3D Connexion Version 6.6

*SHELL GENERAL SECTION

The following parametersare 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 composed of layers with differentlinear elastic

material behavior.

MATERIAL

Set this parameter equal tothe 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,” Section23.6.6 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 stiffnessis deﬁned in user subroutine

UGENS.

The following optional parameter can be used onlyin combination with the MATERIAL, the

COMPOSITE, or the USER parameter:

NODAL THICKNESS

Include this parameter to indicate that the shell thickness should not be re ad from the data lines but

should be interpolated from the thickness speciﬁed at the node s with the *NODAL THICKNESS

option. For composite se ctions the total thickness is interpolated from the nodes, and the thi cknesses

of the layers speciﬁed on the data lines are scaled proportionall y. This parameter is ignored for

continuum shells.

The following optionalparameters can be used only in combination with the USER parameter:

IPROPERTIES

Set this parameter equal to the number of integerproperty values needed as data in user subroutine

UGENS. The default is I PROPERTIES=0.

PROPERTIES

Set thisparam eterequal 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 the section stiffness matrices are not symmetric. Thisparameterwill invoke

the unsymmetric equation solution capability.

VARIABLES

Set this parameter equal to the number of solution-dependentvariables that must be stored for the

section. The default is VARIABLES=1.

18.14–3

ABAQUS Version 6.1 Module: ID:

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