Modeling the core using mold inserts

If you want the core used in a Core-shift analysis to extend past the end of the part, use the Create Inserts tool to create a mold insert.

Alternatively you can create the core using an existing model.

Or, you can import the core from a CAD program.

Note: Ensure the part uses a Dual Domain mesh. If your part uses a Midplane mesh, convert it to Dual Domain mesh before following the instructions. Make sure the mesh has no errors.

1. It is easier to use Inserts when you hide the elements of the part that are not in contact with the core.
   1. Create a new layer to hold the non-core elements.
   2. Assign all elements not touching the core to the new layer.
2. Click (Geometry tab > Create panel > Inserts) to display the Create Mold Inserts tool.
3. Select the elements on the current layer. These should be the only elements that touch the core. Select the direction in which the core is to be projected and specify the length of the core as the projection distance (enter a negative value if projecting in the negative direction of the selected axis), then click Apply.
   Tip: If you do not get the expected results, click Undo and repeat this step.
4. Hide all layers apart from the newly created Mold insert layer created by the Create Mold Inserts tool. Rename the Mold insert layer to Core elements .
5. Change the properties of the elements on the Core elements layer to Part Surface (Dual Domain).
6. Change the mesh type of the elements on the Core elements layer to 3D and remesh the core.
   Tip: Use a minimum of 4 elements through the thickness of the mesh.
7. Rename the New tetras layer to Core tetras . Rename the New Nodes layer to Core Nodes . This allows you to easily identify the core layers.
8. Set the Property Type of the elements on the Core elements layer to Core 3D.
   Tip: The name of the property assigned will be displayed in the analysis logs. If you have multiple cores, you can apply a separate Core 3D property with a different name to the elements in each of the cores.
9. You can change the material of the elements on the Core elements layer and the local mold surface temperature control by selecting the elements on the Core elements layer, then editing their properties (Geometry tab > Properties panel > Edit).
10. You must set a fixed constraint on the nodes at the fixed end of the core, where it joins to the mold. Click (Boundary Conditions tab > Constraints and Loads panel > Constraints > Fixed Constraint).
11. Select all nodes on on the Core nodes layer that are at the fixed end of the core.
    Tip: Ensure that the Select Enclosed entities option is set (Geometry tab > Selection panel > Select Enclosed entities) and that you rotate the part so the nodes you want to select are in a line. This stops unwanted nodes from being selected.
12. In the Input Parameters section of the Fixed Constraint tool, select Core-shift Analysis from the Use constraint in drop down box, then select Apply to apply the fixed constraint.
13. Display all the model layers by selecting them in the Layers pane.
14. Right-click the Mesh Type icon in the Study Tasks pane, then reselect the original mesh type, Midplane or Dual Domain of the part.

The model is now ready to be used in a Core-shift analysis.