Mechanical APDL Basic Analysis Guide - Ansys

Chapter 7:The General Postprocessor (POST1)
41 .36171 .72341
51 .36693 .73387
61 .13081 .26162
71 .50835 1.0167
81 .35024 .70049
91 .25630 .51260
MINIMUM VALUES
ELEM 61 61
VALUE .13081 .26162
MAXIMUM VALUES
ELEM 71 71
VALUE .50835 1.0167
Another example of arithmetic operations is to calculate the total volume of selected elements. To do this,
you might store all element volumes in the element table, select the desired elements, and sum them using
the SSUM command:
ETABLE,VOLUME,VOLU ! Store element volumes (VOLU) as VOLUME
ESEL,... ! Select desired elements
SSUM ! Calculate and print sum of VOLUME column
See the ETABLE, ESEL, and SSUM command descriptions for further information.
Notes
• All operation commands (SADD, SMULT, SSUM, etc.) work only on the selected elements.
• ANSYS does not update element table entries automatically when a different set of results is read into
the database. An element table output listing displays headers which indicate the status of each column
relative to the current database. CURRENT indicates that the column data is from the current database,
PREVIOUS indicates that it is from a previous database, and MIXED indicates that it results from an operation
between previous and current data. (Once a column is labeled mixed, it will not change status
unless you erase or redefine it with all elements selected.) The following commands cause column
headers to change from CURRENT to PREVIOUS:
SET
LCASE
LCOPER
LCZERO
FLREAD
DESOL
Main Menu> General Postproc> selection criteria
Main Menu> General Postproc> Load Case> Read Load Case
Main Menu> General Postproc> Load Case> operation
Main Menu> General Postproc> Load Case> Zero Load Case
Main Menu> General Postproc> Read Results> FLOTRAN 2.1A
Main Menu> General Postproc> Define/Modify> Elem Results
• The ETABLE,REFL option, which refills (updates) the element table with values currently in the database,
does not affect calculated items. In the above double-the-UX example, if you read in a different set of
results and then issue ETABLE only the ABC column will be updated ("current" status). The ABC2 column
remains as is (keeps its "previous" status).
• You can use the fact that ANSYS does not update the element table automatically after a new SET
command to good advantage: for example, to compare element results between two or more load
steps, or even between two or more analyses.
• The following CALC module commands apply to calculations using the element table:
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The SABS command (Main Menu> General Postproc> Element Table> Abs Value Option) causes
absolute values to be used in subsequent element table operations.
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