Context: If you use a coordinate system to define the ply's orientation, Abaqus/CAE cannot determine the orientation within an element without knowing the spatial orientation of the element. Therefore, Abaqus/CAE displays an asterisk (*) in place of the ply fibers to signify that it cannot draw lines in the 1–2 plane that represent the fiber direction. For the same reason, Abaqus/CAE cannot draw lines that accurately represent the fiber direction if the ply's orientation is defined using a discrete field distribution; a caret (^) in place of the ply fibers indicates that the additional rotation in a ply's orientation is defined using a discrete field. In solid composite layups the fibers in a ply do not always run parallel to the 1–2 plane (e.g., if the 3-direction of the ply orientation and the element stacking direction are not aligned). Since fibers in a ply stack plot are always drawn in the 1–2 plane, they are not a true depiction of the fibers in the solid composite. Instead the fibers are a graphical representation of the rotation angles in the composite section or layup definition: the angle drawn in the ply stack plot is the rotation angle specified in the ply table measured about the element stacking direction axis. |