CN103529129A - C-shaped ring device used for fixed value calibration of tensile residual stress - Google Patents
C-shaped ring device used for fixed value calibration of tensile residual stress Download PDFInfo
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- CN103529129A CN103529129A CN201310465140.1A CN201310465140A CN103529129A CN 103529129 A CN103529129 A CN 103529129A CN 201310465140 A CN201310465140 A CN 201310465140A CN 103529129 A CN103529129 A CN 103529129A
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Abstract
The invention relates to a C-shaped ring device used for fixed value calibration of tensile residual stress. According to the device, tensile stress values in different sizes can be produced in a calibration zone only through external diameter adjustment of the C-shaped ring by screwing a nut without the need of a deformeter or other complex auxiliary instruments. The sizes of the stress values can be calculated by deformation of the external diameter. Numerical values are labeled in a stressing screw as scales, thus facilitating operation on site. Detection calibration of ultrasonic wave residual stress is achieved by utilization of the tensile stress generated in the calibration zone, thus furthest guaranteeing reliability of the residual stress detection results.
Description
One, technical field
The present invention proposes a kind of C shape loop device for the unrelieved stress definite value calibration that stretches, and this device is applicable to the field calibration of unrelieved stress Ultrasonic Nondestructive system.
Two, background technology
The Non-Destructive Testing of unrelieved stress is paid close attention to always widely, and supercritical ultrasonics technology is one of main detection method, and it is mainly to utilize the variation of ultrasound wave velocity of sound in detected material to carry out reaction stress state.The theory of supercritical ultrasonics technology is comparatively ripe, but according to Sound elasticity principle, what supercritical ultrasonics technology detected is relative residual stress value, wants to realize the detection to absolute residual-stress value, need to develop ultrasound wave calibrating installation testing result and detection system are calibrated.
Literature search is found, paper: (S.Quinn, J.M.Dulieu-Barton, etc.Progress in Thermoelastic Residual Stress Measurement[J] .Strain, 2004,40:127-133.), mentioned the shape of steel bending Cheng Gong, by crooked method, produced unrelieved stress test block and calibrate X ray stress ga(u)ge.Patent: (Jiang Chuanhai waits .X ray stress to measure the preparation method [P] of calibration sample. the patent No.: CN200510023292.1,2005) a kind of method of utilizing the series of process such as modified, shot-peening, corrosion to prepare stress calibration sample disclosed.Above two pieces of document methods used are all comparatively complicated, and are all for x-ray method.The calibration that does not also have at present document to detect for ultrasound wave unrelieved stress is both at home and abroad studied.
By screwing nut, regulate the external diameter of C shape ring, can produce in calibration region the tensile stress value of different sizes, for the field calibration operation of ultrasound wave tension gauge.This sample preparation is simple, easy and simple to handle, need to, by servicing units such as strainmeters, can farthest not guarantee the reliability of unrelieved stress testing result.
Three, summary of the invention
The object of this invention is to provide a kind ofly without by complicated servicing units such as strainmeters, only by setting nut, make C shape ring produce distortion, thereby the tension of utilizing its calibration region to produce has been calibrated the device that ultrasound wave unrelieved stress detects.
The object of the present invention is achieved like this, chooses the annulus material that meets certain size requirement, and the attribute of this material and tested unrelieved stress material are basic identical.Annulus is made a call in diametric(al) to 2 through holes, the size in hole is determined according to the external diameter that is selected bolt.Annulus is cut away to a bit of circular arc on the one side perpendicular to through-hole diameter direction, be made into C shape ring-type, the radian size of cutting is determined according to the intensity of material.Selected bolt is inserted to 2 through holes, then turn nut.By the tightness of setting nut, make the tension of the calibration region generation certain numerical value of C shape ring, this numerical value can calculate by formula, and numerical value is labeled on afterburning screw rod with scale, is convenient to execute-in-place.
Four, accompanying drawing explanation
Fig. 1 C shape ring tension calibrating installation planimetric map
Fig. 2 C shape ring removes primary stress heat treatment cycle curve
Fig. 3 has the screw-rod structure figure of stress scale value
Fig. 4 C shape ring tension calibrating installation stereographic map
1-bolt 2-calibration region 3-tension direction 4-compressive stress direction 5-C shape ring 6-nut 7-tension graduated scale
Five, embodiment
Below the specific embodiment of the present invention is elaborated:
As shown in Figure 1, choosing of C shape ring material should be as the criterion to be detected unrelieved stress material, and if detected object is gas pipe line X70 steel, C shape ring material is X70 steel, and detected object is general armour steel, and C shape ring material is general armour steel.
The D outer diameter of C shape ring
1scope be 95～150mm, occurrence can be determined according to the detection distance of Ultrasonic Detection sensor, as long as the radian of external diameter does not affect transducer calibration stress value.
The wall thickness range of C shape ring is 5～15mm, occurrence can be determined according to the thickness of detected object, if detected material is 5mm thickness, can select the C shape ring of 5mm thickness, detected material is 12mm thickness, can select the C shape ring of 12mm thickness, meanwhile, the external diameter of C shape ring and the ratio of thickness preferably remain in 10～20 scope.
Two through-hole diameters in C shape ring diameter direction are a bit larger tham bolt D outer diameter
3.Screw bolt and nut is in the situation that meeting requirement of strength, and its size and material can be determined according to standard component.
The angle θ scope of C shape rings cut is 5～30 °, and occurrence need to be determined according to C shape ring yield strength.It mainly plays 2 effects, and the one, cause C shape ring external diameter to change and produce stress, the 2nd, when stress value reaches material yield intensity, incision is closed, thereby prevents from damaging C shape ring calibrating installation.
The scope of C shape ring height H is 40～80mm, and occurrence can be according to the bolt D outer diameter of choosing
3determine, i.e. H and D
3ratio preferably remain in 2～4 scope.
C shape ring surface must not have the defects such as cut, pit, burr.Surface roughness Ra≤1.6 of its calibration region.Surfaceness is less, and the scattering that sound wave occurs in component surface is just less, and the ultrasonic energy inciding in member is just more, and the signal of reception will be stronger, improved accuracy of detection.
The weight of C shape ring calibrating installation is about 1kg, and quality is light, volume is little, be easy to execute-in-place, removed complicated auxiliary equipment from, has guaranteed the good working state of system.
As shown in Figure 2, to the thermal treatment of C shape ring, eliminate the primary stress that it produces in process.C shape ring by room temperature state slowly, equably in heat-treatment furnace heating (firing rate is V
1≤ 200 ℃/h) to 300～400 ℃ of left and right (actual temp is determined according to C shape ring material), then isothermal 0.5～1 hour (concrete basis of time C shape ring thickness and size and determine), makes C shape encircle bulk temperature uniformity.Again with V
1firing rate be heated to 550 ℃～650 ℃ (actual temp is determined according to C shape ring material), and at this temperature, be incubated 6～8 hours (concrete basis of time C shape ring thickness and size and determine).Temperature (cooling velocity V lentamente then
2≤ 250 ℃/h) in heat-treatment furnace, be cooled to below 120 ℃, then come out of the stove and be cooled to room temperature.After thermal treatment completes, surface of the work oxide film is cleared up.
As shown in Figure 3, screw flight place mills out a plane, has some scale marks in plane, and each scale mark subscript understands the size of tensile stress value.Screw rod scale number is generally 5～10, and concrete condition is determined the corresponding tensile stress value of each scale according to the strength of materials of C shape ring.
When as shown in Figure 4, nut is tightened onto scale place, can reads easily and should have tensile stress value.The end face that encircles a side as deviated from C shape when nut just overlaps with scale mark, and the numerical value that overlapping position scale mark marks is 50MPa, and the tension that explanation now produces in calibration region is 50MPa.
Claims (10)
1. for a C shape loop device for the unrelieved stress definite value calibration that stretches, it is characterized in that: it comprises C shape ring, bolt, nut.
2. C shape is encircled according to claim 1, and choosing of its material should be as the criterion to be detected unrelieved stress material.
3. C shape is encircled according to claim 1, and the scope of its external diameter is 95～150mm, and occurrence can be determined according to the detection distance of Ultrasonic Detection sensor, as long as the radian of external diameter does not affect transducer calibration stress value.
4. C shape ring according to claim 1, its wall thickness range is 5～15mm, and the external diameter of C shape ring and the ratio of thickness preferably remain in 10～20 scope, and occurrence can be determined according to the thickness of detected object, but can not exceed wall thickness range.
5. C shape is encircled according to claim 1, and the angle θ scope of its otch is 5～30 °, and occurrence need to be determined according to C shape ring yield strength.
6. C shape is encircled according to claim 1, and scope of its height is 40～80mm, and occurrence can be according to the bolt D outer diameter of choosing
3determine, i.e. H and D
3ratio preferably remain in 2～4 scope.
7. C shape is encircled according to claim 1, and must not there be the defects such as cut, pit, burr on its surface.Surface roughness Ra≤1.6 of its calibration region.
8. C shape is encircled according to claim 1, need after preliminary working, eliminate its primary stress.The method adopting is thermal treatment, C shape ring by room temperature state slowly, equably in heat-treatment furnace heating (firing rate is V
1≤ 200 ℃/h) to 300～400 ℃ of left and right (actual temp is determined according to C shape ring material), then isothermal 0.5～1 hour (concrete basis of time C shape ring thickness and size and determine), makes C shape encircle bulk temperature uniformity.Again with V
1firing rate be heated to 550 ℃～650 ℃ (actual temp is determined according to C shape ring material), and at this temperature, be incubated 6～8 hours (concrete basis of time C shape ring thickness and size and determine).Temperature (cooling velocity V lentamente then
2≤ 250 ℃/h) in heat-treatment furnace, be cooled to below 120 ℃, then come out of the stove and be cooled to room temperature.After thermal treatment completes, surface of the work oxide film is cleared up.
9. bolt, nut according to claim 1, screw bolt and nut is meeting with C shape ring no-float and intensity suitable in the situation that, and its size and material can be determined according to standard component.
10. bolt according to claim 1, its screw flight place mills out a plane, in plane, there are some scale marks, the number of its scale is generally 5～10, concrete condition is determined according to the strength of materials of C shape ring, each scale mark subscript understands the size of tensile stress value, when nut is tightened onto this place, can reads easily and should have tensile stress value.
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| CN201310465140.1A CN103529129A (en) | 2013-10-08 | 2013-10-08 | C-shaped ring device used for fixed value calibration of tensile residual stress |
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| CN201310465140.1A CN103529129A (en) | 2013-10-08 | 2013-10-08 | C-shaped ring device used for fixed value calibration of tensile residual stress |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822754A (en) * | 2014-03-12 | 2014-05-28 | 北京理工大学 | Pressure stress generating device for calibration of stress measurement system |
| CN103837603A (en) * | 2014-02-28 | 2014-06-04 | 北京理工大学 | Method for using residual stress gradient calibrating block |
| CN106964717A (en) * | 2016-07-11 | 2017-07-21 | 北京航空航天大学 | A kind of hydraulic expanding-forming residual stress homogenizer of large-scale looping mill rolling part |
| CN108287038A (en) * | 2017-10-19 | 2018-07-17 | 北京理工大学 | Residual stress gradient is distributed constant value test block design and application method |
| CN110514577A (en) * | 2019-08-20 | 2019-11-29 | 中国石油天然气集团有限公司 | For evaluating the experimental provision and method of tubing and casing crevice corrosion under stress state |
| CN111678806A (en) * | 2020-05-11 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | SHPB rock shear test device and method under normal stress condition |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837603A (en) * | 2014-02-28 | 2014-06-04 | 北京理工大学 | Method for using residual stress gradient calibrating block |
| CN103837603B (en) * | 2014-02-28 | 2017-02-15 | 北京理工大学 | Method for using residual stress gradient calibrating block |
| CN103822754A (en) * | 2014-03-12 | 2014-05-28 | 北京理工大学 | Pressure stress generating device for calibration of stress measurement system |
| CN103822754B (en) * | 2014-03-12 | 2015-12-30 | 北京理工大学 | A kind of compressive stress generating means for stress measurement system calibration |
| CN106964717A (en) * | 2016-07-11 | 2017-07-21 | 北京航空航天大学 | A kind of hydraulic expanding-forming residual stress homogenizer of large-scale looping mill rolling part |
| CN106964717B (en) * | 2016-07-11 | 2019-03-15 | 北京航空航天大学 | A kind of hydraulic expanding-forming residual stress homogenizer of large size looping mill rolling part |
| CN108287038A (en) * | 2017-10-19 | 2018-07-17 | 北京理工大学 | Residual stress gradient is distributed constant value test block design and application method |
| CN108287038B (en) * | 2017-10-19 | 2020-09-22 | 北京理工大学 | Residual stress gradient distribution fixed value test block |
| CN110514577A (en) * | 2019-08-20 | 2019-11-29 | 中国石油天然气集团有限公司 | For evaluating the experimental provision and method of tubing and casing crevice corrosion under stress state |
| CN111678806A (en) * | 2020-05-11 | 2020-09-18 | 江苏禹治流域管理技术研究院有限公司 | SHPB rock shear test device and method under normal stress condition |
| CN111678806B (en) * | 2020-05-11 | 2023-06-02 | 江苏禹治流域管理技术研究院有限公司 | SHPB rock shear test device and method under normal stress condition |
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Application publication date: 20140122 |