CN104458078A - H-shaped steel lateral residual stress detecting method - Google Patents
H-shaped steel lateral residual stress detecting method Download PDFInfo
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- CN104458078A CN104458078A CN201410804052.4A CN201410804052A CN104458078A CN 104458078 A CN104458078 A CN 104458078A CN 201410804052 A CN201410804052 A CN 201410804052A CN 104458078 A CN104458078 A CN 104458078A
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- test block
- residual stress
- test piece
- web
- foil gauge
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Abstract
The invention relates to an H-shaped steel lateral residual stress detecting method. The method is characterized in that a section 500 mm long is cut from a piece of detected H-shaped steel to serve as a test piece, totally six strain gauges are attached to the positions, 100 mm, 250 mm and 350 mm away from the ends of the test piece and located on two straight lines 100 mm away from wing edges on the two sides, of one face of a web of the test piece respectively, and the length direction of the strain gauges is consistent with the length direction of the test piece; after the strain gauges are attached to the selected positions, detecting and zero cleaning are conducted on the initial values of the strain gauges first; a gap 400 mm long is longitudinally sawn in the center of one end of the web of the test piece, the residual stress is released, and then the residual stress final value is measured. The method has the advantages that operation is easy and convenient, the detection accuracy is high, loss is reduced, and cost is saved.
Description
Technical field
The present invention relates to a kind of detection method of H profile steel side direction unrelieved stress, belong to detection field.
Background technology
H profile steel is mainly used in the aspects such as bridge, oceanographic engineering, plant equipment, house owed by a citizen, highway, industrial building, oil drilling platform, along with greatly developing of China's capital construction, large H-shaped steel can not meet the needs of development, therefore in the urgent need to development large H-shaped steel.
The aligning of H profile steel is one important procedure in production run, determines final mass and the precision of H profile steel.The H profile steel of different size is adopted to the straightening process of its correspondence, in the guarantee edge of a wing and web not flexural deformation, when reaching overall flatness, reduce unrelieved stress, avoid the phenomenon of aligning rear nose and bend fracture to occur.
Because H profile steel residual stress test does not have standard, do not detect the report of H profile steel with strain gauge method, how to detect is the problem studied at present.
Summary of the invention
The object of this invention is to provide a kind of detection method that fast, accurately can detect the H profile steel side direction unrelieved stress of the lateral thrust stress distribution of web.
Technical scheme of the present invention is as follows:
Detected H profile steel intercepts one section of 500mm length as test block, on one side at test block web, two straight lines apart from two side wing edge 100mm, a slice foil gauge is respectively pasted apart from test block termination 100mm, 250mm, 350mm, amount to 6 foil gauges, foil gauge length direction test block length direction is consistent, first foil gauge detects foil gauge initial value after posting by the position chosen, and resets; The long gap of a 400mm is longitudinally cut in the center of the web in one end of test block, and release unrelieved stress, then surveys unrelieved stress final value.
Principle of the present invention is: according to the bend fracture problem that will solve H profile steel, selects the region paster that stress is large, takes along web center, longitudinally cuts 400mm mono-seam, makes stress relief, then surveys unrelieved stress final value.
Advantage of the present invention is: easy and simple to handle, and the accuracy rate of detection is high, decreases loss, has saved cost.
Embodiment
Detected H profile steel intercepts one section of 500mm length as test block, on one side at test block web, two straight lines apart from two side wing edge 100mm, test point is selected in position apart from test block termination 100mm, 250mm, 350mm, polish in the position determining test point, each subsides a slice foil gauge, amounts to 6 foil gauges, foil gauge length direction test block length direction is consistent, first foil gauge detects foil gauge initial value after posting by the position chosen, and resets; The long gap of a 400mm is longitudinally cut in the center of the web in one end of test block, and release unrelieved stress, then surveys unrelieved stress final value, analysis and calculation principal direction of stress.
Solve the lateral thrust breakage problem of H profile steel, select the region paster that stress is large, test its initial value, take along web center, longitudinally cut 400mm mono-seam, make stress relief, then survey unrelieved stress final value, and analysis and calculation principal direction of stress.
Because the stress surveyed is lateral thrust stress, so cut direction is test block length direction, make test block when not fettering, release stress, force-bearing situation when could measure H profile steel lateral thrust truly, cut direction is incorrect, and the stress value measured is not bending stresses, or does not measure result or data are inaccurate; Can measure from heartcut, the trend that H profile steel is out of shape to both sides or curving.Foil gauge paster should be selected to accept the maximum direction of stress, i.e. length direction.Select 6 whole regional stress can be made to change substantially entirely to measure.
Claims (1)
1. the detection method of a H profile steel side direction unrelieved stress, it is characterized in that: in detected H profile steel, intercept one section of 500mm length as test block, on one side at test block web, two straight lines apart from two side wing edge 100mm, a slice foil gauge is respectively pasted apart from test block termination 100mm, 250mm, 350mm, amount to 6 foil gauges, foil gauge length direction test block length direction is consistent, after foil gauge posts by the position chosen, first foil gauge initial value is detected, reset; The long gap of a 400mm is longitudinally cut in the center of the web in one end of test block, and release unrelieved stress, then surveys unrelieved stress final value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410804052.4A CN104458078A (en) | 2014-12-23 | 2014-12-23 | H-shaped steel lateral residual stress detecting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410804052.4A CN104458078A (en) | 2014-12-23 | 2014-12-23 | H-shaped steel lateral residual stress detecting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104458078A true CN104458078A (en) | 2015-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410804052.4A Pending CN104458078A (en) | 2014-12-23 | 2014-12-23 | H-shaped steel lateral residual stress detecting method |
Country Status (1)
| Country | Link |
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| CN (1) | CN104458078A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201040897Y (en) * | 2007-05-22 | 2008-03-26 | 同济大学 | Special type flexion-resistant web H section steel |
| CN102608169A (en) * | 2012-03-01 | 2012-07-25 | 首钢总公司 | Method for determining precision of blind-hole method residual stress testing system |
| CN103234666A (en) * | 2013-04-26 | 2013-08-07 | 内蒙古包钢钢联股份有限公司 | Method for testing residual stress of steel rail |
| CN103278443A (en) * | 2013-04-26 | 2013-09-04 | 内蒙古包钢钢联股份有限公司 | Technology for testing seamless tube residual stress by pasting method |
-
2014
- 2014-12-23 CN CN201410804052.4A patent/CN104458078A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201040897Y (en) * | 2007-05-22 | 2008-03-26 | 同济大学 | Special type flexion-resistant web H section steel |
| CN102608169A (en) * | 2012-03-01 | 2012-07-25 | 首钢总公司 | Method for determining precision of blind-hole method residual stress testing system |
| CN103234666A (en) * | 2013-04-26 | 2013-08-07 | 内蒙古包钢钢联股份有限公司 | Method for testing residual stress of steel rail |
| CN103278443A (en) * | 2013-04-26 | 2013-09-04 | 内蒙古包钢钢联股份有限公司 | Technology for testing seamless tube residual stress by pasting method |
Non-Patent Citations (1)
| Title |
|---|
| 童乐为等: "Q460 高强度焊接H 型钢残余应力试验研究", 《工业建筑》, vol. 42, no. 1, 31 January 2012 (2012-01-31) * |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
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| RJ01 | Rejection of invention patent application after publication |