Math question
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Math question - 08-31-2018, 10:39 AM

I have a carbon fiber tube that has 1 mm thick wall. If i build a carbon fiber tube that has 1.5 mm walls how much stronger is the 1.5 than the 1? Is it 1.5 times as strong or because the tube has 2 walls is it 3 times as strong.
  
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08-31-2018, 11:33 AM

That seems to be more a physics or materials engineering question.

I could tell you the answer if you tell me the appropriate equations.


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08-31-2018, 11:34 AM

It will change as the diameter of the tube changes -
.040 wall size properties will be dif over dia -
Do a search for carbon tube material properties -
type of resin and fiber weave makes a diff too -



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08-31-2018, 11:35 AM

This says 1.5 :

https://diy.stackexchange.com/questi...-of-steel-tube

I think it matters if the OD stays the same or if the ID stays the same (when increasing wall thickness). A larger OD will have greater strength.

Here is another site that shows some relative numbers in a easy to grasp fashion

http://www.fourwheeler.com/how-to/11...h-of-the-tube/

I know it's steel, but the relative values should be the same for other materials like carbon fibre.

Beyond that the math is quite complex, and it really is a strength of materials question. We may have some folks more qualified (I am not qualified) to answer this question exactly.

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08-31-2018, 11:40 AM

Deflection, buckle, burst?


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08-31-2018, 11:47 AM

Too many factors...cant go by thickness of walls only. Plus, there are many types of cf.

http://www.textreme.com/what-we-do/y...-optimization/
  
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08-31-2018, 11:54 AM

Is this round tubing, or rectangular (square)?




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Round tube
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Round tube - 08-31-2018, 12:10 PM

How about I take one of each made with all same materials except wall thickness. Put one in a vise attached to a screw pull with a weight scale, apply pressure until the thinnest breaks, then delete with other one then I would have a break difference in lbs.
  
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08-31-2018, 12:29 PM

Quote:
Originally Posted by desi2960 View Post
How about I take one of each made with all same materials except wall thickness. Put one in a vise attached to a screw pull with a weight scale, apply pressure until the thinnest breaks, then delete with other one then I would have a break difference in lbs.
An experiment? Great idea.


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08-31-2018, 12:33 PM

In general, it will be 50% stronger, but it actually is the percentage change in area and if the change is made on the ID or the OD. Changing the OD will always be stronger, over the change being made on the ID. Like if you have 12mm od tube and make it to a 9mm id wall, it will be a 43% area change. If you have a 10mm id tube, and then go to a 13mm od tube, it will be a 56% area change. As the diameter gets bigger like around 25mm, it gets closer to the 50%, but becomes like 48% with and id change and 52% with an OD change.
With composites, material layers, material type, direction of the material, all effect the strength of the material.
So it all depends on the final use, and what type of strength you are looking for. If it requires a share load,(like a wing spare tube) it will have a different layup geometry compared to a longitudinal load, (like in a pool cue for example).


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08-31-2018, 12:55 PM

Here is a chart for steel-aluminum-titanium that may help.

Good luck.
Attached Images
 




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08-31-2018, 01:27 PM

Quote:
Originally Posted by WGDave View Post
Here is a chart for steel-aluminum-titanium that may help.

Good luck.
That's weight per foot , not structural strength -
Still a Nice little chart-




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Strength question
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Strength question - 08-31-2018, 04:52 PM

Calculate the elastic section modulus x either yield strength or ultimate strength.

https://en.wikipedia.org/wiki/Section_modulus

To avoid failure, a safety factor less than 1.0 is usually used.

However if use calculate the larger diameter section modulus and divide by the smaller section modulus this will give you the strength increase. This would be based on both ends of the rod fixed and a force applied perpendicular to the middle longitudinal axis.



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08-31-2018, 05:02 PM

I saw a bank that said '24 Hour Banking,' but I don't have that much time.


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08-31-2018, 05:07 PM

Quote:
Originally Posted by Sofla View Post
That seems to be more a physics or materials engineering question.

I could tell you the answer if you tell me the appropriate equations.


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