CN106225970A - The pasting method of detection bending residual stress - Google Patents
The pasting method of detection bending residual stress Download PDFInfo
- Publication number
- CN106225970A CN106225970A CN201610690960.4A CN201610690960A CN106225970A CN 106225970 A CN106225970 A CN 106225970A CN 201610690960 A CN201610690960 A CN 201610690960A CN 106225970 A CN106225970 A CN 106225970A
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- China
- Prior art keywords
- stress
- foil gauge
- detection
- patch location
- residual stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of pasting method detecting bending residual stress, including: choose the patch location of detection workpiece, by strain gauge adhesion in patch location；Detection workpiece is fixed on forcing press, foil gauge is connected to stress ga(u)ge by wire, detect and record initial value；Detect and record stress value during detection workpiece surrender, detection workpiece is started stress value when deforming as bending stresses.The present invention have found the relatedness between stress value and bending residual stress, H profile steel deformation can be caused to provide method for finding out stress value when much.
Description
Technical field
The present invention relates to a kind of detection method, specifically, relate to a kind of pasting method detecting bending residual stress.
Background technology
The residual stress test of H profile steel does not has standard, as residual stress much time just can cause bending, relevant report
Accuse.And bend yield strength noted cannot be measured on current tensile testing machine, longitudinal yield strength can only be tested, by surrender
Intensity can estimate residual-stress value.
Summary of the invention
Technical problem solved by the invention is to provide a kind of pasting method detecting bending residual stress, have found stress
Relatedness between value and bending residual stress.
Technical scheme is as follows:
A kind of pasting method detecting bending residual stress, including:
Choose the patch location of detection workpiece, by strain gauge adhesion in patch location；
Detection workpiece is fixed on forcing press, foil gauge is connected to stress ga(u)ge by wire, detect and record initial
Value；
Detect and record stress value during detection workpiece surrender, detection workpiece is started stress value when deforming as bending
Residual-stress value.
Further: to select stress concentration point as described patch location.
Further: before pasting described foil gauge, with grinder buffing and polish described patch location, clean institute with cotton ball soaked in alcohol
State the surface of patch location, with glue described strain gauge adhesion in described patch location.
Further: to intercept one section of H profile steel as described detection workpiece, by web and the central point on the edge of a wing of described H profile steel
As described patch location.
Further: the silk length direction of described foil gauge is consistent with described H profile steel length direction.
Further: being fastened with glue by binding post at described foil gauge 3mm, the wiring point of described binding post is the most corresponding
Become sheet wire direction, with scolding tin, described binding post is connected with described foil gauge.
Further: to determine the length intercepting H profile steel according to the size of pressure test machine worktable, at the center of described web
Point pastes a piece of described foil gauge, and the central point outside two described edges of a wing respectively pastes a piece of described foil gauge.
Further: when the edge of a wing two that press ram has just contacted described H profile steel is surveyed, stress ga(u)ge does not has reading, stress
Value is zero；When press pressure increases, web stress starts to be gradually increased, and described flange stress value is zero；When forcing press increases
When being added to certain pressure, described web stress is gradually increased, and described flange stress is also gradually increased, when described H profile steel starts
During deformation, stress value now is bending residual-stress value.
The technology of the present invention effect includes:
1, by the present invention, have found the relatedness between stress value and bending residual stress, for finding out stress value many
H profile steel deformation can be caused time big to provide method；Formulation for H profile steel testing standard from now on provides foundation.At not mark
In the case of standard, it is also necessary to have corresponding method, to analyze fracture, the reason of bending that product causes because of residual stress, meet
Company produces and the needs of scientific research.
2, according to the various method of testing of residual stress, based on internationally recognized foil gauge method of testing, bonded products
Force-bearing situation and shape, select different patch location and direction, test product, understand the stress distribution situation of product,
Find stress concentration point, select patch location.
3, suitable spread uses.
The present invention is applicable not only to H profile steel, is also applied for other kinds of steel detection bending residual stress.
Accompanying drawing explanation
Fig. 1 is H profile steel patch location schematic diagram in the present invention.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with the accompanying drawing of the present invention, right
Technical scheme carries out clear, complete description, and based on the embodiment in the application, those of ordinary skill in the art exist
Other the similar embodiment obtained on the premise of not making creative work, all should belong to the scope of the application protection.
The pasting method of detection bending residual stress, comprises the steps:
Step 1: choose the patch location of detection workpiece, foil gauge 3 is pasted onto patch location；
As it is shown in figure 1, be H profile steel patch location schematic diagram in the present invention.
The factor affecting testing result mainly has: the knot of the selection of foil gauge 3, patch location, surface of the work and foil gauge 3
Close tightness degree.
1, the selection of foil gauge 3.
Foil gauge 3 is divided into monolithic, biplate, special shape by structure；It is divided into metal type build (wire form, foil, thin by material
Membranous type), semiconductor-type build (film type, diffused, extension type, PN junction)；It is divided into high temperature strain foil, low temperature by using environment
Foil gauge, large compressive strain sheet, magnetic field foil gauge, under water foil gauge.
The specification of the foil gauge 3 that the present invention selects is 3mm × 3mm, model BX-120-3AA.
The present invention uses for reference rail standard GB2585-2007 " railway hot rolled rail " and European standard prEN13674-1 " ferrum
Rail road heavy rail " in, foil gauge length 3mm is tested, and other specification result is different.
2, the patch location of foil gauge 3 is extremely important to testing result.
The present invention select stress concentration point as patch location.As a example by H profile steel, the central point of workpiece is as paster position
Put stickup foil gauge 3, leave central point nonsensical to testing result.It is experimentally confirmed, when central point starts plastic deformation,
Other local stress value is also not changed in, as at central point 10mm.
3, foil gauge 3 to be combined closely with surface of the work.
Paste before foil gauge, with grinder buffing and polish patch location, clean its surface with cotton ball soaked in alcohol, use 406 glue
Foil gauge 3 is bonded at patch location, and the silk length direction of foil gauge 3 is consistent with H profile steel length direction.Touching with medical proof fabric should
Become sheet 3, prevent from colliding with.
Binding post is also pasted onto the position at foil gauge wire 3mm with 406 glue, and binding post two wiring point is just to strain
Sheet wire direction, connects binding post with scolding tin with foil gauge, it is therefore an objective to prevent detection during, foil gauge wire short circuit and
Break, be used for connecting equipment wire.
As a example by H profile steel, after considering the factor affecting testing result, in order to measure H profile steel bending residual stress, root
According to the size of pressure test machine worktable, intercept one section of H profile steel as detection workpiece, using central point as patch location, at abdomen
Central point 1 foil gauge 3 of patch of plate 1, the central point outside 1 liang of side wing edge 2 of web respectively pastes 1 foil gauge 3.
Step 2: be fixed on forcing press by detection workpiece, is connected to stress ga(u)ge by foil gauge 3 by wire, detects and remembers
Record initial value；
Initial value be pasted foil gauge 3 after, the numerical value measured when not having a loading stress.
As a example by H profile steel, making the web 1 of H profile steel be directed at press ram, foil gauge 3 is connected with stress ga(u)ge by wire；
Open stress ga(u)ge, recall application program, the initial value of detection workpiece.
Step 3: detect and record stress value during detection workpiece surrender, detection workpiece is started stress value when deforming and makees
For bending residual-stress value.
After having surveyed initial value, stress ga(u)ge is measured button and is opened with forcing press start button simultaneously, and measurement starts, when seeing H
During the obvious plastic deformation of shaped steel, turning off forcing press and stress ga(u)ge start button, stress ga(u)ge record also draws stress curve automatically, reads
Go out stress value when surrendering, measure the arm of force.
By the detection that links online, from 24 groups of samples of test it is concluded that, when the unilateral arm of force is 175mm, web 1
Residual stress is 362MPa, during the stress value 250MPa of the edge of a wing 2, causes H profile steel to start deformation.Can from our patch location
Going out, when web 1 just starts to deform, the edge of a wing 2 is not changed in, and central point is also the position of press ram, when reaching
During 362MPa, the edge of a wing 2 reaches 250MPa, and the change of other patch location stress value is the least, when numerical value increases, and H profile steel mistake
Degree deformation, so other position paster has little significance.
When press ram has just contacted the survey of 2 liang of the H profile steel edge of a wing, stress ga(u)ge does not has reading, and stress value is zero.Work as pressure
When machine pressure increases, web 1 stress starts to be gradually increased, and the edge of a wing 2 stress value is zero；When forcing press increases to certain pressure
Time, web 1 stress is gradually increased, and the edge of a wing 2 stress is also gradually increased, and when detecting workpiece and starting to deform, stress value now is
Bending residual-stress value.
By the present invention, for when residual stress is much in H profile steel, bending could be produced and provide data, make inspection in the future
Survey has had foundation, helpful to standard formulation in the future.
Although moreover, it will be appreciated that this specification is been described by according to embodiment, but the most each embodiment only wraps
Containing an independent technical scheme, this narrating mode of description is only that for clarity sake those skilled in the art should
Description can also be formed those skilled in the art through appropriately combined as an entirety, the technical scheme in each embodiment
May be appreciated other embodiments.
Claims (8)
1. detect a pasting method for bending residual stress, including:
Choose the patch location of detection workpiece, by strain gauge adhesion in patch location；
Detection workpiece is fixed on forcing press, foil gauge is connected to stress ga(u)ge by wire, detect and record initial value；
Detect and record stress value during detection workpiece surrender, detection workpiece is started stress value when deforming remaining as bending
Stress value.
2. detection bends the pasting method of residual stress as claimed in claim 1, it is characterised in that: select stress concentration point conduct
Described patch location.
3. detection bends the pasting method of residual stress as claimed in claim 1, it is characterised in that: before pasting described foil gauge,
With grinder buffing and polish described patch location, clean the surface of described patch location with cotton ball soaked in alcohol, answer described with glue
Become sheet and be pasted onto described patch location.
4. the pasting method of detection bending residual stress as described in any one of claims 1 to 3, it is characterised in that: intercept one section of H
Shaped steel is as described detection workpiece, using the web of described H profile steel and the central point on the edge of a wing as described patch location.
5. detection bends the pasting method of residual stress as claimed in claim 4, it is characterised in that: the filament length degree of described foil gauge
Direction is consistent with described H profile steel length direction.
6. detection bends the pasting method of residual stress as claimed in claim 3, it is characterised in that: binding post is fastened with glue
At described foil gauge 3mm, the wiring point of described binding post just to foil gauge wire direction, with scolding tin described binding post with
Described foil gauge connects.
7. detection bends the pasting method of residual stress as claimed in claim 4, it is characterised in that: work according to pressure testing machine
The size of platform determines the length intercepting H profile steel, and the central point at described web pastes a piece of described foil gauge, outside two described edges of a wing
The central point of side respectively pastes a piece of described foil gauge.
8. detection bends the pasting method of residual stress as claimed in claim 4, it is characterised in that: when press ram just connects
When the edge of a wing two of tactile described H profile steel is surveyed, stress ga(u)ge does not has reading, and stress value is zero；When press pressure increases, web stress
Starting to be gradually increased, described flange stress value is zero；When forcing press increases to certain pressure, described web stress gradually increases
Greatly, described flange stress is also gradually increased, and when described H profile steel starts to deform, stress value now is bending residual-stress value.
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| CN201610690960.4A CN106225970A (en) | 2016-08-18 | 2016-08-18 | The pasting method of detection bending residual stress |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356225A (en) * | 2017-04-18 | 2017-11-17 | 华侨大学 | A kind of installation method for building foil gauge built in test specimen deriving |
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| JPH01131422A (en) * | 1987-11-17 | 1989-05-24 | Mitsubishi Heavy Ind Ltd | Detecting method for loosed bolt |
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| CN1979161A (en) * | 2005-11-30 | 2007-06-13 | 宝山钢铁股份有限公司 | Method for detecting residual strain of thermal-continuous-rolled high-strength steel plate |
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| CN104483047A (en) * | 2014-12-23 | 2015-04-01 | 内蒙古包钢钢联股份有限公司 | Surface-mounting method for testing residual bending stress of H-shaped steel |
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|---|---|---|---|---|
| JPH01131422A (en) * | 1987-11-17 | 1989-05-24 | Mitsubishi Heavy Ind Ltd | Detecting method for loosed bolt |
| CN1375689A (en) * | 2001-03-16 | 2002-10-23 | 中国科学院金属研究所 | Residual stress measuring method |
| CN1979161A (en) * | 2005-11-30 | 2007-06-13 | 宝山钢铁股份有限公司 | Method for detecting residual strain of thermal-continuous-rolled high-strength steel plate |
| CN102147301A (en) * | 2010-12-28 | 2011-08-10 | 湖南大学 | Nondestructive testing method of hard alloy anvil |
| 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 |
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| CN104483047A (en) * | 2014-12-23 | 2015-04-01 | 内蒙古包钢钢联股份有限公司 | Surface-mounting method for testing residual bending stress of H-shaped steel |
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| CN107356225A (en) * | 2017-04-18 | 2017-11-17 | 华侨大学 | A kind of installation method for building foil gauge built in test specimen deriving |
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Application publication date: 20161214 |