The following options are available:
- Uncorrected residual stress
This option will be selected when there is no shrinkage data available for the material. In this case, the Fill+Pack analysis predicts the residual stress values within in the part, based on the flow and thermal history during the molding cycle.
- Corrected residual in-mold stress (CRIMS)
This option is the default when shrinkage testing has been performed on the material. This model is the most accurate because it is obtained by correlating actual tested shrinkage values with Fill+Pack analysis predictions.
- Residual strain
This option is selected for those materials where the CRIMS model was found to not adequately describe the shrinkage behavior of the material.
Topics in this section
- Residual strain shrinkage prediction method
The residual strain shrinkage prediction method is the older of the two shrinkage prediction methods employed by Autodesk Simulation Moldflow in its Warp analysis product.
- Residual stress shrinkage prediction method
The residual stress shrinkage prediction model has been formulated assuming linear thermo-viscoelastic material behavior. It accounts for the stress developed while the material cools under pressure in the mold. In this method, rather than calculate shrinkage strain we directly calculate a residual stress distribution for each element.
- Shrinkage prediction method for 3D models
For injection molded parts, the part is constrained in the mold. During the solidification of an injection molded part, shrinkage of the solidified layer is prevented by two mechanisms. Once the part is ejected from the mold, these residual stresses will be released in the form of shrinkage deformation