ProductsAbaqus/StandardAbaqus/Explicit
TypeModel data
LevelModel
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 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.
- 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 results
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
results 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 on
the results 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.