Springback Analysis

Description

Configure springback analysis with Model Change for mold removal. Invoke when user needs mold removal, springback step, or Model Change setup.

Content

Springback occurs in the sp (springback) step, which is the 4th and final step of the curing simulation. During this step, the mold/tool is removed and the composite part is allowed to deform freely, constrained only at the Set-2 inner corner.

Model Change: Remove Contact Pair

The contact pair between the composite surface and the tool surface is removed:

*Model Change, type=CONTACT PAIR, remove
com-surface, tool-surface

Model Change: Remove Tool Elements

All tool elements are removed from the analysis using Model Change:

*Model Change, remove
_PickedSet329,

• _PickedSet329 = all tool elements (element numbers 1 to 1672)

Boundary Conditions in sp Step

The sp step uses op=NEW which replaces ALL previous boundary conditions:

• Previous tool BCs removed: Use an empty *Boundary, op=NEW to clear previous tool constraints
• New constraint applied: Set-2 is constrained with U1=U2=U3=0

*Boundary, op=NEW
Set-2, 1, 1, 0.
Set-2, 2, 2, 0.
Set-2, 3, 3, 0.

Loads in sp Step

• Pressure removed: Use *Dsload, op=NEW with no data lines to remove all distributed loads

*Dsload, op=NEW

Temperature

Temperature is maintained at 25°C during the springback step.

Result

After mold removal, the composite springs back freely and is constrained only at the Set-2 inner corner. The springback displacement (U1, U2, U3) at the last frame of the sp step represents the final part shape deviation.

Key Points

• The sp step is the final step where the part is released from the mold
• Model Change must remove both the contact pair AND the tool elements
• Using op=NEW on boundary conditions and loads ensures a clean state for springback
• The final deformation is captured in the last frame of the sp step
• This displacement data is used to evaluate part quality and springback deviation