CN106645425A - Online residual stress nondestructive detection system and method based on acoustic emission technique - Google Patents
Online residual stress nondestructive detection system and method based on acoustic emission technique Download PDFInfo
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- CN106645425A CN106645425A CN201710088791.1A CN201710088791A CN106645425A CN 106645425 A CN106645425 A CN 106645425A CN 201710088791 A CN201710088791 A CN 201710088791A CN 106645425 A CN106645425 A CN 106645425A
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- acoustic emission
- residual stress
- rms
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- nondestructive detection
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title abstract description 30
- 238000013481 data capture Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000009659 non-destructive testing Methods 0.000 description 7
- 230000006378 damage Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910001204 A36 steel Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005542 laser surface treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010297 mechanical methods and process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000001683 neutron diffraction Methods 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 210000001260 vocal cord Anatomy 0.000 description 1
- 238000002424 x-ray crystallography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
Abstract
The invention relates to the technical field of nondestructive detection, and particularly relates to an online residual stress nondestructive detection system and method based on an acoustic emission technique. The online residual stress nondestructive detection system based on the acoustic emission technique is characterized by comprising an upper computer system, a data acquisition card, a main amplifier, a front amplifier and an acoustic emission sensor. The online residual stress nondestructive detection method based on the acoustic emission technique is characterized by comprising the following steps: presetting a function expression of a sigma r and RMS relation in a residual stress sigma r (MPa) and RMS (V) relationship setting module; acquiring, by an acoustic emission signal acquisition module in the upper computer system, an acoustic emission signal acquired by the data acquisition card; acquiring, by a valid value voltage acquisition module in the upper computer system, RMS in the acoustic emission signal; and substituting, by the upper computer system, an acquired valid value voltage into the function expression of the sigma r and RMS relation, and calculating a residual stress of a workpiece. The method has the advantage that the online nondestructive detection can be performed on the residual stress.
Description
Technical field
The present invention relates to technical field of nondestructive testing, refers in particular to a kind of online lossless inspection of residual stress based on acoustic emission
Examining system and method.
Technical background
At present the detection method of residual stress mainly includes：Mechanical Method and physical measure.
(1) Mechanical Method
Mechanical Method mainly includes orifice method, slitting method, grooving method etc..Mechanical Method detection residual stress needs to discharge workpiece
Stress, this is accomplished by carrying out workpiece the separation or segmentation of local, so that certain damage or destruction is caused to workpiece,
But mechanical law theory is perfect, technology maturation, it is widely used in detecting at the scene at present, wherein especially the destruction of orifice method is most
It is little, it is most widely used, and American Society Testing and Materials (ASTM) has formulated the standard that orifice method tests residual stress
ASTM E 837-08, are defined as the residual stress test method of standard.
(2) physical measure
Physical measure mainly includes x-ray method, neutron diffraction method, supercritical ultrasonics technology etc..X-ray method detection workpiece is remaining should
Power is based on Elasticity and X-ray crystallography is theoretical.When there is residual stress in crystalline material, elasticity is certainly existed
Strain is corresponded, and causes the deformation of material regional area, and causes the relative position between material internal atom to become
Change, so as to reflect on X ray diffracting spectrum, by analyzing these diffraction informations, you can to determine that material internal is remaining
The size of stress.The general principle of neutron diffraction method detection workpiece residual stress is consistent with x-ray method, and simply neutron is worn
Thoroughly many big compared to X-ray of depth, can be used to the residual stress of test piece deeper.Supercritical ultrasonics technology detection workpiece is remaining
The principle of stress is built upon on the basis of Vocal cord injection, i.e., using by the sound birefringent phenomenon in stress material detecting work
The size of residual stress in part.These methods belong to nondestructive determination, do not result in the damage or destruction of workpiece.
In recent years, with the fast development of modern industrial technology, a collection of new residual stress detection method has also been emerged in large numbers, such as
Nanoindentation, scanning electron sonomicroscope method, Raman spectroscopy etc..But these detection methods are due to the height of equipment cost
It is high, not perfect enough, the inreal application for moving towards reality of complicated condition and the theory of testing.The present invention proposes a kind of based on sound
The online nondestructive detection system of residual stress of lift-off technology and method, belong to lossless residual stress detection method.So-called remnants
The online Non-Destructive Testing of stress refers to workpiece and carries out real-time detection to residual stress during processing and manufacturing.
The content of the invention
In order to carry out online Non-Destructive Testing to the residual stress of workpiece, the present invention proposes a kind of based on acoustic emission
The online nondestructive detection system of residual stress and method.
The online nondestructive detection system of residual stress based on acoustic emission, it is characterised in that：Including master system, number
According to capture card, main amplifier, preamplifier, acoustic emission sensor；Acoustic emission sensor is arranged on workpiece, voice sending sensor
The output channel of device is connected with the input channel of preamplifier, and the output channel of preamplifier is led to the input of main amplifier
Road connects, and the output channel of main amplifier is connected with the input channel of data collecting card, the output channel of data collecting card with it is upper
Position machine system connection.
Master system includes obtaining the acoustic emission signal acquisition module of the acoustic emission signal that data collecting card is collected, and obtains
Take the RMS voltage acquisition module of the RMS voltage (RMS) of acoustic emission signal, residual stress σr(MPa) and RMS (V) between
Correlation setup module.
The online lossless detection method of residual stress based on acoustic emission, it is characterised in that：In residual stress σr(MPa)
The preset σ in correlation setup module between RMS (V)rThe function expression of correlation between RMS；Master system
In acoustic emission signal acquisition module obtain the acoustic emission signal that collects of data collecting card；Virtual value electricity in master system
Pressure acquisition module obtains the RMS of acoustic emission signal；The RMS voltage for obtaining is substituted into σ by master systemrBetween RMS mutually
The function expression of relation, calculates the residual stress of workpiece.
The present invention technology design be：By master system, data collecting card, main amplifier, preamplifier and sound
Emission sensor is constituted based on the online nondestructive detection system of residual stress of acoustic emission；In residual stress σrAnd RMS (MPa)
(V) preset σ in correlation setup module betweenrThe function expression of correlation between RMS；Master system will be obtained
RMS voltage substitute into σrThe function expression of correlation between RMS, calculates the residual stress of workpiece, so as to realize
Online Non-Destructive Testing is carried out to residual stress.
The invention has the beneficial effects as follows:
1st, acoustic emission sensor can obtain the acoustic emission signal in work pieces process manufacture process, further obtain sound emission
The RMS voltage of signal, and the quantification functional relation set up between RMS voltage and residual stress, can realize to residual
Residue stress carries out online Non-Destructive Testing.
2nd, master system can automatically obtain the RMS voltage of acoustic emission signal and acoustic emission signal, realize to remnants
Stress carries out online Non-Destructive Testing, without the need for manually operated, reduces workload, improves operating efficiency.
Description of the drawings
Residual stress online nondestructive detection system schematic diagrames of the Fig. 1 based on acoustic emission.
Laser Surface Treatment residual stress online nondestructive detection system schematic diagrames of the Fig. 2 based on acoustic emission.
Correlation between Fig. 3 residual stress and RMS voltage.
Specific embodiment
Referring to the drawings, the present invention is further illustrated：
The online nondestructive detection system of residual stress based on acoustic emission, it is characterised in that：Including master system, number
According to capture card, main amplifier, preamplifier, acoustic emission sensor；Acoustic emission sensor is arranged on workpiece, voice sending sensor
The output channel of device is connected with the input channel of preamplifier, and the output channel of preamplifier is led to the input of main amplifier
Road connects, and the output channel of main amplifier is connected with the input channel of data collecting card, the output channel of data collecting card with it is upper
Position machine system connection.
Master system includes obtaining the acoustic emission signal acquisition module of the acoustic emission signal that data collecting card is collected, and obtains
Take the RMS voltage acquisition module of the RMS voltage (RMS) of acoustic emission signal, residual stress σr(MPa) and RMS (V) between
Correlation setup module.
The online lossless detection method of residual stress based on acoustic emission, it is characterised in that：In residual stress σr(MPa)
The preset σ in correlation setup module between RMS (V)rThe function expression of correlation between RMS；Master system
In acoustic emission signal acquisition module obtain the acoustic emission signal that collects of data collecting card；Virtual value electricity in master system
Pressure acquisition module obtains the RMS of acoustic emission signal；The RMS voltage for obtaining is substituted into σ by master systemrBetween RMS mutually
The function expression of relation, calculates the residual stress of workpiece.
In order to obtain residual stress σr(MPa) ASTM A36 carbon structural steels are entered by the correlation and between RMS (V)
Row Laser Surface Treatment, using the online nondestructive detection system of the residual stress based on acoustic emission proposed by the present invention, obtains
Acoustic emission signal during ASTM A36 carbon structural steels Laser Surface Treatments, the RMS voltage in master system is obtained
Module obtains the RMS of acoustic emission signal.Changing the technological parameter of ASTM A36 carbon structural steels Laser Surface Treatments can obtain
Corresponding acoustic emission signal, while the RMS of corresponding acoustic emission signal can be obtained, further obtains phase using orifice method
The residual stress of corresponding ASTM A36 carbon structural steels.Residual stress σ is gone out using Origin Software on DrawingrAnd RMS (MPa)
(V) relation between (see Fig. 3).From Fig. 3 it is found that residual stress σr(MPa) have and RMS (V) between stronger linear
Relation, residual stress σ set up using the curve matching function of Origin softwaresr(MPa) function representation and between RMS (V)
Formula is σr=2248.30-4658190 × RMS, shows by the effective of the acoustic emission signal in acquisition work pieces process manufacture process
Threshold voltage (RMS), it is possible to carry out real-time detection to the residual stress in work pieces process manufacture process, that is, realize remaining to workpiece
Stress carries out online Non-Destructive Testing.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, the protection of the present invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (3)
1. the online nondestructive detection system of residual stress of acoustic emission is based on, it is characterised in that：Including master system, data
Capture card, main amplifier, preamplifier, acoustic emission sensor；Acoustic emission sensor is arranged on workpiece, acoustic emission sensor
Output channel be connected with the input channel of preamplifier, the output channel of preamplifier and the input channel of main amplifier
Connection, the output channel of main amplifier is connected with the input channel of data collecting card, the output channel of data collecting card with it is upper
Machine system connects.
2. the online nondestructive detection system of residual stress of acoustic emission is based on as claimed in claim 1, it is characterised in that：On
Position machine system includes obtaining the acoustic emission signal acquisition module of the acoustic emission signal that data collecting card is collected, and obtains sound emission letter
Number RMS voltage (RMS) RMS voltage acquisition module, residual stress σr(MPa) correlation sets and RMS (V) between
Put module.
3. the online lossless detection method of residual stress of acoustic emission is based on, it is characterised in that：In residual stress σr(MPa) with
Preset σ in correlation setup module between RMS (V)rThe function expression of correlation between RMS；In master system
Acoustic emission signal acquisition module obtain the acoustic emission signal that collects of data collecting card；RMS voltage in master system
Acquisition module obtains the RMS of acoustic emission signal；The RMS voltage for obtaining is substituted into σ by master systemrMutually close between RMS
The function expression of system, calculates the residual stress of workpiece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710088791.1A CN106645425A (en) | 2017-02-20 | 2017-02-20 | Online residual stress nondestructive detection system and method based on acoustic emission technique |
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| CN201710088791.1A CN106645425A (en) | 2017-02-20 | 2017-02-20 | Online residual stress nondestructive detection system and method based on acoustic emission technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108195941A (en) * | 2017-12-29 | 2018-06-22 | 郑州智谷工业技术有限公司 | A kind of rock fracture sound emission on-line monitoring system |
| CN111650283A (en) * | 2020-06-17 | 2020-09-11 | 上海海事大学 | Method for positioning residual stress peak value based on acoustic emission technology |
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| US4831880A (en) * | 1988-08-08 | 1989-05-23 | The Regents Of The University Of California | Method and apparatus for determining vertical density profiles in wood composites, using acoustic emission |
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| US4831880A (en) * | 1988-08-08 | 1989-05-23 | The Regents Of The University Of California | Method and apparatus for determining vertical density profiles in wood composites, using acoustic emission |
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| CN101178384A (en) * | 2007-12-05 | 2008-05-14 | 南京航空航天大学 | Composite geomagnetic survey system based on barkhausen noise and metal magnetic memory |
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| CN108195941A (en) * | 2017-12-29 | 2018-06-22 | 郑州智谷工业技术有限公司 | A kind of rock fracture sound emission on-line monitoring system |
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| CN111650283B (en) * | 2020-06-17 | 2023-02-24 | 上海海事大学 | Method for positioning residual stress peak value based on acoustic emission technology |
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