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btruebood, thanks for your suggstions, ya, i understand the your beam example. If suppose i have closed vessel. Is there any chance to vessel come into geometrical nonlinearity? my question is to what are the other parameters to components get in to the geometrical nonlinearity except radious...

you are come up with Multilinear Isotropic Rate independent properties, so u can specify tensioin loading (postitive polarity)instead of compression.

what is the different between the Bonded contact and CERIG in ansys? Can any body share the through of above one.

I heard 3 reasons to use Geometrical nonlinear behaviour. 1)FE elements completely distoretd then will use Geometrical nonlinear behaviour. 2)If plastic strain is 6-10% 3)In metal forming process. Can any body discuss with topic?

because of normalization

Generally mode shape scaling done for modal analysis.why?

thanks RON and cockroach for Ur valuable answers. But i have done experiment by changing the element size, i got much change in stress, negligible change in displacement. but over thumb rule is stress is directly proportional to strain with E linear. can u clarify this two and concluded to one.

why normalization has been doing in modal analysis? Ex. 1 mode displacements showing like 250(more than actual value) units. Thanks, madduri.surya

If refining the element size, are displacements change or not? if not, what about the stress gradinet?