Science Discussion: Compression Strength Of 1 Inch Aluminum TubingGroup: sci.engr.mech Discussion: Compression Strength Of 1 Inch Aluminum Tubing Add this discussion to your Favorites Posts: 4
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Jack 
Fri, 16 Oct 2009 13:29:39 0700 (PDT) 
How can I calculate the compression load factor for a 1 inch aluminum
tube, 049065 wall thickness

Dlzc 
Oct 16, 2009  05:02:01 pm EST 
Dear Jack:
On Oct 16, 1:29=A0pm, Jack wrote:
> How can I =A0calculate the compression load factor
> for a 1 inch aluminum tube, 049065 wall thickness
You will need to evaluate the failure mode. Long shapes fail by
"Euler buckling". Short shapes fail in the expected crushing mode.
http://www.efunda.com/formulae/solid_mechanics/columns/columns.cfm
http://en.wikipedia.org/wiki/Buckling
David A. Smith

Brian Whatcott 
Oct 19, 2009  05:53:30 am EST 
Jack wrote:
> How can I calculate the compression load factor for a 1 inch aluminum
> tube, 049065 wall thickness
For metals the load to yield is much the same in compression or in
tension. You find the area of the crosssection and multiply with the
yield strength. But a column in compression doesn't usually fail this
way. It fails in buckling. The criterion here is slenderness ratio.
If its no more than 20 times as long as its diameter, it won't fail in
buckling (usually) and conditionally, columns (or struts, same
difference) can hold up at slenderness ratios up to 80:1.
The key is No Side Loads At All. All Loads Through The Long Axis.
Brian W

Fred Osim 
Oct 21, 2009  11:39:56 pm EST 
the load on the tube has a lot to do with their end conditions, whether it
is simply connected or moment connected, and how it is loaded. for just
compression, stress equals force over area. for buckling,
Pcr=pi^2EI/(KL)^2. if K=1, both ends are pinned, if both ends are rigidly
clamped, K=.5. if one end is clamped and the other end is pinned, K=.7. if
the columned is cantilever and loaded at free end, K=2.
reference: statics and mechanics of materials by nash, schaum's outline.
from fred.
but wrote in message
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> How can I calculate the compression load factor for a 1 inch aluminum
> tube, 049065 wall thickness

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