3D Connexion Version 6.6

*STEP

NAME

Set this parameter equal to a label that willbe used to refer to the step on the output database. Step

names in the same input ﬁle must be unique. Stepname s from the original input ﬁle can be reused

in a restart input ﬁle.

NLGEOM

Omit this parameter or set NLGEOM=NO to perform a geometrically linear analysis during the

current step. Include this parameter or set NLGEOM=YES to indicate that geometric nonlinearity

should be accounted for during the step (stress analysisand fully coupled thermal-stress analysis

only). Once the NLGEOM opti on has been switched on, it will be active during all subsequent steps

in the analysis.

PERTURBATION

Include this parameter to indicate that this is a linear perturbation step. For this type of analysis

ABAQUS/Standard expects that load, boundary, and temperature changes should be given a nd that

theresults will be changes relative to the previous step. Please read the discussions in “General and

linear perturbationprocedures,” Section 6.1.2 of the ABAQUS Analysis User’sManual, “Mesh-to-

mesh solution mapping,” Section 12.4.1 of the ABAQUS Analysis User ’s Manual, and “Applying

loads: overview,” Section 27.4.1of the ABAQUS Analysis User ’sManual, before using this option.

SOLVER

Set SOLVER=DDM to use the domain decomposition iterative linear equation solver. Pleaseread

the discussion in “Iterative linear equation solver,” Section 6.1.5 of the ABAQUS Analysis Us er’s

Manual, before using this option.

If this parameter is omitted, the default direct sparse solveris used.

This parameter cannot be used in conjunction with the UNSYMM parameter or the DSA

parameter.

UNSYMM

Set UNSYMM=YES to indicate that unsymmetric matrix storage and solutionshould be used.

Set UNSYMM=NO to indicate that symmetric storage and solution should be used .

The default value for this parameter depends on the model and procedureoptions used. The

user is allowed to change thedefault value only in certain cases. Ifthe UNSYMM parameter is not

used in such cases, ABAQUS/Standard will use the value spec iﬁed in the previous general analysis

step. See “Procedures: overview,” Section 6.1.1 of the ABAQUS Analysis User’sManual, for a

more detailed discussion of the use of this parameter.

Optional data lines:

First line:

1. Subheading for this step.

The subheading can be several lines long, but only the ﬁrst 80 charactersof the ﬁrst line will be saved

and printed as a subheading.

18.36–3

ABAQUS Version 6.1 Module: ID:

Printed on: