Riks analysis
Riks analysis
(OP)
Hi,
I'm doing some buckling analysis of a simply supported plate. I've ran linear buckling analysis to find the eigenvalues and used the lowes eigenvalue in a Riks analysis to seed an imperfection. But I expirience some wierd things. If I seed my imperfection to 1, the analysis complete and I can easely find the results. But if I seed the imperfection to 5, the analysis will not complete. The same happends if I run Riks analysis whitout seeding any imperfection. Do anybody know what could cause this?
Regards
Senad
I'm doing some buckling analysis of a simply supported plate. I've ran linear buckling analysis to find the eigenvalues and used the lowes eigenvalue in a Riks analysis to seed an imperfection. But I expirience some wierd things. If I seed my imperfection to 1, the analysis complete and I can easely find the results. But if I seed the imperfection to 5, the analysis will not complete. The same happends if I run Riks analysis whitout seeding any imperfection. Do anybody know what could cause this?
Regards
Senad





RE: Riks analysis
Do you try to take a step before analysis of buckling with a load of 90% of the first eigenvalue analysis of buckling not preloaded ?
Remember to active the nlgeom parameter to on.
After this, you can use this new values for imperfection.
The result is more precise and less parameter sensitive.
I hope I have been clear.
Bye
Minoand
RE: Riks analysis
Regards
Senad
RE: Riks analysis
The buckling analysis is a linear pertubation analysis, so if you evalute a preload structure the results could be different.
Bye
minoand