CN103439467B - A kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube - Google Patents
A kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube Download PDFInfo
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- CN103439467B CN103439467B CN201310392622.9A CN201310392622A CN103439467B CN 103439467 B CN103439467 B CN 103439467B CN 201310392622 A CN201310392622 A CN 201310392622A CN 103439467 B CN103439467 B CN 103439467B
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- gypsum
- crack
- crown
- site
- steel tube
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Abstract
The invention discloses a kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube, present invention utilizes the plasticity of gypsum, mobility, stability, by the state of development visualize of crackle, the angle of inclination of crackle is determined in gypsum mold finally by hardened forming, the method is simple, easy to operate, usable range is extensive, measuring accuracy is high, economical and practical, destroys detected parts not damaged.
Description
Technical field
The present invention relates to a kind of measuring method of crack inclination angle degree, specifically a kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube.
Background technology
Welded tubular joints is widely used in the large scale structure engineerings such as offshore platform structure, bridge structure and gymnasium; Environment residing for offshore platform structure is relatively more severe, and subjects alternate load effect for a long time; Bridge structure in-service, then can bear the various alternate load effects such as car load, wind load, current scour, earthquake; Therefore, pipe node in these structures is through certain military service after date, there is fatigure failure possibly, and the fatigure failure of pipe node generally occurs in around the weld seam of supervisor and arm intersection, show as weld cracking, the fatigue break performance of lot of domestic and foreign scholar to pipe node has carried out experimental study; Research finds: no matter penetrability fatigue crack or surface fatigue crackle, angle of inclination of crack growth is an important parameter, and the fragmentation parameters such as its stress intensity factor on crack tip, J anomalous integral crack tip opening displacement (CTOD) have larger impact; But fatigue crack generally results from primary branch passes through around the weld seam at place mutually, the location comparison residing for it is special, and after the fatigue crack of test specimen is opened, adopt direct measuring method to measure, precision is low, operates more difficult.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube, utilize gypsum to shape the measurement indirectly completed Welded Node of Steel Pipe Truss saddle point place crack inclination angle degree, do not need directly to measure Welded Node of Steel Pipe Truss saddle point place crack inclination angle degree.
To achieve these goals, the technical solution used in the present invention is: a kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube, comprises the following steps:
The first step, smear gypsum:
First around crown site of tubular joint of steel tube fatigue crack face, a small amount of release agent is smeared; Tap water and plaster stone are prepared according to a certain percentage and reconcile into the moderate gypsum of viscosity, then deployed gypsum is evenly pasted crack surface and around;
Second step, cut sample, measurement:
Leave standstill and harden completely to gypsum for 2-3 days, gypsum is taken off from test specimen, becomes next step measuring gypsum mold; Needing the some place measured, gypsum mold is cut, form gypsum mold section, then each gypsum mold is cut into slices placing flat on blank sheet of paper, and its profiled outline figure is depicted on paper, described flaw angle is the angle of the extended line of crack surface vertical section outline line and the surface line of arm, with the expansion angle of inclination adopting protractor to measure crackle from the profiled outline figure paper.
The present invention takes full advantage of plasticity, mobility, the stability of gypsum, by the state of development visualize of crackle, the angle of inclination of crackle is determined in gypsum mold finally by hardened forming, the method is simple, easy to operate, usable range is extensive, measuring accuracy is high, economical and practical, destroys detected parts not damaged.
Accompanying drawing explanation
Fig. 1 is the welded K-joint of steel tubular comb point location drawing;
Fig. 2 is crack model slicing profile and crack inclination angle schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is the welded K-joint of steel tubular comb point location drawing,
Measuring method is as following:
1, tap water and plaster stone are reconciled into the moderate gypsum of viscosity by the proportions of 1:2 ~ 3, commercially available common gypsum;
2, around crown site of tubular joint of steel tube fatigue crack face, smear a small amount of release agent, then the gypsum configured is pasted at crack surface place;
3, gypsum layering in the process of smearing is implemented, and smeared rear hand for every layer and constantly patted, guarantee that gypsum contacts completely with crack surface and tube wall face, smear and be divided into 2 ~ 3 layers, thickness is at about 2 ~ 3cm;
4, leave standstill after 2-3 days, gypsum hardens completely, gypsum mold is taken off from test specimen carefully;
5, along crack length direction needing the place pencil measured mark, then marking with 10 to 12 cun of hacksaws along passing through and cutting perpendicular to crack length direction;
6, the section of plaster cast is lain on blank sheet of paper, depict its profile outline with pencil, as shown in Figure 2, boost line is made in the position according to crackle, determine crown site of tubular joint of steel tube Crack Extension tiltangleθ angle, θ angle is the angle of crack surface tangent line and arm.
7, last use amount hornwork measures θ angle.
Claims (3)
1. a measuring method for crack propagation inclination angle of crown site of tubular joint of steel tube, is characterized in that comprising the following steps: the first step, smears gypsum: first around crown site of tubular joint of steel tube fatigue crack face, smear a small amount of release agent; Tap water and plaster stone are prepared according to a certain percentage and reconcile into the moderate gypsum of viscosity, then deployed gypsum is evenly pasted crack surface and around; Second step, cuts sample, measurement: leave standstill and harden completely to gypsum for 2-3 days, taken off by gypsum, become next step measuring gypsum mold from test specimen; At the some place needing to measure, gypsum mold is marked along passing through and cuts perpendicular to crack length direction, form gypsum mold section, then each gypsum mold is cut into slices placing flat on blank sheet of paper, and its profiled outline figure is depicted on paper, described angle of inclination of crack growth is the angle of the extended line of crack surface vertical section outline line and the surface line of arm, with the expansion angle of inclination adopting protractor to measure crackle from the profiled outline figure paper.
2. a kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube according to right 1, it is characterized in that: described in smear gypsum and comprise: by gypsum uniform application in steel pipe cracks, layering is smeared, and thickness in monolayer is at 1cm, divide two to three layers, gross thickness is 2 ~ 3cm; Every layer smear after need constantly to pat with hand, itself and crack surface and tube wall are connect closely knit, and extrude the bubble in lotion.
3. a kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube according to right 1, is characterized in that: described gypsum mold 10 to 12 cun of hacksaw blade sawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310392622.9A CN103439467B (en) | 2013-09-02 | 2013-09-02 | A kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310392622.9A CN103439467B (en) | 2013-09-02 | 2013-09-02 | A kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103439467A CN103439467A (en) | 2013-12-11 |
| CN103439467B true CN103439467B (en) | 2015-08-19 |
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| CN201310392622.9A Expired - Fee Related CN103439467B (en) | 2013-09-02 | 2013-09-02 | A kind of measuring method of crack propagation inclination angle of crown site of tubular joint of steel tube |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109540066B (en) * | 2018-11-20 | 2020-09-01 | 中国航发贵州黎阳航空动力有限公司 | Vortex comparison test block metering method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033954A (en) * | 2007-02-06 | 2007-09-12 | 华中科技大学温州先进制造技术研究院 | Liquid assisted section scanning measurement method for three-dimensional form |
| CN101368407A (en) * | 2008-09-19 | 2009-02-18 | 清华大学 | High tensility shock-resistant node of steel structure |
| CN101441057A (en) * | 2008-12-18 | 2009-05-27 | 南车成都机车车辆有限公司 | Branch tube measuring apparatus and measuring method |
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2013
- 2013-09-02 CN CN201310392622.9A patent/CN103439467B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033954A (en) * | 2007-02-06 | 2007-09-12 | 华中科技大学温州先进制造技术研究院 | Liquid assisted section scanning measurement method for three-dimensional form |
| CN101368407A (en) * | 2008-09-19 | 2009-02-18 | 清华大学 | High tensility shock-resistant node of steel structure |
| CN101441057A (en) * | 2008-12-18 | 2009-05-27 | 南车成都机车车辆有限公司 | Branch tube measuring apparatus and measuring method |
Non-Patent Citations (1)
| Title |
|---|
| 双向载荷比及裂纹倾斜角对表面裂纹扩展速率的影响;曾昭景 等;《化工机械》;19921231;第258-261页 * |
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| CN103439467A (en) | 2013-12-11 |
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