Stack Direction Stacking direction of plies in a laminate. The stacking direction of plies in a laminate is determined by element normals for both ply-based and zone-based models. Element normals can be set from the Material Reference Orientation dialog available from the Composite Browser. Refer to Material Reference Orientation for further details. Figure 1. Figure 2. The following images show the laminate stacking direction for a given element normal. Figure 3.
