CN1766644A - Experimental measurement method for dynamic tension coefficient of metal foil - Google Patents
Experimental measurement method for dynamic tension coefficient of metal foil Download PDFInfo
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- CN1766644A CN1766644A CN 200510101082 CN200510101082A CN1766644A CN 1766644 A CN1766644 A CN 1766644A CN 200510101082 CN200510101082 CN 200510101082 CN 200510101082 A CN200510101082 A CN 200510101082A CN 1766644 A CN1766644 A CN 1766644A
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- primacord fuse
- shell
- luminescent grain
- high speed
- speed camera
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Abstract
The invention discloses a mental foil dynamic dragging factor experiment measuring method which is characterized in that: it stickup the tested mental foil on the pipe case with a sealed ring which is formed by butting the two ends of the mental foil; the interface of the two ends of the mental foil uses insulating material; there are two pairs of wire from the two ends, wherein one pair as power end, the other pair as signal end; the two ends of the pipe case has detonating fuse which has blasting agent, wherein the detonating fuse is connected with the detonating fuse of the lighting medical column; the slit of the high speed camera aims to the tested mental foil and the middle line of the lighting medical column; it detonates the lighting medical column and the pipe case at the same time, the photographic plate of the high speed camera records the changing course of the mental foil dilemma and the electric measuring system records the changing course of the mental foil resistance.
Description
Technical field
The present invention relates to a kind of metal forming drawing coefficient experimental measurement method, particularly relate to a kind of experimental measurement method for dynamic tension coefficient of metal foil.
Background technology
In metal forming, particularly copper-manganese paper tinsel and the sensor of constantan paper tinsel through being usually used in physical quantitys such as various gaging pressures, displacement, speed, strain and rate of strain.When metal stretching, its resistance value changes, and the corresponding relation between them is:
ΔR/R
0＝K·ΔL/L
0＝K·Δd/d
0..................................(1)
R wherein
0And L
0Be respectively the initial resistance and the initial length of metal forming, when being circular as if metal forming, Δ L/L
0=Δ d/d
0, d wherein
0Initial diameter for circle.Δ R, Δ L and Δ d are respectively their changing value, and K is a drawing coefficient:
K＝(1+2μ)+1/ε·dρ/ρ.......................................(2)
Wherein μ is the Poisson ratio of metal forming, and ρ is a resistivity, and ε is the length strain.
For copper-manganese paper tinsel and constantan paper tinsel, under static state, do not consider variation of temperature, can get d ρ=0, μ ≈ 0.5 (experiment value) is so K ≈ 2.0.Yet in dynamic environment, rate of strain can reach 10
4～10
6/ second, this moment, d ρ was not 0, and the μ value also will change.Owing to there is not the experimental calibration method of dynamic tension coefficient of metal foil, therefore, when dynamic environment is measured, these metal forming sensors are still used its static drawing coefficient value, therefore brought bigger systematic error.
Summary of the invention
The object of the present invention is to provide a kind of experimental measurement method for dynamic tension coefficient of metal foil.
Purpose of the present invention is achieved by the following technical programs:
Experimental measurement method for dynamic tension coefficient of metal foil of the present invention is characterized in that: metal forming to be measured is sticked on the shell, and make the metal forming two ends to being connected into the annular of sealing; Metal forming two ends interface insulate with insulating material, and draw two pairs of lead-in wires respectively from these two ends, wherein a pair of as power end, another is to as signal end, constitute the four-terminal measurement circuit of a standard, wherein power end is connected with the power end of pulse constant current power supply, and signal end is connected with oscillographic signal input part; Explosive is housed in the shell, and the shell two ends respectively are inserted with a primacord fuse; Primacord fuse on the shell is connected with the primacord fuse of luminescent grain; The primacord fuse of luminescent grain is connected with the enabling signal end of high speed camera; The slit of high speed camera is aimed at circular ring metal paper tinsel to be measured, aims at the center line of the luminescent grain of light source as a setting simultaneously; The shell that posts metal forming to be measured places between the slit of luminescent grain and high speed camera, and the axis of its axis and luminescent grain is perpendicular; Start high speed camera, ignite luminescent grain and shell simultaneously; Note the vary in diameter process Δ d/d of metal forming to be measured on the film of high speed camera
0The changes in resistance process Δ R/R of metal forming to be measured under the oscillograph recording
0Can calculate the dynamic tension coefficient K value of metal forming to be measured by formula (1).
For realizing accurate simultaneous initiation, can between the primacord fuse of primacord fuse on the shell and luminescent grain, establish two high-precise synchronization detonators that link together, each is connected the primacord fuse on the shell and the primacord fuse of luminescent grain with one of them high-precise synchronization detonator; The primacord fuse of above-mentioned high-precise synchronization detonator is connected with the enabling signal end of high speed camera.
Realize that precise synchronization is detonated and to take following scheme: between described luminescent grain and high speed camera, also be connected high pressure thunder and primary explosive column, the primacord fuse of high-voltage detonator is connected with the initiating signal end of high speed camera, one end of primary explosive column is connected with an end of high-voltage detonator, and the other end is connected with the primacord fuse of luminescent grain and the primacord fuse of shell.
For metal forming to be measured position, the equal in length that inserts in the primacord fuse in the shell on its both sides.
Primacord fuse on the described luminescent grain is than the short 5～25mm of the primacord fuse on the shell.
Be symmetry, synchronism and the reduction experimental cost that further guarantees experiment, the simultaneous initiation device has also been adopted in this experiment, described simultaneous initiation device is a column type tubular construction, have three horizontal pilot tunnels evenly distributedly on its same plane radially, horizontal pilot tunnel communicates with the pipeline at simultaneous initiation device center, wherein two horizontal pilot tunnels are used to insert the primacord fuse from the shell two ends, and for metal forming to be measured position, the length of the primacord fuse on its both sides equates; Another pilot tunnel inserts the primacord fuse from luminescent grain, and this section primacord fuse is than the short 5～25mm of the primacord fuse that inserts the shell two ends, to guarantee that luminescent grain detonates early than shell; High-voltage detonator is placed on the top of the column type pipe of described simultaneous initiation device, places primary explosive column in the middle of the bottom.
The primacord fuse of described luminescent grain is enclosed within the organic glass cover, and is fixed on the luminescent grain by this organic glass cover.
In order to determine the relative position of flash ranging signal and electromotive signal, on luminescent grain, leave air-gap, and in air-gap, insert electric probe, electric probe and measurement metal forming resistance variations process Δ R/R
0Oscillographic signal input part connect; Start high speed camera, when detonation wave process air-gap, air-gap writes down a luminous point on the film of high speed camera, the electric probe that inserts in the air-gap writes down a pulse signal on oscillograph, common start time when luminous point and pulse signal can be used as two kinds of Data Processing in Experiment utilizes formula (1) can get the dynamic tension coefficient K value of metal forming to be measured then.
The present invention passes through simply and cleverly experimental technique, solve metal forming and in dynamic environment, carried out the difficult problem that drawing coefficient is measured, and utilize high-precise synchronization detonator, simultaneous initiation device, on luminescent grain, leave air-gap, and in air-gap, insert method such as electric probe, make simultaneous initiation more accurate, dropped to the error of testing minimum as much as possible.In practice, owing to had the accurate mensuration of dynamic tension coefficient of metal foil, can greatly reduce the systematic error of metal forming class sensor.
Description of drawings
Fig. 1 is the experimental system synoptic diagram of embodiment one;
Fig. 2 is the experimental system synoptic diagram of embodiment two;
Fig. 3 is the experimental system synoptic diagram of embodiment three;
Fig. 4 is the experimental system synoptic diagram of embodiment three;
Fig. 5 is that the A-A of the luminescent grain among Fig. 4 is to view;
Fig. 6 is a simultaneous initiation device structural representation;
Fig. 7 is that the A-A of Fig. 6 is to view;
Fig. 8 is the experiment flash ranging record diagram of embodiment three;
Fig. 9 is the experiment electric log figure of embodiment three.
Embodiment
Embodiment one
As shown in Figure 1, experimental measurement method for dynamic tension coefficient of metal foil of the present invention: metal forming 1 to be measured is sticked on the shell 2, and make metal forming 1 two ends to being connected into the annular of sealing; Metal forming 1 two ends interface insulate with insulating material, and draw two pairs of lead-in wires 3,4 respectively from these two ends, wherein pair of lead wires 3 is as power end, another is to going between 4 as signal end, constitute the four-terminal measurement circuit of a standard, wherein power end is connected with the power end of pulse constant current power supply 5, and signal end is connected with the signal input part of oscillograph 6; In the shell 2 explosive is housed, shell 1 two ends respectively are inserted with a primacord fuse 7; Primacord fuse 7 on the shell 1 is connected with the primacord fuse 9 of luminescent grain 8; The primacord fuse 9 of luminescent grain 8 is connected with the enabling signal end of high speed camera 10; The slit of high speed camera 10 is aimed at circular ring metal paper tinsel 1 to be measured, aims at the center line of the luminescent grain 8 of light source as a setting simultaneously; The shell 2 that posts metal forming to be measured places between the slit of luminescent grain 8 and high speed camera 10, and the axis of its axis and luminescent grain 8 is perpendicular; Start high speed camera, ignite luminescent grain 8 and shell 2 simultaneously; Note the vary in diameter process Δ d/d of metal forming 1 to be measured on the film of high speed camera 10
0Oscillograph 6 is noted the changes in resistance process Δ R/R of metal forming 1 to be measured
0Can calculate the dynamic tension coefficient K value of metal forming 1 to be measured by formula (1).
Embodiment two
Be embodiments of the invention two as shown in Figure 2, different with the foregoing description is: also be connected with high-voltage detonator 11 and primary explosive column 12 between described luminescent grain 8 and the high speed camera 10, the primacord fuse of high-voltage detonator 11 is connected with the initiating signal end of high speed camera 10, one end of primary explosive column 12 is connected with an end of high-voltage detonator 11, and the other end is connected with the primacord fuse 9 of luminescent grain 8 and the primacord fuse 7 of shell 2; For metal forming to be measured 1 position, the equal in length that inserts in the primacord fuse 7 in the shell 2 on its both sides; Primacord fuse 9 on the described luminescent grain 8 is than the 7 short 5～25mm of the primacord fuse on the shell 2.
Embodiment three
Be embodiments of the invention three as shown in Figure 3, different with embodiment one is: establish two high-precise synchronization detonators 13 that link together between the primacord fuse 9 of primacord fuse on the shell 27 and luminescent grain 8, each is connected the primacord fuse 7 on the shell 2 and the primacord fuse of luminescent grain 89 with one of them high-precise synchronization detonator 13; The primacord fuse 14 of above-mentioned high-precise synchronization detonator 13 is connected with the enabling signal end of high speed camera 10, to realize more accurate simultaneous initiation.
Embodiment four
As Fig. 4～shown in Figure 9, different with the foregoing description is that present embodiment has also adopted simultaneous initiation device 15.Described simultaneous initiation device 15 is a column type tubular construction, have three horizontal pilot tunnels 16,17,18 on its same plane radially evenly distributedly, horizontal pilot tunnel 16,17,18 communicates with the pipeline at simultaneous initiation device 15 centers, wherein two horizontal pilot tunnels 16,17 are used to insert the primacord fuse 7 from shell 2 two ends, for metal forming to be measured 1 position, the length of the primacord fuse 7 on its both sides equates; The primacord fuse 9 that another pilot tunnel 18 inserts from luminescent grain 8, this section primacord fuse 9 is than the primacord fuse 7 short 10～20mm that insert shell 2 two ends, the primacord fuse 9 of described luminescent grain 8 is enclosed within the organic glass cover 19, and is fixed on the luminescent grain 8 by this organic glass cover 19; High-voltage detonator 11 is placed on the top of the column type pipe of described simultaneous initiation device 15, places primary explosive column 12 in the middle of the bottom; In order to determine the relative position of flash ranging signal and electromotive signal, on luminescent grain 8, leave air-gap 20, and in air-gap 20, insert electric probe 21, electric probe 21 and measurement metal forming 1 resistance variations process Δ R/R
0The signal input part of oscillograph 6 connect; Start high speed camera 10, when detonation wave process air-gap 20, air-gap 20 writes down a luminous point 22 on the film of high speed camera 10, the electric probe 21 that inserts in the air-gap 20 writes down a pulse signal 23 on oscillograph 5, common start time when luminous point 22 can be used as two kinds of Data Processing in Experiment with pulse signal 23 utilizes formula (1) can get the dynamic tension coefficient K value of metal forming 1 to be measured then.
The present invention is not limited to the foregoing description, so long as this instructions summary of the invention and claims, the scheme that part is mentioned all can be implemented.
Claims (10)
1. experimental measurement method for dynamic tension coefficient of metal foil is characterized in that: metal forming to be measured is sticked on the shell, and make the metal forming two ends to being connected into the annular of sealing; Metal forming two ends interface insulate with insulating material, and draw two pairs of lead-in wires respectively from these two ends, wherein a pair of as power end, another is to as signal end, constitute the four-terminal measurement circuit of a standard, wherein power end is connected with the power end of pulse constant current power supply, and signal end is connected with oscillographic signal input part; Explosive is housed in the shell, and the shell two ends respectively are inserted with a primacord fuse; Primacord fuse on the shell is connected with the primacord fuse of luminescent grain; The primacord fuse of luminescent grain is connected with the enabling signal end of high speed camera; The slit of high speed camera is aimed at circular ring metal paper tinsel to be measured, aims at the center line of the luminescent grain of light source as a setting simultaneously; The shell that posts metal forming to be measured places between the slit of luminescent grain and high speed camera, and the axis of its axis and luminescent grain is perpendicular; Start high speed camera, ignite luminescent grain and shell simultaneously; Note the vary in diameter process Δ d/d of metal forming to be measured on the film of high speed camera
0The changes in resistance process Δ R/R of metal forming to be measured under the oscillograph recording
0Calculate the dynamic tension coefficient K value of metal forming to be measured.
2. experimental measurement method for dynamic tension coefficient of metal foil according to claim 1, it is characterized in that: be provided with two high-precise synchronization detonators that link together between the primacord fuse on the shell and the primacord fuse of luminescent grain, each is connected the primacord fuse on the shell and the primacord fuse of luminescent grain with one of them high-precise synchronization detonator; The primacord fuse of above-mentioned high-precise synchronization detonator is connected with the enabling signal end of high speed camera.
3. experimental measurement method for dynamic tension coefficient of metal foil according to claim 1, it is characterized in that: also be connected with high pressure thunder and primary explosive column between described luminescent grain and the high speed camera, the primacord fuse of high-voltage detonator is connected with the initiating signal end of high speed camera, one end of primary explosive column is connected with an end of high-voltage detonator, and the other end is connected with the primacord fuse of luminescent grain and the primacord fuse of shell.
4. according to claim 1 or 2 or 3 described experimental measurement method for dynamic tension coefficient of metal foil, it is characterized in that: described for the metal forming position, the equal in length of the primacord fuse on its both sides.
5. experimental measurement method for dynamic tension coefficient of metal foil according to claim 4 is characterized in that: the primacord fuse on the described luminescent grain is than the short 5～25mm of the primacord fuse on the shell.
6. experimental measurement method for dynamic tension coefficient of metal foil according to claim 3, it is characterized in that: the simultaneous initiation device has been adopted in this experiment, described simultaneous initiation device is a column type tubular construction, have three horizontal pilot tunnels evenly distributedly on its same plane radially, horizontal pilot tunnel communicates with the pipeline at simultaneous initiation device center.
7. experimental measurement method for dynamic tension coefficient of metal foil according to claim 6, it is characterized in that: two horizontal pilot tunnels in the described simultaneous initiation device are used to insert the primacord fuse from the shell two ends, for metal forming to be measured position, the length of the primacord fuse on its both sides equates; Another pilot tunnel inserts the primacord fuse from luminescent grain, and this section primacord fuse is than the short 5～25mm of the primacord fuse that inserts the shell two ends; High-voltage detonator is placed on the top of the column type pipe of described simultaneous initiation device, places primary explosive column in the middle of the bottom.
8. according to claim 1 or 2 or 3 or 7 described experimental measurement method for dynamic tension coefficient of metal foil, it is characterized in that: the primacord fuse of described luminescent grain is enclosed within the organic glass cover, and is fixed on the luminescent grain by this organic glass cover.
9. according to claim 1 or 2 or 3 or 7 described experimental measurement method for dynamic tension coefficient of metal foil, it is characterized in that: on luminescent grain, leave air-gap, and in air-gap, insert electric probe, electric probe and measurement metal forming resistance variations process Δ R/R
0Oscillographic signal input part connect; Start high speed camera, air-gap writes down a luminous point on the film of high speed camera, and the electric probe that inserts in the air-gap writes down a pulse signal on oscillograph, luminous point and pulse signal common start time during as two kinds of Data Processing in Experiment.
10. experimental measurement method for dynamic tension coefficient of metal foil according to claim 8 is characterized in that: leave air-gap on luminescent grain, and insert electric probe in air-gap, electric probe and measurement metal forming resistance variations process Δ R/R
0Oscillographic signal input part connect; Start high speed camera, air-gap writes down a luminous point on the film of high speed camera, and the electric probe that inserts in the air-gap writes down a pulse signal on oscillograph, luminous point and pulse signal common start time during as two kinds of Data Processing in Experiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510101082 CN1766644B (en) | 2005-11-08 | 2005-11-08 | Experimental measurement method for dynamic tension coefficient of metal foil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510101082 CN1766644B (en) | 2005-11-08 | 2005-11-08 | Experimental measurement method for dynamic tension coefficient of metal foil |
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| Publication Number | Publication Date |
|---|---|
| CN1766644A true CN1766644A (en) | 2006-05-03 |
| CN1766644B CN1766644B (en) | 2010-10-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710049B (en) * | 2009-11-09 | 2011-10-26 | 北京航空航天大学 | Method for testing tensile mechanical performance of TiAl-base alloy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1013998B (en) * | 1988-06-30 | 1991-09-18 | 北京理工大学 | Laplace measurement of two-dimensional axial-symmetry flow field |
| CN1088517C (en) * | 1999-01-27 | 2002-07-31 | 北京理工大学 | Fixture for dynamic stretching test of fibre reinforced compound material |
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2005
- 2005-11-08 CN CN 200510101082 patent/CN1766644B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101710049B (en) * | 2009-11-09 | 2011-10-26 | 北京航空航天大学 | Method for testing tensile mechanical performance of TiAl-base alloy |
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Granted publication date: 20101013 Termination date: 20131108 |