My eigen value buckling load is zero....

My eigen value buckling load is zero... (help)

Posted in the ANSYS Forum

Anonymous

Rio De Mouro, Portugal

#1 Dec 20, 2011
Hi,

I'm a mechanical engineering student from Lisbon and I've got a problem a just can't seem to be able to solve.

I'm performing a stability analisys on an airplane fuselage in two conditions:

1) with cabin pressurization and self weight

2) just with self weight (and people and cargo and so on....)

First os off all I did a non linear buckling analisys and I found out that my structure had linear behaviour. So, I decided to make an eigen value analisys to discover the linear buckling load.

In the second case I had no problems at all. The difficulty lies when I do an eigen value analisys with cabin pressurization (I'm applying the pressure on the shell areas). When I list the results all my buckling loads are ZERO.

Does anyone know why this is hapening and can help me solve it?

Paulo

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