Hello,

How to create/copy body from deformed shape from linear buckling/frequency analysis?

Hello,

How to create/copy body from deformed shape from linear buckling/frequency analysis?

Hi, Q. Tran,

The deformations seen in Buckling and Frequency are not true displacements. They are qualitative plots showing the mode of buckling failure or the mode of vibration at a certain frequency. So, the deformations you see don't have true physical meaning but are more of a theory of behavior.

Thank you very much Ryan,

So to create an imperfection structure for local nonlinear buckling analysis, how we can do?. Any reference source would be very appreciated.

Hi Q.,

I looked in our content library and there were walk throughs of a nonlinear buckling setup. Sorry about that.

Hi Ryan,

Actually, with Solidworks we can run a nonlinear buckling analysis via arc length control method (see snap-through Solidworks example). However with local imperfection modelling, there are many ways to create. To my knowledge, we can distort the structure (very slightly in favor of model shape) or apply a dummy load to induce the model shape. But at the referenced "Pressure Vessel Design: The Direct Route"- Elsevier Science publication, the authors defined:

*"To obtain the required initial imperfections of the inner dished end of the model geometry, a classical (eigenvalue) buckling calculation of the perfect structure with linear-elastic constitutive law has been performed. The so obtained buckling shapes of the first buckling modes are***superposed and the superposition scaled**, with regard to the maximum permissible irregularity in profile according to EN 13445-4, 5.4.4, and the result is then used for the determination of the initial imperfect geometry."They used Ansys APDL to run nonlinear buckling with imperfection model directly imported from linear buckling. This book makes me some confusing and that why I would like to check with Solidwork simulation.

Many thanks again and have a great day

Hi, Q. Tran,

The deformations seen in Buckling and Frequency are not true displacements. They are qualitative plots showing the mode of buckling failure or the mode of vibration at a certain frequency. So, the deformations you see don't have true physical meaning but are more of a theory of behavior.