Thermal-structural analysis- thermal or structural contact?

1

Hello everybody,
I have to simulate a thermal-structural analysis steady steate.
In Abaqus normally, I perform two simulation:

  1. First of all a thermal analysis where I use thermal contacts
  2. Afterwards a structural static analysis where I recall thermal. Here I switch thermal contact in classic structural contact
    As far I know in ccx , it is not possible to use this approach, but only *Uncoupled temperature-displacement.
    Can you confirm it?
    Moreover if I use this approach which contact should I use? thermal or a classic structural?
    Thank you
2

You could perform sequentially-coupled thermal-stress analysis like in Abaqus using the *TEMPERATURE, FILE=... keyword.

Regarding the two built-in thermo-mechanical procedures available in CalculiX, you can find an explanation of the differences between them here: Mechanical-Thermal analysis - sequence - #2 by Calc_em

3

So you are saying that I can use both the approach showed below and the uncoupled
1 approach like Abaqus
*STEP, INC=1000, CONVERT SDI=YES
*STATIC
0.25,1.0
**
**------------------------------------------------------------------------
*TEMPERATURE, OP=NEW, FILE=Job230.frd, BSTEP=4
2° approach) uncoupled?

4

Yes, that should work in CalculiX apart from the CONVERT SDI parameter which is only available in Abaqus.

You can do that or use the *COUPLED TEMPERATURE-DISPLACEMENT step (equivalent to Abaqus) or even *UNCOUPLED TEMPERATURE-DISPLACEMENT (not used in Abaqus) if it makes sense for you.

Just keep in mind that Abaqus has separate thermal and thermo-mechanical elements while in CalculiX you always use mechanical elements - they have temperature DOFs too in those thermal and thermo-mechanical procedures.