bluemike
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explosive forming with water
Has anyone tried explosive forming? I have a book (can't find it right now) that describes how to do it. I've always thought it would be a neat way
to make art objects/statuary without having to melt and cast metal.
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hissingnoise
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Davis mentions explosive-forming in COPAE, based on the Monroe-effect (shaped-charges) and a woman whose name escapes me produces sculptures similarly
in Albuquerque (NM).
I'd imagine it's quite difficult though; availability of the materials being the first drawback.
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gnitseretni
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I've tried it a couple of times to make hemispherical copper liners for shaped charges. I cut out square pieces of copper that fit exactly over the
die (tool steel die from a punch and die set had from Harbor freight) and hot glued it to the die so water couldn't seep in. I then placed it inside a
1/4" thick steel bucket filled with water and hung a detonator (about .5g PETN) about 3 inches above the die. It was set off remotely.
It worked PERFECTLY the first time I did it!! Well, I mean it was perfect to the naked eye.(don't have a microscope ) Unfortunately, I believe it was more luck than anything else because I never
managed to get another one like it! (had to use a punch to smooth the other ones out)
I blame it on the fact that I didn't evacuate the air from underneath the copper sheet, which from what I read is how it's done. I don't know what
else it could be.
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hissingnoise
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| Quote: | Originally posted by gnitseretni
I've tried it a couple of times to make hemispherical copper liners for shaped charges. |
Did you use the hemi-liner in a charge, gnitseretin, and was it effective/a success?
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gnitseretni
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Yes, all of them worked fine. But then I only used it on 1/2" thick steel plate because that's the thickest I had to practice on. All of them had a
very short standoff (3/4" to an inch) except for one which as about 3' away from the target. It penetrated but the hole was half the size of the
others with many little craters all around.
Some pics..
Entry holes
Exit holes
Oh btw, that plate was cut in half with a LSC (aluminum liner)
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hissingnoise
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Really nice stuff, gnitseretni; axt will have to look to his laurels. . .
The bit of spalling in front might be from too small a stand-off.
Concave liners are the way to go for amateurs.
They could be shaped by vacuum as well as by explosive forming.
A concave rubber-lined die with a central hole for evacuation might fit the purpose.
[Edited on 30-1-2009 by hissingnoise]
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Mr. Wizard
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Many years ago while celebrating the 4th of July I remotely ignited some 'welding gas and oxidizing gas' in a 3 pound sheet metal coffee can with a
plastic lid. Most of the time the plastic lid was just blown off with a satisfying bang. I noticed the bottom of the can was formed to the pattern of
the asphalt street. I had ideas about doing some art with thin sheets of metal and laying objects under the metal and using plaster forms to create
metal wall coverings for my kitchen counter back-splash. Smaller pieces could be separately formed and then soldered or welded to a larger back
piece. I never did do any more with the idea.
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Contrabasso
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I think that would be very popular if you could post or link video and texts please
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