Slenderness of columns

[jacek0841]

I tried to find (I am not good at it) CosmosXrpress forum but could not.

- Could anybody give me link to cosmosexpress forum ?

- More important - I need a quick answer: Does the CosmosXpress considers slenderness of columns ---> buckling when columns are subject to compression load ? I guess it does but I would like to hear it from some gurus.

Thaks in advance.

 

[TheTick]

I don't think there is a forum for COSMOSXpress. There is one titled "SolidWorks: COSMOS" <

http://www.eng-tips.com/threadminder.cfm?pid=1183>

COSMOSXpress is very limited. Probably does not have buckling. I haven't seen it.

 

[jacek0841]

I remodeled the column to have it with a very thin wall - 1/8" instead of previous 1/2" hoping that this time it would almost certainly buckle up.

The program did NOT finished (I tried it twice) - this time I am getting message: Not enough boudary conditions.

My guess it - it means the vertical column simply collapsed ?

 

[djw2k3]

I doubt COSMOS Express would be failing because of the memeber failing under buckling.

I would be very very wary of using Cosmos express in this way.

There are some very simple calculations available for buckling by (amongst others) a chap named Euler.

In its simplest form for pinned ends

Pcritical=(pi^2EI)/(l^2)

Where Pcritical is the critical buckling load, E is modulus (207 GPa for steel) and I is the second moment of area of the column.

DW

 

[Heckler]

COSMOSExpress doesn't do Buckling. Why don't you just do the hand calculation. They're not hard....grab a copy of Roake's Formulas for Stress & Strain - chapter 11 Columns

Euler's Formula P/A = Cpi^2E/(L/r)^2

Depending on your specific column geometry their are several conditional set ups.

Best Regards,

Heckler
Sr. Mechanical Engineer
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