Mechanical APDL Basic Analysis Guide - Ansys

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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: 174 The SABS command (Main Menu> General Postproc> Element Table> Abs Value Option) causes absolute values to be used in subsequent element table operations. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
The SADD command (Main Menu> General Postproc> Element Table> Add Items) adds two specified columns in the element table. The SALLOW command (Main Menu> General Postproc> Safety Factor> factor type) defines allowable stresses for safety factor calculations. The SEXP command (Main Menu> General Postproc> Element Table> Exponentiate) exponentiates and multiplies two columns in the element table. The SFACT command (Main Menu> General Postproc> Safety Factor> Restore NodeStrs orMain Menu> General Postproc> Safety Factor> SF for Node Strs) defines which safety factor calculations will be performed during subsequent display, select, or sort operations. The SFCALC command (Main Menu> General Postproc> Safety Factor> SF for ElemTable) calculates safety factors (for ETABLE items). The SMAX command (Main Menu> General Postproc> Element Table> Find Maximum) compares and stores the maximum of two columns. The SMIN command (Main Menu> General Postproc> Element Table> Find Minimum) compares and stores the minimum of two columns. The SMULT command (Main Menu> General Postproc> Element Table> Multiply) multiplies two specified columns in the element table. The SSUM command (Main Menu> General Postproc> Element Table> Sum of Each Item) calculates and prints the sum of each element table column. The TALLOW command (Main Menu> General Postproc> Safety Factor> Allowable Strs> Reset Temps or Main Menu> General Postproc> Safety Factor> Allowable Strs> Temp-depend) defines the temperature table for safety factor calculations. The VCROSS command (Main Menu> General Postproc> Element Table> Cross Product) calculates the cross product of two vectors stored in the element table. The VDOT command (Main Menu> General Postproc> Element Table> Dot Product) calculates the dot product of two vectors stored in the element table. 7.4.3. Creating and Combining Load Cases In a typical postprocessing session, you read one set of data (load step 1 data, for instance) into the database and process it. Each time you store a new set of data, POST1 clears the results portion of the database and then brings in the new results data. If you want to perform operations between two entire sets of results data (such as comparing and storing the maximum of two sets), you need to create load cases. A load case is a set of results data that has been assigned an arbitrary reference number. For instance, you can define the set of results at load step 2, substep 5 as load case number 1, the set of results at time = 9.32 as load case number 2, and so on. You can define up to 99 load cases, but you can store only one load case in the database at a time. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 7.4.3. Creating and Combining Load Cases 175
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ANSYS Mechanical APDL Basic Analysi
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Table of Contents 1. Getting Starte
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2.8.4.3. Define Material Properties
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7.2.1.6. Particle Flow and Charged
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10. Getting Started with Graphics .
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13.2.4.1.Turning Load Symbols and C
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20.8. Reviewing Contents of Binary
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List of Tables 2.1. DOF Constraints
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Chapter 1: Getting Started with ANS
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shown below define two element type
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You can choose constant, isotropic,
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You can save linear material proper
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Figure 1.4 Material Model Interface
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Figure 1.7 Data Input Dialog Box -
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The first example below is intended
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9. Click on OK. The dialog box clos
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1.1.4.9. Reading a Material Library
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If you are performing a static or f
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Chapter 2: Loading The primary obje
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Figure 2.2 Transient Load History C
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The arc-length method is an advance
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• Transferred solid loads will re
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Note If the node rotation angles th
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Figure 2.7 Scaling Temperature Cons
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Below are examples of some of the G
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Utility Menu> List> Loads> Surface>
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Figure 2.9 Example of Surface Load
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the shell, and 270° to 360° for t
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Below are examples of some of the G
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Figure 2.15 Transfers to BFK Loads
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CASE C: At least one BFV, BFA, or B
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A handy way to specify density so t
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For more information, see Initial S
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Boundary Condition Heat Flux Film C
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This problem consists of a thermal-
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2.6. Specifying Load Step Options A
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- All loads changed in later load s
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Main Menu> Preprocessor> Loads> Loa
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Command GUI Menu Paths Main Menu> S
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! Load Step 1: D, ... ! Loads SF, .
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Modeling> Create> Elements> Auto Nu
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Figure 2.22 Pretension Section Samp
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cylind,0.35,1, 0.75,1, 0,180 wpstyl
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11. Select Utility Menu> PlotCtrls>
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24. Select Utility Menu> Plot> Comp
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Chapter 3: Using the Function Tool
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Hint: A common error is a divide-by
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3.3. Using the Function Loader When
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2. Define the convection boundary c
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7. Optional: Enter comments for thi
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3.6.1. Graphing a Function From the
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Chapter 4: Initial State The term i
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inis,defi,,,1,,100,200,150 inis,def
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applies an equal stress of SX = 100
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4.7.2. Example: Initial Stress Prob
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inis,defi,all,all,all,all,0.1,,, in
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Chapter 5: Solution In the solution
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Solver Typical Applications * In to
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used. Running the distributed spars
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With all iterative solvers, be part
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5.3.3. Disk Space (I/O) and Postpro
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If your analysis is either static o
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Note Whether you make changes to on
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Figure 5.2 PGR File Options From th
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GUI: Main Menu> Solution> Current L
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Figure 5.3 Examples of Time-Varying
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Requirements for Performing an Anal
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*dim,temtbl,table,4,1,,time ! Defin
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5.9.1.1.1. Multiframe Restart Limit
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Page 141 and 142: 5.12. Stopping Solution After Matri
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Page 145 and 146: each element. Derived data are also
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Page 149 and 150: Although not required for postproce
Page 151 and 152: The ETABLE command documentation li
Page 153 and 154: • Path plots • Reaction force d
Page 155 and 156: The PLETAB command contours data st
Page 157 and 158: PLDISP,1 ! Deformed shape superimpo
Page 159 and 160: 7.2.1.6. Particle Flow and Charged
Page 161 and 162: • Particle flow traces occasional
Page 163 and 164: The surfaces you create fall into t
Page 165 and 166: You can opt to archive all defined
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Page 169 and 170: Sample PRETAB and SSUM Output *****
Page 171 and 172: 7.2.5. Mapping Results onto a Path
Page 173 and 174: Command(s): PDEF GUI: Main Menu> Ge
Page 175 and 176: To retrieve path information from a
Page 177 and 178: 7.2.6. Estimating Solution Error On
Page 179 and 180: Write Results - You can use the dat
Page 181 and 182: NOTE: When you append data to your
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Page 185 and 186: Figure 7.20 The PGR File Options Di
Page 187 and 188: 7.4.8. Comparing Nodal Solutions Fr
Page 189: the effect of the rigid body rotati
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Page 201 and 202: 7.4.8.1. Matching the Nodes The Mec
Page 203 and 204: 7.4.8. Comparing Nodal Solutions Fr
Page 205 and 206: Chapter 8: The Time-History Postpro
Page 207 and 208: enables the alternate selections sh
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Page 211 and 212: APPEND Appends data to previously s
Page 213 and 214: !derivative of variable 2 with resp
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Page 227 and 228: Note Crossover commands for selecti
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Page 231 and 232: The Command Reference describes the
Page 233 and 234: Chapter 10: Getting Started with Gr
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Page 237 and 238: 10.4.1. Adjusting Input Focus To en
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10.5.5. Erasing the Current Display
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Chapter 11: General Graphics Specif
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11.3.1. Changing the Viewing Direct
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11.4. Controlling Miscellaneous Tex
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11.4.3. Controlling the Location of
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Chapter 12: PowerGraphics Two metho
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The subgrid approach affects both t
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Chapter 13: Creating Geometry Displ
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Figure 13.1 Element Plot of SOLID65
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13.2.1.12. Vector Versus Raster Mod
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Figure 13.2 Create Best Quality Ima
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13.2.3.2. Choosing a Format for the
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Chapter 14: Creating Geometric Resu
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Figure 14.2 A Typical ANSYS Results
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• Changing the contour interval.
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14.5. Isosurface Techniques Isosurf
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Chapter 15: Creating Graphs If you
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Establishing separate Y-axis scales
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15.2.3.5. Defining the TIME (or, Fo
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Chapter 16: Annotation A common ste
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16.3. 3-D Annotation 3-D text and g
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Chapter 17: Animation Animation is
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• ANMODE (Utility Menu> PlotCtrls
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Figure 17.2 The Animation Controlle
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Note If you are doing animation fro
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Chapter 18: External Graphics Besid
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18.1.4. Exporting Graphics in UNIX
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Note The commands discussed in this
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18.3.6. Editing the Neutral Graphic
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Chapter 19: The Report Generator Th
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2. Specify a caption for the captur
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19.4.1.1. Creating a Custom Table I
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Table ID 46 47 48 Description Compo
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Button or Field DYNAMIC DATA REPORT
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The HTML tag to begin JavaScript co
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listingName A unique listing name a
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Chapter 20: File Management and Fil
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20.4. Text Versus Binary Files Depe
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Identifier ELEM EMAT ERR ESAV FATG
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20.4.3. File Compression Many file
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You can also redirect graphics outp
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Chapter 21: Memory Management and C
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21.3.3. Changing Database Space Fro
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Figure 21.4 Dividing Work Space ANS
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NUM_BUFR is the number of buffers p
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een chosen for efficient running of
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Index Symbols 3-D graphics devices,
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path plots, 142 POST26 graphs, 200
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fatigue graphs, 257 files, 277 focu
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material model interface, 8 materia
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multiframe, 117 restarting an analy
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WINDOW command, 227 Windows graphic
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