FEA issue with workbench plus question on equation with conical shells

[R.enR]

Hi everybody,

I am designing conical shells in the aim to better understand the launch vehicle adapter and what changing thickness of conical shells will do to buckling load and natural frequency.

I have an issue with certain equations I have characteristic equations with a critical axial compression for truncated conical shells and buckling moment for a truncated cone along with several other equations. I have all the values except the "semi vertex angle of cone" what exactly is that as in where is that located in a truncated cone?

My main concern right now is with workbench and it is a new program that I am reall struggling to come to terms with. I have a symmetric model with a simple thin shelled design and it is merely me adding a load till the critical buckling load is identified. There bottom is fixed so there is no freedom of movement, I know this is very simple to model but for the life of me I can't seem to be able to go from static structural analysis to linear buckling analysis for the same model. I have duplicated the model and altered the analysis type it doesn't work I have attempted to start fresh with a linear buckling analysis but I cannot seem to find the buckling point of this model. It has "command" and initial environment as the different things I can input below the mesh section. If anyone has an idea of how to model could they tell me step by step because I must be an alien or mentally slow with this program right now but it is the bane of my existence currently
Any help would be really appreciated

Thank you

 

[Unrest]

Since you already have a static non-linear model that shows the buckling, you wouldn't gain anything except speed by stepping back to the simpler linear buckling.

For static, you can get it to increase the load automatically, but I can't quite remember how :P Never done linear buckling in ANSYS tho sorry.

Yea don't worry that it's hard, people pay thousands for training courses on that, and still just skim the surface :P Just be grateful that you have Workbench, not Classic.

semi vertex angle would be the angle between the centerline and wall. i.e. half the angle at the (truncated away) vertex of the cone.