CN112763404A - Test system for joint coupling effect of salt spray corrosion and fatigue load - Google Patents
Test system for joint coupling effect of salt spray corrosion and fatigue load Download PDFInfo
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- CN112763404A CN112763404A CN202110108749.8A CN202110108749A CN112763404A CN 112763404 A CN112763404 A CN 112763404A CN 202110108749 A CN202110108749 A CN 202110108749A CN 112763404 A CN112763404 A CN 112763404A
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
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Abstract
The invention relates to a test system for joint coupling effect of salt spray accelerated corrosion and fatigue load. In particular, the invention is suitable for the experimental study of bearing reciprocating fatigue load under the long-term corrosion environment. A test system for joint coupling effect of salt spray corrosion and fatigue load comprises a fatigue test system, a corrosion test system and a computer, wherein the fatigue test system comprises a fatigue testing machine and a test piece; the corrosion test system comprises a salt spray test box, a blower, a corrosion fatigue test box, a ventilation pipe, a spraying pipe, a fog discharging pipe, a rubber sleeve, a protection plate and a collection box; the computer controls the work and the intermittent time of the salt spray test box and the blower; the invention ensures that the test is carried out, and simultaneously protects fatigue loading and other equipment from corrosion attack.
Description
Technical Field
The invention relates to a test system for joint coupling effect of salt spray accelerated corrosion and fatigue load. In particular, the invention is suitable for the experimental study of bearing reciprocating fatigue load under the long-term corrosion environment.
Background
In the existing corrosion fatigue test, a salt spray testing machine is usually adopted to pre-corrode a test piece, and then a fatigue test is carried out on the pre-corroded test piece so as to investigate the corrosion fatigue performance of a material or a component. However, in the fields of civil engineering, marine engineering, mechanical engineering, structures, components and materials tend to be subjected to both corrosive and fatigue effects. If the fatigue loading mode after pre-corrosion is still adopted, namely the corrosion and the fatigue are independently realized in two steps, the following problems exist:
1) the long-term interaction of corrosion and fatigue cannot be considered. In fact, fatigue can reduce the bonding degree of the rust layer and the substrate, and accelerate the erosion to develop deeply into the material; the effective cross section area is weakened by the corrosion pits formed by the corrosion in the matrix, the stress concentration and average stress are increased, and then the formation and the propagation of fatigue cracks are accelerated. The deterioration caused by corrosion and fatigue develops synchronously, and the degradation is coupled with each other and circulates, and the influence on the weathering steel is far beyond the simple superposition of the two effects of corrosion and fatigue.
2) The problem of continued corrosion during fatigue loading cannot be considered. During actual service, the application of fatigue loads may cause cracking, peeling and crack propagation of the original rust layer, thereby causing further corrosion of the substrate. The original independent corrosion and fatigue loading can not truly simulate the situation, and if the data obtained by the original test is used for evaluating the actual engineering, the greater potential safety hazard is brought.
3) The loading mechanism cannot be set reasonably. Salt spray corrosion is a laboratory accelerated corrosion mode, and a fatigue test is a laboratory simplified reciprocating load mode, and the salt spray corrosion and the fatigue test respectively have respective time axes. The time axis of accelerated corrosion is related to the pre-corrosion time and the time axis of fatigue loading is related to the loading frequency. How to coordinate the two time axes and how to scientifically match and set the corrosion time and the fatigue loading frequency is not solved.
The salt spray corrosion and fatigue load joint coupling effect test system provided by the invention can realize the simultaneous effect of corrosion and fatigue of the metal standard test piece under the condition that the fatigue testing machine is not disturbed by salt spray, avoids the complexity of the corrosion test and the fatigue test in the conversion process and errors caused to the test result, improves the correlation between the corrosion test and the actual corrosion of the material, and shortens the test period. The fatigue behavior of the material in a corrosive environment is reflected more truly, and the safety problem caused by independent corrosion and fatigue tests is solved.
Disclosure of Invention
The invention aims to solve the problems and provides a test system for joint coupling of salt spray corrosion and fatigue load.
The purpose of the invention is realized as follows: a test system for joint coupling effect of salt spray corrosion and fatigue load comprises a fatigue test system, a corrosion test system and a computer, wherein the fatigue test system comprises a fatigue testing machine and a test piece; the corrosion test system comprises a salt spray test box, a blower, a corrosion fatigue test box, a ventilation pipe, a spraying pipe, a fog discharging pipe, a rubber sleeve, a protection plate and a collection box; the computer controls the work and the intermittent time of the salt spray test box and the blower; fatigue testing machine top is provided with the corrosion fatigue test case, be provided with the test piece in the middle of the corrosion fatigue test case, the upper end and the lower extreme of test piece all pass the corrosion fatigue test case and fix through fatigue testing machine's anchor clamps, the test piece is provided with the rubber sleeve with the junction of corrosion fatigue test case, one side that both ends are close to the solid fixed cylinder about the test piece is provided with the guard plate, both sides all are provided with the collection box about the guard plate top of test piece lower extreme, test piece one side is provided with the spray pipe, the spray pipe other end passes the corrosion fatigue test case and is connected to the salt fog test case, the left and right sides of test piece all is provided with the ventilation pipe, the other end of ventilation pipe passes the.
Furthermore, a support is arranged between the lower part of the corrosion fatigue test box and the upper part of the fatigue testing machine.
Furthermore, the surfaces of the protection plates, which are close to one end of the fixed cylinder, are provided with drying agents.
The invention has the beneficial effects that:
1. the test is ensured to be carried out, and meanwhile, fatigue loading and other equipment are protected from corrosion attack.
2. The problem of partial danger of corrosion and fatigue independent action test data is solved.
3. Long-term interaction and coupling effects of corrosion and fatigue are considered.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of the operation of the salt spray corrosion and fatigue test co-coupling test system of the present invention.
Fig. 2 is a front elevation view of the present invention.
Fig. 3 is a side elevational view of the present invention.
FIG. 4 is a section a-a of the present invention.
FIG. 5 is a b-b section of the present invention.
FIG. 6 is a c-c section of the present invention.
FIG. 7 is a detail of a test piece of the present invention.
Fig. 8 is a detailed view of the collection cassette of the present invention.
Fig. 9 is a detailed view of the shield of the present invention.
FIG. 10 is a large drawing of a test piece of the present invention.
Wherein: 1-corrosion fatigue test chamber; 2-a ventilation pipe; 3-a spray pipe; 4-a fog discharging pipe; 5-support; 6-test piece; 7-rubber sleeve; 8-protective plate; 9-a collection box; 10-salt fog box; 11-a blower; 12-corrosion test system; 13-fatigue test system; 14-a computer; 15-fatigue testing machine; 16-desiccant.
Detailed Description
The testing device is provided with a fatigue testing system, a corrosion testing system and a control center system. The functions of the respective systems are as follows;
(1) the fatigue testing system is composed of a fatigue testing machine and a test piece, and the diagram 1 is formed. A test piece with a proper size is machined on the material, and the thickness T of the plate is 4-12 mm as shown in figure 10. The large sample of the test piece can be seen in fig. 4, and is mounted on a fatigue testing machine, and after the mounting is completed, a fatigue load is applied to the test piece.
(2) Corrosion test system: the salt spray test box, the blower and the fog discharge channel form a figure 1. After the test piece is assembled, the salt spray test box is started by controlling the central system, the generated salt spray enters the spray pipe, the collision head is directly aligned to the test piece to corrode the test piece, and the salt spray in the test box is discharged through the spray pipe (see figures 3 and 4) (dry-wet alternative corrosion method, namely, the corrosion test system performs corrosion-drying-corrosion-drying repeated operation on the test piece in a certain period).
(3) A computer: is the most central position of the whole test, is the brain of the whole device, controls (1 fatigue load size and fatigue load frequency of the fatigue test, (2 corrosion time, test temperature and dry-wet alternative corrosion period of the corrosion test, (3 stress state of a test piece, start and intermittent working time of a blower controlled by a computer, the start and intermittent working time of the salt spray testing machine is controlled by the self-contained program of the salt spray testing machine, the working time of the salt spray testing box is ensured to be equal to the intermittent time of the blower, the intermittent time of the salt spray testing box is equal to the working time of the blower, the system can realize the alternate implementation of automatic salt spray spraying and blowing drying, and parameters such as the magnitude of fatigue load, the frequency corrosion time of the fatigue load, the test temperature and the like are selected according to GB15248-2008 metal material axial constant-amplitude low-cycle fatigue test method.
Corrosion test system: the salt spray test box is connected with the corrosion fatigue test box through the spray pipe, and the interface is aligned with the test section of the wide surface of the test piece, which is shown in a-a. The electric blowers are connected to the left and right sides of the corrosion fatigue test chamber through air ducts, and the interfaces must also be aligned with the test sections of the test piece, see fig. c-c. The corrosion fatigue test chamber is prevented from being arranged on the fatigue testing machine through a support. The upper and lower openings of the corrosion fatigue test box (the aperture must be larger than the long side dimension of the test piece by 1-2 cm). So that the test piece can be conveniently installed, and after the test piece is installed, the test piece and the hole are sealed through the rubber sleeve.
Fatigue test system: manufacturing a standard test piece, referring to fig. 4, fixing the test piece on a fatigue testing machine, wherein the clamping length of the fatigue testing machine is required to meet the requirements of GB15248-2008 metal material axial constant-amplitude low-cycle fatigue testing method, and is more than or equal to 8 times of the thickness of the test piece. After the test piece is installed, the collecting box is placed on the protective steel plate at the lower end of the test piece, and a layer of drying agent is coated on the protective steel plate at the upper end, see fig. 4, so that salt mist which possibly diffuses is absorbed, and the corrosion of the salt mist to a test machine is prevented.
A computer: and the computer is respectively connected with the fatigue testing machine, the salt spray testing box and the electric blower and controls the loading and spraying time, the salt spray temperature and the drying time of the fatigue test. The spraying time, the salt spray temperature and the like are selected according to the corrosion test-salt spray test in artificial environment (ISO 9227-2017), and the drying time is selected according to the dry-wet cycle time proportion of the simulated environment.
The fatigue testing machine is used for fixing the test piece and applying fatigue load to the test piece.
Salt spray test box: salt spray is produced, and the salt spray is conveyed to a test piece through a spray pipe.
Corrosion fatigue test chamber: and the sealing function is used for preventing the generated salt mist from leaking to corrode the fatigue testing machine and keeping the constant corrosion environment temperature.
A support: and (5) fixing the corrosion fatigue test box.
Electric hair dryer: dry test pieces (in dry-wet alternation test).
A sewage draining pipe: discharging salt fog in the corrosion fatigue test chamber.
Rubber sleeve: and (5) a protective effect. And the salt mist in the test box is prevented from being discharged through the test piece hole, so that the fatigue testing machine is prevented from being corroded.
A collection box: the salt mist in the collection test box forms a strand flow direction tester on the test piece due to the action of gravity, and is protected again.
Protective steel plate: the discharged salt fog is blocked by the steel plate, and the collection box is finally protected and supported. And the protection plate is adhered to the standard test piece through structural adhesive.
The fatigue testing machine adopts an MTS-landmark fatigue testing machine, the salt spray test box adopts an YWX/F series salt spray accelerated corrosion test box, and the air blower adopts a dry air blower with 75kg, 120mm of outer diameter, 69mm of inner diameter and 100mm of center hole distance.
When the test is started, the salt spray test box is operated to carry out intermittent accelerated corrosion, and when the environment of the corrosion box reaches the environmental parameters specified in the salt spray test (ISO 9227-2017) in the artificial environment, the fatigue testing machine is controlled by the computer to apply reciprocating fatigue load. The accelerated corrosion test piece and the intermittent time are set through the salt spray corrosion box, and the working time and the intermittent time of the electric blower are controlled through a computer. Such as: the salt spray test box is accelerated to corrode for 50 minutes, the interval is 10 minutes, meanwhile, the salt spray test box is accelerated to corrode for 50 minutes, the interval of the electric blower is set, the salt spray test box is 10 minutes, and the electric blower works to and fro until the test piece is damaged and broken.
The technical scheme is as follows:
1. the salt spray test box is combined with the fatigue loading system, and corresponding protection measures are adopted to avoid the corrosion of the salt spray to the fatigue testing machine.
2. And a drying measure is added, so that the test system can realize the functions of continuous salt spray and fatigue, and can also realize the functions of alternate corrosion and fatigue of dry and wet cycles.
3. The external corrosion fatigue test box is adopted, the modification damage to the original salt spray testing machine is small, and the salt spray testing machine can be separated out to continue the salt spray test after the test is finished.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (3)
1. The utility model provides a salt spray corrosion and fatigue load joint coupling effect's test system which characterized in that: the device comprises a fatigue test system, a corrosion test system and a computer, wherein the fatigue test system comprises a fatigue tester and a test piece; the corrosion test system comprises a salt spray test box, a blower, a corrosion fatigue test box, a ventilation pipe, a spraying pipe, a fog discharging pipe, a rubber sleeve, a protection plate and a collection box; the computer controls the work and the intermittent time of the salt spray test box and the blower; fatigue testing machine top is provided with the corrosion fatigue test case, be provided with the test piece in the middle of the corrosion fatigue test case, the upper end and the lower extreme of test piece all pass the corrosion fatigue test case and fix through fatigue testing machine's anchor clamps, the test piece is provided with the rubber sleeve with the junction of corrosion fatigue test case, one side that both ends are close to the solid fixed cylinder about the test piece is provided with the guard plate, both sides all are provided with the collection box about the guard plate top of test piece lower extreme, test piece one side is provided with the spray pipe, the spray pipe other end passes the corrosion fatigue test case and is connected to the salt fog test case, the left and right sides of test piece all is provided with the ventilation pipe, the other end of ventilation pipe passes the.
2. The salt spray corrosion and fatigue load co-coupling test system of claim 1, wherein: a support is arranged between the lower part of the corrosion fatigue test box and the upper part of the fatigue testing machine.
3. The salt spray corrosion and fatigue load co-coupling test system of claim 1, wherein: the surfaces of the protection plates, which are close to one end of the fixed cylinder, are provided with drying agents.
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| CN202110108749.8A CN112763404A (en) | 2021-01-27 | 2021-01-27 | Test system for joint coupling effect of salt spray corrosion and fatigue load |
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| CN202110108749.8A CN112763404A (en) | 2021-01-27 | 2021-01-27 | Test system for joint coupling effect of salt spray corrosion and fatigue load |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588534A (en) * | 2021-08-10 | 2021-11-02 | 广西交科集团有限公司 | Device and method for simulating component corrosion and fatigue coupling effect |
| CN113720590A (en) * | 2021-07-30 | 2021-11-30 | 中国航发沈阳发动机研究所 | Fretting fatigue simulation test device and method |
| CN114112749A (en) * | 2021-11-24 | 2022-03-01 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN115201026A (en) * | 2022-07-14 | 2022-10-18 | 国家高速列车青岛技术创新中心 | High-temperature salt spray corrosion fatigue crack propagation rate test system |
| CN115479836A (en) * | 2022-09-13 | 2022-12-16 | 中国第一汽车股份有限公司 | Salt spray corrosion test evaluation method, system, equipment and storage medium |
| CN117538246A (en) * | 2023-12-24 | 2024-02-09 | 中国兵器装备集团西南技术工程研究所 | Salt fog-fatigue load working condition coupling test device |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200972450Y (en) * | 2006-10-26 | 2007-11-07 | 中国船舶重工集团公司第七二五研究所 | Salt air corrosion faigue test device |
| CN201259481Y (en) * | 2008-08-27 | 2009-06-17 | 中国科学院金属研究所 | Apparatus for implementing dry-wet alternated accelerated corrosion in loading process |
| CN203055091U (en) * | 2013-02-05 | 2013-07-10 | 太原市精微测控技术有限公司 | Air pressure type electronic information equipment fault alarm device |
| WO2015135230A1 (en) * | 2014-03-12 | 2015-09-17 | 深圳市华星光电技术有限公司 | Etching solution concentration measurement apparatus and method |
| CN104931407A (en) * | 2015-06-10 | 2015-09-23 | 合肥通用机械研究院 | Multi-axis salt spray corrosion fatigue crack propagation test system |
| CN208486674U (en) * | 2018-05-07 | 2019-02-12 | 深圳市索斐亚智能有限公司 | A kind of circuit board waterproof, moisture-proof, anti salt spray corrosion safe electronic lock |
| CN110333155A (en) * | 2019-05-23 | 2019-10-15 | 浙江大学 | Orthotropic Steel Bridge Deck welding node corrosion fatigue test method and device thereof |
| CN211421596U (en) * | 2019-12-18 | 2020-09-04 | 云南超越建设工程有限公司 | Steel construction anti-wind post |
| CN111855552A (en) * | 2020-08-05 | 2020-10-30 | 南京钢铁股份有限公司 | Corrosion fatigue test device and method for simulating marine atmospheric environment |
| CN111879687A (en) * | 2020-06-05 | 2020-11-03 | 中国民航大学 | Semi-open type in-situ salt spray corrosion device suitable for optical measurement mechanics |
| CN211856306U (en) * | 2020-04-20 | 2020-11-03 | 合肥市市政设计研究总院有限公司 | Freeze-thaw, salt corrosion and dry-wet coupling effect simulation test device |
-
2021
- 2021-01-27 CN CN202110108749.8A patent/CN112763404A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200972450Y (en) * | 2006-10-26 | 2007-11-07 | 中国船舶重工集团公司第七二五研究所 | Salt air corrosion faigue test device |
| CN201259481Y (en) * | 2008-08-27 | 2009-06-17 | 中国科学院金属研究所 | Apparatus for implementing dry-wet alternated accelerated corrosion in loading process |
| CN203055091U (en) * | 2013-02-05 | 2013-07-10 | 太原市精微测控技术有限公司 | Air pressure type electronic information equipment fault alarm device |
| WO2015135230A1 (en) * | 2014-03-12 | 2015-09-17 | 深圳市华星光电技术有限公司 | Etching solution concentration measurement apparatus and method |
| CN104931407A (en) * | 2015-06-10 | 2015-09-23 | 合肥通用机械研究院 | Multi-axis salt spray corrosion fatigue crack propagation test system |
| CN208486674U (en) * | 2018-05-07 | 2019-02-12 | 深圳市索斐亚智能有限公司 | A kind of circuit board waterproof, moisture-proof, anti salt spray corrosion safe electronic lock |
| CN110333155A (en) * | 2019-05-23 | 2019-10-15 | 浙江大学 | Orthotropic Steel Bridge Deck welding node corrosion fatigue test method and device thereof |
| CN211421596U (en) * | 2019-12-18 | 2020-09-04 | 云南超越建设工程有限公司 | Steel construction anti-wind post |
| CN211856306U (en) * | 2020-04-20 | 2020-11-03 | 合肥市市政设计研究总院有限公司 | Freeze-thaw, salt corrosion and dry-wet coupling effect simulation test device |
| CN111879687A (en) * | 2020-06-05 | 2020-11-03 | 中国民航大学 | Semi-open type in-situ salt spray corrosion device suitable for optical measurement mechanics |
| CN111855552A (en) * | 2020-08-05 | 2020-10-30 | 南京钢铁股份有限公司 | Corrosion fatigue test device and method for simulating marine atmospheric environment |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720590A (en) * | 2021-07-30 | 2021-11-30 | 中国航发沈阳发动机研究所 | Fretting fatigue simulation test device and method |
| CN113588534A (en) * | 2021-08-10 | 2021-11-02 | 广西交科集团有限公司 | Device and method for simulating component corrosion and fatigue coupling effect |
| CN114112749A (en) * | 2021-11-24 | 2022-03-01 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN114112749B (en) * | 2021-11-24 | 2023-08-08 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN115201026A (en) * | 2022-07-14 | 2022-10-18 | 国家高速列车青岛技术创新中心 | High-temperature salt spray corrosion fatigue crack propagation rate test system |
| CN115201026B (en) * | 2022-07-14 | 2024-04-26 | 国家高速列车青岛技术创新中心 | High-temperature salt spray corrosion fatigue crack growth rate testing system |
| CN115479836A (en) * | 2022-09-13 | 2022-12-16 | 中国第一汽车股份有限公司 | Salt spray corrosion test evaluation method, system, equipment and storage medium |
| CN117538246A (en) * | 2023-12-24 | 2024-02-09 | 中国兵器装备集团西南技术工程研究所 | Salt fog-fatigue load working condition coupling test device |
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Application publication date: 20210507 |