CN115541409B - Metal cylinder sample fatigue test device suitable for under ultra-low temperature environment - Google Patents
Metal cylinder sample fatigue test device suitable for under ultra-low temperature environment Download PDFInfo
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- CN115541409B CN115541409B CN202211479286.7A CN202211479286A CN115541409B CN 115541409 B CN115541409 B CN 115541409B CN 202211479286 A CN202211479286 A CN 202211479286A CN 115541409 B CN115541409 B CN 115541409B
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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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- 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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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
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0266—Cylindrical specimens
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
Abstract
The invention discloses a metal cylinder sample fatigue testing device suitable for an ultralow temperature environment, which comprises a low-temperature environment box, a liquid nitrogen box, a movable chuck and a fixed chuck, wherein the liquid nitrogen box penetrates through the low-temperature environment box, the liquid nitrogen box is cylindrical, the movable chuck is arranged at the top end inside the liquid nitrogen box, a movable chuck seat plate is arranged between the movable chuck and the liquid nitrogen box, an air inlet and an air outlet are arranged on the side wall of the middle part of the liquid nitrogen box, the air inlet and the air outlet are positioned between the movable chuck and the fixed chuck, the air inlet is communicated with a low-temperature guide pipe of a liquid nitrogen pump, the fixed chuck is arranged at the bottom end inside the liquid nitrogen box, the fixed chuck is in threaded connection with the liquid nitrogen box, and the movable chuck and the fixed chuck are respectively in threaded connection with two ends of a cylinder fatigue sample. The metal cylindrical sample fatigue testing device adopting the structure is suitable for being used in an ultralow temperature environment, can realize continuous low temperature of an experimental environment, greatly reduces liquid nitrogen consumption, and is low in cost, reliable in structure and high in safety.
Description
Technical Field
The invention relates to the technical field of fatigue detection of ultralow-temperature materials, in particular to a metal cylinder sample fatigue testing device suitable for an ultralow-temperature environment.
Background
With the development of economic construction in China, the industries of ships, marine oil, natural gas and the like have been increased at a high speed for a long time. The rapid development of ships and marine industries such as petroleum and natural gas has put higher requirements on the quantity and quality of shipbuilding and corresponding metal materials. In view of severe service conditions such as waves, sea tides, storms, cold running ice and the like existing in the marine environment, the corresponding metal material not only needs to have excellent mechanical properties such as high strength and high toughness, but also needs to be capable of meeting long-term service conditions at ultralow temperature. Over the past one hundred and fifty years, over 80% of metal parts have failed during use due to fatigue. More importantly, the fatigue failure has no warning sign and is difficult to discover, which often causes sudden catastrophic accidents and endangers the human body, property and even national defense safety of the country. Therefore, fatigue failure is one of the main failure modes of metal materials and has been the research hotspot of metal materials. However, the ultra-low temperature fatigue test is always a difficult point in the industry, the existing test device is complex and expensive in cost, and the extensive development of the ultra-low temperature fatigue research of metal materials cannot be met.
Disclosure of Invention
The invention aims to provide a metal cylindrical sample fatigue testing device suitable for an ultralow-temperature environment, which can realize continuous low temperature of an experimental environment, greatly reduce liquid nitrogen consumption, and has the advantages of low cost, reliable structure and high safety.
In order to achieve the purpose, the invention provides a metal cylinder sample fatigue testing device suitable for an ultralow temperature environment, which comprises a low-temperature environment box, a liquid nitrogen box, a movable chuck and a fixed chuck, wherein the liquid nitrogen box penetrates through the low-temperature environment box, the liquid nitrogen box is cylindrical, the movable chuck is arranged at the top end inside the liquid nitrogen box, a movable chuck seat plate is arranged between the movable chuck and the liquid nitrogen box, an air inlet and an air outlet are arranged on the side wall in the middle of the liquid nitrogen box, the air inlet and the air outlet are positioned between the movable chuck and the fixed chuck, the air inlet is communicated with a low-temperature conduit of a liquid nitrogen pump, an air outlet valve is arranged on the air outlet, the fixed chuck is arranged at the bottom end inside the liquid nitrogen box, the fixed chuck is in threaded connection with the liquid nitrogen box, and the movable chuck and the fixed chuck are respectively in threaded connection with two ends of a cylinder fatigue sample.
Preferably, the top of moving the chuck is provided with the top cap, the central authorities of top cap are provided with first internal thread hole, first internal thread hole downwardly extending to move the middle part of chuck, the bottom central authorities of moving the chuck are provided with second internal thread hole, the top of cylinder fatigue sample stretch into in the second internal thread hole and with move chuck threaded connection.
Preferably, move the chuck bedplate set up in the top of liquid nitrogen case, the lower surface of top cap with the upper surface that moves the chuck bedplate contacts, move the chuck bedplate with liquid nitrogen case passes through a plurality of fastening screw fixed connection, the bottom of moving the chuck bedplate is provided with the LNG sealing washer, move the bottom of chuck and pass move the chuck bedplate with the LNG sealing washer.
Preferably, the top central authorities of deciding the chuck are provided with third internal thread hole, the bottom of cylinder fatigue sample stretches into third internal thread hole and with decide chuck threaded connection, be provided with external screw thread portion on deciding the outer wall of chuck, external screw thread portion with the internal thread portion threaded connection of liquid nitrogen bottom of the case portion, the bottom of deciding the chuck is provided with the collet, the collet with the lower surface of liquid nitrogen case contacts, the central authorities of collet are provided with fourth internal thread hole, fourth internal thread hole upwards extends to decide the middle part of chuck.
Therefore, the metal cylindrical sample fatigue testing device adopting the structure is suitable for the ultra-low temperature environment, the continuous low temperature of the experimental environment is realized through the matching of the small low-temperature liquid nitrogen box and the low-temperature environment box, the liquid nitrogen consumption is greatly reduced, and the testing cost is saved; the cylinder fatigue test sample is connected with a chuck in the experimental device through threads, different pressures are applied to the cylinder fatigue test sample through the traction of the chuck to move, and the cylinder fatigue test sample is effectively combined with a fatigue testing machine; the threaded calibers of the movable chuck and the fixed chuck can be freely processed, and the device is suitable for cylinder fatigue samples of different specifications. The device has the advantages of simple structure, easy operation, low cost, reliable structure and high safety, and is suitable for fatigue tests of various cylindrical samples in an ultralow temperature environment.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a metal cylinder sample fatigue testing device suitable for use in an ultralow temperature environment.
Reference numerals
1. A low temperature environment chamber; 11. a notch; 2. a liquid nitrogen tank; 21. an air inlet; 22. a liquid nitrogen pump low temperature conduit; 23. an air outlet; 24. an air outlet valve; 3. a movable chuck; 31. a top cover; 32. a first internally threaded bore; 33. a second internally threaded bore; 4. fixing a chuck; 41. a bottom support; 42. a third internally threaded bore; 43. a fourth internally threaded bore; 44. an external threaded portion; 5. a cylindrical fatigue test sample; 6. a movable chuck base plate; 61. fastening screws; 62. LNG sealing washer.
Detailed Description
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
Examples
As shown in the figure, the metal cylinder sample fatigue testing device suitable for the ultra-low temperature environment comprises a low-temperature environment box 1, a liquid nitrogen box 2, a movable chuck 3 and a fixed chuck 4. The top and the bottom of the low-temperature environment box 1 are both provided with notches 11, and an upper chuck and a lower chuck of the fatigue testing machine penetrate through the notches 11 to be connected with the liquid nitrogen box 2. The dual cooling measures of the low-temperature environment box 1 and the liquid nitrogen box 2 can keep the test environment at a continuous low temperature, so that the test device can perform an ultralow-temperature fatigue test at-196 ℃. An observation window is arranged on the door of the low-temperature environment box 1 and used for observing the gas outlet state of the liquid nitrogen box 2. A guide rail is arranged at the bottom of the low-temperature environment box 1, so that the device can freely move in the direction of a sample. The low-temperature environment box 1 is cooled by a compression pump, the gasification speed of liquid nitrogen in the liquid nitrogen box 2 can be slowed down, the low-temperature environment box 1 is not adopted under special conditions, and the testing environment of-196 ℃ can be achieved by winding heat-preservation cotton with the thickness of 5cm outside the liquid nitrogen box 2.
The top of the movable chuck 3 is provided with a top cover 31, and the top cover 31 is integrally connected with the movable chuck 3. The top cover 31 is provided at the center thereof with a first internally threaded hole 32, the first internally threaded hole 32 extending downward to the middle of the movable jaw 3, and the first internally threaded hole 32 is used for connecting with an upper jaw of the fatigue testing machine. The center of the bottom of the movable chuck 3 is provided with a second internal threaded hole 33, and the top end of the cylindrical fatigue test sample 5 extends into the second internal threaded hole 33 and is in threaded connection with the movable chuck 3. The lower surface of the top cover 31 contacts with the upper surface of the movable chuck base plate 6, and the bottom of the movable chuck 3 penetrates through the movable chuck base plate 6 and the LNG sealing ring 62.
Be provided with air inlet 21 and gas outlet 23 on the lateral wall at liquid nitrogen case 2 middle part, air inlet 21 and gas outlet 23 are located and move chuck 3 and decide between the chuck 4, and air inlet 21 and liquid nitrogen pump low temperature pipe 22 intercommunication input low temperature liquid nitrogen in to liquid nitrogen case 2, provide the low temperature test environment. And an air outlet valve 24 is arranged on the air outlet 23, so that the release of the internal pressure of the liquid nitrogen in the liquid nitrogen box 2 in the initial nitrogen inlet gasification process is ensured, and the safety of the test device is ensured.
The inside bottom of liquid nitrogen case 2 is provided with decides chuck 4, decides the top center of chuck 4 and is provided with third internal thread hole 42, and the bottom of cylinder fatigue sample 5 stretches into third internal thread hole 42 and with decide chuck 4 threaded connection. The outer wall of the fixed chuck 4 is provided with an external thread part 44, and the external thread part 44 is in threaded connection with an internal thread part at the bottom of the liquid nitrogen tank 2, so that the fixed chuck 4 and the liquid nitrogen tank 2 are kept fixed. The bottom of deciding chuck 4 is provided with collet 41, collet 41 with decide chuck 4 body coupling, collet 41 contacts with the lower surface of liquid nitrogen box 2. The center of the bottom support 41 is provided with a fourth internal thread hole 43, the fourth internal thread hole 43 extends upwards to the middle part of the fixed chuck 4, and the fourth internal thread hole 43 is in threaded connection with the lower chuck of the fatigue testing machine.
The thread length of the two ends of the cylindrical fatigue test sample 5 is larger than the length of the second internal thread hole 33 and the third internal thread hole 42, so that the thread self-locking after pressure loading is realized, the structure is reliable, and the test sample is prevented from loosening in the cyclic loading process.
Therefore, the metal cylindrical sample fatigue testing device adopting the structure is suitable for the ultra-low temperature environment, the continuous low temperature of the experimental environment is realized through the matching of the small low-temperature liquid nitrogen box 2 and the low-temperature environment box 1, the liquid nitrogen consumption is greatly reduced, and the testing cost is saved; the cylindrical fatigue test sample 5 is connected with a chuck in the experimental device through threads, different pressures are applied to the cylindrical fatigue test sample 5 through the traction of the chuck to move, and the cylindrical fatigue test sample 5 is effectively combined with a fatigue testing machine; the thread calibers of the movable chuck 3 and the fixed chuck 4 can be freely processed, and the device is suitable for cylindrical fatigue samples 5 with different specifications. The device has the advantages of simple structure, easy operation, low cost, reliable structure and high safety, and is suitable for fatigue tests of various cylindrical samples in an ultralow temperature environment.
Finally, it should be noted that: the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.
Claims (2)
1. The utility model provides a metal cylinder sample fatigue test device suitable for under ultra-low temperature environment which characterized in that: the liquid nitrogen box penetrates through the low-temperature environment box, the liquid nitrogen box is cylindrical, the movable chuck is arranged at the top end inside the liquid nitrogen box, a movable chuck base plate is arranged between the movable chuck and the liquid nitrogen box, an air inlet and an air outlet are formed in the side wall of the middle part of the liquid nitrogen box and are positioned between the movable chuck and the fixed chuck, the air inlet is communicated with a low-temperature conduit of a liquid nitrogen pump, an air outlet valve is arranged on the air outlet, the fixed chuck is arranged at the bottom end inside the liquid nitrogen box and is in threaded connection with the liquid nitrogen box, and the movable chuck and the fixed chuck are respectively in threaded connection with two ends of a cylindrical fatigue sample; the top of the movable chuck is provided with a top cover, the movable chuck is integrally connected with the top cover, the center of the top cover is provided with a first internal threaded hole, the first internal threaded hole extends downwards to the middle of the movable chuck, the center of the bottom of the movable chuck is provided with a second internal threaded hole, and the top end of the cylindrical fatigue sample extends into the second internal threaded hole and is in threaded connection with the movable chuck; move the chuck bedplate set up in the top of liquid nitrogen case, the lower surface of top cap with the upper surface that moves the chuck bedplate contacts, move the chuck bedplate with liquid nitrogen case passes through a plurality of fastening screw fixed connection, the bottom of moving the chuck bedplate is provided with the LNG sealing washer, the bottom of moving the chuck passes move the chuck bedplate with the LNG sealing washer.
2. The metal cylinder specimen fatigue testing device suitable for the ultra-low temperature environment according to claim 1, characterized in that: decide the top central authorities of chuck and be provided with third internal thread hole, the bottom of cylinder fatigue sample stretches into third internal thread hole and with decide chuck threaded connection, be provided with external screw thread portion on deciding the outer wall of chuck, external screw thread portion with the internal thread portion threaded connection of liquid nitrogen bottom of the case portion, the bottom of deciding the chuck is provided with the collet, the collet with the lower surface of liquid nitrogen case contacts, the central authorities of collet are provided with fourth internal thread hole, fourth internal thread hole upwards extends to decide the middle part of chuck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211479286.7A CN115541409B (en) | 2022-11-24 | 2022-11-24 | Metal cylinder sample fatigue test device suitable for under ultra-low temperature environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211479286.7A CN115541409B (en) | 2022-11-24 | 2022-11-24 | Metal cylinder sample fatigue test device suitable for under ultra-low temperature environment |
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| CN115541409A CN115541409A (en) | 2022-12-30 |
| CN115541409B true CN115541409B (en) | 2023-03-07 |
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| MX2019009874A (en) * | 2017-02-17 | 2019-10-07 | Goff Omega Holdings Llc | Testing method for hydrogen embrittlement. |
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| CN112595575A (en) * | 2020-11-09 | 2021-04-02 | 南京工业大学 | Test device and method for testing various mechanical properties in high-temperature molten salt corrosion environment |
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