Shrinkage models

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