CN103353426A - Measuring device and method for axial load of column-shaped explosion container - Google Patents

Measuring device and method for axial load of column-shaped explosion container Download PDF

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Publication number
CN103353426A
CN103353426A CN2013102643646A CN201310264364A CN103353426A CN 103353426 A CN103353426 A CN 103353426A CN 2013102643646 A CN2013102643646 A CN 2013102643646A CN 201310264364 A CN201310264364 A CN 201310264364A CN 103353426 A CN103353426 A CN 103353426A
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screw rod
explosive
axial load
post shell
flat
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CN103353426B (en
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张德志
秦学军
徐海斌
史国凯
刘峻岭
杨军
熊琛
梁志刚
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Northwest Institute of Nuclear Technology
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Abstract

The invention provides a measuring device for the axial load of a column-shaped explosion container. The measuring device comprises a column shell, two flat plate end sockets, an explosive, an electric probe, screw rods, nuts, a strain gauge and a detonator, wherein the two flat plate end sockets are arranged on two ends of the column shell and provided with circular grooves, the explosive is placed on the center of the column shell, the electric probe adheres to the surface of the explosive, the screw rods and the nuts are used for fixedly connecting the two flat plate end sockets with the column shell, the strain gauge adheres to the screw rods, the detonator is used for detonating the explosive, the electric probe is connected with an oscilloscope through an explosion velocity instrument, and the strain gauge is connected with the oscilloscope through a strain instrument. According to the measuring device and the measuring method provided by the invention, scaling model examination can be performed on a large size column-shaped explosion container according to an explosion similarity law, so that the intensity designs of the end sockets and the screw rods are optimized, the experiment cost is low, and the practicability is high. The measuring device provided by the invention has an important significance for knowing the axial load of the column-shaped container under the action of internal explosion, and is simple in experiment principle and easy to operate.

Description

A kind of measurement mechanism of Cylindrical Explosion Vessel axial load and measuring method
Technical field
The invention belongs to the explosion mechanics technical field, relate to measurement mechanism and the measuring method of Cylindrical Explosion Vessel xial feed under the 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 can effectively seal explosion wave because of it and explosion product is widely used in scientific research, commercial production, dangerous material storage and the aspects such as transportation and anti-terrorism.Because cylindrical container can be easier to realize larger inner space that easy to process, cost is relatively cheap, obtains a wide range of applications.
Typical case's Cylindrical Explosion Vessel is comprised of the syndeton of column main cylinder, end cap and end socket and main cylinder, and explosion wave can apply very strong Axial pulsating load to container at the complex reflex at end cap place.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 also can affect the structural response of main cylinder on main cylinder.This shows that the research of Cylindrical Explosion Vessel axial load is of great significance for the Vessel Design tool.Relevant Cylindrical Explosion Vessel radial load and distribution vertically, the structural response under the Radial Loads etc. have been carried out a large amount of research, have no the report of axial load research.
Summary of the invention
The measurement mechanism and the measuring method that the purpose of this invention is to provide a kind 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 kind of measurement mechanism of Cylindrical Explosion Vessel axial load, its special character is: comprise post shell 1, be installed in post shell 1 two ends and with two flat-plate closures 4 of annular groove, be placed on post shell 1 center explosive 6, stick on explosive 6 surfaces electric probe 7, be used for being fixedly connected with two flat-plate closures 4 and post shell 1 screw rod 2 and nut 3, stick on foil gauge 9 on the screw rod 2, be used for the detonator 5 of fired charge 6; Described electric probe 7 links to each other with oscillograph 12 by detonation velocity meter 8, and described foil gauge 9 links to each other with oscillograph 12 by strainmeter.
A kind of measuring method of Cylindrical Explosion Vessel axial load, its special character is: may further comprise the steps:
1] flat-plate closure 4 is fixed on the two ends of post shell 1 with screw rod 2 and nut 3;
2] explosive in the ignition post shell 1;
3] electric probe 7 on explosive 6 surfaces obtains the accurate moment pulse waveform that explosive 6 detonates by detonation velocity meter 8 at oscillograph 12, thereby obtains blast load in the correct time sequence of post shell 1 interior effect; Simultaneously, the foil gauge 9 on the screw rod 2 obtains stress on the screw rod 2 on the screw rod 2 by strainmeter 11 at oscillograph 12, thereby obtains acting on the power of screw rod 2, then obtains axial load mean value on the flat-plate closure 4:
P aver=nEεS 1/S 2
In the formula:
N is screw rod quantity;
E is screw rod 2 elasticity modulus of materials;
ε is strain value on the single screw rod 2; ,
S 1Be screw rod 2 sectional areas;
S 2Be end socket 4 projected areas.
A kind of measuring method of Cylindrical Explosion Vessel axial load, its special character is: may further comprise the steps:
1] according to the blast likelihood, 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] flat-plate closure 4 is fixed on the two ends of post shell 1 with screw rod 2 and nut 3;
3] explosive in the ignition post shell 1;
4] electric probe 7 on explosive 6 surfaces obtains the accurate moment pulse waveform that explosive 6 detonates by detonation velocity meter 8 at oscillograph 12, thereby obtains blast load in the correct time sequence of post shell 1 interior effect; Simultaneously, the foil gauge 9 on the screw rod 2 obtains stress on the screw rod 2 on the screw rod 2 by strainmeter 11 at oscillograph 12, thereby obtains acting on the power of screw rod 2, then obtains axial load mean value on the flat-plate closure 4:
P aver=nEεS 1/S 2
In the formula:
N is screw rod quantity;
E is screw rod 2 elasticity modulus of materials;
ε is strain value on the single screw rod 2; ,
S 1Be screw rod 2 sectional areas;
S 2Be end socket 4 projected areas;
5] according to the axial load mean value of following contracting than ratio relation calculating prototype:
L∝1/η；t∝1/η；Q∝1/η 1/3；P∝1 (2)
In the formula:
L represents physical dimension;
η compares ratio for contracting;
T is time quantum;
Q is that 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 being familiar with cylindrical container under the internal explosion effect.
2, the present invention studies measurement mechanism and the measuring method of Cylindrical Explosion Vessel axial load, and experimental principle is simple, operates easily.
3, the present invention utilizes similitude law of blast to carry out the scale model examination to large-sized Cylindrical Explosion Vessel by measurement mechanism and the measuring method of Cylindrical Explosion Vessel axial load, optimizes the Intensity Design of end socket and screw rod, and experimental expenses is low, and is practical.
4, the present invention measures to load inner detonation lower prop columella by the strain on the screw rod, it is with a high credibility that the strain signal high conformities that many screw rods are measured, the mean strain waveform that records by screw rod are studied the method for Cylindrical Explosion Vessel axial load.
Description of drawings
Fig. 1 is Cylindrical Explosion Vessel axial load measurement mechanism synoptic diagram;
Fig. 2 is screw rod mean strain waveform synoptic diagram;
Fig. 3 is end cap average load waveform synoptic diagram;
Reference numeral: 1-post shell; The 2-screw rod; The 3-nut; The 4-flat-plate closure; The 5-detonator; The 6-explosive; The 7-electric probe; The 8-detonation velocity meter; The 9-foil gauge; 10-bridge box; The 11-strainmeter; The 12-oscillograph.
Embodiment
The measurement mechanism of Cylindrical Explosion Vessel xial feed is as follows under the internal explosion effect:
At the post shell 1 center explosive 6 of wall thickness h, inside radius R, long L, paste electric probe 7 on explosive 6 surfaces.Post shell 1 two ends are installed in the flat-plate closure 4 with annular groove, and two flat-plate closures 4 link to each other with nut 3 by uniform screw rod 2, utilize screw rod 2 and nut 3 that flat-plate closure 4 and post shell 1 are connected and fixed, and paste foil gauge at screw rod 2.By detonator 5 fired charges 6, the electric probe 7 on explosive 6 surfaces can obtain the accurate moment pulse waveform that explosive 6 detonates by detonation velocity meter 8 on oscillograph 12, thus can the interpretation blast load in the correct time sequence of post shell 1 interior effect.The signal that foil gauge 9 on the screw rod 2 is measured is stored on the oscillograph 12 through gap bridge box 10 and strainmeter 11, by the strain waveform on the screw rod 2 of measuring, can obtain the stress on the screw rod 2, obtain acting on the power of screw rod 2 by the stress on the screw rod 2, just can obtain axial load mean value on the end socket 4.
P aver=nEεS 1/S 2 （1）
In the formula:
N is screw rod quantity;
E is screw rod 2 elasticity modulus of materials;
ε is strain value on the single screw rod 2; ,
S 1Be screw rod 2 sectional areas;
S 2Be end socket 4 projected areas.
For the container that equivalent is large, physical dimension is larger, can according to the blast likelihood, determine the axial load size by scale model in the design phase.When the material of prototype and model was consistent, basic contracting than the ratio relation was:
L∝1/η；t∝1/η；Q∝1/η 1/3；P∝1 (2)
In the formula:
L represents physical dimension;
η compares ratio for contracting;
T is time quantum;
Q is explosive yield;
P is pressure load.
(2) formula represents that physical dimension, the time quantum of scale model are 1/ η of prototype, and explosive yield is 1/ η of prototype 1/3, the amount of pressure of prototype and scale model equates.
The measuring method of Cylindrical Explosion Vessel xial feed is as follows under the internal explosion effect:
1) design post columella is to load device, and Fig. 1 is Cylindrical Explosion Vessel axial load measurement mechanism synoptic 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 the 180gTNT equivalent.
2) lay the explosive of 180gTNT equivalent at the steel cylinder center, paste electric probe at the 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) design screw rod quantity is 6, and the diameter of section of screw rod is 20mm, guarantees during installation that the pretightning force of every screw rod is consistent; In order to improve the quality of measurement data, on every screw rod, all paste foil gauge, and symmetric double work tablet mode is adopted in the strain measurement of single screw rod.Foil gauge 9 is connected connection by quad with the bridge box, the bridge box is connected with strainmeter 11, and strainmeter is connected with oscillograph 12 by concentric cable, and the 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 the blasting cap initiation explosive, the electric probe signal can accurately be determined explosive charge constantly, and then can obtain the correct time sequence of Explosion Loading.
6) measure by experiment strain waveform on the screw rod, obtain screw rod mean strain waveform through processing, as shown in Figure 2, under the detonation of 180gTNT equivalent, the strain peak value that single screw rod is measured is 5100 μ ε, can obtain the stress that screw rod is subject to by the elasticity Hooke's law; The average load waveform of end cap as shown in Figure 3, the maximum axial of end cap is 250MPa, namely obtains the axial load of post shell internal explosion.

Claims (3)

1. the measurement mechanism of a Cylindrical Explosion Vessel axial load is characterized in that: comprise post shell (1), be installed in post shell (1) two ends and with two flat-plate closures (4) of annular groove, be placed on post shell (1) center explosive (6), stick on explosive (6) surface electric probe (7), be used for being fixedly connected with two flat-plate closures (4) and post shell (1) screw rod (2) and nut (3), stick on foil gauge (9) on the screw rod (2), for the detonator (5) of fired charge (6); Described electric probe (7) links to each other with oscillograph (12) by detonation velocity meter (8), and described foil gauge (9) links to each other with oscillograph (12) by strainmeter.
2. the measuring method of a Cylindrical Explosion Vessel axial load is characterized in that: may further comprise the steps:
1] flat-plate closure (4) is fixed on the two ends of post shell (1) with screw rod (2) and nut (3);
2] ignite the interior explosive of post shell (1);
3] electric probe (7) on explosive (6) surface obtains the accurate moment pulse waveform that explosive (6) detonates by detonation velocity meter (8) at oscillograph (12), thereby obtains the correct time sequence that blast load acts in post shell (1); Simultaneously, foil gauge (9) on the screw rod (2) obtains stress on the screw rod (2) on the screw rod (2) by strainmeter (11) at oscillograph (12), thereby obtain acting on the power of screw rod (2), then obtain the upper axial load mean value of flat-plate closure (4):
P aver=nEεS 1/S 2
In the 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 1Be screw rod (2) sectional area;
S 2Be end socket (4) projected area.
3. the measuring method of a Cylindrical Explosion Vessel axial load is characterized in that: may further comprise the steps:
1] according to the blast likelihood, 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] flat-plate closure (4) is fixed on the two ends of post shell (1) with screw rod (2) and nut (3);
3] ignite the interior explosive of post shell (1);
4] electric probe (7) on explosive (6) surface obtains the accurate moment pulse waveform that explosive (6) detonates by detonation velocity meter (8) at oscillograph (12), thereby obtains the correct time sequence that blast load acts in post shell (1); Simultaneously, foil gauge (9) on the screw rod (2) obtains stress on the screw rod (2) on the screw rod (2) by strainmeter (11) at oscillograph (12), thereby obtain acting on the power of screw rod (2), then obtain the upper axial load mean value of flat-plate closure (4):
P aver=nEεS 1/S 2
In the 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 1Be screw rod (2) sectional area;
S 2Be end socket (4) projected area;
5] according to the axial load mean value of following contracting than ratio relation calculating prototype:
L∝1/η；t∝1/η；Q∝1/η 1/3；P∝1 (2)
In the formula:
L represents physical dimension;
η compares ratio for contracting;
T is time quantum;
Q is explosive yield;
P is pressure load.
CN201310264364.6A 2013-06-27 2013-06-27 A kind of measurement mechanism of Cylindrical Explosion Vessel axial load and measuring method Active CN103353426B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103926161A (en) * 2014-03-19 2014-07-16 中国人民解放军总参谋部工程兵科研三所 Atmosphere chamber multi-diaphragm driver for large scale blast wave simulation equipment
CN105928425A (en) * 2016-07-07 2016-09-07 宏大矿业有限公司 Detonating speed measuring device and method of detonating fuse
CN108760536A (en) * 2018-04-10 2018-11-06 东南大学 The device and method for studying bridge pier performance under xial feed and detonation
CN109916706A (en) * 2019-03-13 2019-06-21 中北大学 A kind of experimental rig of the clamped component capability of antidetonance of concrete

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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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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103926161A (en) * 2014-03-19 2014-07-16 中国人民解放军总参谋部工程兵科研三所 Atmosphere chamber multi-diaphragm driver for large scale blast wave simulation equipment
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
CN105928425A (en) * 2016-07-07 2016-09-07 宏大矿业有限公司 Detonating speed measuring device and method of detonating fuse
CN108760536A (en) * 2018-04-10 2018-11-06 东南大学 The device and method for studying bridge pier performance under xial feed and detonation
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
CN109916706A (en) * 2019-03-13 2019-06-21 中北大学 A kind of experimental rig of the clamped component capability of antidetonance of concrete

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