CN113281151A - Fatigue crack propagation strain characterization correlation method for welded structural part - Google Patents
Fatigue crack propagation strain characterization correlation method for welded structural part Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000012512 characterization method Methods 0.000 title claims description 6
- 238000009661 fatigue test Methods 0.000 claims abstract description 29
- 230000008569 process Effects 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 claims abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000010931 gold Substances 0.000 claims abstract description 6
- 229910052737 gold Inorganic materials 0.000 claims abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000003973 paint Substances 0.000 claims description 31
- 238000005507 spraying Methods 0.000 claims description 31
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 4
- 238000010422 painting Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 6
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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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
- G01N3/02—Details
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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
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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
- G01N1/32—Polishing; Etching
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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
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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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
- G01N3/12—Pressure testing
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Abstract
The embodiment of the specification discloses a method for representing and correlating fatigue crack propagation strain of a welded structural part. The method comprises the following steps: step 1, processing a single-side notch sample to prepare a gold phase surface and a speckle surface; step 2, fixing the sample processed in the step 1 on an electro-hydraulic servo fatigue machine through a clamping block, and calibrating the sample by adopting a calibration plate after setting fatigue test parameters; observing the golden picture surface by adopting a stereoscopic microscope, and shooting the speckle dispersing surface by adopting an industrial camera; step 3, starting a fatigue test, pausing the fatigue test machine when the crack is expanded, observing the crack expansion process by adopting a stereoscopic microscope and measuring the crack length; shooting a speckle scattering surface by using an industrial camera, obtaining a sample strain field and maximum strain, and recording fatigue cycle times; and 4, restarting the fatigue test, repeating the step 3 repeatedly until the crack length is the preset length, finishing the test, calculating a sample strain field and a maximum strain value, and generating a cycle number-maximum strain-crack length correlation diagram.
Description
Technical Field
The application relates to the technical field of computers, in particular to a fatigue crack propagation strain characterization correlation method for a welded structure.
Background
Stress of a part of a welding structural part in the ocean platform is concentrated, the part is a fatigue dangerous part and can be influenced by seawater impact, corrosion and the like, and the fatigue life is shortened. The strain is the local relative deformation of the material under the action of factors such as external force, non-uniform temperature field and the like, and is one of important factors for constructing the constitutive equation of the material of the welded structural part. At present, material strain calculation is mainly obtained by methods such as strain gauges and finite element simulation, but the operation process of the strain gauges is complex, and the strain gauges are easy to fall off in the high-frequency and high-load fatigue process; although the finite element can accurately obtain the material strain field in an ideal state, in the actual engineering, inevitable defects exist in a welded structural part, and the stress balance state in the finite element is destroyed, so that the calculation result of the finite element has a certain difference from the actual application. Therefore, the strain field change rule in the fatigue process needs to be represented.
Disclosure of Invention
In view of the above, the invention provides a characterization and association method for fatigue crack propagation strain of a welded structure, which can simply and accurately associate the relationship among the cycle times, the maximum strain and the crack length of a base metal, a heat affected zone, a fusion zone and the like in the welded structure, reveal the change rule of a material strain field in the fatigue process, obtain the strain field in the fatigue crack propagation process, and provide important theoretical basis and guiding significance for marine petroleum engineering and application materials thereof in China.
In order to solve the above technical problem, the embodiments of the present specification are implemented as follows:
the embodiment of the specification provides a method for characterizing and correlating fatigue crack propagation strain of a welded structure, which comprises the following steps:
step 1, polishing the front surface of a single-side notch sample to prepare a gold phase surface; spraying paint on the rear surface of the single-side notch sample to prepare a spot scattering surface;
step 3, starting a fatigue test experiment, pausing the fatigue testing machine when the crack is expanded, observing the crack expansion process by adopting the stereoscopic microscope and measuring the crack length; shooting the speckle surface by using the industrial camera, obtaining a sample strain field and maximum strain, and recording fatigue cycle times;
and 4, restarting the fatigue test, repeating the step 3 repeatedly until the crack length is the preset length, finishing the test, calculating a sample strain field and a maximum strain value, and generating a cycle number-maximum strain-crack length correlation diagram.
Optionally, the preparation of the spot scattering surface by painting on the rear surface of the single-edge notch sample specifically includes:
the rear surface of the unilateral notch sample is sprayed with white matte paint until the white matte paint covers the notch of the unilateral notch sample, then the paint is dried and sprayed, the sample surface of the white matte paint is sprayed with black matte paint, then the paint is dried and sprayed, and scattered spot surfaces are prepared.
Optionally, an annular light source is arranged between the stereoscopic microscope and the single-side notch sample, and an annular light source is arranged between the industrial camera and the single-side notch sample.
Optionally, the stereoscopic microscope and the industrial camera are fixed by a tripod.
Optionally, the measuring the crack length by using the measurement software specifically includes: setting a crack starting point, setting a crack length end point in the horizontal direction, and combining a calibration plate to obtain the crack projection length.
Optionally, the pause time range of the fatigue testing machine is 20 s-60 s.
Optionally, the spraying height of the sprayed white matte paint is 20-35 cm, the spraying angle is 30-45 degrees, and the spraying distance is 20-30 cm.
Optionally, the spraying height of the black matte paint is 30-40 cm, the spraying angle is 20-35 degrees, and the spraying distance is 20-30 cm.
Optionally, the preset length is 1/2 of the width of the single-edge notched sample.
Optionally, in step 4, a strain field and a maximum strain value of the sample are obtained by using DIC software, and an association diagram of cycle number-maximum strain-crack length is obtained by using origin software.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic flow chart of a method for correlating fatigue crack growth strain characterization of a welded structure according to an embodiment of the present disclosure;
FIG. 2 is a diagram of SENT specimen size in the example;
FIG. 3 is a graph of crack length a versus number of cycles N for the examples;
fig. 4 is the strain field for the N =5084 sample in the example;
fig. 5 is the strain field of the N =57299 sample in the example;
fig. 6 is the strain field of the N =87441 sample in the example;
fig. 7 is the strain field of the N =118686 sample in the example;
fig. 8 is the strain field for the N =126324 sample of the example;
fig. 9 is the strain field for the N =135777 sample of the example;
FIG. 10 shows the number of cycles N-maximum strain ε in examplesmax&The crack length a is plotted.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The Digital Image Correlation (DIC) technology is a non-contact modern optical measurement experiment technology, and has the advantages of simple optical path, good environmental adaptability, wide measurement range, high automation degree and the like, and is widely applied to many scientific and engineering fields such as machinery, material science, welding and the like.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic flowchart of a method for characterizing and correlating fatigue crack propagation strain of a welded structure according to an embodiment of the present disclosure. From the viewpoint of a program, the execution subject of the flow may be a program installed in an application server or an application client.
As shown in fig. 1, the process may include the following steps:
step 1, polishing the front surface of a single-side notch sample to prepare a gold phase surface; and spraying paint on the rear surface of the single-edge notch sample to prepare a spot scattering surface.
Grinding the front surface of a single-edge notch (SENT) sample by adopting different types of abrasive paper on one surface of the sample, and polishing the front surface to obtain a gold phase surface of the sample; spraying white matte paint on the rear surface of the sample until the white matte paint covers the position near the gap of the sample, wherein the spraying height is 20-35 cm, the spraying angle is 30-45 degrees, the spraying distance is 20-30 cm, and then drying and spraying the paint by using a blower; spraying black matte paint on the surface of the covered white matte paint spraying sample, wherein the spraying height is 30-40 cm, the spraying angle is 20-35 degrees, the spraying distance is 20-30 cm, and then drying and spraying the paint by using a blower again to prepare a spot scattering surface;
Fixing the sample in the step 1 on an electro-hydraulic servo fatigue machine through a clamping block, and calibrating the sample by using a calibration plate after setting fatigue test parameters; observing the metallographic surface in the step (1) by using a stereoscopic microscope, and connecting the stereoscopic microscope with a computer and measurement software for calculating the length of the crack; and (3) shooting the speckle scattering surface by using an industrial camera, and connecting the industrial camera with a computer and DIC software to obtain a sample strain field.
Step 3, starting a fatigue test experiment, pausing the fatigue testing machine when the crack is expanded, observing the crack expansion process by adopting the stereoscopic microscope and measuring the crack length; and shooting the scattered spot surface by adopting the industrial camera, obtaining a sample strain field and the maximum strain, and recording the fatigue cycle times.
Observing the crack propagation process by using the stereoscopic microscope in the step (2) and measuring the length of the crack by using measurement software; and (3) shooting the sample speckle surface by an industrial camera, then obtaining a sample strain field and the maximum strain through DIC software, and recording the fatigue cycle number N.
And 4, restarting the fatigue test, repeating the step 3 repeatedly until the crack length is the preset length, finishing the test, calculating a sample strain field and a maximum strain value, and generating a cycle number-maximum strain-crack length correlation diagram.
Optionally, the experiment is ended until the crack length is about 1/2 of the SENT sample width, then DIC software is used for obtaining a sample strain field and a maximum strain value, and origin software is used for obtaining the cycle number N-maximum strain epsilonmax&A correlation map of crack length a;
in addition, an annular light source may be required to be arranged between the stereoscopic microscope and the industrial camera in the step 2 and the sample;
in addition, the stereomicroscope and the industrial camera in step 2 may be required to be fixed by a tripod;
in addition, the specific implementation method for calculating the crack length by the measurement software in the step 3 can be further required to be that a crack starting point is set, a crack length end point is set in the horizontal direction, and the crack projection length is obtained by combining a calibration plate;
in addition, the pause time range of the fatigue testing machine in the step 3 can be required to be 20-60 s.
The method shown in the figure 1 can directly obtain the strain field of the SENT sample through a fatigue test, and the strain field in the fatigue crack expansion process can be obtained by correlating triple correlations between the fatigue cycle number N and the maximum strain value/crack length of the sample in the whole process of the fatigue test.
The technical scheme of the invention is further described in detail by combining the drawings and the specific embodiments, and the specific implementation steps are as follows:
1) the fatigue test adopts marine steel EH36, EH36 steel is cut into a single-side notch SENT sample with the specification shown in figure 2 by a wire cutting technology, the thickness is 1 mm, a polished surface is prepared on the front surface of the sample, and a gold phase surface is obtained after the polished surface is corroded for 40 seconds by 7 wt% of nitric acid alcohol; spraying white matte paint on the rear surface of the sample until the white matte paint covers the position near the gap of the sample, wherein the spraying height is 20-35 cm, the spraying angle is 30-45 degrees, the spraying distance is 20-30 cm, and then drying and spraying the paint by using a blower; spraying black matte paint on the surface of the covered white matte paint spraying sample, wherein the spraying height is 30-40 cm, the spraying angle is 20-35 degrees, the spraying distance is 20-30 cm, and then drying and spraying the paint by using a blower again to prepare a spot scattering surface;
2) fixing the sample obtained in the step 1 on an electro-hydraulic servo fatigue machine through a clamping block, and calibrating the sample by adopting a calibration plate after setting fatigue test parameters; observing the metallographic surface in the step (1) by using a stereoscopic microscope, and connecting the stereoscopic microscope with a computer and measurement software for calculating the length of the crack; shooting a speckle scattering surface by using an industrial camera, and connecting the industrial camera with a computer and DIC software to obtain a sample strain field;
3) starting a fatigue test, pausing the fatigue testing machine when the cycle number N =5084, and obtaining the fatigue crack length of 1.381 mm at the moment through the measurement software in the step (2); shooting the speckle scattering surface of the sample at the moment by an industrial camera, and then obtaining a strain field and the maximum strain of the sample through DIC software, wherein the maximum strain is 0.0204 at the moment as shown in figure 4;
4) the fatigue test was restarted, step (3) was repeated repeatedly, and DIC software was used to obtain the cycle shown in FIG. 5A specimen strain field when the number of cycles N =57299, the specimen strain field when the maximum strain was 0.0782 and the number of cycles N =87441 shown in fig. 6, a specimen strain field when the maximum strain was 0.1397 and the number of cycles N =118686 shown in fig. 7, a specimen strain field when the maximum strain was 0.3749 and the number of cycles N =126324 shown in fig. 8, a specimen strain field when the maximum strain was 0.4937 and the number of cycles N =139768 shown in fig. 8, the maximum strain was 0.5 and the crack length was 10.822 mm, and the test was stopped; the number of cycles N-maximum strain ε shown in FIG. 10 was obtained using origin softwaremax&The crack length a is plotted.
2, an annular light source is arranged between the stereoscopic microscope and the industrial camera and the sample;
in the step 2, fatigue test parameters are set to be 7.2 kN of fatigue average load, 8.8 kN of alternating load, 130 Hz of fatigue frequency, a waveform is a sine wave, and the stress ratio is 0.1;
step 3, the specific implementation method for calculating the crack length by the measuring software is that a crack starting point is set, a crack length end point is set in the horizontal direction, and the crack projection length is obtained by combining a calibration plate;
and 3, pausing the fatigue testing machine for 20-60 s.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A method for correlating fatigue crack growth strain characterization of a welded structure, the method comprising:
step 1, polishing the front surface of a single-side notch sample to prepare a gold phase surface; spraying paint on the rear surface of the single-side notch sample to prepare a spot scattering surface;
step 2, fixing the single-side notch sample processed in the step 1 on an electro-hydraulic servo fatigue machine through a clamping block, and calibrating the single-side notch sample by adopting a calibration plate after setting fatigue test parameters; observing the golden photo surface by using a stereoscopic microscope, and shooting the speckle dispersing surface by using an industrial camera;
step 3, starting a fatigue test experiment, pausing the fatigue testing machine when the crack is expanded, observing the crack expansion process by adopting the stereoscopic microscope and measuring the crack length; shooting the speckle surface by using the industrial camera, obtaining a sample strain field and maximum strain, and recording fatigue cycle times;
and 4, restarting the fatigue test, repeating the step 3 repeatedly until the crack length is the preset length, finishing the test, calculating a sample strain field and a maximum strain value, and generating a cycle number-maximum strain-crack length correlation diagram.
2. The method of claim 1, wherein painting the rear surface of the single-edge notched specimen to produce a patched surface comprises:
the rear surface of the unilateral notch sample is sprayed with white matte paint until the white matte paint covers the notch of the unilateral notch sample, then the paint is dried and sprayed, the sample surface of the white matte paint is sprayed with black matte paint, then the paint is dried and sprayed, and scattered spot surfaces are prepared.
3. The method of claim 1, wherein a ring light source is positioned between the stereomicroscope and the single-edge notched specimen and a ring light source is positioned between the industrial camera and the single-edge notched specimen.
4. The method of claim 1, wherein the stereoscopic microscope and the industrial camera are held by a tripod.
5. The method of claim 1, wherein measuring the crack length using measurement software comprises: setting a crack starting point, setting a crack length end point in the horizontal direction, and combining a calibration plate to obtain the crack projection length.
6. The method of claim 1, wherein the fatigue testing machine has a dwell time in the range of 20s to 60 s.
7. The method according to claim 1, wherein the white matte paint is sprayed at a spray height of 20 to 35 cm, a spray angle of 30 to 45 ° and a spray distance of 20 to 30 cm.
8. The method according to claim 1, wherein the black matte paint is sprayed at a spray height of 30cm to 40 cm, a spray angle of 20 ° to 35 °, and a spray distance of 20cm to 30 cm.
9. The method of claim 1, wherein the predetermined length is 1/2 of the width of the single-edge notched specimen.
10. The method according to claim 1, wherein in step 4, DIC software is used to obtain the strain field and the maximum strain value of the sample, and origin software is used to obtain the correlation diagram of cycle number-maximum strain-crack length.
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Cited By (3)
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| CN114383942A (en) * | 2022-01-12 | 2022-04-22 | 华东理工大学 | In-situ test method for stripping performance of brazed joint and in-situ test sample |
| CN115046872A (en) * | 2022-08-09 | 2022-09-13 | 南通泰胜蓝岛海洋工程有限公司 | Fatigue crack real-time measuring method |
| CN115081321A (en) * | 2022-06-15 | 2022-09-20 | 天津大学 | Corrosion fatigue life prediction method, system and equipment for marine welding structure |
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| JP2014102132A (en) * | 2012-11-19 | 2014-06-05 | Institute Of Nuclear Safety System Inc | Low cycle fatigue crack growth evaluation method |
| CN105181492A (en) * | 2015-07-23 | 2015-12-23 | 中国科学院力学研究所 | Measuring method for surface strengthening member fatigue crack expansion rate |
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| CN114383942A (en) * | 2022-01-12 | 2022-04-22 | 华东理工大学 | In-situ test method for stripping performance of brazed joint and in-situ test sample |
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