CN104792638B - A kind of device and method for being used to test metal erosion crack Propagation - Google Patents
A kind of device and method for being used to test metal erosion crack Propagation Download PDFInfo
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- CN104792638B CN104792638B CN201510125078.0A CN201510125078A CN104792638B CN 104792638 B CN104792638 B CN 104792638B CN 201510125078 A CN201510125078 A CN 201510125078A CN 104792638 B CN104792638 B CN 104792638B
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- fatigue
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- corrosive medium
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Abstract
The present invention discloses a kind of device and method for being used to test metal erosion crack Propagation, including base and corrosive medium container containing；The base lower surface is designed with fatigue tester clamping part, for fatigue tester lower chuck clamping；Base upper surface is designed with sample locking piece, is fixed for fatigue testing specimen lower end；Fatigue testing specimen upper end is clamped by fatigue experimental machine upper grip.Thus the alternate load of fatigue tester loading can pass to sample by fatigue tester clamping part.The corrosive medium container containing is tubular structure, and round table surface upper surface in the base is fixedly mounted in bottom；Sample locking piece in base is located in corrosive medium container containing.Tested according to the testing fatigue parameter of setting, until the active section of fatigue testing specimen is broken；During by microscope carry out shooting record crackle Initiation And Propagation fracture process.Advantages of the present invention is：Realize under static condition, metal material Corrosion Fatigue Properties in corrosive medium are tested.
Description
Technical field
The invention belongs to marine metal structural member corrosion fatigue crack damage check field, is a kind of be applicable specifically
The dress of test metal erosion crack Propagation during corrosion fatigue problem occurs when structural member peculiar to vessel is on active service in marine environment
Put and method.
Background technology
During marine metal structural member is on active service, in life cycle management, all in the state of water immersion, on the one hand meet with
Corroded by seawater corrosion medium, on the one hand bear periodic stress loading, fatigue corrosion fracture failure occurs.Corrosion fatigue
It is one kind of stress corrosion, metal defect caused by corrosion can be used as formation of crack and then Crack Extension occurs until fracture failure.
FATIGUE FRACTURE PROBLEMS when marine metal structural member uses under corrosive environment has become research emphasis, and has carried out in succession big
The experimental and theoretical study work of amount.Research sample bears continual fatigue loading situation, key issue under corrosive environment
It is to solve environmental corrosion device, the design for corrosion testing apparatus, People's Republic of China (PRC) GJB GJB1997-
Provided in 94, environmental cabinet and its auxiliary equipment should use corrosion-resistant material, be not allow for the seepage of medium.Tried on corrosion fatigue
The shape and size of sample, have also been made detailed regulation.
The crack detection of sample is to study the emphasis of corrosion fatigue, crack growth rate and sample fatigue life direct phase
Close, GB/T6398-2000《Fatigue Crack Growth Rate of Metallic Materials test method》In describe fatigue crack length in detail
Various measuring methods, including the assay method of flexibility method, potentiometry etc. and crack growth rate, these methods are all by one
Fixed physical basis, are calculated by formula, and the value of indirect gain fatigue crack length, this is resulted between measured value and actual value
Error to a certain extent be present., can more real reaction wood if can be by directly observing, measuring fatigue crack length value
The crack Propagation situation of materials and parts.
The content of the invention
For simulating the corrosion fatigue problem occurred when structural member peculiar to vessel is on active service in marine environment, the present invention devises one
Kind corrosive environment device carries out corrosion fatigue test, and uses long range operating microscope as servicing unit, measurement sample fatigue
The length of crackle, and calculate its crack growth rate.
A kind of device for being used to test metal erosion crack Propagation of the present invention, including base are contained with corrosive medium and held
Device.The base lower surface is designed with fatigue tester clamping part, the clamping for fatigue tester lower chuck；Base upper surface
Design and sample locking piece, the fixation for fatigue testing specimen lower end；The upper end of fatigue testing specimen is pressed from both sides by fatigue experimental machine upper grip
Hold.The corrosive medium container containing is tubular structure, and round table surface upper surface in the base is fixedly mounted in bottom；In base
Sample locking piece is located in corrosive medium container containing.
A kind of described method of testing for being used to test the device of metal erosion crack Propagation, it is characterised in that：
Step 1：Determine testing fatigue parameter；
Step 2：Remove fatigue testing specimen surface impurity；
Step 3：Ensure that fatigue testing specimen surface is smooth；Ensure that seepage does not occur for corrosive medium container containing simultaneously.
Step 4：The fatigue tester clamping part of base is clamped by fatigue tester lower chuck and locked；
Step 5：Fatigue testing specimen one end is arranged on the specimen clamping part of base, the other end on fatigue experimental machine by pressing from both sides
Head clamping locks；Corrosive medium then is added in corrosive medium container containing, the active section for not having fatigue testing specimen；
Step 6：Microscope is set up, makes the active section of microscope alignment lenses fatigue testing specimen；
Step 7：The testing fatigue parameter determined in fatigue tester in setting steps 1, starts to test；
Step 8：Follow-on test to predetermined cycle-index, pause experiment, microscope is taken pictures, continues to test；
Step 9：Repeat step 8, until the active section of fatigue testing specimen is broken；
Step 10：Germinating-extension-fracture process of photo record crackle according to captured by microscope, according to predetermined
Cycle-index N and crackle increment Δ a, it is known that after fatigue testing specimen crack initiation, crack growth rate da/dN change feelings
Condition.
The advantage of the invention is that：
1st, the present invention is used for the device and method for testing metal erosion crack Propagation, realizes under static condition, gold
Belong to the measurement of material Corrosion Fatigue Properties in corrosive medium；
2nd, the present invention is used for the device for testing metal erosion crack Propagation, is designed with transparent window, can conveniently observe
Test the state of overall process；
3rd, under the microscopical auxiliary of long reach, the present invention is used for the device for testing metal erosion crack Propagation
And method, there are great advantage, such as centre burst corrosion fatigue in terms of the spreading rate of test metal material precrack
Experiment and edge crack corrosion fatigue test；
4th, the present invention is used to test in the device of metal erosion crack Propagation, and base uses integrated design, can keep away
Exempt from stress concentration phenomenon, the service life of extension fixture；
5th, the present invention is used to test in the device of metal erosion crack Propagation, and the design of sheet metal can avoid testing
Fatigue testing specimen slides in journey, while is also convenient for taking for sample.
Brief description of the drawings
Fig. 1 is the device overall structure diagram that the present invention is used to test metal erosion crack Propagation；
Fig. 2 is the device center base structural representation that the present invention is used to test metal erosion crack Propagation；
Fig. 3 is sheet metal mounting means schematic diagram in device of the present invention for testing metal erosion crack Propagation；
Fig. 4 is sample keeper motion limitation signal in device of the present invention for testing metal erosion crack Propagation
Figure；
Fig. 5 is that corrosive medium container containing window is set in device of the present invention for testing metal erosion crack Propagation
Count position view；
In figure：
1- base 2- sample keeper 3- corrosive medium container containings
4- fatigue testing specimen 5- window 101- round table surfaces
102- fatigue tester clamping part 103- sample locking piece 104- through holes
105- screw 106- sheet metal 107- grooves
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
The present invention is used for the device for testing metal erosion crack Propagation, including base 1, sample keeper 2 and corrosion
Medium container containing 3, as shown in Figure 1.
The base 1 is shaped by carrying out integration to corrosion resistant 316L stainless steels cylinder, integration processing
It can avoid during testing because seepage failure occurs in stress concentration.Base 1 has round table surface 101, fatigue tester clamping
Part 102, sample locking piece 103, as shown in Figure 2.
Wherein, fatigue tester clamping part is arranged at the lower surface center of round table surface 101, under fatigue tester
The clamping of chuck, and after fatigue tester clamping, round table surface 101 must be horizontal.Sample locking piece 103 is arranged at
The upper surface of round table surface 101, is two clamping faces being parallel to each other, and the gap between two clamping faces is used for inserting the one of sample
End.The symmetrical position in two clamping faces is provided with through hole 104, thus can be opened up in the one end of fatigue testing specimen 4 and through hole on clamping face
The equal mounting hole of 104 diameters, the gap that fatigue testing specimen 4 is inserted between two clamping faces, makes the mounting hole on fatigue testing specimen 4
With the positional symmetry of through hole 104 on two clamping faces, then filled by the external diameter keeper 2 equal with through-hole diameter through two
After through hole 104 between folder face, realize that fatigue testing specimen 4 positions on base 1.The other end of fatigue testing specimen 4 passes through fatigue experimental machine
Upper grip clamps, and then realizes the clamping and locking of fatigue testing specimen 4.Pass through said structure, the alternating download of fatigue tester loading
Lotus can pass to sample by fatigue tester clamping part 102.
In order to ensure fatigue tester, keeper 2 deviates from the through hole 104 on clamping face in loading procedure, causes tired examination
Sample slides, and the present invention is in two clamping faces on the lateral surface in any one clamping face, positioned at 104 liang of side positions of through hole, with logical
The Central Symmetry of hole 104 offers two blind holes, screw 105 is coaxially fixedly mounted in each blind hole, as shown in Figure 3；Meanwhile one
Sheet metal 106 is cased with individual screw 105, sheet metal 106 can freely rotate around screw axis；Sheet metal 106 is in the axial direction of screw 105
On must be moved through screw 105 nut limitation.The groove 107 of insertion side is offered at the upper side edge of sheet metal 106, it is recessed
The width of groove 107 and screw 105 diameter is equal；The screw 105 of order installation sheet metal 106 is screw A, and another screw 105 is
Screw B, then need to ensure that rotating sheet metal 106 can coordinate screw B screw rod and groove 107, in groove 107, meanwhile, gold
Category piece 106 just blocks the through hole 104 on clamping face, as shown in Figure 4.Thus, when the clamping of fatigue testing specimen 4 finishes, put down
Sheet metal 106, you can the axial movement of limitation sample keeper 2, it is ensured that testing machine occurs fatigue testing specimen 4 in loading procedure and slided
The phenomenon fallen.
The corrosive medium container containing 3 is tubular structure, equally uses 316L stainless steels.Consider for economic benefit,
Corrosive medium container containing 3 is welded in processing by circumferential 4 pieces of 316L stainless steel materials.The bottom of corrosive medium container containing 3
End is arranged on the upper surface of round table surface 101 in base 1, is welded and fixed between circumference and the upper surface of round table surface 101.In base 1
Sample locking piece 103 is located in corrosive medium container containing 3, and then fatigue testing specimen 4 also is located at corrosive medium container containing 3
It is interior.It is used for containing corrosive medium in corrosive medium container containing 3, and then makes the device of metal erosion crack Propagation of the present invention
Realize the corrosion fatigue test in Seawater.The Crack Extension situation of the active section of fatigue testing specimen 4 is observed in the present invention for convenience,
On the side of corrosive medium container containing 3, window 5 is also provided with positioned at fatigue testing specimen work fragment position, window 5 is using transparent organic
Glass is covered and sealed with glass cement, as shown in Figure 5.
For the above-mentioned device for being used to test metal erosion crack Propagation, the present invention is also proposed in a kind of Seawater
Corrosion fatigue method of testing, rectangular cross section sample is made according to GJB1997-94 in fatigue testing specimen, specific size design according to
National military standard and corrosive environment device determine, and determine the salt angle value of corrosive medium (seawater), while micro- using working over long distances
Mirror comprises the following steps that for servicing unit：
Step 1：Determine testing fatigue parameter, including stress ratio, maximum stress, loading frequency, Loaded contact analysis, cycle-index
Deng.
Step 2：Using acetone/alcohol washes fatigue testing specimen 4, remove the impurity such as surface and oil contaminant grease.
Step 3：Check fatigue testing specimen 4, it is ensured that the surface of fatigue testing specimen 4 is smooth；Check that the present invention is used to test metal simultaneously
The device of Corrosion Fatigue Crack Propagation, it is ensured that seepage does not occur for corrosive medium container containing 3.
Step 4：The fatigue tester clamping part 102 of base 1 is clamped by fatigue tester lower chuck and locked；
Step 5：The one end of fatigue testing specimen 4 is arranged on the specimen clamping part 102 of base 1, the other end passes through fatigue experiment
Machine upper grip clamps locking；Corrosive medium is then added in corrosive medium container containing 3, the active section for not having fatigue testing specimen 4；
If the above-mentioned rigidity of fatigue testing specimen 4 is smaller, to avoid producing stress concentration between the mounting hole on fatigue testing specimen 4 and sample keeper 2,
Sample keeper 2 is set to be broken prior to the active section of fatigue testing specimen 4, therefore the tapping insertion steel bushing on fatigue testing specimen 4
To buffer stress, steel bushing is directly contacted with sample keeper 2, transmit loading stress to fatigue testing specimen 4；Meanwhile to avoid corruption
The evaporation and splashing of medium are lost, therefore by two panels rubber blanket by the top closure of corrosive medium container containing 3.
Step 6：Microscope is set up, makes micro- lens head towards window 5, the active section of alignment fatigue testing specimen 4；
Step 7：The testing fatigue parameter determined in fatigue tester in setting steps 1, starts to test；
Step 8：Follow-on test to predetermined cycle-index, pause experiment, microscope is taken pictures, continues to test；
Step 9：Repeat step 8, until the active section of fatigue testing specimen 4 is broken.
Step 10：Germinating-extension-fracture process of photo record crackle according to captured by microscope, according to predetermined
Cycle-index N and crackle increment Δ a, it is known that after the crack initiation of fatigue testing specimen 4, crack growth rate da/dN change feelings
Condition.
Claims (5)
- A kind of 1. device for being used to test metal erosion crack Propagation, it is characterised in that：Contained including base and corrosive medium Packaging container；The base lower surface is designed with fatigue tester clamping part, the clamping for fatigue tester lower chuck；Base upper table Face design and sample locking piece, the fixation for fatigue testing specimen lower end；The upper end of fatigue testing specimen passes through fatigue tester upper grip Clamping；The corrosive medium container containing is tubular structure, is welded by circumferentially disposed sheet material, and bottom is welded and fixed installation Round table surface upper surface in the base；Sample locking piece in base is located in corrosive medium container containing；The sample locking piece is two clamping faces being parallel to each other, and the gap between two clamping faces is used for inserting under sample End；The symmetrical position in two clamping faces is provided with through hole, passes through through hole of the keeper through between two clamping faces, and fatigue examination After the perforate that sample lower end opens up, realize that fatigue testing specimen lower end positions on base；Any one clamping in above-mentioned two clamping face On the lateral surface in face, positioned at the side position of through hole two, mounting screw；Meanwhile it is cased with sheet metal on a screw；On the upside of sheet metal The groove of insertion side is offered at side；The screw of order installation sheet metal is screw A, and another screw is screw B, then needs to ensure to turn Dynamic sheet metal can coordinate screw B screw rod and groove, in groove, meanwhile, sheet metal is just by the through hole on clamping face Block.
- A kind of 2. device for being used to test metal erosion crack Propagation as claimed in claim 1, it is characterised in that：The bottom Seat is shaped by carrying out integration to corrosion resistant 316L stainless steels cylinder.
- 3. a kind of method of testing for being used to test the device of metal erosion crack Propagation as claimed in claim 1, it is special Sign is：Tapping insertion steel bushing on fatigue testing specimen, makes steel bushing directly be contacted with sample keeper, transmits loading stress and give Fatigue testing specimen.
- A kind of 4. device for being used to test metal erosion crack Propagation as claimed in claim 1, it is characterised in that：The corruption Lose on medium container containing side, be also provided with window positioned at fatigue testing specimen work fragment position, window is covered using transparent organic glass Cover and sealed with glass cement.
- 5. for a kind of method of testing for being used to test the device of metal erosion crack Propagation described in claim 1, it is special Sign is：Step 1：Determine testing fatigue parameter；Step 2：Remove fatigue testing specimen surface impurity；Step 3：Ensure that fatigue testing specimen surface is smooth；Ensure that seepage does not occur for corrosive medium container containing simultaneously;Step 4：The fatigue tester clamping part of base is clamped by fatigue tester lower chuck and locked；Step 5：Fatigue testing specimen one end is arranged on the specimen clamping part of base, the other end passes through fatigue tester upper grip Clamp locking；Corrosive medium then is added in corrosive medium container containing, the active section for not having fatigue testing specimen；Step 6：Microscope is set up, makes micro- lens head towards window, is directed at the active section of fatigue testing specimen；Step 7：The testing fatigue parameter determined in fatigue tester in setting steps 1, starts to test；Step 8：Follow-on test to predetermined cycle-index, pause experiment, microscope is taken pictures, continues to test；Step 9：Repeat step 8, until the active section of fatigue testing specimen is broken；Step 10：Germinating-extension-fracture process of photo record crackle according to captured by microscope, according to predetermined circulation The increment Δ a of times N and crackle, it is known that after fatigue testing specimen crack initiation, crack growth rate da/dN situation of change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510125078.0A CN104792638B (en) | 2015-03-20 | 2015-03-20 | A kind of device and method for being used to test metal erosion crack Propagation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510125078.0A CN104792638B (en) | 2015-03-20 | 2015-03-20 | A kind of device and method for being used to test metal erosion crack Propagation |
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| CN104792638A CN104792638A (en) | 2015-07-22 |
| CN104792638B true CN104792638B (en) | 2018-03-16 |
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| CN105424702A (en) * | 2015-12-10 | 2016-03-23 | 东南大学 | Method for dynamically analyzing cracking failure of carbides in high speed steels |
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| CN112577822A (en) * | 2020-12-09 | 2021-03-30 | 江苏科技大学 | Corrosion fatigue crack detection system and use method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608995A (en) * | 2008-06-20 | 2009-12-23 | 宝山钢铁股份有限公司 | The measuring method of galvanic corrosion and sample thereof under the high-stress state of welded tube weld seam |
| CN201909737U (en) * | 2010-12-07 | 2011-07-27 | 北京有色金属研究总院 | Clamping device for metal material shear fracture test |
| CN102692373A (en) * | 2012-06-14 | 2012-09-26 | 华东理工大学 | Stress corrosion sensitivity evaluation device based on small punch rod test technology |
| CN203101235U (en) * | 2012-12-28 | 2013-07-31 | 中国石油天然气集团公司 | Metal fatigue stress corrosion detection tester |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003035644A (en) * | 2001-07-23 | 2003-02-07 | Toyota Central Res & Dev Lab Inc | Method and equipment for thermal fatigue test |
| 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 |
| CN101660985B (en) * | 2008-08-27 | 2011-08-31 | 中国科学院金属研究所 | Application of equipment for implementing synchronous dry-wet alternate accelerated corrosion in loading process |
| CN102353601B (en) * | 2011-07-12 | 2013-07-31 | 中国石油大学(北京) | Erosion testing machine capable of applying pulling force |
| CN103076243A (en) * | 2012-12-07 | 2013-05-01 | 太原理工大学 | System for predicting fatigue limit of magnesium alloy member based on infrared thermal imaging, and method thereof |
| JP5776990B2 (en) * | 2013-12-12 | 2015-09-09 | 日立金属株式会社 | Corrosion fatigue damage evaluation method |
-
2015
- 2015-03-20 CN CN201510125078.0A patent/CN104792638B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608995A (en) * | 2008-06-20 | 2009-12-23 | 宝山钢铁股份有限公司 | The measuring method of galvanic corrosion and sample thereof under the high-stress state of welded tube weld seam |
| CN201909737U (en) * | 2010-12-07 | 2011-07-27 | 北京有色金属研究总院 | Clamping device for metal material shear fracture test |
| CN102692373A (en) * | 2012-06-14 | 2012-09-26 | 华东理工大学 | Stress corrosion sensitivity evaluation device based on small punch rod test technology |
| CN203101235U (en) * | 2012-12-28 | 2013-07-31 | 中国石油天然气集团公司 | Metal fatigue stress corrosion detection tester |
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