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Shaped Charges

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Author	Topic: Shaped Charges
MR COOL Frequent Poster	posted January 11, 2000 03:57 AM Can anyone please tell me any site from where I can find about the meking of all kinds of shaped charges(For demolition purposes). ------------------
m3nth Frequent Poster	posted January 11, 2000 09:21 AM you can find a topic on the subject of shaped charges in this forum under "shattering steel" and the results of darcey's little project under "to darcey". not that it's going to help you any since you can't SEARCH FOR YOURSELF. read nbk2000's page if you want to get started and quit asking for people to post exact methods for this and that. it's all there already you just have to find it and read it instead of being lazy and asking other people to do work that you supposedly think they should do for you. ~m3nth~ Friends help you move. Real friends help you move bodies.
Blaze Frequent Poster	posted January 11, 2000 11:16 PM Learn from others mistakes, heres two failed attempts. Left Charge: target - large brass padlock effect - strait vertical cut 4 - 5mm deep running vertical full length of lock. Right Charge: target - 3/4" steel plate effect - nothing, powdered lead on plate, no trace of explosive container.
nbk2000 Moderator	posted January 12, 2000 06:38 AM The reason your left hand attempt failed (if the illustration is correct) is because you had no stand off from the target to give the jet room to form. The right hand failed because the liner has to be a coherent mass, not pellets, so the force of inversion can liquify the metal into a jet. But you were correct to include the stand off legs on that one. Read an earlier post by darcey I think where he asked about shaped charges. I posted quite a bit of info on the subject there. Along with a link to a government PDF on shaped charge design. ------------------ "The knowledge that they fear is a weapon to be used against them." www.50megs.com/nbk2000
Fjp92 Frequent Poster	posted January 12, 2000 01:10 PM Today i made my first shaped charge. NOW i dont know if the thing did wat it was supose to do. It was like the one in the diagram of topic (shattering steel) . Pice of pipe cut in half, That one.. It was very small( Pipe lengh 6cm. Diameter 2cm. Explosive was AP with NC and styrefoum. The amount, Well all the explosive ontop would have bean enouth to fill a 35mm film container. The copper pipe penatrated 2.5 cm into target Target was a dead tree ( semi hard wood) Does it sound if it work as it sould have??? Or would that amount of explosive be able to blow any thingy that deep into the wood.
nbk2000 Moderator	posted January 12, 2000 05:57 PM A properly designed shaped charge can typically penetrate 6 - 8x its width of metal. But thats with very tight tolerances of the liner and explosive design. You did pretty good for a first time. The real test is when you use it against metal. Try that next time instead of a tree. ------------------ "The knowledge that they fear is a weapon to be used against them." www.50megs.com/nbk2000
m3nth Frequent Poster	posted January 16, 2000 03:18 AM nbk are you saying that if the shaped charge is 1" across and is stood off 1.5" from the target (as shown in diagrams that have been posted elsewhere) that it should be able to penetrate 6"-8" of metal? that is a lot... does it matter how "deep" the charge is? like on the drawings posted above does it matter how high the container is that's packed with explosives? also does this container even need to try and focus the blast forward? like i was looking in that doe pdf and it had polyethylene for the container with metal bent into an inverted V. well i looked up polyethylene and it is that plastic stuff they make gas lines out of i'm pretty sure. would it be better to use metal though if you could come by it or does this just not matter at all? any ideas? ~m3nth~
nbk2000 Moderator	posted January 16, 2000 10:29 PM The reference to 6-8x was refering to an ideal shaped charge. Something military built. The home maker will probably never be able to match the effectivneness of the military, but you can always try. The military uses things like tantalum, tungsten, and uranium, with high explosives like Hexogen and PBX, materials beyond our budgets. A penetration ratio of 2-3x is plenty for any realistic use we could have. The polyethylene was used (I believe) to lighten the weight of the charge since the liner was so thin and the explosive so powerful that a thick confining casing wasn't needed. The home maker would need to use a confining case for the explosive because we use weaker explosives than the military. ------------------ "The knowledge that they fear is a weapon to be used against them." www.50megs.com/nbk2000

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