CN109374682A - A kind of monitoring device of fragile material crack initiation time - Google Patents
A kind of monitoring device of fragile material crack initiation time Download PDFInfo
- Publication number
- CN109374682A CN109374682A CN201811419418.0A CN201811419418A CN109374682A CN 109374682 A CN109374682 A CN 109374682A CN 201811419418 A CN201811419418 A CN 201811419418A CN 109374682 A CN109374682 A CN 109374682A
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- Prior art keywords
- fragile material
- strain
- crack initiation
- initiation time
- strain gauge
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/72—Investigating presence of flaws
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
A kind of monitoring device the invention discloses fragile material crack initiation time includes acoustic emission monitor(ing) device, strain monitoring device and temperature monitoring device.The present apparatus is a kind of device for collecting " sound emission ", " strain " and " temperature " three parameter combined monitorings, utilizes sound emission impact strength, the damage inactivation time of strain and the common accurate judgement fragile material of temperature curve.
Description
Technical field
The invention belongs to experimental technique device fields, and in particular to a kind of monitoring dress of fragile material crack initiation time
It sets.
Background technique
The damage, destruction or fail message of fragile material can be obtained using acoustic emission monitoring system, but in other electromechanics
In the complicated site environment of equipment operation, electromechanical equipment, headlamp or other test equipments would generally be to acoustic emission monitoring systems
Electromagnetic interference is generated, this interference signal influences analysis and judgement to fragile material damage, destruction or failure.
It causes to be difficult to accurate judgement fragile material based on single sound emission monitoring technology for complicated electromagnetic interference environment
Split destruction problem, it is therefore desirable to a kind of monitoring device of energy accurate judgement fragile material crack initiation time.
Summary of the invention
The object of the present invention is to provide the monitoring devices of energy accurate judgement fragile material crack initiation time a kind of.
The present invention takes following technical scheme:
A kind of monitoring device of fragile material crack initiation time, including acoustic emission monitor(ing) device, strain monitoring device and temperature
Monitoring device, the acoustic emission monitor(ing) device include acoustic emission sensor, preamplifier and sound emission collector, sound emission
Sensor is connected to the surface of fragile material, and preamplifier and sound emission collector are successively connect with acoustic emission sensor；It answers
Becoming monitoring device includes strain gauge and strain acquirement device, and the strain gauge is connected to the surface of fragile material, the strain
Collector is connect with strain gauge；The temperature monitoring device includes thermocouple and temperature sampler, the thermocouple connection
On the surface of fragile material, the temperature sampler is connect with thermocouple；The strain gauge and thermocouple is not overlapped.
In some specific embodiments of the invention, the acoustic emission sensor, strain gauge or thermocouple are adopted respectively
The surface that consistent bonded adhesives is bonded in fragile material is deformed with brittle material surface.
In some specific embodiments of the invention, the bonded adhesives is selected from instant drying adhesive or epoxy glue.
In some specific embodiments of the invention, the transverse center spacing of strain gauge and thermocouple is less than fragile material
The 1% of lateral length；The vertical center spacing of strain gauge and thermocouple is less than the 5% of fragile material vertical extension.
In some specific embodiments of the invention, the sample rate of the sound emission collector is not less than 5MHz, A/D
Precision is not less than 16.
In some specific embodiments of the invention, effective filtering bandwidth of the preamplifier is 20~
1000KHz。
In some specific embodiments of the invention, the strain acquirement device is connected using 1/4 bridge " three-wire system " method
Connect strain gauge.
In some specific embodiments of the invention, the sample rate phase of the strain acquirement device and temperature sampler
Together, and sample rate is not less than 1Hz.
In some specific embodiments of the invention, when method of the invention is suitable for detecting the crack initiation of fragile material
Between, the fragile material includes nonmetallic composite, such as polymer bonding explosive.
Compared with prior art, the present invention have it is below the utility model has the advantages that
The present apparatus includes acoustic emission monitor(ing) device, strain monitoring device and temperature monitoring device, be a kind of collection " sound emission ",
The device of " strain " and " temperature " three parameter combined monitorings, it is jointly quasi- using sound emission impact strength, strain and temperature curve
Really judge the damage inactivation time of fragile material.
The present apparatus installs electroheat pair near strain gauge, excludes tested fragile material temperature and quickly change to cause strain bent
The erroneous judgement of line acutely shaken.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the monitoring device of fragile material crack initiation time of the invention；
Fig. 2 is the position view of strain gauge and thermocouple；
Fig. 3 is the signal schematic representation of the fragile material crack initiation of one embodiment of the invention.
1- fragile material；11- acoustic emission sensor；12- preamplifier；13- sound emission collector；21- strain gauge；
22- strain acquirement device；31- thermocouple；32- temperature sampler.
Specific embodiment
Below with reference to the drawings and specific embodiments of the invention, the present invention will be further explained and explanation.
In conjunction with attached drawing 1, a kind of detection device of fragile material crack initiation time, including acoustic emission monitor(ing) device, strain monitoring
Device and temperature monitoring device, the acoustic emission monitor(ing) device include acoustic emission sensor 11,12 harmony of preamplifier hair
Penetrate collector 13, acoustic emission sensor 11 be connected to the surface of fragile material 1, preamplifier 12 and sound emission collector 13 according to
It is secondary to be connect with acoustic emission sensor 11；Strain monitoring device includes strain gauge 21 and strain acquirement device 22, the strain gauge 21
It is connected to the surface of fragile material 1, the strain acquirement device 22 is connect with strain gauge 21；The temperature monitoring device includes
Thermocouple 31 and temperature sampler 32, the thermocouple 31 are connected to the surface of fragile material 1, the temperature sampler 32
It is connect with thermocouple 31；The strain gauge 21 and thermocouple 31 is not overlapped.
In some embodiments of the invention, the acoustic emission sensor 11, strain gauge 21 or thermocouple 31 divide
The surface that consistent bonded adhesives is bonded in fragile material 1 Cai Yong not be deformed with brittle material surface.The bonded adhesives is dry selected from wink
Glue or epoxy glue, the bonded adhesives can be according to environmental selections, to ensure acoustic emission sensor 11, strain gauge 21 or thermocouple 31
It is consistent with the surface deformation of fragile material 1.
Quickly change to exclude tested fragile material temperature and cause the erroneous judgement acutely shaken of strain curve, is straining
Thermocouple 31 is installed near meter 21；And in order to avoid thermocouple 31 causes strain gauge 21 to generate measurement error, the two cannot be weighed
It is folded.Referring to fig. 2, the transverse center spacing of strain gauge 21 and thermocouple 31 is less than the position view of strain gauge 21 and thermocouple 31
The 1% of fragile material lateral length；The vertical center spacing of strain gauge 21 and thermocouple 31 is less than fragile material vertical extension
5%.In some embodiments of the invention, thermocouple is small circle, and strain is calculated as regular rectangular shape.
In some embodiments of the invention, the sample rate of the sound emission collector 13 is not less than 5MHz, A/D
Precision is not less than 16.Such as in some embodiments of the invention, using Express-8 (American Physical acoustics company)
The sound emission collector of model.
In some embodiments of the invention, effective filtering bandwidth of the preamplifier 12 be 20~
1000KHz.Such as in some embodiments of the invention, using the preposition of 2/4/6 (American Physical acoustics company) model
Amplifier.
In some embodiments of the invention, using the voice sending sensor of R15 (American Physical acoustics company) model
Device 11.
In some embodiments of the invention, the strain acquirement device 22 is connected using 1/4 bridge " three-wire system " method
Connect strain gauge 21.In some embodiments of the invention, using the MX1615B model strain acquirement device of HBM company of Germany
22 and Zhonghang Electrical Measuring Instrument Co Ltd 2AA type strain gauge.
In some embodiments of the invention, the sample rate phase of the strain acquirement device 22 and temperature sampler 32
Together, and sample rate is not less than 1Hz.In some specific embodiments in the present invention, using the 2680A type of Fluke company of the U.S.
Temperature sampler 32.
Test case 1:
Acoustic emission sensor, strain gauge and thermocouple are pasted on polymer bonding explosive according to Fig. 1 schematic diagram, then
The part is integrally put into temperature control box.Temperature shock is carried out to fragile material by temperature control box, keeps fragile material crack initiation broken
It is bad.Using the fragile material crack initiation time of the invention detection device detection fragile material the crack initiation time, obtain " sound emission ",
The tri-consult volume figure of " strain " and " temperature " is detailed in Fig. 3, and abscissa is the time, and ordinate is " sound emission ", " strain " and " temperature "
Amplitude, unit be respectively as follows: dB, μ ε, DEG C.From figure 3, it can be seen that no sound emission is hit when material surface temperature remains unchanged
Event；When test temperature, which needs, to be reduced, the high power motor in temperature-controlled cabinet starts, and has multiple sound caused by electromagnetic interference
Emit impact event, if only can judge by accident using sound emission impact event as the foundation of judgement material crack initiation and think the time
For the material crack initiation time.When the real crack initiation of tested fragile material, it may appear that multiple sound emission impact events, while strain curve
It shakes, then can accurately think at this time for the material crack initiation time.
" one embodiment " for being spoken of in the present specification, " another embodiment ", " embodiment " etc., refer to combining
Specific features, structure or the feature of embodiment description are included at least one embodiment generally described herein.
It is not centainly to refer to the same embodiment that statement of the same race, which occur, in multiple places in the description.Furthermore, it is understood that in conjunction with any
When embodiment describes a specific features, structure or feature, what is advocated is that this spy is realized in conjunction with other embodiments
Sign, structure or feature are also fallen within the scope of the present invention.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementations, these modifications and implementations will fall in this Shen
It please be within disclosed scope and spirit.More specifically, disclose in the application, drawings and claims in the range of, can
With the building block and/or a variety of variations and modifications of layout progress to theme combination layout.In addition to building block and/or layout
Outside the variations and modifications of progress, to those skilled in the art, other purposes also be will be apparent.
Claims (8)
1. a kind of detection device of fragile material crack initiation time, it is characterised in that filled including acoustic emission monitor(ing) device, strain monitoring
It sets and temperature monitoring device, the acoustic emission monitor(ing) device includes acoustic emission sensor (11), preamplifier (12) harmony
Emit collector (13), acoustic emission sensor (11) is connected to the surface of fragile material (1), preamplifier (12) and sound emission
Collector (13) is successively connect with acoustic emission sensor (11)；Strain monitoring device includes strain gauge (21) and strain acquirement device
(22), the strain gauge (21) is connected to the surface of fragile material (1), the strain acquirement device (22) and strain gauge (21)
Connection；The temperature monitoring device includes thermocouple (31) and temperature sampler (32), and the thermocouple (31) is connected to
The surface of fragile material (1), the temperature sampler (32) are connect with thermocouple (31)；The strain gauge (21) and thermoelectricity
Even (31) are not overlapped.
2. the detection device of fragile material crack initiation time according to claim 1, it is characterised in that the sound emission passes
Sensor (11), strain gauge (21) or thermocouple (31) be respectively adopted with brittle material surface deform consistent bonded adhesives be bonded in it is crisp
The surface of property material (1).
3. the detection device of fragile material crack initiation time according to claim 2, it is characterised in that the bonded adhesives is selected from
Instant drying adhesive or epoxy glue.
4. the detection device of fragile material crack initiation time according to claim 1, it is characterised in that strain gauge (21) and heat
The transverse center spacing of galvanic couple (31) is less than the 1% of fragile material (1) lateral length；Strain gauge (21) and thermocouple (31) it is perpendicular
It is less than the 5% of fragile material (1) vertical extension to center spacing.
5. the detection device of fragile material crack initiation time according to claim 1, it is characterised in that the sound emission is adopted
The sample rate of storage (13) is not less than 5MHz, and A/D precision is not less than 16.
6. the detection device of fragile material crack initiation time according to claim 1, it is characterised in that the preposition amplification
Effective filtering bandwidth of device (12) is 20~1000KHz.
7. the detection device of fragile material crack initiation time according to claim 1, it is characterised in that the strain acquirement
Device (22) is using 1/4 bridge " three-wire system " method connection strain gauge (21).
8. the detection device of fragile material crack initiation time according to claim 1, it is characterised in that the strain acquirement
Device (22) is identical with the sample rate of temperature sampler (32), and sample rate is not less than 1Hz.
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| CN201811419418.0A CN109374682B (en) | 2018-11-26 | 2018-11-26 | Monitoring device for cracking time of brittle material |
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|---|---|---|---|
| CN201811419418.0A CN109374682B (en) | 2018-11-26 | 2018-11-26 | Monitoring device for cracking time of brittle material |
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| CN109374682A true CN109374682A (en) | 2019-02-22 |
| CN109374682B CN109374682B (en) | 2023-08-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114813964A (en) * | 2022-04-24 | 2022-07-29 | 中国工程物理研究院化工材料研究所 | Method for deciding crack initiation damage of brittle material structural part by adopting time domain information |
| CN116539413A (en) * | 2023-06-27 | 2023-08-04 | 中国矿业大学(北京) | Rock characteristic stress determining method based on acoustic emission counting nonlinear evolution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114813964A (en) * | 2022-04-24 | 2022-07-29 | 中国工程物理研究院化工材料研究所 | Method for deciding crack initiation damage of brittle material structural part by adopting time domain information |
| CN114813964B (en) * | 2022-04-24 | 2023-08-22 | 中国工程物理研究院化工材料研究所 | Method for deciding cracking damage of brittle material structural member by adopting time domain information |
| CN116539413A (en) * | 2023-06-27 | 2023-08-04 | 中国矿业大学(北京) | Rock characteristic stress determining method based on acoustic emission counting nonlinear evolution |
| CN116539413B (en) * | 2023-06-27 | 2023-11-07 | 中国矿业大学(北京) | Rock characteristic stress determining method based on acoustic emission counting nonlinear evolution |
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| CN109374682B (en) | 2023-08-22 |
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