springback-analysis

# 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