Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 2: Loading Main Menu> Solution> Load Step Opts> Time/Frequenc> Freq & Substeps (or Time and Substps) Main Menu> Solution> Unabridged Menu> Time/Frequenc> Freq & Substeps (or Time and Substps) NSUBST specifies the number of substeps, and DELTIM specifies the time step size. By default, the ANSYS program uses one substep per load step. 2.6.1.4. Automatic Time Stepping The AUTOTS command activates automatic time stepping. Its equivalent GUI paths are: GUI: Main Menu> Preprocessor> Loads> Load Step Opts> Time/Frequenc> Time & Time Step (or Time and Substps) Main Menu> Solution> Load Step Opts> Sol'n Control ( : <strong>Basic</strong> Tab) Main Menu> Solution> Load Step Opts> Time/Frequenc> Time & Time Step (or Time and Substps) Main Menu> Solution> Load Step Opts> Time/Frequenc> Time & Time Step (or Time and Substps) In automatic time stepping, the program calculates an optimum time step at the end of each substep, based on the response of the structure or component to the applied loads. When used in a nonlinear static (or steady-state) analysis, AUTOTS determine the size of load increments between substeps. 2.6.1.5. Stepping or Ramping Loads When specifying multiple substeps within a load step, you need to indicate whether the loads are to be ramped or stepped. The KBC command is used for this purpose: KBC,0 indicates ramped loads, and KBC,1 indicates stepped loads. The default depends on the discipline and type of analysis. Command(s): KBC GUI: Main Menu> Solution> Load Step Opts> Sol'n Control ( : Transient Tab) Main Menu> Solution> Load Step Opts> Time/Frequenc> Freq & Substeps (or Time and Substps or Time & Time Step) Main Menu> Solution> Load Step Opts> Time/Frequenc> Freq & Substeps (or Time and Substps or Time & Time Step) Some notes about stepped and ramped loads are: • If you specify stepped loads, the program handles all loads (constraints, forces, surface loads, body loads, and inertia loads) in the same manner. They are step-applied, step-changed, or step-removed, as the case may be. • If you specify ramped loads, then: 56 – All loads applied in the first load step, except film coefficients, are ramped (either from zero or from the value specified via BFUNIF or its GUI equivalent, depending on the type of load; see Table 2.13: Handling of Ramped Loads (KBC = 0) Under Different Conditions (p. 57)). Film coefficients are step-applied. Note The concept of stepped versus ramped loading does not apply to temperature-dependent film coefficients (input as -N on a convection command). These are always applied at the value dictated by their temperature function. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.
– All loads changed in later load steps are ramped from their previous values. If a film coefficient is specified using the temperature-dependent format (input as -N) for one load step and then changed to a constant value for the next step, the new constant value is step-applied. Note that in a full harmonic analysis (ANTYPE,HARM with HROPT,FULL), surface and body loads ramp as they do in the first load step and not from their previous values. – For tabular boundary conditions, loads are never ramped but rather evaluated at the current time. If a load is specified using the tabular format for one load step and then changed to a non-tabular for the next, the load is treated as a newly introduced load and ramped from zero or from BFUNIF and not from the previous tabular value. – All loads newly introduced in later load steps are ramped (either from zero or from BFUNIF, depending on the type of load; see Table 2.13: Handling of Ramped Loads (KBC = 0) Under Different Conditions (p. 57)). – All loads deleted in later load steps are step-removed, except body loads and inertia loads. Body loads are ramped to BFUNIF. Inertia loads, which you can delete only by setting them to zero, are ramped to zero. – Loads should not be deleted and respecified in the same load step. Ramping may not work the way the user intended in this case. Table 2.13 Handling of Ramped Loads (KBC = 0) Under Different Conditions Load Type DOF Constraints Temperatures Others Forces Surface Loads TBULK HCOEF Others Body Loads Temperatures Others Inertia Loads[1] Applied in Load Step 1 Ramped from TUNIF[2] Ramped from zero Ramped from zero Ramped from TUNIF[2] Stepped Ramped from zero Ramped from TUNIF[2] Ramped from BFUNIF[5] Ramped from zero Introduced in Later Load Steps Ramped from TUNIF[3] Ramped from zero Ramped from zero Ramped from TUNIF Ramped from zero[4] Ramped from zero Ramped from previous TUNIF[3] Ramped from previous BFUNIF[3] Ramped from zero 1. For OMEGA loads, OMEGA is ramped linearly; the resulting force will vary quadratically over the load step. 2. The TUNIF command specifies a uniform temperature at all nodes. Since TUNIF (or BFUNIF,TEMP) is step-applied in the first iteration, you should use BF, ALL, TEMP, Value to ramp on a uniform temperature load. 3. In this case, the TUNIF or BFUNIF value from the previous load step is used, not the current value. 4. Temperature-dependent film coefficients are always applied at the value dictated by their temperature function, regardless of the KBC setting. 5. The BFUNIF command is a generic form of TUNIF, meant to specify a uniform body load at all nodes. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. 2.6.1. Setting General Options 57
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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
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 and 46: Note If the node rotation angles th
Page 47 and 48: Figure 2.7 Scaling Temperature Cons
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: 2.6. Specifying Load Step Options A
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
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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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prnsol finish 5.9.2. VT Accelerator
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5.12. Stopping Solution After Matri
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Chapter 6: An Overview of Postproce
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each element. Derived data are also
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Chapter 7: The General Postprocesso
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Although not required for postproce
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The ETABLE command documentation li
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• Path plots • Reaction force d
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The PLETAB command contours data st
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PLDISP,1 ! Deformed shape superimpo
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7.2.1.6. Particle Flow and Charged
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• Particle flow traces occasional
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The surfaces you create fall into t
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You can opt to archive all defined
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19 41.811 51.777 .00000E+00 -66.760
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Sample PRETAB and SSUM Output *****
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7.2.5. Mapping Results onto a Path
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Command(s): PDEF GUI: Main Menu> Ge
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To retrieve path information from a
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7.2.6. Estimating Solution Error On
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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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