For information about the MISO option, see Multilinear Isotropic Hardening.
8.5. Running a Nonlinear Analysis
The program uses an automatic solution-control method that, based on the physics of your problem,
sets various nonlinear analysis controls to the appropriate values. If you are not satisfied with the results
obtained with these values, you can manually override the settings. The following commands are set
to optimal defaults:
ARCLEN EQSLV NROPT
AUTOTS KBC NSUBST
CDWRITE LNSRCH OPNCONTROL
CNVTOL LSWRITE PRED
CUTCONTROL MONITOR TINTP
DELTIM NEQITThese commands and the settings they control are discussed in later sections. You can also refer to the
individual command descriptions in the Command Reference.
If you choose to override the program-specified settings, or if you wish to use an input list from a pre-
vious release, issue SOLCONTROL,OFF in the /SOLU phase. See the SOLCONTROL command description
for more details.
Automatic solution control is active for the following analyses:
- Single-field nonlinear or transient structural and solid mechanics analysis where the solution DOFs
are combinations of UX, UY, UZ, ROTX, ROTY, and ROTZ. - Single-field nonlinear or transient thermal analysis where the solution DOF is TEMP.
The Solution Controls dialog box cannot be used to set solution controls for a thermal analysis. Instead,
use the standard set of solution commands and the standard corresponding menu paths.
8.6. Performing a Nonlinear Static Analysis
The procedure for performing a nonlinear static analysis consists of these tasks:
8.6.1. Build the Model
8.6.2. Set Solution Controls
8.6.3. Set Additional Solution Options
8.6.4. Apply the Loads
8.6.5. Solve the Analysis
8.6.6. Review the Results
8.6.7. Terminating a Running Job; Restarting8.6.1. Build the Model
This step is essentially the same for both linear and nonlinear analyses, although a nonlinear analysis
might include special elements or nonlinear material properties. See Using Nonlinear (Changing-Status)
Elements (p. 257), and Modeling Material Nonlinearities (p. 201), for more details. If your analysis includes
large-strain effects, your stress-strain data must be expressed in terms of true stress and true (or logar-
ithmic) strain. For more information about building models, see the Modeling and Meshing Guide.
Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential informationNonlinear Structural Analysis