Mechanical APDL Basic Analysis Guide - Ansys

the effect of the rigid body rotation. The coordinate system used to display these results is the specified
results coordinate system rotated by the amount of rigid body rotation.
The exceptions to this are continuum elements such as PLANE182, PLANE183, SOLID185, SOLID186, SOLID187,
SOLID272, SOLID273, and SOLID285. For these elements, the output of the element component results is
by default in the initial global coordinate system, and all component result transformations to other coordinate
systems will be relative to the initial global coordinate system.
The primary data (for example, displacements) in a large deformation analysis do not include the rigid body
rotation effect, because the nodal coordinate systems are not rotated by the amount of rigid body rotation.
7.4.2. Performing Arithmetic Operations Among Results Data
The earlier discussion of operations among path items was limited to items mapped on to a path. Using
commands from the POST1 CALC module, you can perform operations among any results data in the database.
The only requirement is that you must use the element table. The element table serves as a "worksheet"
that allows arithmetic operations among its columns.
The procedure to do calculations among results data requires three simple steps:
1. Use the ETABLE command (Main Menu> General Postproc> Element Table> Define Table) to bring
one or more result items into the element table or "worksheet."
2. Perform the desired arithmetic operations using commands from the CALC module (SADD, SMULT,
SEXP, etc.).
3. Review the outcome of the operations using PRETAB (Main Menu> General Postproc> Element
Table> List Elem Table) or PLETAB (Main Menu> General Postproc> Element Table> Plot Elem
Table).
A discussion of the element table appears earlier in this section. The ETABLE command moves specified
results data for all selected elements into the element table. One value is stored per element. For example,
if you select 10 elements and issue the command shown below, an average UX value is calculated for each
element from the nodal displacements and stored in the element table under the "ABC" column.
ETABLE,ABC,U,X
The element table will be ten rows long (because only ten elements were selected). If you now want to
double these displacements, the command would be:
SMULT,ABC2,ABC,,2
For further information, see the SMULT command description in the Command Reference.
The element table now has a second column, labeled ABC2, containing twice the values in column ABC. To
list the element table, simply choose PRETAB (Main Menu> General Postproc> Element Table> List Elem
Table).
Sample Output from PRETAB
PRINT ELEMENT TABLE ITEMS PER ELEMENT
***** POST1 ELEMENT TABLE LISTING *****
STAT CURRENT CURRENT
ELEM ABC ABC2
1 .21676 .43351
11 .27032 .54064
21 .23686 .47372
31 .47783 .95565
Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
Sample Output from PRETAB
173