CN113281156B - Material high-strain creep-fatigue coupling test method under low-temperature corrosion environment - Google Patents
Material high-strain creep-fatigue coupling test method under low-temperature corrosion environment Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 97
- 230000007797 corrosion Effects 0.000 title claims abstract description 97
- 230000008878 coupling Effects 0.000 title claims abstract description 33
- 238000010168 coupling process Methods 0.000 title claims abstract description 33
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 25
- 238000010998 test method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 71
- 229910052751 metal Inorganic materials 0.000 claims abstract description 47
- 239000002184 metal Substances 0.000 claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims description 21
- 238000009661 fatigue test Methods 0.000 claims description 19
- 238000005530 etching Methods 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
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- 229910001069 Ti alloy Inorganic materials 0.000 description 11
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- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
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Abstract
The application discloses a material high-strain creep-fatigue coupling test method under a low-temperature corrosion environment, which is tested by means of a test device, wherein the test device comprises a fatigue tester, a low-temperature instrument, a video extensometer, a corrosion solution container, a submersible pump arranged in the corrosion solution container, a multilayer spiral pipe, a box-shaped corrosion groove and an upper clamping rod and a lower clamping rod; the space in the box-shaped corrosion groove is divided into a cuboid chamber and a U-shaped chamber by a U-shaped overflow plate, a through hole and a liquid inlet hole for a metal sample to pass through are formed in the bottom wall of the cuboid chamber, a liquid outlet hole capable of being connected with a corrosion solution container conduit is formed in the bottom wall of the U-shaped chamber, and a plurality of layers of spiral pipes in the low-temperature instrument are respectively connected with the liquid inlet hole and the submerged pump; and (5) after the test device is assembled, tightly connecting the metal sample in the box-shaped corrosion groove, and then performing a test. The test method meets the test requirement of the high strain fatigue creep test in the low temperature corrosion environment, and can realize corrosion fatigue creep tests at different temperatures.
Description
Technical Field
The application relates to the technical field of high-strain creep-fatigue coupling test of materials, in particular to a high-strain creep-fatigue coupling test method of materials in a low-temperature corrosion environment.
Background
Creep test and fatigue test are important methods for evaluating the safety of materials, and in order to evaluate the service performance of structural materials in deep sea complex environments, the high-strain fatigue and creep performance of the materials in low-temperature corrosion environments are required to be tested. At present, less research on fatigue creep coupling loading in low-temperature corrosion environment is carried out at home and abroad, and related professional test equipment is not found. The following difficulties exist in performing fatigue creep coupling loading in a low temperature corrosive environment: the low-temperature long-time test is generally realized by a low-temperature environment box, but the environment box cavity is larger, and the test requires a longer connecting rod, which is not beneficial to the stability of the fatigue test; the environment box is a closed environment, so that the volatilization level of the solution and the replenishing solution are difficult to effectively observe, and the instability of the temperature and the corrosion environment is easy to cause; the conventional contact type extensometer can be corroded under the corrosive environment, electrochemical corrosion is easily caused at the contact point, and the strain gauge deformation exceeds the elastic limit of the extensometer under the high strain measurement condition by using the strain gauge, so that the test requirement of high strain fatigue cannot be met.
Therefore, to overcome the above problems, it is necessary to develop a test method for fatigue creep composite loading in a low temperature corrosion environment.
Disclosure of Invention
In order to realize the evaluation of the service performance of the structural material under the deep sea complex working condition, GB/T20120.1-2006 section 1 of corrosion and fatigue test of metals and alloys: the method solves the problems of difficult elimination of torque effect, strain measurement and long-term stability of the whole system generated in the process of simulating temperature control, corrosion solution environment maintenance and fatigue test under deep sea complex working conditions, and realizes the performance test of the high-strain creep-fatigue coupling test of the material in the low-temperature corrosion environment.
In order to achieve the above purpose, the application adopts the following specific scheme:
the high-strain creep-fatigue coupling test method for the material in the low-temperature corrosion environment is carried out by means of a high-strain creep-fatigue coupling test device, wherein the high-strain creep-fatigue coupling test device comprises a fatigue test machine, a low-temperature instrument, a video extensometer, a submersible pump, a corrosion solution container, a multilayer spiral pipe, a box-shaped corrosion groove and a pair of upper clamping rods and lower clamping rods which can be oppositely arranged and clamped on the fatigue test machine;
cylindrical grooves which can be matched with the metal sample are formed in the upper clamping rod and the lower clamping rod;
the front wall of the box-shaped corrosion groove adopts a test plate which can be matched with a video extensometer for use, a U-shaped overflow plate fixedly connected with the test plate is arranged in the box-shaped corrosion groove, two parallel surfaces of the U-shaped overflow plate are parallel to the left and right side walls of the box-shaped corrosion groove, the bottom surface of the U-shaped overflow plate is parallel to the rear wall of the box-shaped corrosion groove, the space in the box-shaped corrosion groove is divided into a cuboid chamber and a U-shaped chamber by the U-shaped overflow plate, a through hole for a metal sample to pass through is formed in the bottom wall of the cuboid chamber, and the metal sample can be tightly connected with the box-shaped corrosion groove through a rubber plug and a locking flange; the bottom wall of the cuboid chamber is also provided with a liquid inlet, the bottom wall of the U-shaped chamber is provided with a liquid outlet, the liquid inlet is connected with a plurality of layers of spiral pipes in the low-temperature instrument through a conduit, one end of each layer of spiral pipes, which is far away from the liquid inlet, is connected with a submersible pump arranged in the corrosive solution container through a conduit, and the liquid outlet is connected with the corrosive solution container through a conduit;
the high-strain creep-fatigue coupling test method of the material mainly comprises the following steps:
(1) Designing a dumbbell-shaped metal sample with thick ends and thin middle parts according to the standard in GB/T20120.1-2006, wherein the metal sample comprises a working section and upper and lower clamping sections arranged at two ends of the working section, threads are uniformly distributed on the upper and lower clamping sections, a rubber plug is arranged on the lower clamping section of the metal sample, and the upper end face of the rubber plug is flush with the upper end face of the lower clamping section;
(2) Placing the metal sample provided with the rubber plug in the through hole, ensuring that the upper end surface of the rubber plug is flush with the upper surface of the bottom wall of the box-shaped corrosion groove, and locking the metal sample and the box-shaped corrosion groove by using a locking flange to ensure that the metal sample and the box-shaped corrosion groove are tightly connected;
(3) The upper clamping section and the lower clamping section of the metal sample are respectively in threaded connection with the upper clamping rod and the lower clamping rod, and the upper clamping section of the metal sample is locked with the upper clamping rod by using a locking bolt;
(4) Two ends of the multilayer spiral pipe are respectively connected with the liquid inlet hole and the submersible pump through the guide pipe, and the liquid outlet hole is connected with the corrosive solution container through the guide pipe;
(5) The upper clamping rod and the lower clamping rod are respectively clamped on the fatigue testing machine, the temperature of the low-temperature instrument is regulated to enable the corrosion solution in the box-shaped corrosion groove to reach the test temperature and keep constant, and the video extensometer is matched with the test board to record the real-time strain of the metal sample in the whole experimental process; and synchronously starting the fatigue testing machine, the video extensometer, the low-temperature instrument and the submersible pump to perform the test.
Further, the high-strain creep-fatigue coupling test device also comprises a digital thermometer for monitoring the temperature in the box-shaped corrosion groove.
Further, the rubber plug is a conical rubber plug.
Further, a advection piece is arranged at the liquid inlet of the box-shaped corrosion groove so as to ensure that the corrosion solution stably flows into the box-shaped corrosion groove.
Further, the box-shaped corrosion groove is made of acrylic materials.
Further, the etching solution is 3.5% NaCl solution.
Further, the diameter of the middle thinner working section in the metal sample is 5mm; the diameter of the thicker clamping section at the two ends is 20mm.
The test machine loading force acts on the lower clamping section of the metal test sample, and the locking bolt locks the upper clamping rod and the upper clamping section of the metal test sample, so that the torque effect generated in the fatigue test process can be eliminated. The test principle of the test method is as follows: the corrosion solution is pumped by the submerged pump and then enters the multilayer spiral pipe arranged in the low-temperature instrument (the area of the corrosion solution and a low-temperature medium in the low-temperature instrument is increased through the multilayer spiral pipe, the aim of quickly cooling is fulfilled), the test temperature can be adjusted through the low-temperature instrument, the corrosion solution flows into the box-shaped corrosion groove from the multilayer spiral pipe through the liquid inlet hole on the bottom wall of the box-shaped corrosion groove, the corrosion solution can slowly overflow upwards through the advection piece, and then the corrosion solution flows back into the corrosion solution container. The circulation of the etching solution can ensure the temperature of the etching solution in the box-shaped etching tank; the video extensometer and the test board cooperate to measure the real-time strain of the metal sample.
The beneficial effects are that:
the test method is carried out by means of the high-strain creep-fatigue coupling test device, the high-strain creep-fatigue coupling test device completely meets the test requirements of the high-strain fatigue creep test in the low-temperature corrosion environment, and corrosion fatigue creep tests at different temperatures can be realized. The test method has the advantages of simple steps, easy operation, good centering and stable and reliable test result.
Drawings
FIG. 1 is a schematic structural diagram of a high strain creep-fatigue coupling test apparatus according to the present application.
Fig. 2 is an enlarged view at fig. I.
Fig. 3 is one of the cross-sectional views of fig. 2.
Fig. 4 is a second cross-sectional view of fig. 2.
FIG. 5 is a graph showing the high strain creep-fatigue coupling test obtained in example 1 of the present application.
The graphic indicia: 1. the device comprises an upper clamping rod, 2, a locking bolt, 3, a metal sample, 4, a test board, 5, a U-shaped overflow board, 6, a rubber plug, 7, a locking flange, 8, a advection piece, 9, a liquid inlet, 10, a liquid outlet, 11, a lower clamping rod, 12, a fatigue testing machine, 13, a video extensometer, 14, a multilayer spiral pipe, 15, a cryometer, 16, a digital display thermometer, 17 and a corrosive solution container.
Detailed Description
The technical solutions of the present application will be clearly and completely described below in connection with specific embodiments, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
Referring to fig. 1-4, the high strain creep-fatigue coupling test device comprises a fatigue tester 12, a cryometer 15, a video extensometer 13, a submersible pump, an etching solution container 17, a multilayer spiral pipe 14, a box-shaped etching tank and a pair of upper and lower clamping rods which can be oppositely arranged and clamped on the fatigue tester 12;
cylindrical grooves which can be matched with the metal sample 3 are formed in the upper clamping rod 1 and the lower clamping rod 11;
the front wall of the box-shaped corrosion groove adopts a test board 4 which can be matched with a video extensometer 13 for use, a U-shaped overflow board 5 which is fixedly connected with the test board 4 is arranged in the box-shaped corrosion groove, two parallel surfaces of the U-shaped overflow board 5 are parallel to the left side wall and the right side wall of the box-shaped corrosion groove, the bottom surface of the U-shaped overflow board is parallel to the rear wall of the box-shaped corrosion groove, the U-shaped overflow board 5 divides the space in the box-shaped corrosion groove into a cuboid chamber and a U-shaped chamber, a through hole for a metal sample 3 to pass through is formed in the bottom wall of the cuboid chamber, and the metal sample 3 can be tightly connected with the box-shaped corrosion groove through a rubber plug 6 and a locking flange 7; the bottom wall of the cuboid chamber is also provided with a liquid inlet hole 9,U type chamber, the bottom wall of the cuboid chamber is provided with a liquid outlet hole 10, the liquid inlet hole 9 is connected with a plurality of layers of spiral pipes 14 in the low-temperature instrument 15 through a conduit, one end of each layer of spiral pipes 14, which is far away from the liquid inlet hole 9, is connected with a submersible pump arranged in the corrosive solution container 17 through a conduit, and the liquid outlet hole 10 is connected with the corrosive solution container 17 through a conduit;
the high-strain creep-fatigue coupling test method of the material mainly comprises the following steps:
(1) Designing a dumbbell-shaped metal sample 3 with thick ends and thin middle parts according to the standard in GB/T20120.1-2006, wherein the metal sample 3 comprises a working section and upper and lower clamping sections arranged at the two ends of the working section, and the diameter of the middle thinner working section is 5mm; the diameter of the clamping sections with thicker ends is 20mm, threads are uniformly distributed on the upper clamping section and the lower clamping section, the rubber plug 6 is arranged on the lower clamping section of the metal sample 3, and the upper end face of the rubber plug 6 is flush with the upper end face of the lower clamping section;
(2) Placing the metal sample 3 provided with the rubber plug 6 in the through hole, ensuring that the upper end surface of the rubber plug 6 is flush with the upper surface of the bottom wall of the box-shaped corrosion groove, and locking the metal sample 3 with the box-shaped corrosion groove by using a locking flange to ensure that the metal sample 3 and the box-shaped corrosion groove are tightly connected;
(3) The upper clamping section and the lower clamping section of the metal sample 3 are respectively in threaded connection with the upper clamping rod and the lower clamping rod, and the upper clamping section of the metal sample 3 is locked with the upper clamping rod 1 by a locking bolt 2;
(4) Two ends of the multilayer spiral pipe 14 are respectively connected with the liquid inlet hole 9 and the submersible pump through a conduit, and the liquid outlet hole 10 is connected with the corrosive solution container 17 through a conduit;
(5) The upper clamping rod 1 and the lower clamping rod 11 are respectively clamped on the fatigue testing machine 12, the temperature of the low-temperature instrument 15 is adjusted to enable the corrosion solution in the box-shaped corrosion groove to reach the test temperature and keep constant, and the video extensometer 13 is matched with the test board 4 to record the real-time strain of the metal sample 3 in the whole experimental process; the fatigue testing machine 12, the video extensometer 13, the cryometer 15 and the submersible pump are synchronously started, so that the test can be performed.
In detail, the high strain creep-fatigue coupling test apparatus further includes a digital thermometer 16 for monitoring the temperature in the box-like corrosion tank.
Wherein the rubber plug 6 is a conical rubber plug.
It should be noted that, the liquid inlet of the box-shaped etching tank is provided with a advection piece to ensure that the etching solution stably flows into the box-shaped etching tank.
Preferably, the box-shaped corrosion groove is made of acrylic material.
Example 1
The high-strain creep-fatigue coupling test device comprises a fatigue tester 12, a low-temperature instrument 15, a video extensometer 13, a submersible pump, an etching solution container 17, a multilayer spiral pipe 14, a box-shaped etching groove and a pair of upper and lower clamping rods which can be oppositely arranged and clamped on the fatigue tester 12;
cylindrical grooves which can be matched with the metal sample 3 are formed in the upper clamping rod 1 and the lower clamping rod 11;
the front wall of the box-shaped corrosion groove adopts a test board 4 which can be matched with a video extensometer 13 for use, a U-shaped overflow board 5 which is fixedly connected with the test board 4 is arranged in the box-shaped corrosion groove, two parallel surfaces of the U-shaped overflow board 5 are parallel to the left side wall and the right side wall of the box-shaped corrosion groove, the bottom surface of the U-shaped overflow board is parallel to the rear wall of the box-shaped corrosion groove, the U-shaped overflow board 5 divides the space in the box-shaped corrosion groove into a cuboid chamber and a U-shaped chamber, a through hole for a titanium alloy sample to pass through is formed in the bottom wall of the cuboid chamber, and the titanium alloy sample can be tightly connected with the box-shaped corrosion groove through a rubber plug 6 and a locking flange 7; the bottom wall of the cuboid chamber is also provided with a liquid inlet hole 9,U type chamber, the bottom wall of the cuboid chamber is provided with a liquid outlet hole 10, the liquid inlet hole 9 is connected with a plurality of layers of spiral pipes 14 in the low-temperature instrument 15 through a conduit, one end of each layer of spiral pipes 14, which is far away from the liquid inlet hole 9, is connected with a submersible pump arranged in the corrosive solution container 17 through a conduit, and the liquid outlet hole 10 is connected with the corrosive solution container 17 through a conduit; the etching solution contained in the etching solution container is 3.5 percent NaCl solution;
the high-strain creep-fatigue coupling test method of the material mainly comprises the following steps:
(1) Designing a dumbbell-shaped titanium alloy sample with thick ends and thin middle ends, wherein the titanium alloy sample comprises a working section and upper and lower clamping sections arranged at the two ends of the working section, the length of the middle thinner working section is 40mm, and the diameter of the middle thinner working section is 5mm; the diameter of the upper and lower clamping sections with thicker ends is 20mm, the length of the upper clamping section is 20mm, the length of the lower clamping section is 40mm, threads are uniformly distributed on the upper and lower clamping sections, the rubber plug 6 is arranged on the lower clamping section of the titanium alloy sample, and the upper end face of the rubber plug 6 is flush with the upper end face of the lower clamping section;
(2) Placing the titanium alloy sample with the rubber plug 6 in the through hole to ensure that the upper end surface of the rubber plug 6 is flush with the upper surface of the bottom wall of the box-shaped corrosion groove, and then locking the titanium alloy sample with the box-shaped corrosion groove by using a locking flange to ensure that the titanium alloy sample and the box-shaped corrosion groove are tightly connected;
(3) The upper clamping section and the lower clamping section of the titanium alloy sample are respectively in threaded connection with the upper clamping rod and the lower clamping rod, and the upper clamping section of the metal sample 3 is locked with the upper clamping rod 1 by a locking bolt 2;
(4) Two ends of the multilayer spiral pipe 14 are respectively connected with the liquid inlet hole 9 and the submersible pump through a conduit, and the liquid outlet hole 10 is connected with the corrosive solution container 17 through a conduit;
(5) The upper clamping rod 1 and the lower clamping rod 11 are respectively clamped on the fatigue testing machine 12, the temperature of the low-temperature instrument 15 is adjusted to enable the corrosion solution in the box-shaped corrosion groove to reach the test temperature (4 ℃) and keep constant, and the real-time strain of the titanium alloy sample in the whole experimental process can be recorded through the cooperation of the video extensometer 13 and the test board 4; the fatigue testing machine 12, the video extensometer 13, the cryometer 15 and the submersible pump are synchronously started, so that the test can be performed, the test is a cycle of pulling to loading, maintaining loading and unloading, and fig. 5 is a curve of the fatigue creep coupling loading test result of the titanium alloy sample by the test method:
as can be seen from FIG. 5, the test method is adopted to satisfactorily complete the low-temperature corrosion fatigue creep test, the test system can stably run for a long time, the concentration and the temperature of the corrosion solution are constant in the whole test process, the strain measurement is continuous, and an ideal test curve can be obtained. The test curve and the test sample fracture conform to the failure characteristics of the creep fatigue test.
The above description is only of the preferred embodiment of the present application, and is not intended to limit the present application in any way. All equivalent changes or modifications made according to the essence of the present application should be included in the scope of the present application.
Claims (7)
1. The high-strain creep-fatigue coupling test method for the material in the low-temperature corrosion environment is characterized by comprising the following steps of: the high-strain creep-fatigue coupling test device comprises a fatigue test machine, a low-temperature instrument, a video extensometer, a submersible pump, an etching solution container, a multilayer spiral pipe, a box-shaped etching groove and a pair of upper clamping rods and lower clamping rods which can be oppositely arranged and clamped on the fatigue test machine;
cylindrical grooves which can be matched with the metal sample are formed in the upper clamping rod and the lower clamping rod;
the front wall of the box-shaped corrosion groove adopts a test plate which can be matched with a video extensometer for use, a U-shaped overflow plate fixedly connected with the test plate is arranged in the box-shaped corrosion groove, two parallel surfaces of the U-shaped overflow plate are parallel to the left and right side walls of the box-shaped corrosion groove, the bottom surface of the U-shaped overflow plate is parallel to the rear wall of the box-shaped corrosion groove, the space in the box-shaped corrosion groove is divided into a cuboid chamber and a U-shaped chamber by the U-shaped overflow plate, a through hole for a metal sample to pass through is formed in the bottom wall of the cuboid chamber, and the metal sample can be tightly connected with the box-shaped corrosion groove through a rubber plug and a locking flange; the bottom wall of the cuboid chamber is also provided with a liquid inlet, the bottom wall of the U-shaped chamber is provided with a liquid outlet, the liquid inlet is connected with a plurality of layers of spiral pipes in the low-temperature instrument through a conduit, one end of each layer of spiral pipes, which is far away from the liquid inlet, is connected with a submersible pump arranged in the corrosive solution container through a conduit, and the liquid outlet is connected with the corrosive solution container through a conduit;
the high-strain creep-fatigue coupling test method of the material mainly comprises the following steps:
(1) Designing a dumbbell-shaped metal sample with thick ends and thin middle parts according to the standard in GB/T20120.1-2006, wherein the metal sample comprises a working section and upper and lower clamping sections arranged at two ends of the working section, threads are uniformly distributed on the upper and lower clamping sections, a rubber plug is arranged on the lower clamping section of the metal sample, and the upper end face of the rubber plug is flush with the upper end face of the lower clamping section;
(2) Placing the metal sample provided with the rubber plug in the through hole, ensuring that the upper end surface of the rubber plug is flush with the upper surface of the bottom wall of the box-shaped corrosion groove, and locking the metal sample and the box-shaped corrosion groove by using a locking flange to ensure that the metal sample and the box-shaped corrosion groove are tightly connected;
(3) The upper clamping section and the lower clamping section of the metal sample are respectively in threaded connection with the upper clamping rod and the lower clamping rod, and the upper clamping section of the metal sample is locked with the upper clamping rod by using a locking bolt;
(4) Two ends of the multilayer spiral pipe are respectively connected with the liquid inlet hole and the submersible pump through the guide pipe, and the liquid outlet hole is connected with the corrosive solution container through the guide pipe;
(5) The upper clamping rod and the lower clamping rod are respectively clamped on the fatigue testing machine, the temperature of the low-temperature instrument is regulated to enable the corrosion solution in the box-shaped corrosion groove to reach the test temperature and keep constant, and the video extensometer is matched with the test board to record the real-time strain of the metal sample in the whole experimental process; and synchronously starting the fatigue testing machine, the video extensometer, the low-temperature instrument and the submersible pump to perform the test.
2. The method for testing high-strain creep-fatigue coupling of a material in a low-temperature corrosion environment according to claim 1, wherein the method comprises the following steps: the high-strain creep-fatigue coupling test device also comprises a digital thermometer for monitoring the temperature in the box-shaped corrosion groove.
3. The method for testing high-strain creep-fatigue coupling of a material in a low-temperature corrosion environment according to claim 1, wherein the method comprises the following steps: the rubber plug is a conical rubber plug.
4. The method for testing high-strain creep-fatigue coupling of a material in a low-temperature corrosion environment according to claim 1, wherein the method comprises the following steps: and a advection piece is arranged at the liquid inlet of the box-shaped corrosion groove so as to ensure that the corrosion solution stably flows into the box-shaped corrosion groove.
5. The method for testing high-strain creep-fatigue coupling of a material in a low-temperature corrosion environment according to claim 1, wherein the method comprises the following steps: the box-shaped corrosion groove is made of acrylic materials.
6. The method for testing high-strain creep-fatigue coupling of a material in a low-temperature corrosion environment according to claim 1, wherein the method comprises the following steps: the etching solution was 3.5% NaCl solution.
7. The method for testing high-strain creep-fatigue coupling of a material in a low-temperature corrosion environment according to claim 1, wherein the method comprises the following steps: the diameter of the middle thinner working section in the metal sample is 5mm; the diameter of the thicker clamping section at the two ends is 20mm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980066567U (en) * | 1997-05-13 | 1998-12-05 | 배동호 | Corrosion tank for horizontal fatigue tester |
| CN102791402A (en) * | 2010-02-05 | 2012-11-21 | 西克索马特公司 | Method and apparatus of forming a wrought material having a refined grain structure |
| CN211741011U (en) * | 2020-02-28 | 2020-10-23 | 西安建筑科技大学 | Metal material corrosion fatigue test device |
-
2021
- 2021-06-21 CN CN202110687188.1A patent/CN113281156B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19980066567U (en) * | 1997-05-13 | 1998-12-05 | 배동호 | Corrosion tank for horizontal fatigue tester |
| CN102791402A (en) * | 2010-02-05 | 2012-11-21 | 西克索马特公司 | Method and apparatus of forming a wrought material having a refined grain structure |
| CN211741011U (en) * | 2020-02-28 | 2020-10-23 | 西安建筑科技大学 | Metal material corrosion fatigue test device |
Non-Patent Citations (1)
| Title |
|---|
| 不同环境下对2D70铝合金低周疲劳性能的研究;施翔晶;马华;;上海电气技术(02);全文 * |
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