*IMPERFECTION
9.3 *IMPERFECTION: Introduce geometric imperfections forpostbuckling analysis.
This option is used to introduce a geometric imperf ection 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 11.3.1of the ABAQUS Analysis User ’s
Manual
•“Unstable collapse and postbucklinganalysis,” 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 (mutuallyexclusive-if neither parameter is specified, ABAQUS assumes
that the imperfection data will be entered directlyon the data lines):
FILE
Set this parameter equal tothe nam e of theresults file from a previous ABAQUS/Standard analysis
containing either the mode shapes from a *BUCKLE or *FREQUENCY analysis or the nodal
displacements from a *STATICanalysis.
INPUT
Set this parameter equal to the name of the alternateinput 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 thesyntax of such file
names.
Required parameter if the FILE parameter is used:
STEP
Set this parameter equal tothe step number (in the analysis whose results file is being used as input
to this option) from which the modal or displacement data are tobe read.
Optional parameters if the FILE parameter is used:
INC
Set this parameter equal to the increment number (in the analysis whose resultsfile is being used as
input to this option) from which the displacementdata are to be read. If this parameter is omitted,
ABAQUS will read the data from the last increment available for the specified step onthe results
file.
9.3–1
ABAQUS Version 6.1 Module: ID:
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