The Core Shift tab of this dialog is used to specify values for core shift prediction related inputs for an injection molding analysis of a model and core (mold insert).
| Perform Core shift analysis | If this option is selected, and the study contains elements of type Core (3D), the Fill+Pack analysis will run a number of Stress analyses to predict the deflections of the core. |
| Frequency of Core shift analysis | Pressures at different locations within the cavity vary greatly during the filling and packing phases, therefore, the Core shift analysis needs to be repeated several times to account for these pressure variations. These options determine at what interval the Core shift analyses are performed during the Fill+Pack analysis: |
| Maximum volume increment between analyses | Specifies the maximum change in %cavity filled during the filling phase of the analysis before another Core shift analysis is performed. |
| Maximum time step between analyses | Specifies the maximum change in filling or packing time before another Core shift analysis is performed. |
| Insert temperature | Specifies whether the part insert and core temperatures are set to a fixed value, or calculated by the Fill+Pack analysis. |
| Perform Core shift analysis during pressure iteration | During the iterations of the pressure solution in the Fill+Pack analysis, the pressure value changes which affects the core shift prediction. This option specifies whether additional Core shift analyses should be performed during the pressure solution iteration. |
| Surface matching tolerance | Specifies the maximum allowed distance between a core element and a neighboring part surface element for them to be associated with one another. |
| Percentage frozen layer that makes node constrained | Specifies the % frozen layer through the cavity thickness at which no further core deflection is expected to occur. |
| Update mesh during Core shift analysis | When the predicted core shift is large, the resulting mesh distortion may make the Fill+Pack analysis unstable, and the analysis will stop. If this is the case, turning this option off will allow the analysis to complete, but the solution will be somewhat less accurate. |
| Calculate Core shift after filling phase | If the Calculate core shift after filling phase option is not selected, then Core shift is only calculated during the filling phase. Whatever core displacement existed at the end of the filling analysis is assumed to stay unchanged during packing. If the Calculate core shift after filling phase option is selected, then the Core shift calculations continue during packing. Turning on this option for 3D Flow can be inaccurate unless the option Perform core shift analysis during pressure iteration is set to During filling and packing or Only during packing. |
| Analyze core using | Specifies which type of tetrahedral element to use for the core elements in the stress analysis of the core. |
| Use AMG matrix solver | The AMG solver improves the speed of warp analysis by using progressively coarser mesh grids for computations. Select Yes to enable the Algebraic Multigrid (AMG) matrix solver when performing a Core shift analysis. |