Laminate entities define the list of stacked plies which make up a laminated
structure.
Laminate Types and Options
Additional options include control of symmetry so that only half of the plies need to
be created (all solvers) and analysis methodology which manipulates how the ABD
matrix is calculated (OptiStruct only).
There are three types of laminates:
 Ply Laminates
 Used to model parts which do not have T junctions. Typical examples are
flat or curved panels.
 Sublaminates
 Used to model portions of a part with complex geometry like T junctions.
Examples are the caps and webs of an Ibeam.
 Interface Laminates
 Used to join the sublaminates of a part with complex geometry.
The items in the following table comprise laminate data.
Option 
Description 
Name 
Name of the laminate. 
Card Image 
STACK if user profile is OptiStruct. /STACK if user profile is Radioss. None for other solvers. 
Type 
Controls laminate symmetry. Additionally, manipulates
laminate ABD calculations (OptiStruct only).
 Total
 All plies must be specified, and all stiffness terms
are developed.
 Membrane
 All plies must be specified, but only membrane terms
are developed.
 Bending
 All plies must be specified, but only bending terms
are developed.
 Smear
 Effects of stacking sequence are removed by setting
B = 0 and D = [A]*(T^2)/12.
 Smear Core
 The last ply in the stack specifies the core. Plies
above specify the face sheet. Stiffness of the core
is ignored. Stiffness of the face sheet is
calculated using the Smear calculations described
above. Half the thickness of the face sheet is
placed above the core and half is placed on the
bottom to produce a symmetric laminate.
 Symmetric
 Only plies on the bottom half of the composite
layup need to be specified. These plies are
automatically symmetrically reflected to the top
half of the composite and given consecutive numbers
from bottom to top.
 Symmetric Membrane
 Only plies on the bottom half of the stack need to
be specified. Only membrane terms for the full
laminate are developed.
 Symmetric Bending
 Only plies on the bottom half of the stack need to
be specified. Only bending terms for the full
laminate are developed.
 Symmetric Smear
 Only plies on the bottom half of the stack need to
be specified. Stiffness is then calculated using the
Smear calculations described above.

NRPT 
Number of repeats for plies in laminate. 