Do these linear vs nonlinear buckling plots make sense?
Do these linear vs nonlinear buckling plots make sense?
(OP)
I am doing linear buckling analyses (where everything is linear), and nonlinear buckling analyses where you have nonlinear geometry enabled and nonlinear material behavior (hyperelastic material). Everything is done in COMSOL. The structure is fixed on one side, and a forced displacement of -0.01m in the x-direction on the opposite side. It seems the linear model buckles earlier compared to the nonlinear? What could be the reason for this, and does it look okay otherwise?
The blue lines are the nonlinear plots, and red/yellow dotted line endpoint is the buckling strain and stress - I have just made it into a line for easier visualization.


The blue lines are the nonlinear plots, and red/yellow dotted line endpoint is the buckling strain and stress - I have just made it into a line for easier visualization.



RE: Do these linear vs nonlinear buckling plots make sense?
RE: Do these linear vs nonlinear buckling plots make sense?
Because I know buckling analyses require some sort of perturbation to see which way the model will buckle, do we get this perturbation when we apply displacement to this model?
RE: Do these linear vs nonlinear buckling plots make sense?
RE: Do these linear vs nonlinear buckling plots make sense?
RE: Do these linear vs nonlinear buckling plots make sense?
RE: Do these linear vs nonlinear buckling plots make sense?
when you "fix" a side, are you rigidly constraining all the nodes on that face ? this would not be right, if you don't allow for poisson effects.
stress vs strain is a material property ... well, it is for a complete block; and I'd've thought that it would trend for your "fill factor".
another day in paradise, or is paradise one day closer ?