CN103353426B - A kind of measurement mechanism of Cylindrical Explosion Vessel axial load and measuring method - Google Patents
A kind of measurement mechanism of Cylindrical Explosion Vessel axial load and measuring method Download PDFInfo
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- CN103353426B CN103353426B CN201310264364.6A CN201310264364A CN103353426B CN 103353426 B CN103353426 B CN 103353426B CN 201310264364 A CN201310264364 A CN 201310264364A CN 103353426 B CN103353426 B CN 103353426B
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Abstract
The measurement mechanism of a kind of Cylindrical Explosion Vessel axial load of the present invention, comprise post shell, be arranged on post shell two ends and with annular groove two flat-plate closures, be placed on Zhu Ke center explosive, be pasted onto explosive surface electric probe, for being fixedly connected with the screw rod of two flat-plate closures and post shell and nut, the foil gauge be pasted onto on screw rod, detonator for fired charge; Described electric probe is connected with oscillograph by detonation velocity meter, and described foil gauge is connected with oscillograph by strainmeter.The present invention passes through measurement mechanism and the measuring method of Cylindrical Explosion Vessel axial load, utilizes similitude law of blast can carry out scale model examination to large-sized Cylindrical Explosion Vessel, and optimize the Intensity Design of end socket and screw rod, experimental expenses is low, practical.The present invention has great importance for the xial feed of cylindrical container under the effect of understanding internal explosion, and experimental principle is simple, easily operates.
Description
Technical field
The invention belongs to explosion mechanics technical field, relate to measurement mechanism and the measuring method of Cylindrical Explosion Vessel xial feed under internal explosion effect, the apparatus and method of this invention are applied to the measurement of Cylindrical Explosion Vessel axial load.
Background technology
Explosive container is widely used in scientific research because it effectively can close explosion wave and explosion product, commercial production, dangerous material store and the aspect such as transport and anti-terrorism.Because cylindrical container can be easier to realize larger inner space, easy to process, cost relative moderate, obtains a wide range of applications.
Typical case's Cylindrical Explosion Vessel is made up of the syndeton of column main cylinder, end cap and end socket and main cylinder, and the complex reflex of explosion wave at end cap place can apply very strong Axial pulsating load to container.Axial load is the basis of end socket and end socket and main cylinder syndeton Intensity Design; Axial load and radial load in succession superposition, on main cylinder, also can affect the structural response of main cylinder.As can be seen here, the research of Cylindrical Explosion Vessel axial load is of great significance for Vessel Design tool.About the structural response etc. under Cylindrical Explosion Vessel radial load and distribution vertically thereof, Radial Loads has carried out large quantifier elimination, have no the report of axial load research.
Summary of the invention
The object of this invention is to provide a kind of measurement mechanism and measuring method of Cylindrical Explosion Vessel axial load, it can carry out the measurement of Cylindrical Explosion Vessel axial load.
Technical solution of the present invention is:
A measurement mechanism for Cylindrical Explosion Vessel xial feed under internal explosion effect, its special character is: comprise post shell 1, be arranged on post shell 1 two ends and with annular groove two flat-plate closures 4, be placed on post shell 1 center explosive 6, be pasted onto explosive 6 surface electric probe 7, for being fixedly connected with the screw rod 2 of two flat-plate closures 4 and post shell 1 and nut 3, the foil gauge 9 be pasted onto on screw rod 2, detonator 5 for fired charge 6; Described electric probe 7 is connected with oscillograph 12 by detonation velocity meter 8, and described foil gauge 9 is connected with oscillograph 12 by strainmeter.
A measuring method for Cylindrical Explosion Vessel xial feed under internal explosion effect, its special character is: comprise the following steps:
1] with screw rod 2 and nut 3, flat-plate closure 4 is fixed on the two ends of post shell 1;
2] explosive in post shell 1 is ignited;
3] electric probe 7 on explosive 6 surface obtains by detonation velocity meter 8 the exact time pulse waveform that explosive 6 detonates on oscillograph 12, thus obtains the correct time sequence that blast load acts in post shell 1; Meanwhile, the foil gauge 9 on screw rod 2 obtains the stress on screw rod 2 on oscillograph 12 by strainmeter 11, thus obtains the power acting on screw rod 2, then obtains axial load mean value on flat-plate closure 4:
P
aver＝nEεS
1/S
2
In formula:
N is screw rod quantity;
E is screw rod 2 elasticity modulus of materials;
ε is strain value on single screw rod 2; ,
S
1for screw rod 2 sectional area;
S
2for end socket 4 projected area.
A measuring method for Cylindrical Explosion Vessel xial feed under internal explosion effect, its special character is: comprise the following steps:
1] according to similitude law of blast, determine the size of scale model, select the material consistent with prototype to make scale model; Described scale model comprises post shell 1, screw rod 2, nut 3, flat-plate closure 4;
2] with screw rod 2 and nut 3, flat-plate closure 4 is fixed on the two ends of post shell 1;
3] explosive in post shell 1 is ignited;
4] electric probe 7 on explosive 6 surface obtains by detonation velocity meter 8 the exact time pulse waveform that explosive 6 detonates on oscillograph 12, thus obtains the correct time sequence that blast load acts in post shell 1; Meanwhile, the foil gauge 9 on screw rod 2 obtains the stress on screw rod 2 on oscillograph 12 by strainmeter 11, thus obtains the power acting on screw rod 2, then obtains axial load mean value on flat-plate closure 4:
P
aver＝nEεS
1/S
2
In formula:
N is screw rod quantity;
E is screw rod 2 elasticity modulus of materials;
ε is strain value on single screw rod 2; ,
S
1for screw rod 2 sectional area;
S
2for end socket 4 projected area;
5] calculate the axial load mean value of prototype than proportionate relationship according to following contracting:
L∝1/η；t∝1/η；Q∝1/η
1/3；P∝1 (2)
In formula:
L represents physical dimension;
η is that ratio is compared in contracting;
T is time quantum;
Q is explosive yield P is pressure load.
Beneficial effect of the present invention:
1, the present invention studies measurement measurement mechanism and the measuring method of Cylindrical Explosion Vessel axial load, has great importance for the xial feed of cylindrical container under the effect of understanding internal explosion.
2, the present invention studies measurement mechanism and the measuring method of Cylindrical Explosion Vessel axial load, and experimental principle is simple, easily operates.
3, the present invention passes through measurement mechanism and the measuring method of Cylindrical Explosion Vessel axial load, and utilize similitude law of blast can carry out scale model examination to large-sized Cylindrical Explosion Vessel, optimize the Intensity Design of end socket and screw rod, experimental expenses is low, practical.
4, the present invention is measured inner detonation lower prop shell xial feed by the strain on screw rod, the strain signal consistance of many screw rod measurements is good, and the method that the mean strain waveform recorded by screw rod studies Cylindrical Explosion Vessel axial load is with a high credibility.
Accompanying drawing explanation
Fig. 1 is Cylindrical Explosion Vessel axial load measurement mechanism schematic diagram;
Fig. 2 is screw rod mean strain waveform schematic diagram;
Fig. 3 is end cap average load waveform schematic diagram;
Reference numeral: 1-post shell; 2-screw rod; 3-nut; 4-flat-plate closure; 5-detonator; 6-explosive; 7-electric probe; 8-detonation velocity meter; 9-foil gauge; 10-bridge box; 11-strainmeter; 12-oscillograph.
Embodiment
Under internal explosion effect, the measurement mechanism of Cylindrical Explosion Vessel xial feed is as follows:
At the post shell 1 center explosive 6 of wall thickness h, inside radius R, long L, at explosive 6 surface mount electric probe 7.Post shell 1 two ends are arranged in the flat-plate closure 4 with annular groove, and two flat-plate closures 4 are connected with nut 3 by uniform screw rod 2, utilize screw rod 2 and nut 3 flat-plate closure 4 and post shell 1 to be connected and fixed, screw rod 2 pastes foil gauge.By detonator 5 fired charge 6, the electric probe 7 on explosive 6 surface can obtain by detonation velocity meter 8 the exact time pulse waveform that explosive 6 detonates on oscillograph 12, thus can the correct time sequence that acts in post shell 1 of interpretation blast load.The signal that foil gauge 9 on screw rod 2 is measured is stored on oscillograph 12 through gap bridge box 10 and strainmeter 11, by the strain waveform on the screw rod 2 of measurement, the stress on screw rod 2 can be obtained, obtain by the stress on screw rod 2 power acting on screw rod 2, just can obtain axial load mean value on end socket 4.
P
aver＝nEεS
1/S
2(1)
In formula:
N is screw rod quantity;
E is screw rod 2 elasticity modulus of materials;
ε is strain value on single screw rod 2; ,
S
1for screw rod 2 sectional area;
S
2for end socket 4 projected area.
The container comparatively large for equivalent, physical dimension is larger, according to similitude law of blast, can determine axial load size by scale model in the design phase.When prototype is consistent with the material of model, basic contracting than proportionate relationship is:
L∝1/η；t∝1/η；Q∝1/η
1/3；P∝1 (2)
In formula:
L represents physical dimension;
η is that ratio is compared in contracting;
T is time quantum;
Q is explosive yield;
P is pressure load.
(2) 1/ η that formula represents the physical dimension of scale model, time quantum is prototype, explosive yield is 1/ η of prototype
1/3, the amount of pressure of prototype and scale model is equal.
Under internal explosion effect, the measuring method of Cylindrical Explosion Vessel xial feed is as follows:
1) design post columella to load device, Fig. 1 is Cylindrical Explosion Vessel axial load measurement mechanism schematic diagram.The material of steel cylinder (post shell) is 20 steel, and length is 600mm, and external diameter is 124mm, and wall thickness is 12mm.The explosive yield of experiment is 180gTNT equivalent.
2) lay the explosive of 180gTNT equivalent at steel cylinder center, electric probe pasted by explosive ball, electric probe is connected with detonation velocity meter 8 by concentric cable, and detonation velocity meter 8 is connected with oscillograph 12;
3) designing screw rod quantity is 6, and the diameter of section of screw rod is 20mm, guarantees that the pretightning force of every root screw rod is consistent during installation; In order to improve the quality of measurement data, every root screw rod all pastes foil gauge, and the strain measurement of single screw rod adopts symmetric double work tablet mode.Foil gauge 9 is connected with bridge box 10 by quad, and bridge box is connected with strainmeter 11, and strainmeter is connected with oscillograph 12 by concentric cable, and oscillograph sampling rate is set to 10MS/s, and record length is 1M;
4) post shell and flat-plate closure 4 are connected and fixed by screw rod, nut;
5) use blasting cap initiation explosive, electric probe signal can accurately determine the explosive charge moment, and then can obtain the correct time sequence of Explosion Loading.
6) strain waveform obtained on screw rod is measured by experiment, screw rod mean strain waveform is obtained, as shown in Figure 2, under the detonation of 180gTNT equivalent through process, the strain peak value that single screw rod is measured is 5100 μ ε, can obtain by elasticity Hooke's law the stress that screw rod is subject to; As shown in Figure 3, the maximum axial of end cap is 250MPa to the average load waveform of end cap, namely obtains the axial load of post shell internal explosion.
Claims (3)
1. the measurement mechanism of Cylindrical Explosion Vessel xial feed under an internal explosion effect, it is characterized in that: comprise post shell (1), be arranged on post shell (1) two ends and with two flat-plate closures (4) of annular groove, be placed on the explosive (6) at post shell (1) center, be pasted onto the electric probe (7) on explosive (6) surface, for being fixedly connected with screw rod (2) and the nut (3) of two flat-plate closures (4) and post shell (1), be pasted onto the foil gauge (9) on screw rod (2), for the detonator (5) of fired charge (6), described electric probe (7) is connected with oscillograph (12) by detonation velocity meter (8), and described foil gauge (9) is connected with oscillograph (12) by strainmeter.
2. the measuring method of Cylindrical Explosion Vessel xial feed under internal explosion effect, is characterized in that: comprise the following steps:
1] with screw rod (2) and nut (3), flat-plate closure (4) is fixed on the two ends of post shell (1);
2] explosive in post shell (1) is ignited;
3] electric probe (7) on explosive (6) surface obtains by detonation velocity meter (8) the exact time pulse waveform that explosive (6) detonates on oscillograph (12), thus obtains the correct time sequence that blast load acts in post shell (1); Simultaneously, foil gauge (9) on screw rod (2) obtains the stress on screw rod (2) on oscillograph (12) by strainmeter (11), thus obtain the power acting on screw rod (2), then obtain the upper axial load mean value of flat-plate closure (4):
P
aver＝nEεS
1/S
2
In formula:
N is screw rod quantity;
E is screw rod (2) elasticity modulus of materials;
ε is the upper strain value of single screw rod (2);
S
1for screw rod (2) sectional area;
S
2for end socket (4) projected area.
3. the measuring method of Cylindrical Explosion Vessel xial feed under internal explosion effect, is characterized in that: comprise the following steps:
1] according to similitude law of blast, determine the size of scale model, select the material consistent with prototype to make scale model; Described scale model comprises post shell (1), screw rod (2), nut (3), flat-plate closure (4);
2] with screw rod (2) and nut (3), flat-plate closure (4) is fixed on the two ends of post shell (1);
3] explosive in post shell (1) is ignited;
4] electric probe (7) on explosive (6) surface obtains by detonation velocity meter (8) the exact time pulse waveform that explosive (6) detonates on oscillograph (12), thus obtains the correct time sequence that blast load acts in post shell (1); Simultaneously, foil gauge (9) on screw rod (2) obtains the stress on screw rod (2) on oscillograph (12) by strainmeter (11), thus obtain the power acting on screw rod (2), then obtain the upper axial load mean value of flat-plate closure (4):
P
aver＝nEεS
1/S
2
In formula:
N is screw rod quantity;
E is screw rod (2) elasticity modulus of materials;
ε is the upper strain value of single screw rod (2);
S
1for screw rod (2) sectional area;
S
2for end socket (4) projected area;
5] calculate the axial load mean value of prototype than proportionate relationship according to following contracting:
L∝1/η；t∝1/η；Q∝1/η
1/3；P∝1 (2)
In formula:
L represents physical dimension;
η is that ratio is compared in contracting;
T is time quantum;
Q is explosive yield;
P is pressure load.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103926161B (en) * | 2014-03-19 | 2016-04-13 | 中国人民解放军总参谋部工程兵科研三所 | For the atmospheric air chamber multimembrane sheet driver of large-scale blast wave analogue means |
| CN105928425B (en) * | 2016-07-07 | 2017-07-21 | 宏大矿业有限公司 | A kind of primacord explosion velocity measurement apparatus and measuring method |
| CN108760536B (en) * | 2018-04-10 | 2020-12-11 | 东南大学 | Device and method for researching performance of pier under axial load and explosion action |
| CN109916706B (en) * | 2019-03-13 | 2021-05-04 | 中北大学 | Concrete solid support member antiknock performance test device |
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| GB1406471A (en) * | 1971-10-29 | 1975-09-17 | Dynamit Nobel Ag | Housings for simultaneous discharge of a plurality of payloads therefrom |
| CN101726573A (en) * | 2009-11-30 | 2010-06-09 | 浙江工业大学 | Combustible gas explosion experiment system |
| CN102519352A (en) * | 2011-12-15 | 2012-06-27 | 西北核技术研究所 | Method for measuring deformation of metal cylinders under internal explosion effect and device |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1406471A (en) * | 1971-10-29 | 1975-09-17 | Dynamit Nobel Ag | Housings for simultaneous discharge of a plurality of payloads therefrom |
| CN101726573A (en) * | 2009-11-30 | 2010-06-09 | 浙江工业大学 | Combustible gas explosion experiment system |
| CN102519352A (en) * | 2011-12-15 | 2012-06-27 | 西北核技术研究所 | Method for measuring deformation of metal cylinders under internal explosion effect and device |
Non-Patent Citations (3)
| Title |
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| 圆柱形爆炸容器壳体动力响应的研究;马圆圆;《万方学位论文全文数据库》;20080923;1-76 * |
| 平板封头圆柱形爆炸容器振动特性分析;年岗 等;《弹箭与制导学报》;20111231;第31卷(第6期);105-108 * |
| 薄壁柱壳在内部爆炸载荷下膨胀断裂的研究;高重阳 等;《爆炸与冲击》;20000430;第20卷(第2期);160-167 * |
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