Buckling Calculation for Cast Iron link 1

[KMP04]

I recently have been performing design calculations for a small cast iron link with an applied bearing load (pins)on each end, compressing the link. 2.375 OD bushings are spaced 6" center to center at the link ends. cross section of the link 3" x 1.5" thick.

Using Eulers formula for pin ended columns, P = pi^2EI/L^2
I obtain a critical buckling force 18 times larger than the max load expected for failure due to pure compression!

What am I missing?

 

[CRG]

What am I missing?

The force compressing the link?

 

[desertfox]

Hi KMPO4

I think the link to short to consider buckling.

regards desertfox

 

[GregLocock]

That's right, look at the L/r ratio. Read your notes again to find out which r.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[PAN]

KMP04,
Please check this link.

http://www.twi.co.uk/j32k/protected/band_3/ksgs001.html

 

[KMP04]

Thankyou Everyone for your feedback.
Regards,
KMP04

 

[drawoh]

KMP04,

Can cast iron fail in buckling? Is this not ductile behaviour?

JHG

 

[KMP04]

Drawoh,
I am actually replacing the old cast iron links with steel.

Regards,

KMP.

 

[Denial]

To answer drawoh's first question, cast iron CAN fail in buckling, as can any material. It might need to be a structural element of a geometry one does not usually associate with cast iron, but the possibility still exists.

 

[EddyC]

Your link is not a "slender member" (It is thick compared to its length). It therefore has a buckling load higher than its compression yield load. In other words, it will fail in compression before it ever buckles.