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Strength of a tube. Question
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Posted by: 1911freak

03/14/2005, 15:50:30

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Need some help fast.
I need the formulas to calculate the strength of a tube using the O.D. and wall thickness. I need to differentiate between materials.
Example: An aluminum tube (say 6061 T6) has a .750" O.D. and a .125" wall thickness. If I switched to Titanium tube with a wall thickness of .032" what O.D. would I need to achieve the same strength? I am talking about deformation due to compression (buckling) or bending (side load?).

Also at what wall thickness to O.D. ratio should I begin to worry? 60-1?

Any thoughts on using oval tube are also welcome.

Modified by 1911freak at Mon, Mar 14, 2005, 18:44:17

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Re: Strength of a tube.
Re: Strength of a tube. -- 1911freak Post Reply Top of thread Forum
Posted by: devitg

03/27/2005, 20:43:38

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you wrote
I am talking about deformation due to compression (buckling) or bending (side load?).

Those are two so much diferent conditions .
But you shall know this formula

Yield strength = applied moment / resistent module

Moment of inertia for a circle crown , "the pipe"
Jx= pi/4 ( od^4 -id^4)
and resisten module
Wx= Jx/OD "the pipe outside radious"
So the yield shall be smaller than the material yield
It is the formula for bending ,
For buckling is far diferent , a far way from my known.

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