Use MPCHG with caution. Changing material properties in a nonlinear analysis may produce unintended
results, particularly if you change nonlinear (TB) material properties.
8.6.3.2.5. Output Control
In addition to OUTRES, which you can set on the Solution Controls dialog box, there are several other
output control options that you can set for an analysis:
Command(s):OUTPR,ERESX
GUI: Main Menu> Solution> Unabridged Menu> Load Step Opts> Output Ctrls> Solu Printout
Main Menu> Solution> Unabridged Menu> Load Step Opts> Output Ctrls> Integration Pt
Printed output (OUTPR) includes any results data on the output file (Jobname.OUT).
Extrapolation of results (ERESX) copies an element's integration point stress and elastic strain results to
the nodes instead of extrapolating them, if nonlinear strains (plasticity, creep, swelling) are present in
the element. The integration point nonlinear strains are always copied to the nodes.
See Loading in the Basic Analysis Guide for more information about these options.
8.6.4. Apply the Loads
Apply loads on the model. See Structural Static Analysis (p. 9) in this guide and Loading in the Basic
Analysis Guide for load information. Inertia and point loads maintain constant direction, but surface
loads "follow" the structure in a large-deformation analysis. You can apply complex boundary conditions
by defining a one-dimensional table (TABLE type arra y parameter). See Applying Loads Using TABLE
Type Array Parameters (p. 17) in this guide for more information.
8.6.5. Solve the Analysis
You solve a nonlinear analysis using the same commands and procedure as you do in solving a linear
static analysis. See Solve the Analysis (p. 18) in Structural Static Analysis (p. 9). If you need to define
multiple load steps, you must respecify time settings, load step options, and so on, and then save and
solve for each of the additional load steps. Other methods for multiple load steps - the load step file
method and the arra y parameter method - are described in the Basic Analysis Guide.
8.6.6. Review the Results
Results from a nonlinear static analysis consist mainly of displacements, stresses, strains, and reaction
forces. You can review these results in POST1, the general postprocessor, or in POST26, the time-history
postprocessor.
Remember that in POST1, only one substep can be read in at a time, and that the results from that
substep should have been written to Jobname.RST. ( The load step option command OUTRES controls
which substep results are stored on Jobname.RST.) A typical POST1 postprocessing sequence is de-
scribed below.
8.6.6.1. Points to Remember
- To review results in POST1, the database must contain the same model for which the solution was calcu-
lated. - The results file (Jobname.RST) must be available.
Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationPerforming a Nonlinear Static Analysis