Boundary Condition Changes in Simulation Steps

1

Hello,

Is it possible to alter the boundary conditions between simulation steps?
For example, I have two step in first step I fix Set_TOP-Layer2 as fixed but for step 2 I want to free the Set-Top-Layer2 and want to fixed the Set-Top-Layer3. How can I achieve this?
Any guidance on this would be helpful.

*STEP, NLGEOM
*STATIC

*BOUNDARY
Set-Ground, 1
Set-Ground, 2
Set-Ground, 3
Set-Top-Layer-2,1
Set-Top-Layer-2,2
Set-Top-Layer-2,3

*TEMPERATURE
Part-2, 201

*MODEL CHANGE, TYPE=ELEMENT, ADD
Part-2

** Outputs → frd file
*NODE FILE
U
*EL FILE
S, E, PEEQ
** outputs → dat file
** reaction forces for Constraint fixed
*NODE PRINT, NSET=ConstraintFixed, TOTALS=ONLY
RF
*END STEP

*STEP, NLGEOM
*STATIC
*BOUNDARY
Set-Ground, 1
Set-Ground, 2
Set-Ground, 3
Set-Top-Layer-3,1
Set-Top-Layer-3,2
Set-Top-Layer-3,3

*TEMPERATURE
Part-3, 201

Thanks,
Bhavita

2

Just use *BOUNDARY, OP=NEW and respecify only those BCs that should stay in the second step. Of course, you can also add new ones.

3

@Calc_em Thank you, It worked as intended.