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SHELL GENERAL SECTION
The following parameters are optional, mutually exclusive, and used only if the section is not
defined by its general stiffness on the data lines:
COMPOSITE
Include this parameter to indicate that the shell is com posed of layers with different linear elastic
material behavior.
MATERIAL
Set this param eter equal to the name of the single linear elastic material of which the shell is made.
USER
This parameter applies only to ABAQUS/Standard analyses. See “Using a general shell section to
define the section behavior,” Section 23.6.6 of the ABAQUS Analysis User’s Manual, for use of
this option in linear perturbation analyses.
Include this parameter to indicate that the shell section stiffness is defined in user subroutine
UGENS.
The following optional parameter can be used only in combination with the MATERIAL, the
COMPOSITE, or the USER parameter:
NODAL THICKNESS
Include this p arameter to indica te that the shell thickness should not be read from the data lines but
should be interpola ted from the thickness specified at the nodes with the
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NODAL THICKN ESS
option. For composite se ctions the total thickness is interpolatedfrom the nodes, andthe thicknesses
of the layers specified on the data lines are scaled propor tionally. This parameter is ignored for
continuum shells.
The following optional parameters can be used only in combination with the USER parameter:
IPROPERTIES
Set this param eter equal to the num ber of integer property values needed as data in user subroutine
UGENS. The default is I PROPERTIES=0.
PROPERTIES
Set this parameter equal to the number of real (floating point) property values needed as data in user
subroutine UGENS. The default is PROPERTIES=0.
UNSYMM
Includethis parameter if thesection stiffness matricesare notsy mmetric. This parameter will invoke
the unsymmetric equation solution capability.
VARIABLES
Set this parameter equal to the number of solution-dependent variables that must be stored for the
section. The default is VARIABLES=1.
18.14–3
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