ABAQUS Volume II: I–Z - Manual (Page 29)

*IMPERFECTION
9.3 *IMPERFECTION: Introduce geometric imperfections for postbuckling analysis.
This option is used to introduce a geometric imperfection into a model for a postbuckling analysis.
Products: ABAQUS/Standard ABAQUS/Explicit
Type: Model data
Level: Model
References:
•
“Introducing a geometric imperfection into a model,” Section 11.3.1 of the ABAQUS Analysis User’s
Manual
•
“Unstable collapse and postbuckling analysis,” Section 6.2.4 of the ABAQUS Analysis User’s Manual
•
“Eigenvalue buckling prediction,” Section 6.2.3 of the ABAQUS Analysis User’s Manual
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,” Section 1.2.1 of the ABAQUS Analysis User’s Manual, 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.
9.3–1
ABAQUS Version 6.1 Module: ID:
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