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carbon pipes

  • Thread starter Thread starter AngeloB
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AngeloB

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Hello, everyone.
Are there carbon tubes to be purchased by meter?
I switch off better, I need external diam tubes from 200 mm to 450 mm thick 5-10 mm. must be quite precise, we say as an extruded aluminium tube, and have at least the outer surface "carbon look".
it is not necessary that they have the mechanical characteristics of the real carbon.

Thank you for your help.
 
But you just need the look or you need carbon fiber?
because if they have to only look like carbon, there are companies that do this type of painting.
 
from what I understand our competitors use fiberglass tubes with external carbon leather.
we are carpenters and we have used, until today, stainless steel pipes.
the problem is that small thickness stainless steel tubes are very imprecise and it is difficult to use them to build a series of telescopic tubes. carbon tubes are very precise both internally and externally and with a thick finish (they explained to me that they wrap the fiber on a spindle) I would like to choose from a pictosto catalog that make me do everything to measure.
 
I don't know carbon and fiberglass processing techniques
Suppose we take an external diameter tube 450 mm and often 10-15 mm pvc
or other plastic material of easy availability.
We assume that being the pipe in question an industrial product is well "calibrated", that is actually round and smooth.
instead of building a steel spindle op. light alloy, wrap the carbon fiber around the so-called tube and then put everything in autoclave at 150 degrees
the pvc tube melts and remains a carbon tube of internal diam. 450 mm, exactly as it serves me. and possible?
or I don't put the tube in autoclave, I'm satisfied with the performance that I get and keep my soul in pvc. and possible?
 
It's very likely that a pig comes out!

you have to consider whether your tube must be pre-impregnated or wet laminate.
with the preimpregnated you have to cure it at 80° minimum. Your pipe is distorted and the party is over.
If you do it wet, you can take a first cure at 40° and then posture it at 60°. in such case the artifact assumes characteristics that can be adapted to your needs.
remains the fact that by rolling in wet over a pvc tube you hardly get a product from the perfect finish and geometry. You must then put it on and paint.
At this point it depends on what you need!

wave
 
leave aside the mechanical characteristics.
if I work at low temperature or I find an industrial tube that holds 80-100°, once I demolish the industrial tube the carbon tube remains internally smooth as the outside of the industrial tube. the external face will be equal to the one that would be obtained with a metal spindle.
On the other hand when they make a fiberglass hull, the vacuum bag comes into contact with the resin but then it is removed, I think, easily. the hull sometimes is baked in autoclave sometimes not.
Sure that with the autoclave I get better predictions, but at mè do not need, I need a big tube, carbon look, precise inside and out.
from how hò understood is not a problem to build carbon tubes calibrated inside and out up to 250-280 mm in diameter. after it becomes difficult to find a large enough godmother and an appropriate extractor.
 
In theory, yes, but how much do you think the pvc tube is calibrated? If you go to measure it carefully you realize it's neither straight nor perfectly cylindrical.
Then you want it perfect inside and out! sailboats are stunned (usually on both sides!). However, to have a pipe that is perfect inside and out you need to do it in pre-impregnated, on a perfect aluminum spindle. it is necessary to treat it in autoclave and with the thermorestring around.
If you don't follow these directions, the inside comes as a mold and the outside is not in carbon look.
then, you can want, stucco it and lay a "exthetical" layer externally, to give it that much sought after aspect. You have to assess if it's okay.
From my point of view, if you need a nice tube inside and out, make it wrapping. If you just need it nice inside, do it yourself. but don't believe it's so easy!
 
You've destroyed all my fantasies, I'll make it wrapping.
wrapping is processing with chuck and autoclave?
Hello and thank you
 
That's right. I assure you that wrapping products have a very good internal and external finish.

You don't have to put your hands back!

wave
 
AngeloB said:
leave aside the mechanical characteristics.
if I work at low temperature or I find an industrial tube that holds 80-100°, once I demolish the industrial tube the carbon tube remains internally smooth as the outside of the industrial tube. the external face will be equal to the one that would be obtained with a metal spindle.
On the other hand when they make a fiberglass hull, the vacuum bag comes into contact with the resin but then it is removed, I think, easily. the hull sometimes is baked in autoclave sometimes not.
Sure that with the autoclave I get better predictions, but at mè do not need, I need a big tube, carbon look, precise inside and out.
from how hò understood is not a problem to build carbon tubes calibrated inside and out up to 250-280 mm in diameter. after it becomes difficult to find a large enough godmother and an appropriate extractor.
Click to expand...
by curiosity. What are the hulls being treated in autoclaves?
 
I don't know... I don't think boeing is cracked. that I know, the planes are autoclave, so in a controlled atmosphere. boats are sometimes made with the vacuum bag, and therefore not in controlled atmosphere. This method only allows you to control infusion levels.
this in theory. in practice there are yards, of which I avoid to make the names, that roll hulls in August, under the sun. catalyzing reactions lead the hull to exceed fifty degrees which, moreover, the resin dries so fast, that the Romanian turn must give us in brush... we are far enough from the autoclave no?

I only tell you that this 23-foot cabin, now sails happily in the Italian seas. . .
 
For all I know, motorboats have never been made.
Instead vacuum is made so many, both infusion or scrimp that both in pre-impregnated, and this is the practice for many yards.
about 787, it's mostly carbon, and it's autoclave. I can't tell you how and in what autoclaves, but it is.
Among other things for good part, I believe near 25%, is built in Italy.

wave
 
I'm with what you say. except for superyacht, or in any case limited-wheeling boats, where cut & spout and lamination in handle make it a mistress.. .
 
Hello everyone,
I have read with interest these posts and having to design some structures with carbon tubes I wanted to ask you if aside laminator (which I think only analyzes the foil) some of you have to recommend a software to design or study the behavior of a carbon tube. I also found it in this company
www.italtubes.itthank you in advance to those who will answer me. . .

greetings
Mar
 
Hello, Marco.

what kind of structures are we talking about? because if it's stuff done so much to the kilo, the sticks of the maid on exel are good, while if you need something more sophisticated you will need a finite element program that supports the shell modeling and the adequate breakage hamsters and especially the ability to set the problem and analyze the results.

I know I've been vague and apologized, but your question is a little vague and that I know there are no such specific commercial codes.

I am still available for further clarification.
 

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