Science > Physics > "inverse shaped charge" to deliver a shock wave to an item?
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Science > Physics |
| User: |
"" |
| Date: |
27 Mar 2007 04:20:10 AM |
| Object: |
"inverse shaped charge" to deliver a shock wave to an item? |
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
.
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| User: "donald haarmann" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 12:03:03 PM |
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<dances_with_barkadas@yahoo.com
[snip]
| I'm wondering if it is possible to build a tank with a shape which
| would somehow focus the shockwave onto the objectwhile retaining the
| same amount of concussive power?
|
---------
No. The purpose of da water is too act as an "energy transmittal media."
See -
JS Rinehart & J Pearson
Explosive Working of Metals
Macmillan Co. NY 1963
Nothing to do with this, however, you may find interesting -
B Crossland
Explosive Welding of Metals and Its Application
Clarendon Press Oxford 1982
--
donald j haarmann
-----------------------------
Do you believe that the sciences would ever had
arisen and became great if there had not beforehand
been magicians, alchemists, astrologers and WiZards,
who thirsted and hungered after abscondite and
forbidden powers?
Friedrich Nietzsche
Die fröhliche Wissenschaft, IV, 1886
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| User: "Tom Biasi" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 04:27:02 AM |
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<dances_with_barkadas@yahoo.com> wrote in message
news:1174987210.203084.18600@d57g2000hsg.googlegroups.com...
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
How about building the tank like a parabolic bowl and putting the test
object at the focal point?
Tom
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| User: "Androcles" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 07:35:27 AM |
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"Tom Biasi" <tombiasi@********optonline.net> wrote in message =
news:Gr5Oh.143$Tv.80@newsfe12.lga...
=20
<dances_with_barkadas@yahoo.com> wrote in message=20
news:1174987210.203084.18600@d57g2000hsg.googlegroups.com...
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired =
value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
=20
How about building the tank like a parabolic bowl and putting the test =
object at the focal point?
=20
Tom
Good idea, but add another reflector with the charge at IT'S focus.
Then you have a parallel shock between reflectors and concentration
at the test site.
Secondly, of course, don't use explosives, use an oxy-acetylene
gas bubble and a sparkplug. The gas bubble size will be variable
and easily controlled.
.
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| User: "" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 06:40:43 AM |
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On Mar 27, 5:27 am, "Tom Biasi" <tombiasi@********optonline.net>
wrote:
<dances_with_barka...@yahoo.com> wrote in message
news:1174987210.203084.18600@d57g2000hsg.googlegroups.com...
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
How about building the tank like a parabolic bowl and putting the test
object at the focal point?
Tom
A parabolic shape would require the explosive charge to be at
infinity, hardly a cost cutting solution.
If the tank had a elliptical horizontal cross sectio, then placing the
charge at one focus and the product at the other would do the
trick...
.
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| User: "Don T." |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 10:45:48 AM |
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Not even infinity. If all the explosive force is aligned in parallel
fashion a remarkably small charge reflected from a properly designed
parabola will generate an enormous effect. Think flashlights and Satellite
TV dishes. Weak light source forms a tight beam, weak satellite signal is
focused onto a very small LNB as a nice, high quality signal. Same with your
explosive. Tiny charge placed similar to the bulb in a flashlight type
parabolic reflector and aimed at a satellite dish type reflector with the
object to be formed at the focus where the LNB would be normally placed will
amaze and delight your friends and acquaintances.
--
Don Thompson
Stolen from Dan: "Just thinking, besides, I watched 2 dogs mating once,
and that makes me an expert. "
There is nothing more frightening than active ignorance.
~Goethe
It is a worthy thing to fight for one's freedom;
it is another sight finer to fight for another man's.
~Mark Twain
~~~~~~~~~~~~~~~~~~~~~
<jmorriss@idirect.com> wrote in message
news:1174995643.610842.261870@r56g2000hsd.googlegroups.com...
On Mar 27, 5:27 am, "Tom Biasi" <tombiasi@********optonline.net>
wrote:
<dances_with_barka...@yahoo.com> wrote in message
news:1174987210.203084.18600@d57g2000hsg.googlegroups.com...
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
How about building the tank like a parabolic bowl and putting the test
object at the focal point?
Tom
A parabolic shape would require the explosive charge to be at
infinity, hardly a cost cutting solution.
If the tank had a elliptical horizontal cross sectio, then placing the
charge at one focus and the product at the other would do the
trick...
.
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| User: "Randy Poe" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 08:54:42 AM |
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On Mar 27, 7:40 am, "jmorr...@idirect.com" <jmorr...@idirect.com>
wrote:
On Mar 27, 5:27 am, "Tom Biasi" <tombiasi@********optonline.net>
wrote:
<dances_with_barka...@yahoo.com> wrote in message
news:1174987210.203084.18600@d57g2000hsg.googlegroups.com...
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
How about building the tank like a parabolic bowl and putting the test
object at the focal point?
Tom
A parabolic shape would require the explosive charge to be at
infinity, hardly a cost cutting solution.
Er, no. It would require the incoming shock waves to be
close to parallel. You can probably accomplish that
without actually putting the charge at infinity.
- Randy
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| User: "" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 05:22:37 PM |
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Do you for some reason believe that this post relates to prytechnics
and fireworks, or would be more properly posted in an explosives
related newsgroup?
Harry C.
On Mar 27, 5:20 am, wrote:
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
.
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| User: "The_Man" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 06:48:40 AM |
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On Mar 27, 4:20 am, wrote:
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
I was going to write no, since the force propagates through a fluid
equally in all directions (Pascal's Law). But it seems clear right
away that building the tank in something of a "funnel" would work,
exploding the charge at the narrow end. This is exactly the same
principle exploited in hydraulic brakes, where the force exerted on
the brake (small area) is transmitted equally to all surfaces (like
the brakes). The clasic demo of this is to fill a glass bottle with
water, then to smack it on the (narrow) top. The glass bottom of the
bottle will shatter immediately thereafter.
When I first saw the title of the thread, I thought that maybe you
were referring to the use of "shaped charges" to destroy tanks
(armored fighting vehicles). The principle in that case was first
developed by an American, and is called the Munroe effect. It was
first exploited in warfare by the Germans in 1942.
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| User: "Douglas Eagleson" |
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| Title: Re: "inverse shaped charge" to deliver a shock wave to an item? |
27 Mar 2007 10:41:32 AM |
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On Mar 27, 4:20 am, wrote:
to deliver a physical concussion to a certain class of industrial
objects in a batch-processing mode, the existing procedure is to use
an ordinary tank filled with water, and wrap the object in plastic/
rubber and detonate a small quantity of explosives suspended in the
water. The procedure works quite well to produce the desired value-
added effect.
To reduce costs, it is desired to cut down amount of explosives used
in each batch.
I'm wondering if it is possible to build a tank with a shape which
would somehow focus the shockwave onto the objectwhile retaining the
same amount of concussive power?
You need to work with the front side always of the method will not
work. Reflected waves will always be to slow. A structure of metal
placed between the object and the object's explosive charge, can
focus.
Think a grating affair of steel. A size of focus is then changable by
making the squares larger or smaller!
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