CN101566554A - Seawater circulation system for performing corrosion fatigue test for metal materials - Google Patents
Seawater circulation system for performing corrosion fatigue test for metal materials Download PDFInfo
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Abstract
The invention relates to a seawater circulation system for performing corrosion fatigue test for metal materials, which consists of a seawater container 1, a micro-pump 2, a rubber conduit 3, a water flow control valve 4, a double-layer leakproof corrosion device 5, a sample fixed end 6, a sample surface crackle end 7, a low-cycle fatigue test sample end 8, a sample loading end 9, a conduit 10 and a filter box 11. The seawater container is inserted in the micro-pump; the rubber conduit is connected with the micro-pump and the water flow control valve and is communicated with the double-layer leakproof corrosion device; the sample fixed end, the sample surface crackle end and the low-cycle fatigue test sample end can be fixed on the double-layer leakproof corrosion device and the sample loading end is applied; the other end of the double-layer leakproof corrosion device is communicated with the filter box through the conduit; and the seawater is filtered to return to the seawater container. The low-cycle corrosion fatigue test under a mode that a cantilever is bent and loaded changes the current situation that the metal check is performed by previously using air fatigue performance data instead of seawater fatigue performance data, thereby increasing the safety, the reliability and the service life of ships and warships.
Description
Technical field
The invention belongs to the material test technical field, or rather, relate to a kind of seawater circulation system that metal material is carried out corrosion fatigue test.
Background technology
When in corrosive medium, carrying out the fatigue crack growth rate test of metal material, recommended the design diagram of employing standard M (T) sample and standard C (T) etchant solution circulation system when sample is tested among the GB/T6398-2000 " metal material fatigue crack growth rate test method ".For standard M (T) sample, only provided simple synoptic diagram in the standard, do not further specify the leakage problems that how to prevent corrosive liquid among the figure.From synoptic diagram, cyclic movement along with sample, etchant solution will leak into (testing machine that domestic a lot of units use all is expensive import equipment) on the testing machine unavoidably, at least solution can't be avoided not leaking after the sample fatigue break, not strong, inadvisable according to synoptic diagram design solution recycle system operability; For C (T) sample, the solution recycle system in the synoptic diagram just designs at horizontal testing machine, and the fatigue tester that present domestic most units use all is vertical, and it is little therefore to use for reference design sense.Do not mention all in other up-to-date torture test standard how the corrosive cycle system specifically designs and use.
Mention material selected when designing solution recycle system in the part document and made thinking, but, seldom see document and mention designing and manufacturing method as the circulation system under the non axial loading modes such as rotoflector loading, cantilever bending loading basically all at axial loading (this loading mode relatively easily designs and produces) standard sample.And, mention that seldom how to guarantee corrosive liquid non-leakage to testing machine, promptly the encapsulating method to each link of the circulation system seldom has detailed explanatory note.
In a word, do not see the relevant report that under the cantilever bending loading mode, hangs down all corrosion fatigue tests with seawater circulation system success design example as yet.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of seawater circulation system that metal material is carried out corrosion fatigue test, this system integrate the power source that drives seawater and circulate, control inflow size water-control device, guarantee that the test button crackle is in seawater circulating device in the seawater all the time, guarantees the seawater clean filtration unit of cleaning etc. all the time, can guarantee that test button working portion crackle is in the nature seawater that simulation flows all the time.Therefore, the successful design of this system, can guarantee that the naval vessel carries out low all corrosion fatigue tests under this special loading mode of cantilever bending with metal material in seawater (also can enough other as etchant solutions such as river, salt solution), changed the present situation of carrying out ship design and checking fatigue lifetime with fatigue behaviour data in the fatigue behaviour data replacement seawater of marine material in the air in the past, for safe, reliable, the service life that increases the naval vessel provides guarantee.
For achieving the above object, the present invention adopts following technical scheme:
The described seawater circulation system that metal material is carried out corrosion fatigue test, its method for designing is that the double-deck leakproof corrosion that provides the power source micro pump that drives seawater and circulate, the water flow control valve of controlling the inflow size, assurance sample crackle to be in the seawater all the time and be convenient to clear view has been provided, guarantee the seawater totally Rose Box of cleaning and plurality of rubber conduit etc. all the time, each link is not only relatively independent but also get in touch each other, has constituted to guarantee that sample working portion crackle is in the mobile nature seawater of simulation all the time.
The described seawater circulation system that metal material is carried out corrosion fatigue test, mainly by sea container, micro pump, rubber catheter, water flow control valve, double-deck leakproof corrosion device, the sample stiff end, the specimen surface crack tip, low cycle fatigue test sample end, the sample loading end, conduit, Rose Box constitutes, wherein sea container inserts micro pump, rubber catheter connect micro pump and water flow control valve and with double-deck leakproof corrosion device UNICOM, fixing sample stiff end on double-deck leakproof corrosion device, the specimen surface crack tip, low cycle fatigue test sample end and enforcement sample loading end, the other end of double-deck leakproof corrosion device is back to sea container after filtering again by conduit and Rose Box UNICOM.
The described seawater circulation system that metal material is carried out corrosion fatigue test, its double-deck leakproof corrosion device is by inner box, outer box, outer box apopore, add long spiro nail, the inner box apopore, the sample through hole, the inner box blasthole, outer box rubber catheter passes through mouth, rubber, poly (methyl methacrylate) plate constitutes, its China and foreign countries' box is rectangle, outer box apopore and outer box rubber catheter are set on it pass through mouth, lay on the box outside and be rectangle but the inner box littler than outer box, the front of inner box is made of two poly (methyl methacrylate) plate therebetween rubber blankets, and the sample through hole is set, the through hole of rubber blanket is less than the through hole of organic glass; At two ends, inner box side, set out water hole and blasthole respectively at two ends, inner box side, and blasthole is higher than apopore by the lengthening screw retention.
Because adopt aforesaid technical scheme, the present invention has following superiority:
One, seawater circulation system of the present invention can drive seawater and do loop cycle, as required controlled water flow amount size; Can guarantee that circulating seawer soaks the sample crackle wherein all the time and don't can be with organic glass and rubber blanket double-deck leakproof, opening, integral type corrosion device designed in conjunction because of leaking corrosion test equipment, be convenient to reading microscope and observe the spread scenarios of crackle at any time, simultaneously in process of the test, along with sample is done periodically to pump significantly, rubber blanket has born the whole acting forces that significantly move up and down box body is wrecked because of sample.Solved and often adopted the global design method traditionally and make sample in the reciprocal difficult problem of fragile corrosion device in service.
Two, the backwater Rose Box can the elimination corrosion product, guarantees that seawater totally cleans, and avoids corrosion product to enter crack tip and influences observation to crack extending length.
Three, the whole seawater circulation system that is used under the cantilever bending loading mode can provide the marine environment that a simulated seawater flows, and can satisfy the naval vessel carries out corrosion fatigue test under this kind loading mode with metal material needs.
Description of drawings
Fig. 1 is a seawater circulation system synoptic diagram of the present invention;
Fig. 2 is the double-deck leakproof corrosion device of a present invention synoptic diagram;
Among the above-mentioned figure: the 1-sea container; The 2-micro pump; The 3-rubber catheter; The 4-water flow control valve; The double-deck leakproof corrosion device of 5-; 6-sample stiff end; 7-specimen surface crack tip; 8-low cycle fatigue test sample end; 9-sample loading end; The 10-conduit; The 11-Rose Box; The 51-inner box; The outer box of 52-; The outer box apopore of 53-; 54-adds long spiro nail; The high apopore of 55-inner box; 56-sample through hole; The 57-inner box hangs down blasthole; The outer box rubber catheter of 58-passes through mouth; 59-rubber; The 510-poly (methyl methacrylate) plate.
Embodiment
In conjunction with Fig. 1, provide the power source micro pump that drives seawater and circulate, control inflow size water flow control valve, guarantee the sample crackle be in the seawater all the time and be convenient to clear view double-deck leakproof corrosion device, guarantee the seawater totally Rose Box of cleaning and plurality of rubber conduit etc. all the time, each link is not only relatively independent but also get in touch each other, has constituted to guarantee that sample working portion crackle is in the seawater circulation system of the mobile nature seawater of simulation all the time.
When carrying out axial corrosion fatigue test in the past, usually design an isolated corrosion device, carrying out along with test, owing to constantly entering into corrosive liquid, corrosion product make the sample crack length can't clear view, even take certain measure that corrosive liquid is circulated, entery and delivery port also often not of uniform size because of Design and Machining in corrosion device, that quantity does not wait, the liquid level that is not easy to keep certain height finally makes test normally carry out.In light of this situation, can be at water inlet of corrosion device on Design and Machining and a water delivering orifice, water flow control valve directly is installed on the water route, reach the purpose of controlled water flow amount size, to keep the liquid level of certain altitude in the corrosion device, both guaranteed that the sample crackle soaked wherein, be unlikely to again because of leakage corrosion test equipment? consider this special loading mode of cantilever bending, the amplitude that sample is up and down reciprocatingly swung is bigger, by mentality of designing in the past, be designed to individual layer, the corrosion device of separate type will be not easy to guarantee that seawater does not leak, in process of the test, also be difficult to guarantee corrosion device not the sample of passive movement damage by pressure, therefore, can consider corrosion device is designed to double-layer integrally, for making things convenient for the spread scenarios of clear view crackle, also need corrosion device is designed to open so that microscopical Direct observation.Based on above-mentioned consideration, corrosion device is designed to have the characteristics of double-deck leakproof, opening, one.For can clear view crack propagation situation, need in the loop, filter out the corrosion product of metal material in seawater, this just needs to increase Rose Box.Comprehensive above the analysis formed the seawater circulation system mentality of designing that is used for low all corrosion fatigue tests.
In the design in the past, often adopt the liquid level of certain altitude in the method maintenance corrosion device that entery and delivery port is not of uniform size or quantity does not wait, do the balance that usually is difficult to guarantee into and out of the water yield like this, and need repetition test to grope the seeking balance point, grope in the process in test repeatedly, corrosive liquid can not leak on testing machine chuck, fixture block and the table top unavoidably, the anticorrosion problem of testing machine is more outstanding, if adopt suitable water flow control valve, at any time control inflow as required, then the problems referred to above can be avoided.In addition, because the cycle of torture test is often very long, in entire test; seawater usually can the corrosion test material, forms corrosion product, and corrosion product accumulates in the crack tip of continuous expansion; both can influence the expansion of crackle, be unfavorable for the observation of crack propagation situation again.Therefore, it also is necessary increasing Rose Box in the circulation system.
In conjunction with Fig. 2, double-deck leakproof corrosion device is the key link of system of the present invention.This device adopt different-thickness poly (methyl methacrylate) plate and individual adhesive, rubber, add material such as long spiro nail, glazing compound and form, have low blasthole and high apopore, double-deck leakproof, opening, integral type feature.Adopting transparent organic glass and the individual adhesive base material that designs and produces as corrosion device, is to be convenient to processing on the one hand, is to observe the turnover flow of seawater and the extension length of surface crack at any time on the other hand.Sample run through respectively add pliable and tough, the easily deformable rubber of last layer (can determine the rubber amount that cuts off) in the middle of two baffle plates in front and back of process according to the size of sample cross, to guarantee four surfaces of tight obedient sample, increase sealing, simultaneously, seal with glazing compound the surfaces externally and internally contact position of sample and rubber, guarantees that as far as possible seawater does not leak from the contact position of sample and corrosion device.Even so, even seawater leaks out from the contact position of sample and corrosion device inner box, flow to the outer box of corrosion device, the apopore from outer box flows back to sea container again, also can not leak to corrosion test machine grip holder, fixture block and table top on the testing machine.Being designed to open is the spread scenarios that can observe whole surface crack for microscope in a big way, and the characteristics of integral type can guarantee to follow sample to do up and down and be synchronized with the movement, and avoid the sample of large amplitude that it is damaged by pressure.This bilayer leakproof corrosion device can be guaranteed that circulating seawer soaks the sample crackle wherein all the time and don't can be convenient to microscope and observe the crack propagation situation at any time because of leaking corrosion test equipment, can do periodically to pump significantly with sample flexibly.
Each parts effect is as follows in the seawater circulation system of the present invention:
Among Fig. 1: sea container 1 usefulness poly (methyl methacrylate) plate designs and produces, and is used for holding the seawater that corrosion fatigue test is used.Micro pump 2 is used to provide the power that seawater is made loop cycle.Rubber catheter 3 is used for guiding seawater to enter double-deck leakproof corrosion device.Water flow control valve 4 is used for the size of controlled water flow amount.Double-deck leakproof corrosion device 5 is used for keeping the certain liquid seawater, is immersed in the seawater to guarantee the specimen surface crackle always.Carry out the force side 9 of low cycle fatigue test in the stiff end 6 of sample, the surface crack 7 of sample, the corrosion environment with sample 8, sample.The guiding seawater flows back to the conduit 10 of container.Filtration unit 11 is used for the filtered sample corrosion product, to guarantee seawater clean cleaning all the time, is convenient to observe the expansion of surface crack.
Among Fig. 2: the inner box 51 of double-deck leakproof corrosion device is mainly used to hold the seawater of certain altitude liquid level.The outer box 52 of double-deck leakproof corrosion device is used for accepting the seawater that may leak from the contact position of sample and inner box.Outer box apopore 53 is used for guiding the seawater of leakage to flow in the sea container.Add long spiro nail 54 (four) rice fixedly inner box poly (methyl methacrylate) plate and rubber blanket.Unnecessary seawater flow in the sea container after the high apopore 55 of inner box was used for guiding and keeps certain liquid.Sample through hole 56 (two) is used for fixing sample.The low blasthole 57 of inner box is passages that seawater enters inner box.Outer box rubber catheter passes through mouth 58, and rubber catheter enters and low water inlet 57 connections of inner box from this mouth.Rubber 59 is used for seal sample.Poly (methyl methacrylate) plate 510 is used for fixing rubber 59.
Seawater circulation system of the present invention has carried out crooked loading of briny environment lower cantalever and has hanged down all corrosion fatigue tests.Test frequency is 1.0Hz, and waveform is sinusoidal wave, adopts load modes control, and corresponding displacement amplitude is ± 6mm.By the voltage of indirect potential method surface measurements crackle both sides, adopt the unidirectional surface crack extension length of microscopic examination.Its test findings sees the following form;
| U/mV | a/mm | U/mV | a/mm |
| 121.42 | 27.45 | 0.00 | 0.00 |
| 123.18 | 27.60 | 1.76 | 0.15 |
| 132.15 | 28.47 | 10.73 | 1.02 |
| 132.92 | 28.57 | 11.50 | 1.12 |
| 134.71 | 28.82 | 13.29 | 1.37 |
| 136.67 | 28.92 | 15.25 | 1.47 |
| 138.58 | 29.08 | 17.16 | 1.63 |
| 141.34 | 29.23 | 19.92 | 1.78 |
| 142.84 | 29.33 | 21.42 | 1.88 |
| 145.47 | 29.51 | 24.05 | 2.06 |
| 146.77 | 29.59 | 25.35 | 2.14 |
| 147.58 | 29.66 | 26.16 | 2.21 |
| 149.10 | 29.81 | 27.68 | 2.36 |
| 150.41 | 29.91 | 28.99 | 2.46 |
| 153.55 | 30.16 | 32.13 | 2.71 |
| 155.68 | 30.25 | 34.26 | 2.80 |
| 156.35 | 30.28 | 34.93 | 2.83 |
| 157.90 | 30.44 | 36.48 | 2.99 |
In the table 1, U and U represent the increment of indirect potential method surface measurements crackle both sides voltage and voltage respectively, and a and a are respectively single side surface crack length reading and the surface crack extension length increment that arrives by microscopic examination.
Process of the test shows that the situation that seawater leaks does not take place seawater circulation system, can clearly observe the length of specimen surface crack propagation in the entire test.Test findings shows in the table 1, and the seawater circulation system that the present invention sets up can provide continual flowing seawater, has simulated real briny environment, can satisfy and carry out the needs that cantilever bending loads low all corrosion fatigue tests.
Claims (3)
1, a kind of seawater circulation system that metal material is carried out corrosion fatigue test, it is characterized in that: its method for designing is that the double-deck leakproof corrosion that provides the power source micro pump that drives seawater and circulate, the water flow control valve of controlling the inflow size, assurance sample crackle to be in the seawater all the time and be convenient to clear view has been provided, guarantee the seawater totally Rose Box of cleaning and plurality of rubber conduit etc. all the time, each link is not only relatively independent but also get in touch each other, has constituted to guarantee that sample working portion crackle is in the mobile nature seawater of simulation all the time.
2, a kind of seawater circulation system that metal material is carried out corrosion fatigue test, it is characterized in that: this system is mainly by sea container 1, micro pump 2, rubber catheter 3, water flow control valve 4, double-deck leakproof corrosion device 5, sample stiff end 6, specimen surface crack tip 7, low cycle fatigue test sample end 8, sample loading end 9, conduit 10, Rose Box 11 constitutes, wherein sea container inserts micro pump, rubber catheter connect micro pump and water flow control valve and with double-deck leakproof corrosion device UNICOM, fixing sample stiff end on double-deck leakproof corrosion device, the specimen surface crack tip, low cycle fatigue test sample end and enforcement sample loading end, the other end of double-deck leakproof corrosion device is back to sea container after filtering again by conduit and Rose Box UNICOM.
3, according to the described seawater circulation system that metal material is carried out corrosion fatigue test of claim 2, it is characterized in that: its double-deck leakproof corrosion device is by inner box 51, outer box 52, outer box apopore 53, add long spiro nail 54, inner box apopore 55, sample through hole 56, inner box blasthole 57, outer box rubber catheter passes through mouth 58, rubber 59, poly (methyl methacrylate) plate 510 constitutes, its China and foreign countries' box is rectangle, outer box apopore and outer box rubber catheter are set on it pass through mouth, lay on the box outside and be rectangle but the inner box littler than outer box, the front of inner box is made of two poly (methyl methacrylate) plate therebetween rubber blankets, and the sample through hole is set, the through hole of rubber blanket is less than the through hole of organic glass; At two ends, inner box side, set out water hole and blasthole respectively at two ends, inner box side, and blasthole is higher than apopore by the lengthening screw retention.
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| CN113484229A (en) * | 2021-06-16 | 2021-10-08 | 中核检修有限公司 | Metal corrosion state evaluation device and method under simulated marine multi-parameter condition |
| CN113484229B (en) * | 2021-06-16 | 2023-12-08 | 中核检修有限公司 | Metal corrosion state evaluation device and method under simulated ocean multi-parameter condition |
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| CN101566554B (en) | 2011-11-30 |
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