Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 5: Solution TM_INCR=1.5 ! Time increment *DO,TM,TM_START,TM_END,TM_INCR ! Do for TM from TM_START to TM_END in ! steps of TM_INCR TIME,TM ! Time value F,272,FY,FORCE(TM) ! Time-varying force (at node 272, FY) NSEL,... ! Select nodes on pressure surface SF,ALL,PRES,PRESSURE(TM) ! Time-varying pressure NSEL,ALL ! Activate all nodes NSEL,... ! Select nodes for temperature specification BF,ALL,TEMP,TEMP(TM) ! Time-varying temperature NSEL,ALL ! Activate all nodes SOLVE ! Initiate solution calculations *ENDDO See the Command Reference for discussions of the *DO, TIME, F, NSEL, SF, BF, and *ENDDO commands. You can change the time increment (TM_INCR parameter) very easily with this method. With other methods, changing the time increment for such complex load histories would be quite cumbersome. 5.8. Terminating a Running Job You can terminate a running ANSYS job, if necessary, with the help of system functions such as a system break, issuing a kill signal, or deleting the entry in the batch queue. For nonlinear analyses, however, this is not the preferred method, because a job terminated in this manner cannot be restarted. To terminate a nonlinear analysis "cleanly" on a multitasking operating system, create an abort file, named Jobname.ABT (or, on some case-sensitive systems, jobname.abt), containing the word nonlinear on the first line, starting in column 1. At the start of an equilibrium iteration, if the ANSYS program finds such a file in the working directory, the analysis will be stopped and can be restarted at a later time. Note If commands are being read using a file specified via the /INPUT command (Main Menu> Preprocessor> Material Props> Material Library, or Utility Menu> File> Read Input from), the abort file will terminate the solution, but the program will continue to read commands from the specified input file. Thus, any postprocessing commands included in the input file will execute. 5.9. Restarting an <strong>Analysis</strong> Occasionally, you may need to restart an analysis after the initial run has been completed. For example, you may want to add more load steps to the analysis. These may be additional loading conditions in a linear static analysis or additional portions of a time-history loading curve in a transient analysis. Or, you may need to recover from a convergence failure in a nonlinear analysis. ANSYS allows a multiframe restart for structural static, structural transient (full or mode-superposition methods), and thermal analyses. Distributed ANSYS supports multiframe restarts for nonlinear and full transient analyses. You can also re-run a VT Accelerator analysis using information available from a previous run. The multiframe restart can resume a job at any point in the analysis for which information is saved, allowing you to perform multiple analyses of a model and gives you more options for recovering from an abnormal termination. Rerunning an analysis completed with VT Accelerator can reduce the number of iterations needed to obtain the solution for all load steps and substeps. Rerunning a VT Accelerator analysis is described in VT Accelerator Re-run (p. 123). 116 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Requirements for Performing an <strong>Analysis</strong> Restart The model must meet the following conditions to restart an analysis: • The analysis type must be either static (steady-state), harmonic (2-D magnetic only), thermal, thermalstructural, or transient (full and mode superposition methods only). No other analysis can be restarted. • At least one iteration must have been completed in the initial run. • The initial run should not have stopped due to a "killed" job, system break, or system crash. • You performed your initial analysis and generated the restart file under the same ANSYS version number. 5.9.1. Multiframe Restart If you are performing a nonlinear static or full transient structural analysis, or a static or transient thermal or thermal-structural analysis, ANSYS by default sets up the parameters for a multiframe restart. Multiframe restart allows you to save analysis information at many substeps during a run, then restart the run at one of those substeps. Before running your initial analysis, you should use the RESCONTROL command to set up the frequency at which restart files are saved within each load step of the run. When you need to restart a job, use the ANTYPE command to specify the restart point and type of restart. You can continue the job from the restart point (making any corrections necessary), or you can terminate a load step at the restart point (rescaling all of the loading) then continue with the next load step. The sample input listing below shows how to set up the restart file parameters in an analysis then restart the analysis, continuing from a specified load step and substep. ! Restart run: /prep7 et,1,42,,, !Define nodes and elements mp,ex,1,10 mp,alpx,1,0.1 mp,alpy,1,0.1 mp,alpx,1,0.1 mp,nuxy,1,0.2 n,1 n,2,1 n,3,1,1 n,4,,1 n,5,2 n,6,2,1 e,1,2,3,4 e,2,5,6,3 finish /solu rescontrol,,all,1,5 !For all load steps, write the restart !file .Rnnn at every substep, but allow !a maximum of 5 restart files per load step nlgeom,on !Large strain analysis with temperature loadings nsubst,6,6,6 d,1,all d,2,uy outres,all,all solve bfe,1,temp,1,1 bfe,2,temp,1,5 solve rescontrol,file_summary !List information contained in all the !.Rnnn files for this job finish /post1 set,last presol finish Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 5.9.1. Multiframe Restart 117
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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, .
Page 81 and 82: Modeling> Create> Elements> Auto Nu
Page 83 and 84: Figure 2.22 Pretension Section Samp
Page 85 and 86: cylind,0.35,1, 0.75,1, 0,180 wpstyl
Page 87 and 88: 11. Select Utility Menu> PlotCtrls>
Page 89 and 90: 24. Select Utility Menu> Plot> Comp
Page 91 and 92: Chapter 3: Using the Function Tool
Page 93 and 94: Hint: A common error is a divide-by
Page 95 and 96: 3.3. Using the Function Loader When
Page 97 and 98: 2. Define the convection boundary c
Page 99 and 100: 7. Optional: Enter comments for thi
Page 101 and 102: 3.6.1. Graphing a Function From the
Page 103 and 104: Chapter 4: Initial State The term i
Page 105 and 106: inis,defi,,,1,,100,200,150 inis,def
Page 107 and 108: applies an equal stress of SX = 100
Page 109 and 110: 4.7.2. Example: Initial Stress Prob
Page 111 and 112: inis,defi,all,all,all,all,0.1,,, in
Page 113 and 114: Chapter 5: Solution In the solution
Page 115 and 116: Solver Typical Applications * In to
Page 117 and 118: used. Running the distributed spars
Page 119 and 120: With all iterative solvers, be part
Page 121 and 122: 5.3.3. Disk Space (I/O) and Postpro
Page 123 and 124: If your analysis is either static o
Page 125 and 126: Note Whether you make changes to on
Page 127 and 128: Figure 5.2 PGR File Options From th
Page 129 and 130: GUI: Main Menu> Solution> Current L
Page 131: Figure 5.3 Examples of Time-Varying
Page 135 and 136: *dim,temtbl,table,4,1,,time ! Defin
Page 137 and 138: 5.9.1.1.1. Multiframe Restart Limit
Page 139 and 140: prnsol finish 5.9.2. VT Accelerator
Page 141 and 142: 5.12. Stopping Solution After Matri
Page 143 and 144: Chapter 6: An Overview of Postproce
Page 145 and 146: each element. Derived data are also
Page 147 and 148: Chapter 7: The General Postprocesso
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
Page 167 and 168: 19 41.811 51.777 .00000E+00 -66.760
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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EMF - Windows Enhanced Metafile For
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Figure 7.20 The PGR File Options Di
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7.4.8. Comparing Nodal Solutions Fr
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the effect of the rigid body rotati
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The SADD command (Main Menu> Genera
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To view correct mid-surface results
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To get usable results combine the r
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7.4.4. Mapping Results onto a Diffe
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• EMF (Main Menu> General Postpro
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7.4.8.1. Matching the Nodes The Mec
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7.4.8. Comparing Nodal Solutions Fr
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Chapter 8: The Time-History Postpro
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enables the alternate selections sh
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1. Click on the Add Data button. Re
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APPEND Appends data to previously s
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!derivative of variable 2 with resp
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The above command assumes that you
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When plotting complex data such as
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Sample Output from EXTREM time-hist
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5. Select the variables to be opera
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RESP requires two previously define
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Chapter 9: Selecting and Components
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Note Crossover commands for selecti
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would put UX and UZ constraints on
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The Command Reference describes the
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Chapter 10: Getting Started with Gr
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Remote Network Access Hidden Line R
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10.4.1. Adjusting Input Focus To en
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• If the environment variable SB_
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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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