CN103837117A - Method for determining thickness of wall of container for simulating explosion test in deepwater environment - Google Patents

Method for determining thickness of wall of container for simulating explosion test in deepwater environment Download PDF

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CN103837117A
CN103837117A CN201410104407.9A CN201410104407A CN103837117A CN 103837117 A CN103837117 A CN 103837117A CN 201410104407 A CN201410104407 A CN 201410104407A CN 103837117 A CN103837117 A CN 103837117A
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container
wall
explosive
shell
thickness
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CN103837117B (en
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钟冬望
李琳娜
何理
司剑峰
朱宽
刘建程
黄小武
殷秀红
操鹏
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Wuhan University of Science and Engineering WUSE
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Abstract

The invention relates to a method for determining the thickness of the wall of a container for simulating an explosion test in a deepwater environment. According to the technical scheme, under the conditions that the constraint condition of the container (the container is called for short) for simulating the explosion test in the deepwater environment, the simulated water depth, the allowable powder charging amount, the container structure, the container size and the container materials are known, a model (please see the formula in the specification) for determining the thickness of the wall of the container for simulating the explosion test in the deepwater environment is built, and then the thickness delta e of the wall of the container is obtained according to the model for determining the thickness of the wall of the container. The method has the advantages of being capable of meeting actual bearing requirements and lowering processing cost, and being safe, reliable and convenient to use.

Description

A kind of simulation deepwater environment thick definite method of wall of a container for explosive test
Technical field
The invention belongs to explosive test container technical field.Be specifically related to a kind of thick definite method of simulation deepwater environment explosive test wall of a container.
Background technology
Along with underwater blast application more and more widely in military affairs, economic construction, rationally utilize underwater blast energy effectively to destroy target, in complicated underwater blast environment, hydraulic facility and buildings are taked to effective protection, reduce to greatest extent the problems such as blast negative effect, become the problem that blasting engineering application and institutions for academic research are generally concerned about.Because the mechanism of action of underwater blast is very complicated, only have minority problem to have analytic solution, and the complex environment of underwater blast also caused Underwater Explosion test research cycle long, expend many, success ratio is low, the poor operability of test observation, and Underwater Explosion test belongs to destructive test mostly, the data that test obtains are very limited.Simulation deepwater environment explosive test is exactly in closed container, to fill aqueous medium, simulate different depth conditions by loading a constant static-pressure, utilize little dose to carry out a kind of Underwater Explosion test equipment of explosive underwater blast action rule research with container.This equipment can carry out explosive test at safe and reliable, high frequency simulation underwater environment in experimental enviroment easily; can also limit the reach of underwater blast wave and detonation product, and testing crew and testing equipment are effectively closely protected.Compared with the natural water area test condition of field, it has advantages of, and test apparatus is convenient to lay, test figure is convenient to gather, test external condition controllability is strong.Diameter, wall thickness and the relation between dosage that makes of container for the explosive test of how to confirm simulation deepwater environment, have important theory significance and practical value for guaranteeing to simulate the safe handling of deepwater environment explosive test container and give full play to its usefulness.
At present, to simulation deepwater environment, explosive test is mainly using underwater blast wave reflection overpressure peak value as working pressure by the thick definite method of wall of a container, and dynamic coefficient method conventional while determining according to explosive container wall thickness is determined.Mainly there are following two difficult points in existing method: first, underwater blast is compared with blast in air, the peak value of shock wave is larger, but the positive pressure time is shorter, be only in equal peak value air shock wave 1/100, if directly using shock reflection peak overpressure as working pressure, according to air dielectric explosive container wall thickness determine method carry out wall thickness determine, determined wall thickness value can be very large, thereby be difficult to obtain practical application; The second, the selection of dynamic coefficient generally, according to designer's practical experience, often has certain blindness, cannot obtain suitable wall thickness.Therefore, existing simulation deepwater environment explosive test is difficult to implement by the thick definite method of wall of a container.
Summary of the invention
The present invention is intended to overcome prior art defect, object is to provide a kind of thick definite method of simulation deepwater environment explosive test wall of a container, with the definite simulation deepwater environment explosive test wall of a container of the method thickly can meet actual bearer needs, can cut down finished cost, safe and reliable and easy to use.
For realizing above-mentioned task, technical scheme of the present invention comprises the following steps:
The technical parameter of step 1, definite simulation deepwater environment container (or being called for short container) for explosive test
1. structure of container: container is axially symmetric structure, is spherical structure or the cylindrical structural of serve as reasons middle part cylinder straight section and two ends standard elliptical head composition;
2. container dimensional: the efficiency test space in shell;
3. simulate the depth of water: the degree of depth of the water when static pressure that the pressure that object born under water loads after being full of water with container equates, the pressure of every 10m depth of water is equivalent to standard atmospheric pressure, i.e. a 0.1MPa;
4. allow explosive load: the TNT equivalent of the maximum blast load that internal tank center position can bear does not occur at container under the prerequisite of plastic yield;
5. container material: container body material is Q345R steel or is Q245R steel;
6. constraint condition: shell is thin-wall barrel, thin-wall barrel refers to the simulation deepwater environment explosive test cylindrical shell thickness of container and ratio≤0.2 of the radius-of-curvature of described cylinder inboard wall.
Step 2, the foundation simulation deepwater environment thick definite model of wall of a container for explosive test
δ e 1 2 E { ( σ t ) 2 [ p c ( 2 R + δ e ) 2 δ e ] 2 } = m W 3 ( W 3 R ) γ × 10 6 + Rp c E [ δ t - p c ( 2 R + δ e ) 2 δ e ] - - - ( 1 )
In formula (1): the internal diameter that R is shell, m;
W is for allowing explosive load, kg;
M and γ are underwater blast parameter;
P cfor allowing to load static pressure, Pa;
E is the elastic modulus of shell material, Pa;
σ tfor the permissible stress of shell material, Pa;
δ efor the thickness of shell, wall of a container is thick, m.
Step 3, by formula (1), obtain the thick δ of described simulation deepwater environment explosive test wall of a container e.
Described permission loads static pressure p cwhen simulation deepwater environment explosive test container is in the time being full of water, under the blast load of the permission explosive load W of internal tank center position, the maximum load static pressure p that container bears when plastic yield not occurring and leaking c.
The value of described underwater blast parameter m and γ is:
When explosive type is TNT, m=0.083, γ=2.05;
When explosive type is PETN, m=0.171, γ=2.16;
When explosive type is TNT50/PETN50, m=0.106, γ=2.12;
Convert according to the principle of similitude, obtain explosive parameters m and the γ of other explosive types.
The permissible stress σ of described shell material trelevant with cylinder material and the thickness of container:
1) cylinder material of container is Q245R
The thickness δ of shell ewhile being 6～16mm, permissible stress σ tfor 133MPa;
The thickness δ of shell ewhile being 16～36mm, permissible stress σ tfor 132MPa;
The thickness δ of shell ewhile being 36～60mm, permissible stress σ tfor 126MPa.
2) shell material is Q345R
The thickness δ of shell ewhile being 6～16mm, permissible stress σ tfor 170MPa;
The thickness δ of shell ewhile being 16～36mm, permissible stress σ tfor 163MPa;
The thickness δ of shell ewhile being 36～60mm, permissible stress σ tfor 157MPa.
Owing to adopting technique scheme, the present invention compared with prior art tool has the following advantages:
The first, the explosive test of existing simulation deepwater environment is directly using underwater blast wave reflection overpressure peak value as working pressure by the thick definite method of wall of a container, adopting dynamic coefficient method to carry out wall thickness determines, wherein the selection of dynamic coefficient is to determine according to test and experience, and leave sufficient redundancy, can cause so the thick value of wall of a container excessive, increase processing cost.The thick definite model of wall of a container for the simulation deepwater environment explosive test that the present invention sets up, can obviously reduce with wall of a container is thick by the explosive test of the determined simulation deepwater environment of this model.Statistics shows, the determined wall thickness of definite method that adopts wall thickness of the present invention is only 40～70% of the determined wall thickness of prior art, can not only significantly reduce the processing cost of simulation deepwater environment explosive test container, and due to lightweight and easy to use.
The second, wall of a container thick definite model for the explosive test of simulation deepwater environment that the present invention sets up, does not need artificially to determine dynamic coefficient, has reduced the subjective factor in design process, makes definite method of described wall thickness more simple, accurately and reliably.
Three, be processed into simulation deepwater environment explosive test container according to the definite wall thickness of the method for the invention, this container is carried out to security test test, test findings shows that described container plastic yield does not occur and leaks, absolutely prove that the method for the invention can not only meet actual bearer needs, and safe and reliable.
Therefore, the present invention have can meet actual bearer needs, can cut down finished cost, feature safe and reliable and easy to use.
Embodiment
Below in conjunction with embodiment, the invention will be further described, not the restriction to its protection domain.
For avoiding repetition, first technical parameter unification related this embodiment is described below, in embodiment, repeat no more:
Described permission loads static pressure p cwhen simulation deepwater environment explosive test container is in the time being full of water, under the blast load of the permission explosive load W of internal tank center position, the maximum load static pressure p that container bears when plastic yield not occurring and leaking c.
The value of described underwater blast parameter m and γ is:
When explosive type is TNT, m=0.083, γ=2.05;
When explosive type is PETN, m=0.171, γ=2.16;
When explosive type is TNT50/PETN50, m=0.106, γ=2.12;
Convert according to the principle of similitude, obtain explosive parameters m and the γ of other explosive types.
The permissible stress σ of described shell material trelevant with cylinder material and the thickness of container:
1) cylinder material of container is Q245R
The thickness δ of shell ewhile being 6～16mm, permissible stress σ tfor 133MPa;
The thickness δ of shell ewhile being 16～36mm, permissible stress σ tfor 132MPa;
The thickness δ of shell ewhile being 36～60mm, permissible stress σ tfor 126MPa.
2) shell material is Q345R
The thickness δ of shell ewhile being 6～16mm, permissible stress σ tfor 170MPa;
The thickness δ of shell ewhile being 16～36mm, permissible stress σ tfor 163MPa;
The thickness δ of shell ewhile being 36～60mm, permissible stress σ tfor 157MPa.
Embodiment 1
A kind of simulation deepwater environment thick definite method of wall of a container for explosive test.Its concrete steps are:
The technical parameter of step 1, definite simulation deepwater environment container (or being called for short container) for explosive test
1. structure of container: container is axially symmetric structure, the cylindrical structural of serve as reasons middle part cylinder straight section and two ends standard elliptical head composition;
2. container dimensional: the efficiency test space in shell, is specifically of a size of Ф 2000mm × 3000mm(containing ellipse head part);
3. simulate the depth of water: the degree of depth of the water when static pressure that the pressure that object born under water loads after being full of water with container equates, the simulation depth of water of the present embodiment is 200m, being the loading hydrostatic pressing that container is full of after water is 2MPa;
4. allow explosive load: do not occur at container under the prerequisite of plastic yield, the maximum blast load that internal tank center position can bear is 0.01kgTNT equivalent;
5. container material: container body material is Q345R steel;
6. constraint condition: shell is thin-wall barrel, thin-wall barrel refers to the simulation deepwater environment explosive test cylindrical shell thickness of container and ratio≤0.2 of the radius-of-curvature of described cylinder inboard wall.
Step 2, the foundation simulation deepwater environment thick definite model of wall of a container for explosive test
δ e 1 2 E { ( σ t ) 2 [ p c ( 2 R + δ e ) 2 δ e ] 2 } = m W 3 ( W 3 R ) γ × 10 6 + Rp c E [ δ t - p c ( 2 R + δ e ) 2 δ e ] - - - ( 1 )
In formula (1): the internal diameter that R is shell, R=1m;
W is for allowing explosive load, W=0.01kg;
M and γ are underwater blast parameter, m=0.083, γ=2.05;
P cfor allowing to load hydrostatic pressing, p c=2 × 10 6pa;
E is the elastic modulus of shell material, E=2 × 10 11pa;
σ tfor the permissible stress of shell material, σ t=163 × 10 6pa;
δ efor the thickness δ of shell e, wall of a container is thick, m.
Step 3, by formula (1), must simulate deepwater environment explosive test wall of a container thick δ e
δ e≈0.028m。
The determined container wall thickness of the present embodiment is 28mm.Compared with definite method of container wall thickness of the prior art, container wall thickness significantly reduces.As the technical parameter with container according to the definite simulation deepwater environment explosive test of the present embodiment, using shock reflection peak overpressure in water as working pressure, selecting dynamic coefficient is 2, and determined container wall thickness is 61mm.Visible, adopting the determined wall thickness of definite method of wall thickness described in the present embodiment is only 46% of the determined wall thickness of prior art.
According to container wall thickness δ definite in the present embodiment e≈ 0.028m is processed into simulation deepwater environment explosive test container, again it is carried out to security test test, test findings shows: this simulation deepwater environment explosive test is that the explosive of 2MPa and internal tank center position is while being 0.01kgTNT equivalent with container being full of loading static pressure after water, after blast, there is not plastic yield and leak, the thick δ of this wall of a container is described e≈ 0.028m meets actual needs.
Embodiment 2
A kind of simulation deepwater environment thick definite method of wall of a container for explosive test.Its concrete steps are:
The technical parameter of step 1, definite simulation deepwater environment container (or being called for short container) for explosive test
1. structure of container: container is axially symmetric structure, container body is spherical structure;
2. container dimensional: the efficiency test space in shell, diameter is 3000mm;
3. simulate the depth of water: the degree of depth of the water when static pressure that the pressure that object born under water loads after being full of water with container equates, the simulation depth of water of the present embodiment is 300m, being the loading hydrostatic pressing that container is full of after water is 3MPa;
4. allow explosive load: do not occur at container under the prerequisite of plastic yield, the maximum blast load that internal tank center position can bear is 0.05kgTNT equivalent;
5. container material: container body material is Q245R steel;
6. constraint condition: shell is thin-wall barrel, thin-wall barrel refers to the simulation deepwater environment explosive test cylindrical shell thickness of container and ratio≤0.2 of the radius-of-curvature of described cylinder inboard wall.
Step 2, the foundation simulation deepwater environment thick definite model of wall of a container for explosive test
δ e 1 2 E { ( σ t ) 2 [ p c ( 2 R + δ e ) 2 δ e ] 2 } = m W 3 ( W 3 R ) γ × 10 6 + Rp c E [ δ t - p c ( 2 R + δ e ) 2 δ e ] - - - ( 1 )
In formula (1): the internal diameter that R is shell, R=1.5m;
W is for allowing explosive load, W=0.05kg;
M and γ are underwater blast parameter, m=0.083, γ=2.05;
P cfor allowing to load hydrostatic pressing, p c=3 × 10 6pa;
E is the elastic modulus of shell material, E=2.1 × 10 11pa;
σ tfor the permissible stress of shell material, σ t=157 × 10 6pa;
δ efor the thickness δ of shell e, wall of a container is thick, m.
Step 3, by formula (1), must simulate deepwater environment explosive test wall of a container thick δ e
δ e≈0.076m。
The determined container wall thickness of the present embodiment is 76mm.And compared with definite method of container wall thickness of the prior art, container wall thickness significantly reduces, as used the technical parameter of container according to the definite simulation deepwater environment explosive test of the present embodiment, using shock reflection peak overpressure in water as working pressure, selecting dynamic coefficient is 2, and determined container wall thickness reaches 112mm.Visible, adopt the determined wall thickness of definite method of wall thickness described in the present embodiment only for adopting 68% of the determined wall thickness of prior art.
According to container wall thickness δ definite in the present embodiment e≈ 0.076m is processed into simulation deepwater environment explosive test container, it has been carried out to security test test, test findings shows: this simulation deepwater environment explosive test is that the explosive of 3MPa and internal tank center position is while being 0.05kgTNT equivalent with container being full of loading hydrostatic pressing after water, after blast, there is not plastic yield and leak, the thick δ of this wall of a container is described e≈ 0.076m meets actual needs.
This embodiment compared with prior art tool has the following advantages:
The first, the explosive test of existing simulation deepwater environment is directly using underwater blast wave reflection overpressure peak value as working pressure by the thick definite method of wall of a container, adopting dynamic coefficient method to carry out wall thickness determines, wherein the selection of dynamic coefficient is to determine according to test and experience, and leave sufficient redundancy, can cause so the thick value of wall of a container excessive, increase processing cost.The thick definite model of wall of a container for the simulation deepwater environment explosive test that this embodiment is set up, can obviously reduce with wall of a container is thick by the explosive test of the determined simulation deepwater environment of this model.Statistics shows, the determined wall thickness of definite method that adopts wall thickness described in this embodiment is only 40～70% of the determined wall thickness of prior art, can not only significantly reduce the processing cost of simulation deepwater environment explosive test container, and due to lightweight and easy to use.
The thick definite model of wall of a container for the simulation deepwater environment explosive test of the second, setting up in this embodiment, does not need artificially to determine dynamic coefficient, has reduced the subjective factor in design process, makes definite method of described wall thickness simpler, accurate and reliable.
Three, the simulation deepwater environment explosive test container of processing according to the definite wall thickness of method described in this embodiment is carried out to security test test, test findings absolutely proves described in this embodiment that method can not only meet actual bearer needs, and plastic yield does not occur and leak.
Therefore, this embodiment have can meet actual bearer needs, can cut down finished cost, feature safe and reliable and easy to use.

Claims (4)

1. simulation thick definite method of wall of a container for deepwater environment explosive test, is characterized in that described wall thickness determines that the concrete steps of method are:
Step 1, the explosive test of the definite simulation deepwater environment technical parameter of container
The explosive test of described simulation deepwater environment is with container or be called for short container;
1. structure of container: container is axially symmetric structure, is spherical structure or the cylindrical structural of serve as reasons middle part cylinder straight section and two ends standard elliptical head composition;
2. container dimensional: the efficiency test space in shell;
3. simulate the depth of water: the degree of depth of the water when static pressure that the pressure that object born under water loads after being full of water with container equates, the pressure of every 10m depth of water is equivalent to standard atmospheric pressure, i.e. a 0.1MPa;
4. allow explosive load: the TNT equivalent of the maximum blast load that internal tank center position can bear does not occur at container under the prerequisite of plastic yield;
5. container material: container body material is Q345R steel or is Q245R steel;
6. constraint condition: shell is thin-wall barrel, thin-wall barrel refers to the simulation deepwater environment explosive test cylindrical shell thickness of container and ratio≤0.2 of the radius-of-curvature of described cylinder inboard wall;
Step 2, the foundation simulation deepwater environment thick definite model of wall of a container for explosive test
δ e 1 2 E { ( σ t ) 2 [ p c ( 2 R + δ e ) 2 δ e ] 2 } = m W 3 ( W 3 R ) γ × 10 6 + Rp c E [ δ t - p c ( 2 R + δ e ) 2 δ e ] - - - ( 1 )
In formula (1): the internal diameter that R is shell, m;
W is for allowing explosive load, kg;
M and γ are underwater blast parameter;
P cfor allowing to load static pressure, Pa;
E is the elastic modulus of shell material, Pa;
σ tfor the permissible stress of shell material, Pa;
δ efor the thickness of shell, wall of a container is thick, m;
Step 3, by formula (1), obtain the thick δ of described simulation deepwater environment explosive test wall of a container e.
2. the thick definite method of wall of a container for simulation deepwater environment explosive test according to claim 1, is characterized in that described permission loads static pressure p cwhen simulation deepwater environment explosive test container is in the time being full of water, under the blast load of the permission explosive load W of internal tank center position, the maximum load static pressure p that container bears when plastic yield not occurring and leaking c.
3. the thick definite method of wall of a container for simulation deepwater environment explosive test according to claim 1, is characterized in that the value of described underwater blast parameter m and γ is:
When explosive type is TNT, m=0.083, γ=2.05;
When explosive type is PETN, m=0.171, γ=2.16;
When explosive type is TNT50/PETN50, m=0.106, γ=2.12;
Convert according to the principle of similitude, obtain explosive parameters m and the γ of other explosive types.
4. the thick definite method of wall of a container for simulation deepwater environment explosive test according to claim 1, is characterized in that the permissible stress σ of described shell material trelevant with cylinder material and the thickness of container:
1) cylinder material of container is Q245R
The thickness δ of shell ewhile being 6～16mm, permissible stress σ tfor 133MPa;
The thickness δ of shell ewhile being 16～36mm, permissible stress σ tfor 132MPa;
The thickness δ of shell ewhile being 36～60mm, permissible stress σ tfor 126MPa;
2) shell material is Q345R
The thickness δ of shell ewhile being 6～16mm, permissible stress σ tfor 170MPa;
The thickness δ of shell ewhile being 16～36mm, permissible stress σ tfor 163MPa;
The thickness δ of shell ewhile being 36～60mm, permissible stress σ tfor 157MPa.
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Assignor: WUHAN University OF SCIENCE AND TECHNOLOGY

Contract record no.: X2023980036415

Denomination of invention: A Method for Determining the Wall Thickness of Containers for Simulating Deepwater Environment Explosion Tests

Granted publication date: 20160713

License type: Common License

Record date: 20230609

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