CN103743335B - A kind of ring dynamic strain measurement method and device greatly - Google Patents
A kind of ring dynamic strain measurement method and device greatly Download PDFInfo
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- CN103743335B CN103743335B CN201310737647.8A CN201310737647A CN103743335B CN 103743335 B CN103743335 B CN 103743335B CN 201310737647 A CN201310737647 A CN 201310737647A CN 103743335 B CN103743335 B CN 103743335B
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Abstract
The present invention relates to a kind of ring dynamic strain measurement method and device greatly, one kind is proposed using B alloy wire as sensitive conductive material, pulsed constant current supply is used as preposition instrument, ring dynamic big strain gauge means of the oscillograph as grapher, in solving the problems, such as the big strain measurement of ring dynamic, strain ga(u)ge is easily peeling-off by the effect of vertical stress ripple, the measurement apparatus can realize that the rise time is more than 120 μ s, peak value strains peak error and is less than 5% up to the 20% big strain measurement of ring dynamic.
Description
Technical field
The invention belongs to strain measurement method and device, are related to the measuring method and device of a kind of big strain of ring dynamic,
More particularly in a kind of explosion mechanics fields of measurement container or housing the big strain measurement method of ring dynamic and device.
Background technology
In explosion mechanics field, strain measurement is extremely common, is also very important stress analysis means, and it is material
The important evidence of the multinomial work such as material performance evaluation, structure design, safety custody.Strain ga(u)ge is various strain measurement modes
Middle development is earliest, the metering system being most widely used, during which has extensive suitable environment, including space, water, soil it is medium,
It is also applied for various measurement objects, including metal, glass, timber, plastics, ground etc..
At present, strain ga(u)ge can measure strain value under the conditions of quasistatic and be up to 20%, and under dynamic condition, especially
When stress wave and vertical deformation generation direction, it is only capable of measuring 2%.During more than 2%, strain gauge vertical stress ripple effect under with quilt
Survey and will occur peeling off and coming off between object, it is impossible to realize effectively measuring.
For this reason, it may be necessary under a kind of dynamic condition measurable Large strain value strain gauge means.
The content of the invention
The present invention proposes one kind using B alloy wire as sensitive conductive material, and pulsed constant current supply is used as preposition instrument, oscillography
Ring dynamic big strain gauge means of the device as grapher, in solving the big strain measurement of ring dynamic, strain ga(u)ge holds
Easily acted on and peeling-off problem by vertical stress ripple, the measurement apparatus can realize the rise time more than 120 μ s, and peak value reaches
The 20% big strain measurement of ring dynamic, strain peak error are less than 5%.
The present invention technical solution be：
A kind of ring dynamic strain measurement method greatly, which is characterized in that：Comprise the following steps：
1】In the outer surface winding single channel or multichannel conductive filament of testing container；Each of which road conductive filament winds one
Circle；
2】For the first time to conductive filament load pulses electric current, the both end voltage background on now conductive filament is measured and records
Waveform；
3】While the deformation driving source of testing container starts, again to conductive filament load pulses electric current, measurement is simultaneously
Both end voltage measured waveform in record deformation process on conductive filament；
4】Background waveform is deducted by actual measurement voltage waveform, B alloy wire both end voltage variable quantity in tested container deformation process is obtained
Waveform；
5】By variable quantity waveform correspondence divided by background waveform, B alloy wire elongation change curve is obtained；
6】Using gained B alloy wire percentage elongation formula corresponding with resistance change rate under the conditions of static stretch, tested container ring is obtained
To strain curve.
Above-mentioned outer surface winding single channel or multichannel conductive filament in testing container specifically adopts bifilar parallel winding
Method.
Above-mentioned first time is using manual triggering mode to conductive filament load pulses electric current；It is described again to conductive filament
Load pulses electric current is to adopt and deformation driving source linkage triggering mode.
A kind of ring dynamic strain gauge means greatly, which is characterized in that：
Including exciting unit, measuring unit and recording unit；
The exciting unit includes pulsed constant current supply；
The measuring unit includes B alloy wire, ground floor dielectric film and installed part；
The recording unit includes build-out resistor and grapher；
The outfan of the pulsed constant current supply, one of outfan of B alloy wire, one end electrical connection of build-out resistor；
The other end of the build-out resistor is electrically connected with oscillograph input by coaxial cable；
The earth terminal of the pulsed constant current supply, another outfan of B alloy wire, the screen layer of coaxial cable, grapher
Earth terminal is grounded；
The triggering port of the pulsed constant current supply, grapher triggering port are electrically connected with the deformation driving source of testing container
Connect；
After the B alloy wire doubling, its doubling end is fixed by socket on mountings, itself and around two outfans be wrapped in
Tested container surface one after enclosing it is fixed on mountings, the ground floor dielectric film be arranged on B alloy wire and tested container surface it
Between.
Above-mentioned installed part includes pedestal, and the straight trough that upper surface is divided into two pieces of left and right is provided with the middle part of the pedestal, described
Be provided with insertion skewed slot on two pieces of pedestal upper surface or so, the doubling end of the B alloy wire be socketed in one of skewed slot with it is straight
On the projection that groove is surrounded.
Above-mentioned measuring unit also includes being arranged on B alloy wire and the outermost second layer dielectric film of installed part.
Above-mentioned B alloy wire is enamel-cover constantan wire or enamel-cover manganese-copper filament of the diameter between 0.4 to 0.5mm；The dielectric film is
0.05mm thick polyethylene film, polyester resin film, polyamide-imide resin film or polyimide resin film.
Above-mentioned pulsed constant current supply is to export the pulsed constant current supply that peak value reaches 1ms up to 9A, persistent period；The grapher is adopted
1MS, vertical resolution are reached up to 500MHz, sampling rate 100MS/s, record length with DPO4034 type digital oscilloscopes, or bandwidth
Up to the digital oscilloscope of 8Bits.
It is an advantage of the invention that：
1st, measured object deformation is converted to resistance variations using B alloy wire by the present invention, is finally changed under pulse current loading
For voltage signal, so as to provide a kind of feasible solution for a measurement difficult problem for the big strain of ring dynamic, and realize
The time of liter is more than 120 μ s, and peak value strains peak error and is less than 5% up to the 20% big strain measurement of ring dynamic.
2nd, the big strain gauge means of ring provided by the present invention dynamic, using pulse current load mode by resistance signal
Voltage signal, rather than conventional Huygens's electric bridge mode are converted to, so as to avoid under electric bridge mode because of sensitive resistance resistance
The less problem that can cause larger error.
3rd, the big strain gauge means of ring provided by the present invention dynamic, the B alloy wire of its Sensor section using it is bifilar simultaneously
Row mounting means, can be very good the interference for preventing external electromagnetic field to measuring.
Description of the drawings
Fig. 1 and Fig. 2 represent the Sensor section structural representation of the big strain gauge means of ring dynamic in the embodiment of the present invention
Figure.
Fig. 3 represents the electrical block diagram of the big strain gauge means of ring dynamic in the embodiment of the present invention.
Fig. 4 represents the front discharge voltage background waveform of actual measurement in the embodiment of the present invention.
Fig. 5 surveys voltage waveform in representing the embodiment of the present invention.
Fig. 6 represents voltage variety waveform after background is removed in the embodiment of the present invention.
Fig. 7 represents final gained strain variation course curve in the embodiment of the present invention.
Reference is as follows：1- testing containers or post shell, 2a- ground floor dielectric films, 2b- second layer dielectric films, 3- are installed
Part, 31- skewed slots, 32- straight troughs, 4- B alloy wires, 5- pulsed constant current supplies, 6- B alloy wire resistance, 7- build-out resistors, 8-SYV507 are coaxial
Cable, 9- oscillographs.
Specific embodiment
Ring dynamic strain gauge means greatly of the present invention include exciting unit, measuring unit and recording unit；Exciting unit
Including pulsed constant current supply；Measuring unit（That is strain transducer）Including B alloy wire, dielectric film and installed part；Recording unit includes
With resistance and oscillograph；The outfan of pulsed constant current supply, one of outfan of B alloy wire, one end of build-out resistor are electrically connected
Connect；The other end of build-out resistor is electrically connected with oscillograph input by coaxial cable；State earth terminal, the alloy of pulsed constant current supply
Another outfan of silk, the screen layer of coaxial cable, oscillograph earth terminal ground connection；The triggering port of pulsed constant current supply, oscillography
Device triggering port is electrically connected with the deformation driving source of testing container；After B alloy wire doubling, its doubling end is fixed by socket is installing
On part, itself and around two outfans be wrapped in after tested container surface one is enclosed it is fixed on mountings, dielectric film is arranged on conjunction
Between spun gold and tested container surface.
B alloy wire is enamel-cover constantan wire of the diameter between 0.4 to 0.5mm, in relatively small strain measurement, enamel-cover manganese
Copper wire can also be used for the design of the measurement apparatus.
Ground floor dielectric film and the polyethylene film that second layer dielectric film is 0.05mm thickness, or polyester resin film, polyamide acyl
One kind in imide resin film and polyimide resin film.
Installed part is the middle part 15mm × 6.5mm with double skewed slots × 2mm nylon material mounting blocks, itself and dielectric film, alloy
302 type Modified acrylate adhesive bondings are adopted between silk and determinand.
Pulsed constant current supply, exportable peak value reach the pulse constant current of 1ms up to 9A, persistent period.
Grapher adopts DPO4034 type digital oscilloscopes, or other bandwidth up to 500MHz, sampling rate 100MS/s, note
Record length reaches the digital oscilloscope of 8Bits up to 1MS, vertical resolution.
The voltage signal by measured by grapher, through appropriate data processing, and with reference to the B alloy wire for measuring in advance not
With the resistance characteristic under stretching condition, testee can be obtained by the strain history deforming to maximum.
Fig. 1 and Fig. 2 is that the strain transducer part-structure of the big strain gauge means of ring dynamic in the embodiment of the present invention shows
It is intended to.Installed part 3 and ground floor dielectric film 2a are circumferentially adhered to into 1 surface of testing container or post shell first, it is single to equivalent
Spun gold 4, its doubling end set is connected in the skewed slot of installed part 3, then by 4 bifilar wound testing container of B alloy wire or post shell 1 one weeks
It is embedded in the straight trough of installed part 3 afterwards, B alloy wire 4 is fixed using binding agent with installed part 3 and dielectric film 2a contact positions.Finally, will
Second layer dielectric film 2b is adhered to outermost layer, to play a part of to constrain B alloy wire and reinforce.Bonding agent is modified using 302 types
Acrylate adhesive.
Fig. 3 is the electrical block diagram of the big strain gauge means of ring dynamic in the embodiment of the present invention.Pulsed constant current supply 5
It is in parallel with B alloy wire 6, then Jing impedance matching resistors 7 and SYV507 coaxial cables 8 it is in parallel with grapher-oscillograph 9.Meanwhile,
Pulsed constant current supply triggering port, oscillograph triggering port are connected with the deformation driving source of testing container.
Measuring method of the present invention：
Measurement process：
When the big strain gauge means of ring dynamic work, trigger pulse constant-current source manual first, by under oscillograph recording
Discharge voltage background waveform produced by B alloy wire two ends, as shown in Figure 4.Now, testing container is not deformed upon, B alloy wire
Resistance does not change, and gained discharge voltage background waveform is only produced by pulse constant current loading.Due to pulsed constant current supply internal resistance
Effect, discharge voltage background waveform is not preferable horizontal linear, but has been inclined, but has no effect on measurement.During actual measurement,
The deformation driving source of testing container is started working, and preposition instrument and grapher are first triggered before testing container deforms, front
It is B alloy wire load pulses constant current to put instrument pulsed constant current supply, and strain transducer is to grapher voltage pulse output, appearance to be measured
Device starts to deform upon so that B alloy wire is deformed upon, and B alloy wire two ends resistance changes, and output voltage occurs to become simultaneously
Change, so as to by voltage waveform is surveyed under oscillograph recording, as shown in Figure 5.
Data handling procedure：
The waveform of discharge voltage background shown in Fig. 4 is deducted by Fig. 5 actual measurement voltage waveforms, you can obtain in tested container deformation process
B alloy wire both end voltage variable quantity waveform, as shown in Figure 6.Again by Fig. 6 voltage varieties waveform and Fig. 3 discharge voltage background waveforms
Correspondence is divided by, and can obtain B alloy wire elongation change curve.Recycle gained B alloy wire percentage elongation and resistance under the conditions of static stretch
Rate of change correspondence formula, can get Ge Lu hoop strain curve, as shown in Figure 7.It is arranged in the three road alloys on testing container surface
The largest deformation amount that silk ch1, ch2, ch3 are measured respectively is 20.6%, 21.1%, 18.1%, and quick-fried rear actual measurement barrel deformation is respectively
21.4%th, 21.5%, 20.3%, the two is sufficiently close to.
Big the adopted B alloy wire of strain gauge means of this ring dynamic and targeted measurand be not unique, used as enforcement
Example, B alloy wire have chosen the enamel-cover constantan wire of diameter 0.4mm, and measurand is overall diameter 112mm, interior diameter 100mm, length
The steel cylinder of 600mm, deformation driving source are 120gTNT explosive balls.
The big strain gauge means of this ring dynamic have been applied to the work of the dynamic strain measurement in explosion mechanics.
Claims (8)
1. the big strain measurement method of a kind of ring dynamic, it is characterised in that：Comprise the following steps：
1】In the outer surface winding single channel or multichannel B alloy wire of testing container；Each of which road B alloy wire winds one and encloses；
2】For the first time to B alloy wire load pulses electric current, the both end voltage background waveform on now B alloy wire is measured and records；
3】While the deformation driving source of testing container starts, again to B alloy wire load pulses electric current, measure and record shape
Both end voltage measured waveform during change on B alloy wire；
4】Background waveform is deducted by actual measurement voltage waveform, B alloy wire both end voltage variable quantity ripple in tested container deformation process is obtained
Shape；
5】By variable quantity waveform correspondence divided by background waveform, B alloy wire elongation change curve is obtained；
6】Using gained B alloy wire percentage elongation formula corresponding with resistance change rate under the conditions of static stretch, obtaining tested container ring should
Varied curve.
2. the big strain measurement method of ring dynamic according to claim 1, it is characterised in that：
The outer surface winding single channel or multichannel B alloy wire in testing container specifically adopts bifilar parallel winding method.
3. the big strain measurement method of ring according to claim 1 or claim 2 dynamic, it is characterised in that：
The first time is using manual triggering mode to B alloy wire load pulses electric current；It is described again to B alloy wire load pulses
Electric current is to adopt and deformation driving source linkage triggering mode.
4. big strain gauge means of a kind of ring dynamic, including exciting unit, measuring unit and recording unit；The exciting unit
Including pulsed constant current supply；The recording unit includes build-out resistor and grapher；
It is characterized in that：
The measuring unit includes B alloy wire, ground floor dielectric film and installed part；
The outfan of the pulsed constant current supply, one of outfan of B alloy wire, one end electrical connection of build-out resistor；
The other end of the build-out resistor is electrically connected with oscillograph input by coaxial cable；
The earth terminal of the pulsed constant current supply, another outfan of B alloy wire, the screen layer of coaxial cable, grapher ground connection
End ground connection；
The triggering port of the pulsed constant current supply, grapher triggering port are electrically connected with the deformation driving source of testing container；
After the B alloy wire doubling, its doubling end is fixed by socket on mountings, itself and around two outfans be wrapped in it is tested
Vessel surface one is fixed on mountings after enclosing, and the ground floor dielectric film is arranged between B alloy wire and tested container surface.
5. big strain gauge means of ring according to claim 4 dynamic, it is characterised in that：The installed part includes base
Seat, is provided with the middle part of the pedestal on two pieces of the straight trough that upper surface is divided into two pieces of left and right, described pedestal upper surface or so and is all provided with
Insertion skewed slot is equipped with, the doubling end of the B alloy wire is socketed on the projection that one of skewed slot is surrounded with straight trough.
6. the dynamic big strain gauge means of ring according to claim 4 or 5, it is characterised in that：
The measuring unit also includes being arranged on B alloy wire and the outermost second layer dielectric film of installed part.
7. big strain gauge means of ring according to claim 6 dynamic, it is characterised in that：
The B alloy wire is enamel-cover constantan wire or enamel-cover manganese-copper filament of the diameter between 0.4 to 0.5mm；Ground floor dielectric film and second
Layer dielectric film is the thick polyethylene films of 0.05mm, polyester resin film, polyamide-imide resin film or polyimide resin film.
8. big strain gauge means of ring according to claim 7 dynamic, it is characterised in that：The pulsed constant current supply is defeated
Go out the pulsed constant current supply that peak value reaches 1ms up to 9A, persistent period；The grapher adopts DPO4034 type digital oscilloscopes, or band
The wide digital oscilloscope for reaching 8Bits up to 500MHz, sampling rate 100MS/s, record length up to 1MS, vertical resolution.
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| CN104406514B (en) * | 2014-11-28 | 2017-06-20 | 广东欧珀移动通信有限公司 | A kind of device and method for measuring object Bending Deformation degree |
| CN105423994B (en) * | 2015-12-18 | 2017-12-01 | 中国科学院武汉岩土力学研究所 | Hoop strain measurement apparatus |
| CN106839958A (en) * | 2017-01-24 | 2017-06-13 | 东南大学 | A kind of simple distress in concrete monitoring and measuring equipment and method |
| CN109974572B (en) * | 2019-03-25 | 2020-11-06 | 绍兴文理学院 | Graphene rubber strain testing device and rock strain measuring method |
| CN112985981B (en) * | 2021-02-09 | 2023-01-31 | 北京工业大学 | Radial dynamic strain detection device |
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| CN1039113A (en) * | 1988-06-30 | 1990-01-24 | 北京理工大学 | The lagrangian measurement of two-dimentional axial symmetry flow field |
| US5214962A (en) * | 1991-09-05 | 1993-06-01 | Sverdrup Technology, Inc. | Constant-resistance signal conditioner for dynamic strain measurement |
| JPH11248408A (en) * | 1998-02-27 | 1999-09-17 | Saginomiya Seisakusho Inc | Dynamic strain measuring instrument |
| CN101887080A (en) * | 2010-06-24 | 2010-11-17 | 电子科技大学 | Method for testing ytterbium meter dynamic piezo-resistance |
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2013
- 2013-12-24 CN CN201310737647.8A patent/CN103743335B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039113A (en) * | 1988-06-30 | 1990-01-24 | 北京理工大学 | The lagrangian measurement of two-dimentional axial symmetry flow field |
| US5214962A (en) * | 1991-09-05 | 1993-06-01 | Sverdrup Technology, Inc. | Constant-resistance signal conditioner for dynamic strain measurement |
| JPH11248408A (en) * | 1998-02-27 | 1999-09-17 | Saginomiya Seisakusho Inc | Dynamic strain measuring instrument |
| CN101887080A (en) * | 2010-06-24 | 2010-11-17 | 电子科技大学 | Method for testing ytterbium meter dynamic piezo-resistance |
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