Mechanical APDL Basic Analysis Guide - Ansys

Chapter 2: Loading
By default, the ANSYS program extrapolates nodal results that you review in the postprocessor from integration
point values for all elements except those with active material nonlinearities (for instance, nonzero
plastic strains). By issuing ERESX,NO, you can turn off the extrapolation and instead copy integration point
values to the nodes, making those values available in the postprocessor. Another option, ERESX,YES, forces
extrapolation for all elements, whether or not they have active material nonlinearities.
2.6.5. Setting Biot-Savart Options
These are options used in a magnetic field analysis. The two commands in this category are as follows:
Table 2.17 Biot-Savart Commands
Command
GUI Menu Paths
Purpose
BIOT Main Menu> Preprocessor> Loads> Load Step Opts> Calculates the magnetic
Magnetics> Options Only> Biot-Savart
source field intensity due
Main Menu> Solution> Load Step Opts> Magnetics> to a selected set of cur-
Options Only> Biot-Savart
rent sources.
EMSYM Main Menu> Preprocessor> Loads> Load Step Opts>
Magnetics> Options Only> Copy Sources
Main Menu> Solution> Load Step Opts> Magnetics>
Options Only> Copy Sources
Duplicates current sources
that exhibit circular symmetry.
The Low-Frequency Electromagnetic Analysis Guide explains the use of these commands where appropriate.
2.6.6. Setting Spectrum Options
There are many commands in this category, all meant to specify response spectrum data and power spectral
density (PSD) data. You use these commands in spectrum analyses, as described in the Structural Analysis
Guide.
2.7. Creating Multiple Load Step Files
All loads and load step options put together form a load step, for which the program can calculate the
solution. If you have multiple load steps, you can store the data for each load step on a file, called the load
step file, and read it in later for solution.
The LSWRITE command writes the load step file (one file per load step, identified as Jobname.S01, Jobname.S02,
Jobname.S03, etc.). Use one of these methods:
Command(s): LSWRITE
GUI: Main Menu> Preprocessor> Loads> Load Step Opts> Write LS File
Main Menu> Solution> Load Step Opts> Write LS File
If you are using the Solution Controls dialog box to set your analysis and load step options, you define each
load step using the Basic tab. (You can use the Solution Controls dialog box for static and full transient
analyses only. For details, see Solution (p. 97).)
After all load step files are written, you can use one action command to read in the files sequentially and
obtain the solution for each load step (see Solution (p. 97)).
The sample set of commands shown below defines multiple load steps:
/SOLU ! Enter SOLUTION
0
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