water, 6-first round pin axle, 7-CT sample, 8-thermocouple, 9-second round pin axle, 10-second chuck, 11-sealing washer, 12-water inlet, 13-water tank lid, 14-second heat preservation, 15-outlet.
Detailed Description
The invention is further described below with reference to the accompanying drawings, but the scope of the invention is not limited thereto:
As shown in fig. 1, the high-temperature water environment fracture toughness testing device comprises a chuck assembly, a water tank assembly and a thermocouple 8, wherein the chuck assembly comprises a first chuck 1, a first pin shaft 6 detachably connected with the first chuck 1, a second chuck 10 and a second pin shaft 9 detachably connected with the second chuck 10; the water tank assembly comprises a water tank 3 and a water tank cover 13, the water tank 3 adopts a double-wall water tank, a first heat insulation layer 2 is arranged outside the water tank 3, a second heat insulation layer 4 is arranged outside the water tank cover 13, a water inlet 12 is arranged at the top of the water tank 3, a water outlet 15 is arranged at the bottom of the water tank 3, a resistance wire 4 and a thermocouple 8 are arranged in the water tank 3, the resistance wire 4 is arranged between the inner wall and the outer wall of the double-tank, a first chuck 1 is fixedly welded with the bottom of the water tank 3, the inner end of the first chuck 1 and a first pin shaft 6 are positioned in the water tank 3, a second chuck 10 is matched and hermetically connected with the water tank cover 13, and in order to facilitate the adjustment of the height, the invention sets the second pin shaft 9 and the second chuck 10 to be movably connected, namely the second pin shaft 9 can move up and down relative to the water tank cover 13 under the action of external load; the inner end of the second chuck 10 and the second pin shaft 9 are positioned in the water tank 3, the upper end and the lower end of the CT sample 7 are respectively provided with mounting holes matched with the corresponding pin shafts in size, and the CT sample 7 is fixed between the first chuck 1 and the second chuck 10 through the first pin shaft 6 and the second pin shaft 9; the resistance wire 4 is used for heating the water tank 3, water 5 and CT samples 7 contained in the water tank 3, the thermocouple 8 is used for measuring the experimental temperature of the crack tips of the CT samples 7, at least 2 thermocouples 8 are arranged in order to improve the measurement accuracy, and the temperature measuring points of the thermocouples 8 are contacted with the crack tips of the CT samples 7.
As shown in the figure, the high-temperature water environment fracture toughness test device disclosed by the invention has the following specific operation process when performing a high-temperature water environment fracture toughness test:
1) The bottom of a first chuck 1 of the test device is fixedly connected with a base of a universal tester, namely, the whole test device is arranged on the universal tester, and a valve of a water outlet 15 at the bottom of a water tank 3 is closed;
2) Fixedly connecting the second chuck 10 with the top chuck of the universal testing machine at the other end, sleeving the water tank cover 13 on the second chuck 10, and moving to the uppermost end of the second chuck 10 to be temporarily fixed;
3) The vertical position of the second chuck 10 is finely adjusted through a universal testing machine, so that the mounting hole of the CT sample 7 corresponds to the position of the second pin shaft 9, then the CT sample 7 is matched and installed into the first chuck 1, the CT sample 7 is detachably connected with the first chuck 1 through the first pin shaft 6, and then the CT sample 7 is matched and connected with the second chuck 10 through the second pin shaft 9;
4) Installing a thermocouple 8, and enabling a temperature measuring point of the thermocouple 8 to be in contact with the crack tip of the CT sample 7;
5) The water tank cover 13 is put down, so that the water tank cover 13 is tightly connected with the water tank 3;
6) A certain amount of water is injected into the water tank 3 through a water inlet 12 arranged on the water tank cover 13, and the water level at least submerges the upper surface of the sample and exceeds the upper surface by 20-30 mm, so that the CT sample 7, the first clamping head 1, the second clamping head 10, the first pin shaft 6 and the second pin shaft 9 for installing the CT sample 7 are completely immersed in the water;
7) Closing the water inlet 12, electrifying the resistance wire 7, heating the water tank 3 and the water and the CT sample 7 in the water tank by the resistance wire 7, measuring the temperature of the water and the CT sample 7 by the thermocouple 8, and carrying out the next operation after the measured temperature reaches the test temperature for at least 30 minutes, so as to uniformly heat the CT sample 7;
8) And (3) performing experimental tests according to standard steps of fracture toughness tests, draining water, cooling, opening the water tank cover 13, and taking down the pin shaft and the CT sample 7 after the experimental tests are finished.
The device can simulate the real service environment of the nuclear power pressure vessel, carry out high-temperature water environment experiments on CT samples, provide matched high-temperature water environment for measuring the fracture toughness of materials in the service environment, and provide important experimental data for evaluating the structural integrity of the nuclear power pressure vessel.
Claims (4)
1. The test method based on the high-temperature water environment fracture toughness test device comprises a chuck assembly, a water tank assembly and a thermocouple (8), wherein the chuck assembly comprises a first chuck (1), a first pin shaft (6) detachably connected with the first chuck (1), a second chuck (10) and a second pin shaft (9) detachably connected with the second chuck (10); the water tank assembly comprises a water tank (3) and a water tank cover (13), a first heat-insulating layer (2) is arranged outside the water tank (3), a second heat-insulating layer (2) is arranged outside the water tank cover (13), a water inlet (12) is formed in the top of the water tank (3), a water outlet (15) is formed in the bottom of the water tank (3), a resistance wire (4) and a thermocouple (8) are arranged in the water tank (3), a first chuck (1) is fixedly connected with the bottom of the water tank (3), the inner end of the first chuck (1) and a first pin shaft (6) are located inside the water tank (3), a second chuck (10) is in matched sealing connection with the water tank cover (13), the second pin shaft (9) and the second chuck (10) can move up and down relative to the water tank cover (13) under the action of external load, the inner end of the second chuck (10) and the second pin shaft (9) are located inside the water tank (3), and a CT sample (7) is fixed between the first chuck (1) and the second chuck (10) through the first pin shaft (6) and the second pin shaft (9); the resistance wire (4) is used for heating the water tank (3), water (5) contained in the water tank (3) and the CT sample (7), and the thermocouple (8) is used for measuring the experimental temperature of the crack tip of the CT sample (7); the method is characterized by comprising the following specific operation processes:
1) The bottom of a first chuck (1) of the test device is fixedly connected with a base of a universal testing machine, namely, the whole test device is arranged on the universal testing machine, and a valve of a water outlet (15) at the bottom of a water tank (3) is closed;
2) Fixedly connecting the second chuck (10) with the top chuck of the universal testing machine at the other end, sleeving the water tank cover (13) on the second chuck (10) and moving to the uppermost end of the second chuck (10) to be temporarily fixed;
3) The vertical position of the second chuck (10) is finely adjusted through a universal testing machine, so that the mounting hole of the CT sample (7) corresponds to the position of the second pin shaft (9), then the CT sample (7) is matched and loaded into the first chuck (1), the CT sample (7) is detachably connected with the first chuck (1) through the first pin shaft (6), and then the CT sample (7) is matched and connected with the second chuck (10) through the second pin shaft (9);
4) Installing a thermocouple (8), and enabling a temperature measuring point of the thermocouple (8) to be in contact with the crack tip of the CT sample (7);
5) The water tank cover (13) is put down, so that the water tank cover (13) is tightly connected with the water tank (3);
6) A certain amount of water is injected into the water tank (3) through a water inlet (12) arranged on the water tank cover (13), and the water level at least submerges the upper surface of the sample and exceeds the upper surface by 20-30 mm, so that the CT sample (7) and the first clamping head (1), the second clamping head (10), the first pin shaft (6) and the second pin shaft (9) for installing the CT sample (7) are completely submerged in the water;
7) Closing the water inlet (12), electrifying the resistance wire (4), heating the water tank (3) and the water and CT sample (7) in the water tank by the resistance wire (4), measuring the temperature of the water and the CT sample (7) by the thermocouple (8), and carrying out the next operation after the measured temperature reaches the test temperature for at least 30 minutes, so as to uniformly heat the CT sample (7);
8) And (3) performing experimental tests according to standard steps of fracture toughness tests, draining water, cooling, opening a water tank cover (13), and taking down the pin shaft and the CT sample (7) after the experimental tests are finished.
2. The test method based on the high-temperature water environment fracture toughness test device according to claim 1, wherein a sealing ring (11) is arranged at the joint of the water tank cover (13) and the second clamping head (10), and the joint is sealed to prevent high-temperature water from overflowing along the second clamping head (10).
3. The test method based on the high-temperature water environment fracture toughness test device according to claim 1, wherein the water tank (3) is a double-wall water tank, and the resistance wire (4) is arranged between the inner wall and the outer wall of the double tank.
4. The test method based on the high-temperature water environment fracture toughness test device according to claim 1, wherein at least 2 thermocouples (8) are arranged, and temperature measuring points of the thermocouples (8) are in contact with crack tips of the CT sample (7), so that the test temperature of the crack tips of the CT sample (7) can be accurately measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911053882.7A CN110646297B (en) | 2019-10-31 | 2019-10-31 | Fracture toughness test device for high-temperature water environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911053882.7A CN110646297B (en) | 2019-10-31 | 2019-10-31 | Fracture toughness test device for high-temperature water environment |
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| CN110646297A CN110646297A (en) | 2020-01-03 |
| CN110646297B true CN110646297B (en) | 2024-06-11 |
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| CN112964573B (en) * | 2021-02-08 | 2022-05-03 | 四川大学 | Cylindrical surface direct shear rheological testing machine for cylindrical rock core in deep-ground environment |
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