Bulk Data Entry Forces OptiStruct
to run models in which Linear Buckling Analysis or Preloaded Analysis is defined, in
conjunction with nonlinear materials (MATS1, MATHE, or
MGASK) or Large Displacement Nonlinear Analysis.
Parameter 
Values 
Description 
PRESUBNL 
<YES,
NO> Default =
NO
Defaults:
If this parameter does
not exist in the deck, the default behavior is
NO.
If this parameter exists in the
deck, however, if no value
(YES/NO) is specified, the
default behavior is NO.

 YES
 Forces OptiStruct to run
models, in which Linear Buckling Analysis or Preloaded
Analysis is defined, in conjunction with nonlinear
materials (MATS1,
MATHE, or
MGASK) or
large displacement nonlinear analysis.
 NO
 Does not allow Linear Buckling Analysis or Preloaded
Analysis with nonlinear materials or large displacement
nonlinear analysis to be defined and the solution errors
out if such models are run.

Note: Linear Buckling Analysis or Preloaded Analysis is not recommended in
models with nonlinear materials or large displacement nonlinear analysis. It is your
responsibility to interpret such results with caution.