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STEP
NAME
Set this param eter equal to a label that will be used to refer to the step on the output database. Step
names in the same input file must be unique. Step names 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 analysis and fully coupled therm al-stress analysis
only). Once the NLGEOM option has been switched on, it w ill be active during all subsequent steps
in the analysis.
PERTURBATION
Include this parameter to indicate that this is a lin ear perturbation step. For this type of analysis
ABAQUS/Standard expects that load, boundary, and temperature changes should be given and that
the results will be changes relative to the previous step. Please read the discussions in “General and
linear perturbation procedures,” Section 6.1.2 of the ABAQUS Analysis User’s Manual, “Mesh-to-
mesh solution mapping,” Section 12.4 .1 of the ABAQUS Analysi s User’s Manual, and “Applying
loads: overview,” Section 27.4.1 of the ABAQUS Analysis User’s Manual, before using this option.
SOLVER
Set SOLVER=DDM to use the domain decomposition iterative linear equation solver. Please read
the discussion in “Iterative linear equation solver,” Section 6.1.5 of the ABAQUS Analysis User’s
Manual, before using this option.
If this param eter is omitted, the default direct sparse solver is used.
This parameter cannot be used in conjunction with the UNSYMM param eter or the DSA
parameter.
UNSYMM
Set UNSYMM=YES to indicate that unsym m etric matrix storage and solution should 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 procedure options used. The
user is allowed to change the default value only in certain cases. If the UN SYMM parameter is not
used in such cases, ABAQUS/Sta ndard will use the value specifi ed in t he previous genera l analysis
step. See “Procedures: overview,” Section 6.1.1 of the ABAQUS Analysis User’s Manual, 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 characters of the first line will be saved
and printed as a subheading.
18.36–3
ABAQUS Version 6.1 Module:
ID:
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