CN217212005U - Device for testing low-temperature fracture toughness of material through liquid medium cooling - Google Patents
Device for testing low-temperature fracture toughness of material through liquid medium cooling Download PDFInfo
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- CN217212005U CN217212005U CN202220180487.6U CN202220180487U CN217212005U CN 217212005 U CN217212005 U CN 217212005U CN 202220180487 U CN202220180487 U CN 202220180487U CN 217212005 U CN217212005 U CN 217212005U
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Abstract
The utility model relates to a device for testing low-temperature fracture toughness of material through liquid medium cooling belongs to the technical field of fracture toughness test. The device comprises a low-temperature water tank, wherein a through round hole is formed in the bottom of the low-temperature water tank, a water tank cylinder is arranged in the round hole, and the water tank cylinder and the low-temperature water tank are integrally arranged; the upper part of the water tank cylinder is connected with an upper supporting mechanism, and the lower part of the water tank cylinder is connected with a lower supporting mechanism; a sample to be measured is arranged on the upper supporting mechanism, and a transverse extensometer is arranged at the position of the notch of the sample to be measured; a pressing mechanism is arranged above the sample to be detected; two lower pressure heads with symmetrical positions are arranged at the bottom of the lower pressure mechanism downwards along the vertical direction. The utility model discloses can test the fracture toughness value of metal appearance piece under the utmost point low temperature that conventional low temperature device can not reach.
Description
Technical Field
The utility model relates to a test device of material low temperature fracture toughness through liquid medium cooling belongs to the technical field of fracture toughness test.
Background
The fracture toughness is a quantitative index for representing the capability of the material for preventing the instability and the propagation of the crack and measuring the toughness of the material, and plays an extremely important role in many fields such as ocean engineering, aerospace and the like. The test measurement of fracture toughness has great effect on the integrity evaluation, damage tolerance design, applicability evaluation and residual strength analysis of different engineering components. In addition, the fracture toughness value of the material can also be used as the basis of material performance evaluation and quality assurance of a typical engineering structure, and is widely applied to important industrial fields of nuclear power, petroleum pipelines, pressure vessels, ocean engineering, ships, aerospace and the like.
At present, the fracture toughness of the material at room temperature or lower temperature (room temperature to about minus 80 ℃) is tested and researched more widely, the testing method and means are mature, the temperature reduction in the temperature range can be realized only by using a low-temperature box or a gas nitrogen cooling mode, and a transverse extensometer for measuring the crack expansion amount can also meet the requirement of being reduced to the temperature range and can also be accurately used for measuring.
However, with the development of the fields of hydrogen energy, LNG remote liquid transportation, superconducting technology, etc., the service conditions of the material in the extremely low temperature environment (196 ℃ below zero or lower) are increasing, so the demands of the engineering on the test and research of the fracture toughness of the material at the extremely low temperature (196 ℃ below zero or lower) are also increasing. However, the existing transverse extensometer for measuring crack expansion amount cannot be normally used at such a low test temperature, and in addition, the original test device cannot cool the metal sample to such an extremely low temperature, so that the development and popularization of the test are restricted.
For example, chinese patent publication No. CN204177672U discloses a three-point bending test specimen clamping device for fracture toughness testing, which includes an upper clamp disposed on an upper chuck of a three-point bending testing machine, and a lower clamp disposed on a lower chuck of the three-point bending testing machine, wherein two support blocks are disposed on the lower clamp, the two support blocks are disposed at two ends of the lower clamp, and a groove matched with a support roller for supporting the three-point bending test specimen is disposed at an end of each support block.
In the patent, the supporting roller can only roll in the test process, cannot move in the horizontal direction, and the span S is kept unchanged in the test process, so that the precision of finally measured fracture toughness is improved; the supporting roller cannot move outwards suddenly in the test process, so that the test is ensured to be carried out in a quasi-static state, and the accuracy of the test result is improved; in the test process, the supporting roller is embedded into the supporting block, so that the situation of personal injury caused by flying of the supporting roller is avoided, and the personal safety of an operator is protected; however, the patent still has the problem that the measurement in the extremely low temperature environment cannot be carried out.
Therefore, in order to solve the above background problems, it is urgent to develop a device for testing the low-temperature fracture toughness of a material by cooling a liquid medium.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that proposes in the above-mentioned background problem, provide a test material low temperature fracture toughness's device through the liquid medium cooling, it can reduce the metal appearance spare that awaits measuring to extremely low temperature, but measures the horizontal extensometer of crackle expansion volume and need not to reduce extremely low temperature to can test the fracture toughness value under the extremely low temperature that metal appearance spare can not reach at conventional low temperature device.
The purpose of the utility model is realized like this: a device for testing the low-temperature fracture toughness of a material by cooling a liquid medium comprises a low-temperature water tank, wherein a through round hole is formed in the bottom of the low-temperature water tank, a water tank cylinder is arranged in the round hole, and the water tank cylinder and the low-temperature water tank are integrally arranged;
the upper part of the water tank cylinder is connected with an upper supporting mechanism, and the lower part of the water tank cylinder is connected with a lower supporting mechanism;
a sample to be measured is arranged on the upper supporting mechanism, and a transverse extensometer is arranged at the position of the notch of the sample to be measured;
a pressing mechanism is arranged above the sample to be detected;
two lower pressure heads with symmetrical positions are arranged at the bottom of the lower pressure mechanism downwards along the vertical direction.
And the top of the upper supporting mechanism is provided with a lower supporting roller.
The water tank is characterized in that internal threads are arranged in the water tank cylinder, and external threads used for matching are arranged at the joint of the upper supporting mechanism and the lower supporting mechanism and the water tank cylinder.
The bottom of the lower supporting mechanism is connected with a lower clamping end, and the top of the lower pressing mechanism is connected with an upper clamping end.
Compared with the prior art, the utility model has the advantages of it is following:
the utility model discloses a test device of material low temperature fracture toughness through liquid medium cooling utilizes the liquid cooling speed faster on the one hand, on the other hand can cool down the metal test piece to-196 ℃ or even lower temperature, has solved the restriction of conventional low temperature testing arrangement low temperature test temperature;
the utility model discloses a test device of material low temperature fracture toughness through liquid medium cooling adds the liquid that cooling used in the low temperature basin, and the liquid of adding makes the liquid level be higher than fracture toughness sample fatigue crack about 10mm more than the most advanced, consequently measure the horizontal extensometer of crack expansion volume and need not to reduce extremely low temperature to can test the fracture toughness value under the extremely low temperature that metal sample piece can not reach at conventional low temperature device.
Drawings
Fig. 1 is a schematic overall structure diagram of an apparatus for testing low-temperature fracture toughness of a material by cooling a liquid medium according to the present invention.
Wherein: 1. a low temperature water tank; 2. a water tank cylinder; 3. an upper support mechanism; 4. a lower support roller; 5. a lower support mechanism; 6. a lower clamping end; 7. a sample to be tested; 8. a transverse extensometer; 9. a pressing mechanism; 10. an upper clamping end; 11. and (4) a lower pressure head.
Detailed Description
The invention is described below with reference to the accompanying drawings and specific embodiments:
as shown in fig. 1, a device for testing the low-temperature fracture toughness of a material by cooling a liquid medium comprises a low-temperature water tank 1, wherein a through circular hole is formed in the bottom of the low-temperature water tank 1, a water tank cylinder 2 is arranged in the circular hole, and the water tank cylinder 2 and the low-temperature water tank 1 are integrally arranged;
the upper portion of basin cylinder 2 is connected and is provided with upper supporting mechanism 3, the sub-unit connection of basin cylinder 2 is provided with lower supporting mechanism 5, the top of going up supporting mechanism 3 sets up down roller 4.
In this embodiment, the water tank cylinder 2 is provided with an internal thread, and an external thread for matching is provided at the connection between the upper support mechanism 3 and the lower support mechanism 5 and the water tank cylinder 2.
In this embodiment, the upper supporting mechanism 3 is provided with a sample 7 to be measured, and a transverse extensometer 8 is installed at the notched position of the sample 7 to be measured.
In this embodiment, a pressing mechanism 9 is disposed above the sample 7 to be tested; two symmetrical lower pressing heads 11 are arranged at the bottom of the lower pressing mechanism 9 downwards along the vertical direction.
In this embodiment, the bottom of the lower support mechanism 5 is connected with a lower clamping end 6, and the top of the lower pressing mechanism 9 is connected with an upper clamping end 10.
In this embodiment, lower clamping end 6 passes through hydraulic clamping with the lower chuck of the servo fatigue testing machine of electricity liquid fixedly, it is fixed that last clamping end 10 passes through hydraulic clamping with the last chuck of the servo fatigue testing machine of electricity liquid.
In this embodiment, the utility model discloses a device for testing material low temperature fracture toughness through liquid medium cooling, its working method is as follows:
the method comprises the following steps: before the experiment, the upper supporting mechanism 3 and the lower supporting mechanism 5 are fixedly connected with the water tank cylinder 2 welded at the bottom of the water tank through threads in a threaded knob mode, so that the connection part is sealed and firmly installed; then, the lower clamping end 6 at the bottom of the lower support mechanism 5 and the electro-hydraulic servo fatigue testing machine are clamped and fixed through hydraulic pressure;
step two: the upper clamping end 10 at the top of the pressing mechanism 9 and an upper chuck of the electro-hydraulic servo fatigue testing machine are also fixed through hydraulic clamping;
step three: placing a sample 7 to be detected at the middle position of the device, enabling the middle gap of the sample 7 to be detected to face upwards, and fixing the sample at the middle position by adjusting so as not to move freely;
step four: a transverse extensometer 8 is arranged at the position of the gap of the sample 7 to be tested;
step five: adding liquid (such as liquid nitrogen and the like) for cooling into the low-temperature water tank 1, wherein the liquid level is higher than the tip of the fatigue crack of the fracture toughness sample by 10 mm;
step six: adjusting test parameters and starting a three-point bending test.
The above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (4)
1. An apparatus for testing low-temperature fracture toughness of a material by cooling with a liquid medium, is characterized in that: the device comprises a low-temperature water tank (1), wherein a through round hole is formed in the bottom of the low-temperature water tank (1), a water tank cylinder (2) is arranged in the round hole, and the water tank cylinder (2) and the low-temperature water tank (1) are integrally arranged;
the upper part of the water tank cylinder (2) is connected with an upper supporting mechanism (3), and the lower part of the water tank cylinder (2) is connected with a lower supporting mechanism (5);
a sample (7) to be measured is arranged on the upper supporting mechanism (3), and a transverse extensometer (8) is arranged at the position of an opening of the sample (7) to be measured;
a pressing mechanism (9) is arranged above the sample (7) to be detected;
two lower pressing heads (11) with symmetrical positions are arranged at the bottom of the lower pressing mechanism (9) downwards along the vertical direction.
2. The device for testing the low-temperature fracture toughness of the material by cooling the liquid medium according to claim 1, wherein: and a lower supporting roller (4) is arranged at the top of the upper supporting mechanism (3).
3. The device for testing the low-temperature fracture toughness of the material by cooling the liquid medium according to claim 1, wherein: the water tank is characterized in that internal threads are arranged in the water tank cylinder (2), and external threads used for matching are arranged at the joint of the upper supporting mechanism (3), the lower supporting mechanism (5) and the water tank cylinder (2).
4. The device for testing the low-temperature fracture toughness of the material by cooling the liquid medium according to claim 1, wherein: the bottom of the lower supporting mechanism (5) is connected with a lower clamping end (6), and the top of the lower pressing mechanism (9) is connected with an upper clamping end (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220180487.6U CN217212005U (en) | 2022-01-24 | 2022-01-24 | Device for testing low-temperature fracture toughness of material through liquid medium cooling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220180487.6U CN217212005U (en) | 2022-01-24 | 2022-01-24 | Device for testing low-temperature fracture toughness of material through liquid medium cooling |
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| CN217212005U true CN217212005U (en) | 2022-08-16 |
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| CN202220180487.6U Active CN217212005U (en) | 2022-01-24 | 2022-01-24 | Device for testing low-temperature fracture toughness of material through liquid medium cooling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347188A (en) * | 2023-12-05 | 2024-01-05 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Low-temperature fracture toughness test method for metal material |
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2022
- 2022-01-24 CN CN202220180487.6U patent/CN217212005U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117347188A (en) * | 2023-12-05 | 2024-01-05 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | Low-temperature fracture toughness test method for metal material |
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Address after: No. 188, East Outer Ring Road, Jiangyin high tech Zone, Wuxi City, Jiangsu Province Patentee after: Jiangsu Chengxin Inspection, Testing and Certification Co.,Ltd. Address before: No. 188, East Outer Ring Road, Jiangyin high tech Zone, Wuxi City, Jiangsu Province Patentee before: Jiangsu Chengxin Inspection Certification Co.,Ltd. |
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