1) Does buckling analysis only use euler's buckling formula?
2) Do you always need to use soft springs in the buckling module?
Hi Phil, my answers to your questions below
1) Does buckling analysis only use euler's buckling formula? as I understand it, if you are running a buckling study in Simulation Professional, it assumes Linear (Euler) buckling. If you have Simulation Premium, and run a Non-Linear study, then you can take into account Non-linear buckling.
2) Do you always need to use soft springs in the buckling module? No, you don't need to always use soft springs. In fact (I may be wrong), I believe SolidWorks reccommends using fixtures wherever possible to restrain models.
I hope that helps. Please let me know if you require more information.
Thank you for the reply.
1) That seems very limited. I currently have Sim Pro. I'm dissappointed.
2) OK, I put an immovable restraint at the bottom of my column. I then used reference geometry to restrain the top of the column in the transverse directions. Put my load on the top of the column downward in the axial direction. The solver falied. When I added soft springs, it solved.
In FEA, there are two ways to perform a buckling analysis: linear and non-linear.
Can you post a screen shot of your model (or the model itself)?
Attached is my model.
This column is so simple that I just calculated it by hand, but I thought it would be a good exercise to do an FEA buckling analysis on it.
This column is well below the critical slenderness ratio, but Simulation outputs load factors consistent with slender column expressions.
Immovable on a solid element?
I was using beam elements.
there are 3 types of bucking:
1) Linear - eigenvalue extraction - is based onthe undeformed shape (no load applied, though it may have one inthe analysis to allow a clac of hte load factor) of the structure.
2) Non-linear (so called) - you run a static cases of hte load onthe structure and use the resulting deformed stiffness matrix to extract the eigen value (vector). So the load factor is based onthe deformed shape.
3) Post buckling - youloaqd the structure till it collapses and then you can see at which load it lost its stiffness - no eigen value procedure. This procedure can be quite accurate in my experince - well as accurate as you material properties and the fidelity of your boundary conditions allow. I have done calcs where this is in the order of 1% of test data.
Can you describe the 2nd and 3rd procedures in a little more detail? Do you have to have Sim Premium to do them?
to the extent that it is does it the first two are supported in Sim pro the last one is sim premium. In sim pro it is all automatic for hte load types supported for the "NL" procedure (item 2 above). The reseller course training material explores it. Contact is not supported in any of the procedures.
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