What are the most common reasons that Caesar ii diverges ?

[drakkkko]

Hello Alls,

I'm modeling some FRP pipes, which fluid is Acid Weak ( 49°C ; 350 KPa), but Caesar ii Diverges.
Restrains have all the same configurations: +Y with Gap=0 (bottom positive restrain), -Y with Gap=6.0 (above negative restrain), X or Z with Gap= 6.0 mm.
I'm modeling with seismic case loads, without wind and outdoors pipes.

So ¿ What is could happening that is causing node diverge ?.

Thanks in advance.

Best Regards.

 

[ZDawg]

The most common cause of divergence I've seen is support gaps. Most of the time for me, the gap is too large to be effective. The pipe will either not touch the support at all, or will not expand enough to cause enough friction to make a difference.

 

[richay]

I'm not sure where you're located, but in this year's CAU-Express we are presenting a session on convergence issues and methods to resolve them. If you have registered for the newsletter, you should receive the announcements about these conferences.

Richard Ay
Intergraph CAS

 

[tired]

if you have any restraints which are not effective during operating case (uplift) take the friction coefficient off the support or it will cause the convergence