ANSYS Structural Buckling Analysis 

Glad you liked it!

Glad you liked it!

​​@@endeavosThank you very much for this clear explanation! Could you be so kind as to share the link with models' geometry or the final ansys file ?

In some cases two buckling loads can happen successively as the buckling load is increased. Is that what you mean?

Thanks for watching. The ~200+ KN is the estimated capacity based on DNV's chart. it is marked right there on Fig B-17.

@@endeavosThe ~210 kN is not the 'allowable limit' based on the non-linear buckling. The 210 kN is the unfactored capacity from the previous example which was based on LBA and empirical buckling curves. The design capacity from NLA is the max value on the chart divided by all relevant safety factors (load and resistance) based on whatever code you are working to.

The linear buckling load is normalized to unit deformation. So I can use scale factor = deformation.

Hi Benjamin. The scale factor is based on the manufacturing tolerance and as structural designer, it is basically your choice. If you want to be conservative, you can use the max tolerance. In this video, I followed the DNV's recommendation. Please see the document DNV-RP-C208. Thanks!

@@endeavos Thanks for the information! Can I also know which section did you get the value from? And another question I would like to ask is: In my project, I need to apply both hydrostatic and constant pressure onto a corrugated wall. When I get my eigenvalue, do I multiply the eigenvalue to both pressure or just the constant pressure? Thanks in advance!

Temperature can impact young's modulus if you have defined it as function of temperature. Buckling can happen at any temperature. There is no set "buckling temperature". If you want to find how buckling load varies with increasing temperature, you may have to run this simulation at different temperatures by inserting temperature as a load. You can use the temperature as a parameter and run this simulation at different temperatures to determine buckling load as a function of temperature.

@@endeavos i assumed temperature is constant, only temperature varies across the thickness.

I didn't get your question. Can you elaborate it?

@@endeavos sorry, i get it now, i want to change my question, what is the different between force based and displacement based analysis, and why both of analysis we get the similar result? Another question, why i cannot get the graph like you did? I m getting straight line. 😣

@@nuraisyahsamsul2831 In the force based analysis, we apply a force to initiate buckling which results in displacement whereas in the displacement based analysis, we apply displacement to initiate buckling. Both methods will give you the same buckling load, however, force based methods run into convergence problems. Displacement based loading is preferred because it will also show you post buckled behavior of the structure.

@@nuraisyahsamsul2831 Regarding the second question, can you tell me what example or problem you are referring to?

Sure, its zaeem@endeavos.com