Abaqus removing BC with subroutine

[dejjan2]

Hi.
In begining of my coupled temperature-displacement analysis I have all displacments of all nodes equal to 0 (fixed). Then I need to remove those BC during step, dependant on time and node, using subroutine so they can deform freely. Is this even possible? I know how to use DISP subroutine, but it can't be used to remove BC, only to prescribe new magnitudes.
Thanks!

 

[Mustaine3]

No, I think this is not possible. De-/activating BC is only possible from one step to another, not within a step.

The next best workaround, even if it isn't a good one, would be:
Create a script that creates a connector (Bushing, e.g.) between each node and a fixed location. Make the elasticity/stiffness dependent of a field variable. A high stiffness would keep the node at it's location. Reduce the stiffness of each connector as needed with a subroutine.

 

[dejjan2]

Thank you for your replay. I already tried that method but it didn't worked as I hopped. I will try some more...

 

[FEA way]

What was wrong when you used this approach ? Can you say more about your model ? What kind of structure is that and how does it work in real life ?

 

[dejjan2]

The residual stresses was just too big. I am modeling some sort of manufacturing process.