Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 5: Solution SOLVE ! Solution for load step 2 Etc. 5.7.2. Using the Load Step File Method The load step file is a convenient method to use when you want to solve problems while you are away from your terminal or PC (for example, overnight). It involves writing each load step to a load step file (via the LSWRITE command or its GUI equivalent) and, with one command, reading in each file and obtaining the solution. See Loading (p. 21) for details about creating load step files. To solve multiple load steps, issue the LSSOLVE command (Main Menu> Solution> From LS Files). LSSOLVE is actually a macro that reads in the load step files sequentially and initiates the solution for each load step. A sample command input for the load step file method is shown below: /SOLU ! Enter SOLUTION ... ! Load Step 1: D,... ! Loads SF,... ... NSUBST,... ! Load step options KBC,... OUTRES,... OUTPR,... ... LSWRITE ! Writes load step file: Jobname.S01 ! Load Step 2: D,... ! Loads SF,... ... NSUBST,... ! Load step options KBC,... OUTRES,... OUTPR,... ... LSWRITE ! Writes load step file: Jobname.S02 ... 0 LSSOLVE,1,2 ! Initiates solution for load step files 1 and 2 See the Command Reference for a discussion of the NSUBST, KBC, OUTRES, OUTPR, LSWRITE, and LSSOLVE commands. 5.7.3. Using the Array Parameter Method This method, mainly intended for transient or nonlinear static (steady-state) analyses, requires knowledge of array parameters and do-loops, which are part of APDL (ANSYS Parametric Design Language). See the ANSYS Parametric Design Language Guide for information about APDL. The array parameter method involves building tables of load versus time using array parameters and is best explained by the following example. 114 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Figure 5.3 Examples of Time-Varying Loads Suppose that you have a set of time-varying loads such as the ones shown above. There are three load functions, so you need to define three array parameters. All three array parameters must be of type TABLE. The force function has five points, so it needs a 5 x 1 array; the pressure function needs a 6 x 1 array; and the temperature function needs a 2 x 1 array. Notice that all three arrays are one-dimensional. The load values are entered in column 1 and the time values are entered in column zero. (The zeroth column and zeroth row, which normally contain index numbers, must be changed and filled with a monotonically increasing set of numbers if you define the array parameter as a TABLE.) To define the three array parameters, you first need to declare their type and dimensions. To do so, use either of the following: Command(s): *DIM GUI: Utility Menu> Parameters> Array Parameters> Define/Edit For example: *DIM,FORCE,TABLE,5,1 *DIM,PRESSURE,TABLE,6,1 *DIM,TEMP,TABLE,2,1 You can now use either the array parameter editor (Utility Menu> Parameters> Array Parameters> Define/Edit) or a set of "=" commands to fill these arrays. The latter method is shown below. FORCE(1,1)=100,2000,2000,800,100 ! Force values in column 1 FORCE(1,0)=0,21.5,50.9,98.7,112 ! Corresponding time values in column 0 FORCE(0,1)=1 ! Zeroth row PRESSURE(1,1)=1000,1000,500,500,1000,1000 PRESSURE(1,0)=0,35,35.8,74.4,76,112 PRESSURE(0,1)=1 TEMP(1,1)=800,75 TEMP(1,0)=0,112 TEMP(0,1)=1 You have now defined the load histories. To apply these loads and obtain the solution, you need to construct a do-loop (using the commands *DO and *ENDDO) such as the one shown below: TM_START=1E-6 ! Starting time (must be > 0) TM_END=112 ! Ending time of the transient Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 5.7.3. Using the Array Parameter Method 115
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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
Page 79 and 80: ! 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: GUI: Main Menu> Solution> Current L
Page 133 and 134: Requirements for Performing an Anal
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
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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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