Justin
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Martini glass SC?
I have two martini glasses both with a diameter of 4.5in at the rim. I want to break off the stem and use it in a SC, my only concerns are with the
inconsistant thickness of the glass. I have some 4in PVC pipe to confine the explosive however some glass will overhang outside the pipe, will this
have much impact on the performance of the SC? A martini glass was an obvious choice for a glass lined SC since it's conical, cheap and easily
obtainable. Thanks everyone for your input.
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Paddywhacker
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You want to use a snapped-off glass in your own Superior Colliculus, or somebody elses? I hope you know what you are doing.
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devongrrl
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I wonder if it is possible to use disposable plastic martini glasses for this ? For one thing they are cheaper!
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psychokinetic
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Whoosh. Over my head.
What's an SC? Yes, I tried to find out myself first.
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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gnitseretni
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Uhm, we have a HUGE SC thread, why didn't you post in there?
As for your question, the overhang won't be a problem. Sometimes, with small charges, it even comes in handy as it can serve as standoff.
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Justin
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SC=Shaped Charge, Ya i realize there is a huge SC thread, i just thought it'd get more attention as a new thread.
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Rain
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 This is one of the reasons I loved Roguesci.Those moderators would instantly ban
a person wasting space by posting a new thread like this.
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devongrrl
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We don't have Nazis here, all our mods are intelligent and capable.
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hissingnoise
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It's not easy to find anal-retentiveness lovable. . .
How do you do it?
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Rain
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I thought flaming was against the forum rules.It must be some past-bound anger.Maybe from being banned previously?Who knows...
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hissingnoise
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| Quote: | | Maybe from being banned previously?Who knows... |
Yaaay. . . And on my first post. . .
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Sedit
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Quote: Originally posted by Rain  | | This is one of the reasons I loved Roguesci.Those moderators would instantly ban
a person wasting space by posting a new thread like this. |
Really? Thats why you love RS? Because this is your first post and even thru my beer goggles it seems way more worthless then the opening post. If
this was the site you love so much you would be banned way quicker then the person that started this thread so please kindly Shut the fuck up!
Knowledge is useless to useless people...
"I see a lot of patterns in our behavior as a nation that parallel a lot of other historical processes. The fall of Rome, the fall of Germany — the
fall of the ruling country, the people who think they can do whatever they want without anybody else's consent. I've seen this story
before."~Maynard James Keenan
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Justin
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. Never heard of a plastic lined SC, not sure how it would react to the extremes of a SC. Only way to know for sure is to try it!
But hey I only paid $5 for two martini glasses new. I'm sure u could find some used ones for wayy cheaper. Better stick with proven materials like
copper, steel and glass IMO but I highly encourage experimentalism!!!
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Microtek
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In "Liners for Shaped Charges", Held uses a ranking of liner materials based on maximum jet speed times the square root of the liner density. He
further states that, as a rough approximation, max jet speed can be estimated as 2.34 times "bulk sound velocity" of the liner material.
Now, I'm not entirely certain of what he means by bulk sound velocity, but from the numbers in the table (table 1) it seems to be the speed of
longitudinal waves.
The speed of longitudinal waves can be calculated if shear and bulk moduli or Young modulus and Poisson ratio are known, but the interesting point is
that the formula features the square root of the density in the denominator.
In the ranking formula, this cancels out with the square root (density) factor.
This means that as a means of ranking liner materials, you can simply use the square root of (K+ 4G/3), where K is the bulk modulus and G is the shear
modulus. Or you could look up longitudinal sound velocity and multiply that with the square root of the density.
As an even simpler (and less accurate) method you could just use the square root of Youngs modulus.
There are probably many aberrations that would deviate from this ranking system (for instance, it rates steel higher than copper), but it accurately
predicts several well known phenomena such as the fact that lead is very poor, that aluminum is decent and so is glass.
@ Devongrrl:
From this, it should be apparent that no polymeric material is suitable as a shaped charge liner. However, many ceramic materials are quite effective.
An interesting test of the extremes of this rule of thumb would be to try a diamond liner.....
[Edited on 31-5-2010 by Microtek]
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Randle Patrick
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Haw
Let's not get all tectumological here.
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VladimirLem
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It definitely works...even with "low power explosives" like ANNM-AL will the results good enough for that job
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chief
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Plastics have a _much_ lower speed of sound, compared to glass ...
==> Something that would be expected to control some detonation would at least have to be different from air ...
==> ... glass also has a higher density ...
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grndpndr
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Youd get what youd payed for,better than a hole cut in c4 the shape of a cone, but still a very simple monroe effect SC.Noticeable but far from
effective.
Glass funnels really arent that expensive are they?or for that matter wallyword champagne glasses
A great link was sent my way for IIRC 1in brass approx 45% cones very inexpensive.Button supplys IIRC.Great for micro size slighly larger CSC's.I
havent his permission or Id share.
Maybe an oz?- 1/2 oz HE, microscale great for testing a varietyv of variables keep a person busy for some time.
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