CN106769286B - A kind of preparation method and application of plate welded unit fatigue testing specimen - Google Patents
A kind of preparation method and application of plate welded unit fatigue testing specimen Download PDFInfo
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- CN106769286B CN106769286B CN201611076258.5A CN201611076258A CN106769286B CN 106769286 B CN106769286 B CN 106769286B CN 201611076258 A CN201611076258 A CN 201611076258A CN 106769286 B CN106769286 B CN 106769286B
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000005520 cutting process Methods 0.000 claims abstract description 57
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000011888 foil Substances 0.000 claims description 25
- 239000011324 bead Substances 0.000 claims description 13
- 238000013519 translation Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 238000003032 molecular docking Methods 0.000 claims description 2
- 238000012496 stress study Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 3
- 206010016256 fatigue Diseases 0.000 description 20
- 238000011160 research Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 4
- 101100008046 Caenorhabditis elegans cut-2 gene Proteins 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
本发明公开了一种板状焊接构件疲劳试样的制备方法和应用，属于材料分析测试技术领域。该方法首先在板状焊接构件上粘贴应变片；然后根据逐条切割焊接构件时残余应力变化确定含残余应力疲劳试样的最小宽度和不含残余应力疲劳试样的最大宽度。本发明制备的板状疲劳试样，用于研究焊接残余应力对试样疲劳性能的影响。试样尺寸适当，制备重复性好，适用于常用的疲劳试验机，含残余应力试样中残余应力大小与焊接构件中相当，不含残余应力试样中残余应力已基本释放。The invention discloses a preparation method and application of a fatigue sample of a plate-shaped welded component, and belongs to the technical field of material analysis and testing. In this method, strain gauges are firstly attached to the plate-shaped welded member; then the minimum width of the fatigue specimen with residual stress and the maximum width of the fatigue specimen without residual stress are determined according to the change of residual stress when cutting the welded member one by one. The plate fatigue sample prepared by the invention is used to study the influence of welding residual stress on the fatigue performance of the sample. The sample size is appropriate and the preparation repeatability is good, and it is suitable for common fatigue testing machines. The residual stress in the sample with residual stress is equivalent to that of the welded component, and the residual stress in the sample without residual stress has been basically released.
Description
Technical field
The present invention relates to material analysis the field of test technology, and in particular to a kind of preparation of plate welded unit fatigue testing specimen
Methods and applications.
Background technique
In the welding process, material is often generated welding remnants in component and is answered due to non-uniform heated and deformation
Power.Influence of the welding residual stress to welded unit fatigue behaviour is the hot issue of domestic and foreign scholars' research.The research of early stage
Think that influence of the welding residual stress to welded unit fatigue behaviour can be ignored, but the research of later period scholar but obtains on the contrary
Conclusion.The main reason for later period, researcher pointed out, welding residual stress is limited to Fatigue Strength Effect in early fatigue experiment
Small size sample is used for experiment, residual-stress value therein is smaller.Some scholars use the examination of the level containing higher residual stresses
Sample carries out research shows that high residual tension can be substantially reduced the fatigue strength of component.However, by practical fatigue experiment equipment institute
Limit, fatigue testing specimen size cannot be very big.Therefore, in order to guarantee that experiment is gone on smoothly, while retaining the remnants in welded unit again
Stress, it is thus necessary to determine that the minimum dimension of the fatigue testing specimen containing residual stress.At the same time, in order to which comparative study residual stress is to welding
The influence of component fatigue performance, it is thus necessary to determine that the full-size without residual stress fatigue testing specimen.
It mainly cuts or welds using from welded unit about the experimental study of plate welded unit fatigue behaviour at present
The method of small sample.However specimen size specified in existing fatigue criteria does not account for residual stress pair in the sample of preparation
The influence of experimental result.For plate continuous weld welded unit fatigue testing specimen size determination there are no corresponding standard,
Only spot welding fatigue standard can be used as reference.Standard ISO 14324-2003 (Resistance spot welding-
Destructive tests of welds-Method for the fatigue testing of spot welded
Joints regulation in): when plate thickness is 0.5mm-1.5mm, tack-weld shear fatigue specimen width is 45mm；When plate thickness is
When 1.5mm-3mm, tack-weld shear fatigue specimen width is 60mm.
In conclusion influence needs of the research residual stress to plate welded unit fatigue life rationally take on component
Sample.Specimen size, which will cross low residual stress, to be discharged, although the excessive residual stress that saves of specimen size will lead to selection in fact
Test that equipment difficulty is big, and experimental cost increases.Therefore, it is necessary to invent a kind of plate welded unit fatigue testing specimen preparation method, make
Researcher can obtain the fatigue testing specimen for having residual stress and without residual stress by changing specimen size.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation method and application of plate welded unit fatigue testing specimen, party's legal systems
Standby specimen size is appropriate, prepare it is reproducible, be suitable for common fatigue tester, be applied to research welding residual stress pair
The influence of sample fatigue behaviour.
To achieve the above object, the technical solution adopted in the present invention is as follows:
A kind of preparation method of plate welded unit fatigue testing specimen, the fatigue testing specimen sampling, should in plate welded unit
The minimum widith and fatigue testing specimen without residual stress that method determines the fatigue testing specimen containing residual stress first respectively are most
Then big width is prepared two kinds of fatigue testing specimens containing residual stress and without residual stress by identified width；It is described to contain
The determination process packet of the maximum width of the minimum widith of the fatigue testing specimen of residual stress and the fatigue testing specimen without residual stress
Include following steps:
1) paste foil gauge on plate welded unit: strain gauge adhesion is in commissure and weld seam two sides；
2) it determines the minimum widith of the fatigue testing specimen containing residual stress: welded unit being carried out one by one along perpendicular to bead direction
Cutting, cutting process is from weldment end successively to foil gauge position translation；Residual stress changes after record is cut every time, passes through
Residual stress changes the minimum specimen width for being determined to holding member residual stress；
3) determine be free of residual stress fatigue testing specimen maximum width: along perpendicular to bead direction to welded unit carry out by
Item cutting, cutting process is from weldment end successively to foil gauge position translation；Residual stress changes after record is cut every time, leads to
It crosses residual stress and changes the fatigue testing specimen maximum width determined when residual stress discharges substantially.
In above-mentioned steps (1), the plate welded unit is to weld two plates by way of overlap joint, docking or corner connection
It connects.
In above-mentioned steps (1), the paste position of the foil gauge on component cut starting end at a distance from be greater than 50mm, weldering
The foil gauge that seam and weld seam two sides are pasted is located along the same line, and the straight line is perpendicular to bead direction；It glues weld seam two sides
The distance of the foil gauge of patch to straight line where weld seam is 1-10mm.
It is described to cut each cutting width one by one between 5mm-50mm in above-mentioned steps (2) and step (3), cutting
Width refers to the distance between the cutting line of adjacent cutting twice.
In above-mentioned steps (2), the foundation of the minimum widith of determination fatigue testing specimen containing residual stress are as follows: n-th cutting
Afterwards, when residual stress variation is no more than 20MPa compared with after the N-1 times cutting, 2 of the remaining width after n-th is cut
Minimum widith as the fatigue testing specimen containing residual stress again；Remaining width after the n-th cutting refers to foil gauge to n-th
Distance between the cutting line of cutting, N >=1.
In above-mentioned steps (3), the foundation of maximum width of the determination without residual stress fatigue testing specimen are as follows: n-th is cut
After cutting, compared with after last time cutting, when the difference of residual stress variation is not more than 20MPa, the residue after n-th is cut
2 times of width are as the maximum width for being free of residual stress fatigue testing specimen；Remaining width after the n-th cutting refers to strain
Distance between the cutting line that piece is cut to n-th, N >=1；Remaining width after the last time cutting is cut is zero.
Two kinds of fatigue testing specimens containing residual stress and without residual stress are prepared for using the above method, are applied
In influence of the research residual stress to plate welded unit fatigue life.
The present invention has the following advantages and beneficial effects:
Plate welded unit fatigue testing specimen prepared by the present invention, for studying welding residual stress to sample fatigue behaviour
It influences.Specimen size (width) suitably, prepares reproducible, is suitable for common fatigue tester, in sample containing residual stress
In residual stress size and welded unit quite, it has been discharged substantially without residual stress in residual stress sample.
Detailed description of the invention
Fig. 1 is plate welded unit schematic diagram.
Fig. 2 is welded unit cutting position and residual stress test position view.
Fig. 3 is the residual stress variation test result of embodiment 1.
Fig. 4 is the residual stress variation test result of embodiment 2.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and embodiments.
The present invention is the preparation method and application of plate welded unit fatigue testing specimen, and fatigue testing specimen sampling welds structure in plate
Part, welded unit is as shown in Figure 1, wherein W is component overall width.The preparation method specifically comprises the following steps:
1) foil gauge is pasted on plate welded unit: pasting foil gauge in commissure and weld seam two sides.
2) it determines the minimum widith of fatigue testing specimen containing residual stress: welded unit being cut one by one perpendicular to bead direction on edge
It cuts, records cutting residual stress every time and change situation, be not more than 20MPa when certain cuts front and back residual stress changing value
When, by 2 times of minimum widiths as the fatigue testing specimen containing residual stress of the remaining width after this time cutting, remaining width, which refers to, is answered
Become piece to distance between the cutting line of the secondary cutting.
3) it determines and is free of residual stress fatigue testing specimen maximum width: welded unit being carried out one by one along perpendicular to bead direction
Cutting, residual stress changes after recording cutting every time, when the residual stress for cutting to test point on sample (i.e. foil gauge) is basic
When release, that is, when residual stress variation and the difference of last time cutting variation are not more than 20MPa after cutting, after this is cut
2 times of remaining width as the maximum width for being free of residual stress fatigue testing specimen, remaining width refers to that foil gauge is cut to this time
Distance between the cutting line cut, last time cutting refer to that the remaining width after cutting is 0.
(4) it is prepared according to identified fatigue testing specimen maximum width and minimum widith containing residual stress and is answered without remnants
Two kinds of fatigue testing specimens of power, and influence of the research residual stress to plate welded unit fatigue life can be further applied.
Embodiment 1
In the present embodiment, selects and welded by the laser lap that the EN1.4318-2G stainless steel plate of two pieces of 2mm thickness is welded
Component is as objective for implementation.Detailed process is as follows:
1) foil gauge is pasted
As shown in Fig. 2, apart from Member Lip W0For at 55mm weld seam and weld seam two sides paste foil gauge weld seam two sides
The distance of foil gauge to weld seam is 5mm, and three foil gauges are on the same straight line perpendicular to bead direction.
2) minimum widith of fatigue testing specimen containing residual stress is determined
Along being cut one by one perpendicular to bead direction to component, the 1st time the width for cutting to n-th cutting is followed successively by
W1、W2、……、Wn, W in the present embodiment1=15mm, W2=15mm, W3=15mm, W4=5mm ... is recorded residual after cutting every time
Residue stress release value.As shown in figure 3, measurement point is 40mm away from Edge Distance after cutting for the first time, the measurement point 1 on weld seam is residual
Residue stress releases 10MPa, and residual stress releases 35MPa after second of cutting.Measurement point 2 and measurement apart from weld seam 5mm
Point 3, longitudinal (bead direction) residual stress variation are unobvious.Therefore it is determined according to residual stress release value containing residual stress fatigue
Sample minimum widith is 80mm.
3) it determines and is free of residual stress fatigue testing specimen maximum width
As shown in figure 3, (away from edge 0mm) when stress release value is 135MPa, completely release when measurement point 1 is away from edge 5mm
Stress release value is 153MPa, and the two difference is 18MPa, is less than 20MPa, so determining maximum without residual stress fatigue testing specimen
Width is 10mm.
Embodiment 2
In the present embodiment, selects and welded by the SUS301-DLT stainless steel plate of SUS301-HT and the 0.8mm thickness of 1.5mm thickness
Made of laser lap welded unit as objective for implementation.Detailed process is as follows:
1) foil gauge is pasted
As shown in Fig. 2, apart from Member Lip W0For at the weld seam and weld seam two sides 5mm at 55mm paste foil gauge, three
A foil gauge is on the same straight line perpendicular to bead direction.
2) minimum widith of fatigue testing specimen containing residual stress is determined
Along being cut one by one perpendicular to bead direction to component, the 1st time the width for cutting to n-th cutting is followed successively by
W1、W2、……、Wn, W in the present embodiment1=15mm, W2=15mm, W3=15mm, W4=5mm ... is recorded residual after cutting every time
Residue stress release value.As shown in figure 4, measurement point is 40mm away from Edge Distance after cutting for the first time, point 1, point 2 and the remnants for putting 3
Stress is released less than 20MPa, and point 1 and 3 residual stress of point release 60MPa after second of cutting, and 2 residual stress of point discharge
30MPa.Therefore determine that the minimum widith of fatigue testing specimen containing residual stress is 80mm according to residual stress release value.
3) it determines and is free of residual stress fatigue testing specimen maximum width
As shown in figure 4, (away from edge 0mm) when stress release value is 143MPa, completely release when measurement point 1 is away from edge 5mm
Stress release value is 155MPa, and the two difference is 12MPa, is less than 20MPa, so determining maximum without residual stress fatigue testing specimen
Width is 10mm.
Claims (7)
1. a kind of preparation method of plate welded unit fatigue testing specimen, it is characterised in that: the fatigue testing specimen sampling is welded in plate
Connection member, the minimum widith and fatigue testing specimen without residual stress for first determining the fatigue testing specimen containing residual stress respectively
Then maximum width is prepared two kinds of fatigue testing specimens containing residual stress and without residual stress by identified width；It is described
The determination process of the maximum width of the minimum widith of fatigue testing specimen containing residual stress and the fatigue testing specimen without residual stress
Include the following steps:
1) paste foil gauge on plate welded unit: strain gauge adhesion is in commissure and weld seam two sides；
2) it determines the minimum widith of the fatigue testing specimen containing residual stress: welded unit being cut one by one perpendicular to bead direction on edge
It cuts, cutting process is from weldment end successively to foil gauge position translation；Residual stress changes after record is cut every time, by residual
Residue stress changes the minimum specimen width for being determined to holding member residual stress；
3) it determines the maximum width for being free of residual stress fatigue testing specimen: welded unit being cut one by one perpendicular to bead direction on edge
It cuts, cutting process is from weldment end successively to foil gauge position translation；Residual stress changes after record is cut every time, by residual
Residue stress changes the fatigue testing specimen maximum width determined when residual stress discharges substantially.
2. the preparation method of plate welded unit fatigue testing specimen according to claim 1, it is characterised in that: in step (1),
The plate welded unit is that two plates are welded by way of overlap joint, docking or corner connection.
3. the preparation method of plate welded unit fatigue testing specimen according to claim 1, it is characterised in that: in step (1),
The paste position of the foil gauge is greater than 50mm with cutting on component at a distance from starting end, what weld seam and weld seam two sides were pasted answers
Become piece to be located along the same line, and the straight line is perpendicular to bead direction；It is straight where the foil gauge that weld seam two sides are pasted to weld seam
The distance of line is 1-10mm.
4. the preparation method of plate welded unit fatigue testing specimen according to claim 1, it is characterised in that: step (2) and
In step (3), described to cut each cutting width one by one between 5mm-50mm, cutting width refers to adjacent cutting twice
The distance between cutting line.
5. the preparation method of plate welded unit fatigue testing specimen according to claim 1, it is characterised in that: in step (2),
The foundation of the minimum widith of determination fatigue testing specimen containing residual stress are as follows: after n-th cutting, phase after with the N-1 times cutting
When than residual stress variation no more than 20MPa, 2 times of the remaining width after n-th is cut are tried as fatigue containing residual stress
The minimum widith of sample；Remaining width after n-th cutting refers to distance between cutting line that foil gauge is cut to n-th, N
≥1。
6. the preparation method of plate welded unit fatigue testing specimen according to claim 1, it is characterised in that: in step (3),
The foundation of maximum width of the determination without residual stress fatigue testing specimen are as follows: phase after being cut after n-th cutting with last time
Than when the difference of residual stress variation is not more than 20MPa, 2 times of the remaining width after n-th is cut are used as answers without remnants
The maximum width of power fatigue testing specimen；Remaining width after n-th cutting refer to cutting line that foil gauge is cut to n-th it
Between distance, N >=1；Remaining width after the last time cutting is cut is 0.
7. a kind of plate welded unit prepared by the preparation method using plate welded unit fatigue testing specimen described in claim 1
The application of fatigue testing specimen, it is characterised in that: be applied to two kinds of fatigue testing specimens containing residual stress and without residual stress
Study influence of the residual stress to plate welded unit fatigue life.
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| CN112355451B (en) * | 2020-09-21 | 2022-07-29 | 江阴兴澄特种钢铁有限公司 | Welding method of mining round-link chain |
| CN115081295B (en) * | 2022-07-14 | 2024-04-02 | 国家高速列车青岛技术创新中心 | Preparation method of fatigue test sample containing high-value welding residual stress |
| CN118862590B (en) * | 2024-09-14 | 2025-01-28 | 洛阳船舶材料研究所(中国船舶集团有限公司第七二五研究所) | A method for evaluating macroscopic welding residual stress in hull structural steel |
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2016
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