ANSYS Basic Analysis Procedures Guide.pdf

ANSYS Basic Analysis

Guide

ANSYS Release 9.0

002114

November 2004

ANSYS, Inc. is a

UL registered

ISO 9001: 2000

Company.

ANSYS Basic Analysis Guide

ANSYS Release 9.0

ANSYS, Inc.

Southpointe

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Canonsburg, PA 15317

ansysinfo@ansys.com

http://www.ansys.com

(T) 724-746-3304

(F) 724-514-9494

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Table of Contents

1. Getting Started with ANSYS ................................................................................................................ 1–1

1.1. Performing a Typical ANSYS Analysis ............................................................................................. 1–1

1.2. Building a Model ........................................................................................................................... 1–1

1.2.1. Specifying a Jobname and Analysis Title ............................................................................... 1–1

1.2.1.1. Defining the Jobname ................................................................................................. 1–1

1.2.1.2. Defining an Analysis Title ............................................................................................. 1–2

1.2.1.3. Defining Units ............................................................................................................. 1–2

1.2.2. Defining Element Types ....................................................................................................... 1–2

1.2.3. Defining Element Real Constants .......................................................................................... 1–3

1.2.3.1. Creating Cross Sections ............................................................................................... 1–4

1.2.4. Defining Material Properties ................................................................................................. 1–4

1.2.4.1. Linear Material Properties ............................................................................................ 1–4

1.2.4.2. Nonlinear Material Properties ...................................................................................... 1–7

1.2.4.3. Anisotropic Elastic Material Properties ......................................................................... 1–8

1.2.4.4. Material Model Interface .............................................................................................. 1–8

1.2.4.4.1. Accessing the Interface ....................................................................................... 1–8

1.2.4.4.2. Choosing Material Behavior ................................................................................ 1–9

1.2.4.4.3. Entering Material Data ...................................................................................... 1–10

1.2.4.4.4. Logging/Editing Material Data .......................................................................... 1–14

1.2.4.4.5. Example: Defining a Single Material Model ........................................................ 1–14

1.2.4.4.6. Example: Editing Data in a Material Model ......................................................... 1–15

1.2.4.4.7. Example: Defining a Material Model Combination .............................................. 1–16

1.2.4.4.8. Material Model Interface - Miscellaneous Items .................................................. 1–17

1.2.4.5. Using Material Library Files ........................................................................................ 1–17

1.2.4.6. Format of Material Library Files .................................................................................. 1–18

1.2.4.7. Specifying a Default Read/Write Path for Material Library Files .................................... 1–18

1.2.4.8. Creating (Writing) a Material Library File ..................................................................... 1–18

1.2.4.9. Reading a Material Library File ................................................................................... 1–19

1.2.5. Creating the Model Geometry ............................................................................................ 1–19

1.2.6. Apply Loads and Obtain the Solution .................................................................................. 1–20

1.2.6.1. Defining the Analysis Type and Analysis Options ........................................................ 1–20

1.2.6.2. Applying Loads ......................................................................................................... 1–21

1.2.6.3. Specifying Load Step Options .................................................................................... 1–22

1.2.6.4. Initiating the Solution ................................................................................................ 1–22

1.2.7. Review the Results ............................................................................................................. 1–22

2. Loading ................................................................................................................................................ 2–1

2.1. Loading Overview ......................................................................................................................... 2–1

2.2. What Are Loads? ........................................................................................................................... 2–1

2.3. Load Steps, Substeps, and Equilibrium Iterations ........................................................................... 2–2

2.4. The Role of Time in Tracking ......................................................................................................... 2–3

2.5. Stepped Versus Ramped Loads ..................................................................................................... 2–4

2.6. How to Apply Loads ...................................................................................................................... 2–5

2.6.1. Solid-Model Loads: Advantages and Disadvantages .............................................................. 2–5

2.6.2. Finite-Element Loads: Advantages and Disadvantages .......................................................... 2–6

2.6.3. DOF Constraints ................................................................................................................... 2–6

2.6.4. Applying Symmetry or Antisymmetry Boundary Conditions .................................................. 2–7

2.6.5. Transferring Constraints ....................................................................................................... 2–8

2.6.5.1. Resetting Constraints .................................................................................................. 2–9

2.6.5.2. Scaling Constraint Values ............................................................................................. 2–9

2.6.5.3. Resolution of Conflicting Constraint Specifications ..................................................... 2–10

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