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Substructures and Submodeling with Abaqus

6.12

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Course objectives Upon completion of this course you will be able to:

Understand the difference between substructuring and submodeling

Build, translate, rotate and reflect substructures

Build preloads into substructures

Design meshes for submodel analysis

Perform solid-to-solid, shell-to-shell, and shell-to-solid submodeling

Targeted audience This course is recommended for engineers with experience using Abaqus/Standard.

Prerequisites None

About this Course

2 days

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Day 1

Lecture 1: Introduction to Substructures

Lecture 2: Using Static Substructuring in Abaqus

Lecture 3: Substructuring as a Linear Perturbation about a Preloaded State

Lecture 4: Dynamic Substructuring

Lecture 5: Substructure Output

Lecture 6: Substructuring Examples

Workshop 1a: Substructures: Plane Frame Analysis

Workshop 1b: Substructures: Surface Mount Analysis

Lecture 7: Using substructures with Abaqus/Explicit

Workshop 2: Substructures: Beam Impact (optional)

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Day 2

Lecture 8: Introduction to Submodeling

Lecture 9: Submodeling in Abaqus

Lecture 10: Abaqus Usage and Examples (Part 1)

Workshop 3: Submodeling: Pressure Vessel Nozzle Analysis

Lecture 11: Abaqus Usage and Examples (Part 2)

Workshop 4: Submodeling: Ceramic-Metal Braze Joint

Lecture 12: Submodeling Practices

Lecture 13: Limitations of Submodeling

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Additional Material

Appendix 1: Theory of Substructures

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Legal Notices

The Abaqus Software described in this documentation is available only under license from Dassault

Systèmes and its subsidiary and may be used or reproduced only in accordance with the terms of such

license.

This documentation and the software described in this documentation are subject to change without

prior notice.

Dassault Systèmes and its subsidiaries shall not be responsible for the consequences of any errors or

omissions that may appear in this documentation.

No part of this documentation may be reproduced or distributed in any form without prior written

permission of Dassault Systèmes or its subsidiary.

© Dassault Systèmes, 2012.

Printed in the United States of America

Abaqus, the 3DS logo, SIMULIA and CATIA are trademarks or registered trademarks of Dassault

Systèmes or its subsidiaries in the US and/or other countries.

Other company, product, and service names may be trademarks or service marks of their respective

owners. For additional information concerning trademarks, copyrights, and licenses, see the Legal

Notices in the Abaqus 6.12 Release Notes and the notices at:

http://www.3ds.com/products/simulia/portfolio/product-os-commercial-programs.

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Revision Status

Lecture 1 5/12 Updated for 6.12

Lecture 2 5/12 Updated for 6.12

Lecture 3 5/12 Updated for 6.12

Lecture 4 5/12 Updated for 6.12

Lecture 5 5/12 Updated for 6.12

Lecture 6 5/12 Updated for 6.12

Lecture 7 5/12 Updated for 6.12

Lecture 8 5/12 Updated for 6.12

Lecture 9 5/12 Updated for 6.12

Lecture 10 5/12 Updated for 6.12

Lecture 11 5/12 Updated for 6.12

Lecture 12 5/12 Updated for 6.12

Lecture 13 5/12 Updated for 6.12

Appendix 1 5/12 Updated for 6.12

Workshop 1a 5/12 Updated for 6.12

Workshop 1b 5/12 Updated for 6.12

Workshop 2 5/12 Updated for 6.12

Workshop 3 5/12 Updated for 6.12

Workshop 4 5/12 Updated for 6.12

L1.1

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The following topics are covered in this lesson.

Lesson content:

Introduction to Substructures

Lesson 1: Introduction to Substructures

30 minutes

L1.2

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Here are the steps to be followed:

Introduction to Substructures

1. Why Substructuring?

2. Static Substructuring

3. Advantages of Substructuring

4. Procedures Supporting Substructures

L2.1

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The following topics are covered in this lesson.

Lesson content:

Using Static Substructuring in Abaqus

Lesson 2: Using Static Substructuring in Abaqus

1 hour

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Here are the steps to be followed:

Using Static Substructuring in Abaqus

1. The Basics

2. Substructure Generation

3. Substructure Usage: Abaqus/CAE

4. Substructure Usage: Keywords

5. Substructure Load Cases

6. Substructure Gravity Loading

7. Kinematic Constraints in

Substructures

8. Limitations

L3.1

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The following topics are covered in this lesson.

Lesson content:

Substructuring as a Linear Perturbation about a Preloaded State

Lesson 3: Substructuring as a Linear Perturbation about a Preloaded State

30 minutes

L3.2

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Here are the steps to be followed:

Substructuring as a Linear Perturbation about a Preloaded State

1. Introduction

2. Substructure Tangent Stiffness

Calculation

3. Response Quantities

4. Effect of Preloads at the Usage Level

5. Preloading Syntax

6. Preloading Example: Rotating

Structure

L4.1

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The following topics are covered in this lesson.

Lesson content:

Dynamic Substructuring

Lesson 4: Dynamic Substructuring

45 minutes

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Here are the steps to be followed:

Dynamic Substructuring

1. Guyan Reduction

2. Dynamic Mode Addition

3. Damping with Substructures

L5.1

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The following topics are covered in this lesson.

Lesson content:

Substructure Output

Lesson 5: Substructure Output

45 minutes

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Here are the steps to be followed:

Substructure Output

1. Introduction

2. Visualizing Substructure Results

3. Output of Eliminated Degrees of

Freedom

4. Output of Substructure Matrices

5. Substructure Library Utilities

L6.1

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The following topics are covered in this lesson.

Lesson content:

Substructuring Examples

Workshop Preliminaries

Workshop 1a: Substructures: Plane Frame Analysis (IA)

Workshop 1a: Substructures: Plane Frame Analysis (KW)

Workshop 1b: Substructures: Surface Mount Analysis (IA)

Workshop 1b: Substructures: Surface Mount Analysis (KW)

Lesson 6: Substructuring Examples

3 hours

Both interactive (IA) and keywords (KW) versions

of the workshops are provided. Complete only

one for each workshop.

L6.2

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Here are the steps to be followed:

Substructuring Examples

1. Cyclic Symmetry

2. Multilevel Substructuring

L7.1

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The following topics are covered in this lesson.

Lesson content:

Using Substructures with Abaqus/Explicit

Workshop 2: Substructures: Beam Impact (IA)

Workshop 2: Substructures: Beam Impact (KW)

Lesson 7: Using Substructures with Abaqus/Explicit

2 hours

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L7.2

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Here are the steps to be followed:

Using Substructures with Abaqus/Explicit

1. Introduction

2. Examples

3. General Concepts

4. Keyword Interface

5. Interactive Interface

6. Postprocessing

7. Technology Notes

L8.1

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The following topics are covered in this lesson.

Lesson content:

Introduction to Submodeling

Lesson 8: Introduction to Submodeling

15 minutes

L8.2

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Here are the steps to be followed:

Introduction to Submodeling

1. Concept of Submodeling

2. Motivation for Submodeling

L9.1

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The following topics are covered in this lesson.

Lesson content:

Submodeling in Abaqus

Lesson 9: Submodeling in Abaqus

30 minutes

L9.2

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Here are the steps to be followed:

Submodeling in Abaqus

1. Fundamental Assumptions

2. Submodeling Techniques

3. Node-based Implementation

4. Surface-based Implementation

L10.1

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The following topics are covered in this lesson.

Lesson content:

Abaqus Usage and Examples (Part 1)

Workshop 3: Submodeling: Pressure Vessel Nozzle Analysis (IA)

Workshop 3: Submodeling: Pressure Vessel Nozzle Analysis (KW)

Lesson 10: Abaqus Usage and Examples (Part 1)

2 ½ hours

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L10.2

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Here are the steps to be followed:

Abaqus Usage and Examples (Part 1)

1. Terminology

2. Transfer of Data

3. Prescribed Values

4. Submodeling Workflow

5. Surface-Based Submodel Boundaries

6. Example: Conical Crack in a Half

Space

7. Example: Pressure Vessel

L11.1

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The following topics are covered in this lesson.

Lesson content:

Abaqus Usage and Examples (Part 2)

Workshop 4: Submodeling: Ceramic-Metal Braze Joint (IA)

Workshop 4: Submodeling: Ceramic-Metal Braze Joint (KW)

Lesson 11: Abaqus Usage and Examples (Part 2)

2 hours

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L11.2

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Here are the steps to be followed:

Abaqus Usage and Examples (Part 2)

1. Node-Based Submodel Boundaries

2. Example: Stacked Sheet Metal

Assembly

3. Example: Large Displacement

Analysis

4. Tolerances at the Submodel Boundary

5. Shell-to-Solid Submodeling

6. Example: Shell-to-Solid Submodel of

a Pipe Joint

L12.1

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The following topics are covered in this lesson.

Lesson content:

Submodeling Practices

Lesson 12: Submodeling Practices

1 hour

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Here are the steps to be followed:

Submodeling Practices

1. Perturbation Analysis

2. Changing Procedures

3. The Frequency Domain

4. Submodeling and Thermal Stress

Analysis

5. Example: Thermal Strain in a Bar

6. Submodeling in Dynamic Procedures

7. Example: Speaker Diaphragm (1/7)

L13.1

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The following topics are covered in this lesson.

Lesson content:

Limitations of Submodeling

Lesson 13: Limitations of Submodeling

15 minutes

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Here are the steps to be followed:

Limitations of Submodeling

1. Elements

2. Procedures

3. Shell-to-Solid

A1.1

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The following topics are covered in this lesson.

Lesson content:

Theory of Substructures

Appendix 1: Theory of Substructures

15 minutes

A1.2

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Here are the steps to be followed:

Theory of Substructures

1. Static Substructuring

2. Guyan Reduction

3. Restrained Mode Addition