THE IMPACT OF SHEAR RATE ON WARPAGE WITH A FOCUS ON SHEAR IMBALANCES IN NEAT AND FILLED MATERIALS

摘要

Shear induced variation effects have been shown to cause imbalances in filling patterns in both single and multi-cavity molds. These effects, however, extend beyond just the way a cavity fills and can attribute to the way a part cools and warps. Neat and filled materials vary in shrinkage and warpage properties but both are affected by shear induced melt variations developed in the runner section. Using the somewhat "opposite" shrinkage properties of a neat and fiber filled material will allow for an in depth understanding of how shear variations will affect materials with and without fillers during and after molding.