Hi,
I want to analyse an engine component that is pretensioned with two bolts and I have two problems with it.
In order to understand how the pretensioning is done I did the tutorial OS-1390.
After doing it I applied the same concept on a simplified model with one bolt only.
My goal was it to pretension the bolt first and continue with a second loadstep with pretensioned bolt. When I Iook at the result the loadcase “pretension” works fine. I can see how the bolt is pretensioned and how the structure is influenced by this behaviour. When I look at the second loadstep I can see that the calculation is not starting with the final state of the first “pretension” loadstep. Instead both loadsteps start from the initial state.
Can you tell me how does this come?
I build up the loadsteps like this:
Loadstep 1: Pretension (non-linear quasi static)
Spc -> spc
Pretension -> Pretens_1
NLPARM -> NLPARM (created Loadcollector with NLPARM Card Image)
Loadstep:2 Loadstep Force(non-linear quasi static)
Spc -> spc
NLPARM -> NLPARM (created Loadcollector with NLPARM Card Image)
Load -> load (created load/ force)
STATSUB(PRETENS) -> Pretension
CNTNLSUB -> checked and YES (tried also SCID)
Basically this is how it is done in the tutorial so I do not get why it is not working correctly. What am I doing wrong?
On top of this I want to do an optimization run where I want to minimize the compliance and to reduce the weight. Therefore I would usually set up the responses “weighted compliance” and “volfrac” with the constraint “0.9” and the objective “min”.
Is it possible to do this optimization run based on the already pretensioned state?
If yes how to do it?
Thank you.
Unable to find an attachment - read this blog
