Products
Abaqus/Standard
Abaqus/Explicit
Abaqus/CAE
Type
Model data
LevelModel
Abaqus/CAE
Interaction module
Optional parameters (mutually exclusive—if neither parameter is specified, Abaqus assumes that the imperfection data will be entered directly on the data lines)
-
FILE
-
Set this parameter equal to the name of the results (.fil) file
or an output database (.odb or .sim) file
from a previous Abaqus/Standard analysis containing either the mode shapes from a BUCKLE or FREQUENCY analysis or the nodal
displacements from a STATIC analysis. The file
extension is optional. However, if both a results file and output database file exist,
the results file is used. If there is no results file but both the
.odb and .sim files exist, the
.odb file is used.
-
INPUT
-
Set this parameter equal to the name of the alternate input file containing the
imperfection data, in general, as the node number and imperfection values in the
global coordinate system. See Input Syntax Rules for the
syntax of such file names.
Required parameter if the FILE
parameter is used
-
STEP
-
Set this parameter equal to the step number (in the analysis whose file is being used
as input to this option) from which the modal or displacement data are to be read.
Optional parameters if the FILE
parameter is used
-
INC
-
Set this parameter equal to the increment number (in the analysis whose file is being
used as input to this option) from which the displacement data are to be read. If this
parameter is omitted, Abaqus will read the data from the last increment available for the specified step in the
results or output database file.
-
NSET
-
Set this parameter equal to the node set to which the geometric imperfection values
are to be applied. If this parameter is omitted, the imperfection will be applied to
all nodes in the model.
Optional parameter if the FILE
parameter is omitted
-
SYSTEM
-
Set
SYSTEM=R
(default) to specify the imperfection as perturbation values of Cartesian coordinates.
Set
SYSTEM=C
to specify the imperfection as perturbation values of cylindrical coordinates. Set
SYSTEM=S
to specify the imperfection as perturbation values of spherical coordinates. See Figure 1.
The SYSTEM parameter is entirely
local to this option and should not be confused with the SYSTEM option. As the data lines
are read, the imperfection values specified are transformed to the global rectangular
Cartesian coordinate system. This transformation requires that the object be centered
about the origin of the global coordinate system; i.e., the SYSTEM option should be off when
specifying imperfections as perturbation values using either cylindrical or spherical
coordinates.
Data lines to define the imperfection as a linear superposition of mode shapes
from the results file
- First line
-
Mode number.
Scaling factor for this
mode.
Repeat this data line as often as necessary to define the imperfection as a
linear combination of mode shapes.
Data line to define the imperfection based on the solution of a static analysis
from the results file
- First (and only) line
-
Set to 1.
Scaling factor.
Data lines to define the imperfection if the
FILE and
INPUT parameters are
omitted
- First line
-
Node number.
Component of imperfection
in the first coordinate direction.
Component of imperfection
in the second coordinate direction.
Component of imperfection
in the third coordinate direction.
Repeat this data line as often as necessary to define the
imperfection.