Mechanical APDL Basic Analysis Guide - Ansys

More documents

Recommendations

Info

Chapter 2: Loading Command(s): SBCTRAN GUI: Main Menu> Preprocessor> Loads> Define Loads> Operate> Transfer to FE> All Solid Lds Main Menu> Solution> Define Loads> Operate> Transfer to FE> All Solid Lds 2.5.5.1. Resetting Constraints By default, if you repeat a DOF constraint on the same degree of freedom, the new specification replaces the previous one. You can change this default to add (for accumulation) or ignore with the DCUM command (Main Menu> Preprocessor> Loads> Define Loads> Settings> Replace vs. Add> Constraints). For example: NSEL,... ! Selects a set of nodes D,ALL,VX,40 ! Sets VX = 40 at all selected nodes D,ALL,VX,50 ! Changes VX value to 50 (replacement) DCUM,ADD ! Subsequent D's to be added D,ALL,VX,25 ! VX = 50+25 = 75 at all selected nodes DCUM,IGNORE ! Subsequent D's to be ignored D,ALL,VX,1325 ! These VX values are ignored! DCUM ! Resets DCUM to default (replacement) See the Command Reference for discussions of the NSEL,D, and DCUM commands. Any DOF constraints you set with DCUM stay set until another DCUM is issued. To reset the default setting (replacement), simply issue DCUM without any arguments. 2.5.5.2. Scaling Constraint Values You can scale existing DOF constraint values as follows: Command(s): DSCALE GUI: Main Menu> Preprocessor> Loads> Define Loads> Operate> Scale FE Loads> Constraints Main Menu> Solution> Define Loads> Operate> Scale FE Loads> Constraints Both the DSCALE and DCUM commands work on all selected nodes and also on all selected DOF labels. By default, DOF labels that are active are those associated with the element types in the model: Command(s): DOFSEL GUI: Main Menu> Preprocessor> Loads> Define Loads> Operate> Scale FE Loads> Constraints (or Forces) Main Menu> Preprocessor> Loads> Define Loads> Settings> Replace vs. Add> Constraints (or Forces) Main Menu> Solution> Define Loads> Operate> Scale FE Loads> Constraints (or Forces) Main Menu> Solution> Define Loads> Settings> Replace vs. Add> Constraints (or Forces) For example, if you want to scale only VX values and not any other DOF label, you can use the following commands: DOFSEL,S,VX ! Selects VX label DSCALE,0.5 ! Scales VX at all selected nodes by 0.5 DOFSEL,ALL ! Reactivates all DOF labels DSCALE and DCUM also affect velocity and acceleration loads applied in a structural analysis. When scaling temperature constraints (TEMP) in a thermal analysis, you can use the TBASE field on the DSCALE command to scale the temperature offset from a base temperature (that is, to scale |TEMP-TBASE|) rather than the actual temperature values. The following figure illustrates this. 30 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
Figure 2.7 Scaling Temperature Constraints with DSCALE 2.5.5.3. Resolution of Conflicting Constraint Specifications You need to be aware of the possibility of conflicting DK, DL, and DA constraint specifications and how the ANSYS program handles them. The following conflicts can arise: • A DL specification can conflict with a DL specification on an adjacent line (shared keypoint). • A DL specification can conflict with a DK specification at either keypoint. • A DA specification can conflict with a DA specification on an adjacent area (shared lines/keypoints). • A DA specification can conflict with a DL specification on any of its lines. • A DA specification can conflict with a DK specification on any of its keypoints. The ANSYS program transfers constraints that have been applied to the solid model to the corresponding finite element model in the following sequence: 1. In ascending area number order, DOF DA constraints transfer to nodes on areas (and bounding lines and keypoints). 2. In ascending area number order, SYMM and ASYM DA constraints transfer to nodes on areas (and bounding lines and keypoints). 3. In ascending line number order, DOF DL constraints transfer to nodes on lines (and bounding keypoints). 4. In ascending line number order, SYMM and ASYM DL constraints transfer to nodes on lines (and bounding keypoints). 5. DK constraints transfer to nodes on keypoints (and on attached lines, areas, and volumes if expansion conditions are met). Accordingly, for conflicting constraints, DK commands overwrite DL commands and DL commands overwrite DA commands. For conflicting constraints, constraints specified for a higher line number or area number overwrite the constraints specified for a lower line number or area number, respectively. The constraint specification issue order does not matter. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 2.5.5.Transferring Constraints 31
Page 1 and 2: ANSYS Mechanical APDL Basic Analysi
Page 3 and 4: Table of Contents 1. Getting Starte
Page 5 and 6: 2.8.4.3. Define Material Properties
Page 7 and 8: 7.2.1.6. Particle Flow and Charged
Page 9 and 10: 10. Getting Started with Graphics .
Page 11 and 12: 13.2.4.1.Turning Load Symbols and C
Page 13 and 14: 20.8. Reviewing Contents of Binary
Page 15 and 16: List of Tables 2.1. DOF Constraints
Page 17 and 18: Chapter 1: Getting Started with ANS
Page 19 and 20: shown below define two element type
Page 21 and 22: You can choose constant, isotropic,
Page 23 and 24: You can save linear material proper
Page 25 and 26: Figure 1.4 Material Model Interface
Page 27 and 28: Figure 1.7 Data Input Dialog Box -
Page 29 and 30: The first example below is intended
Page 31 and 32: 9. Click on OK. The dialog box clos
Page 33 and 34: 1.1.4.9. Reading a Material Library
Page 35 and 36: If you are performing a static or f
Page 37 and 38: Chapter 2: Loading The primary obje
Page 39 and 40: Figure 2.2 Transient Load History C
Page 41 and 42: The arc-length method is an advance
Page 43 and 44: • Transferred solid loads will re
Page 45: Note If the node rotation angles th
Page 49 and 50: Below are examples of some of the G
Page 51 and 52: Utility Menu> List> Loads> Surface>
Page 53 and 54: Figure 2.9 Example of Surface Load
Page 55 and 56: the shell, and 270° to 360° for t
Page 57 and 58: Below are examples of some of the G
Page 59 and 60: Figure 2.15 Transfers to BFK Loads
Page 61 and 62: CASE C: At least one BFV, BFA, or B
Page 63 and 64: A handy way to specify density so t
Page 65 and 66: For more information, see Initial S
Page 67 and 68: Boundary Condition Heat Flux Film C
Page 69 and 70: This problem consists of a thermal-
Page 71 and 72: 2.6. Specifying Load Step Options A
Page 73 and 74: - All loads changed in later load s
Page 75 and 76: Main Menu> Preprocessor> Loads> Loa
Page 77 and 78: 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 and 130:
GUI: Main Menu> Solution> Current L
Page 131 and 132:
Figure 5.3 Examples of Time-Varying
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
Page 181 and 182:
NOTE: When you append data to your
Page 183 and 184:
EMF - Windows Enhanced Metafile For
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 and 190:
the effect of the rigid body rotati
Page 191 and 192:
The SADD command (Main Menu> Genera
Page 193 and 194:
To view correct mid-surface results
Page 195 and 196:
To get usable results combine the r
Page 197 and 198:
7.4.4. Mapping Results onto a Diffe
Page 199 and 200:
• EMF (Main Menu> General Postpro
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
Page 209 and 210:
1. Click on the Add Data button. Re
Page 211 and 212:
APPEND Appends data to previously s
Page 213 and 214:
!derivative of variable 2 with resp
Page 215 and 216:
The above command assumes that you
Page 217 and 218:
When plotting complex data such as
Page 219 and 220:
Sample Output from EXTREM time-hist
Page 221 and 222:
5. Select the variables to be opera
Page 223 and 224:
RESP requires two previously define
Page 225 and 226:
Chapter 9: Selecting and Components
Page 227 and 228:
Note Crossover commands for selecti
Page 229 and 230:
would put UX and UZ constraints on
Page 231 and 232:
The Command Reference describes the
Page 233 and 234:
Chapter 10: Getting Started with Gr
Page 235 and 236:
Remote Network Access Hidden Line R
Page 237 and 238:
10.4.1. Adjusting Input Focus To en
Page 239 and 240:
• If the environment variable SB_
Page 241 and 242:
10.5.5. Erasing the Current Display
Page 243 and 244:
Chapter 11: General Graphics Specif
Page 245 and 246:
11.3.1. Changing the Viewing Direct
Page 247 and 248:
11.4. Controlling Miscellaneous Tex
Page 249 and 250:
11.4.3. Controlling the Location of
Page 251 and 252:
Chapter 12: PowerGraphics Two metho
Page 253 and 254:
The subgrid approach affects both t
Page 255 and 256:
Chapter 13: Creating Geometry Displ
Page 257 and 258:
Figure 13.1 Element Plot of SOLID65
Page 259 and 260:
13.2.1.12. Vector Versus Raster Mod
Page 261 and 262:
Figure 13.2 Create Best Quality Ima
Page 263 and 264:
13.2.3.2. Choosing a Format for the
Page 265 and 266:
Chapter 14: Creating Geometric Resu
Page 267 and 268:
Figure 14.2 A Typical ANSYS Results
Page 269 and 270:
• Changing the contour interval.
Page 271 and 272:
14.5. Isosurface Techniques Isosurf
Page 273 and 274:
Chapter 15: Creating Graphs If you
Page 275 and 276:
Establishing separate Y-axis scales
Page 277 and 278:
15.2.3.5. Defining the TIME (or, Fo
Page 279 and 280:
Chapter 16: Annotation A common ste
Page 281 and 282:
16.3. 3-D Annotation 3-D text and g
Page 283 and 284:
Chapter 17: Animation Animation is
Page 285 and 286:
• ANMODE (Utility Menu> PlotCtrls
Page 287 and 288:
Figure 17.2 The Animation Controlle
Page 289 and 290:
Note If you are doing animation fro
Page 291 and 292:
Chapter 18: External Graphics Besid
Page 293 and 294:
18.1.4. Exporting Graphics in UNIX
Page 295 and 296:
Note The commands discussed in this
Page 297 and 298:
18.3.6. Editing the Neutral Graphic
Page 299 and 300:
Chapter 19: The Report Generator Th
Page 301 and 302:
2. Specify a caption for the captur
Page 303 and 304:
19.4.1.1. Creating a Custom Table I
Page 305 and 306:
Table ID 46 47 48 Description Compo
Page 307 and 308:
Button or Field DYNAMIC DATA REPORT
Page 309 and 310:
The HTML tag to begin JavaScript co
Page 311 and 312:
listingName A unique listing name a
Page 313 and 314:
Chapter 20: File Management and Fil
Page 315 and 316:
20.4. Text Versus Binary Files Depe
Page 317 and 318:
Identifier ELEM EMAT ERR ESAV FATG
Page 319 and 320:
20.4.3. File Compression Many file
Page 321 and 322:
You can also redirect graphics outp
Page 323 and 324:
Chapter 21: Memory Management and C
Page 325 and 326:
21.3.3. Changing Database Space Fro
Page 327 and 328:
Figure 21.4 Dividing Work Space ANS
Page 329 and 330:
NUM_BUFR is the number of buffers p
Page 331 and 332:
een chosen for efficient running of
Page 333 and 334:
Index Symbols 3-D graphics devices,
Page 335 and 336:
path plots, 142 POST26 graphs, 200
Page 337 and 338:
fatigue graphs, 257 files, 277 focu
Page 339 and 340:
material model interface, 8 materia
Page 341 and 342:
multiframe, 117 restarting an analy
Page 343 and 344:
WINDOW command, 227 Windows graphic
show all

Mechanical APDL Basic Analysis Guide - Ansys

Create successful ePaper yourself

Delete template?

Save as template?