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Abaqus/Explicit: Advanced Topics

6.12

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

Use the explicit dynamics method effectively, including the application of general contact, mass scaling, and

adaptive remeshing

Use Abaqus/Explicit and Abaqus/Standard together to solve difficult problems, including results transfer and

co-simulation

Model high-strain-rate deformation and failure

Filter output

Targeted audience

Simulation Analysts

Prerequisites This course is recommended for engineers with experience using Abaqus

About this Course

3 days

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Day 1

Lecture 1 Overview of Abaqus/Explicit

Workshop 1 Conditional Stability of Abaqus/Explicit

Lecture 2 Elements

Lecture 3 Contact Modeling

Workshop 2 Impact of a Dodge Caravan Bumper Against a Rigid Barrier

Lecture 4 Quasi-Static Analyses

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Day 2

Lecture 5 Adaptive Meshing and Distortion Control

Workshop 3 Quasi-static Analysis of a Rubber Bushing

Lecture 6 Constraints and Connections

Lecture 7 Impact and Postbuckling Analyses

Workshop 4 Crushing of a Tube

Lecture 8 Material Damage and Failure

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Day 3

Lecture 9 Managing Large Models: Part 1

Lecture 10 Managing Large Models: Part 2

Lecture 11 Output Filtering

Lecture 12 Importing and Transferring Results

Workshop 5 Bird Strike Simulation

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Additional Material

Appendix 1 Explicit Dynamics Algorithm

Appendix 2 Features of General Contact and Contact Pairs

Appendix 3 Advanced Adaptive Meshing

Appendix 4 VUMAT

Appendix 5 Abaqus/Standard to Abaqus/Explicit Co-simulation

Workshop 6 Beam Impact Co-simulation

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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

Appendix 1 5/12 Updated for 6.12

Appendix 2 5/12 Updated for 6.12

Appendix 3 5/12 Updated for 6.12

Appendix 4 5/12 Updated for 6.12

Appendix 5 5/12 Updated for 6.12

Workshop 1 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

Workshop 5 5/12 Updated for 6.12

Workshop 6 5/12 Updated for 6.12

L1.1

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The following topics are covered in this lesson.

Lesson content:

Overview of Abaqus/Explicit

Workshop Preliminaries

Workshop 1: Conditional Stability of Abaqus/Explicit (IA)

Workshop 1: Conditional Stability of Abaqus/Explicit (KW)

Lesson 1: Overview of Abaqus/Explicit

2 hours

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L1.2

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Here are the steps to be followed:

Overview of Abaqus/Explicit

1. What is Explicit Dynamics?

2. Abaqus/Explicit vs. Abaqus/Standard

3. Some Challenging Problems

4. Defining an Abaqus/Explicit Procedure

5. Stable Time Increment

6. Bulk Viscosity Damping

7. Energy Balance

8. Monitoring Diagnostic Messages

9. Output

L2.1

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The following topics are covered in this lesson.

Lesson content:

Elements

Lesson 2: Elements

1 hour

L2.2

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Here are the steps to be followed:

Elements

1. Introduction

2. Element Types Overview

3. Hourglassing and Locking

4. Second-order Accuracy

L3.1

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The following topics are covered in this lesson.

Lesson content:

Contact Modeling

Workshop 2: Impact of a Dodge Caravan Bumper Against a Rigid Barrier (IA)

Workshop 2: Impact of a Dodge Caravan Bumper Against a Rigid Barrier (KW)

Lesson 3: Contact Modeling

90 minutes

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L3.2

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Here are the steps to be followed:

Contact Modeling

1. Contact in Abaqus/Explicit

2. Defining General Contact

3. General Contact Output

4. Limitations of General Contact

L4.1

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The following topics are covered in this lesson.

Lesson content:

Quasi-Static Analyses

Lesson 4: Quasi-Static Analyses

90 minutes

L4.2

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Here are the steps to be followed:

Quasi-Static Analyses

1. Introduction

2. Quasi-Static Simulations Using Explicit

Dynamics

3. Loading Rates

4. Energy Balance in Quasi-Static

Analyses

5. Mass Scaling

6. Viscous Pressure

7. Summary

L5.1

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The following topics are covered in this lesson.

Lesson content:

Adaptive Meshing and Distortion Control

Workshop 3: Quasi-static Analysis of a Rubber Bushing (IA)

Workshop 3: Quasi-static Analysis of a Rubber Bushing (KW)

Lesson 5: Adaptive Meshing and Distortion Control

90 minutes

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L5.2

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Here are the steps to be followed:

Adaptive Meshing and Distortion Control

1. Lagrangian and Eulerian Descriptions

2. Arbitrary Lagrangian-Eulerian (ALE)

Method

3. Lagrangian Adaptive Mesh Domains

4. Element Distortion Control

L6.1

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The following topics are covered in this lesson.

Lesson content:

Constraints and Connections

Lesson 6: Constraints and Connections

2 hours

L6.2

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Here are the steps to be followed:

Constraints and Connections

1. Introduction

2. Surface-Based Coupling Constraints

3. Connector Elements

4. Surface-Based Ties

5. Mesh-Independent Fasteners

6. Cohesive Connections

7. Virtual Crack Closure Technique

8. Tips

L7.1

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The following topics are covered in this lesson.

Lesson content:

Impact and Postbuckling Analyses

Workshop 4: Crushing of a Tube (IA)

Workshop 4: Crushing of a Tube (KW)

Lesson 7: Impact and Postbuckling Analyses

90 minutes

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:

Impact and Postbuckling Analyses

1. Impact Analysis

2. Geometric Imperfections for

Postbuckling Analyses

L8.1

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The following topics are covered in this lesson.

Lesson content:

Material Damage and Failure

Lesson 8: Material Damage and Failure

90 minutes

L8.2

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Here are the steps to be followed:

Material Damage and Failure

1. Progressive Damage and Failure

2. Damage Initiation

3. Damage Evolution

4. Element Removal

5. Damage in Fasteners

L9.1

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The following topics are covered in this lesson.

Lesson content:

Managing Large Models: Part 1

Lesson 9: Managing Large Models: Part 1

90 minutes

L9.2

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Here are the steps to be followed:

Managing Large Models: Part 1

1. Introduction

2. Simplifying the Model

3. Parallel Execution

4. Techniques for Reducing CPU Time

5. Tips

L10.1

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The following topics are covered in this lesson.

Lesson content:

Managing Large Models: Part 2

Lesson 10: Managing Large Models: Part 2

60 minutes

L10.2

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Here are the steps to be followed:

Managing Large Models: Part 2

1. Submodeling

2. Restart

3. Parts and Assemblies

L11.1

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The following topics are covered in this lesson.

Lesson content:

Output Filtering

Lesson 11: Output Filtering

90 minutes

L11.2

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Here are the steps to be followed:

Output Filtering

1. Introduction

2. What is aliasing?

3. Preventing aliasing

4. Abaqus/Viewer postprocessing filters

5. Filter options

6. Filter distortions

7. References

L12.1

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The following topics are covered in this lesson.

Lesson content:

Importing and Transferring Results

Workshop 5: Bird Strike Simulation (IA)

Workshop 5: Bird Strike Simulation (KW)

Lesson 12: Importing and Transferring Results

2 hours

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

L12.2

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Here are the steps to be followed:

Importing and Transferring Results

1. Introduction

2. Import from Abaqus/Explicit to

Abaqus/Standard

3. Import from Abaqus/Standard to

Abaqus/Explicit

4. Additional Import Modeling Issues

5. Limitations

6. Import from Abaqus/Explicit to

Abaqus/Explicit

7. Demonstration

A1.1

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The following topics are covered in this lesson.

Lesson content:

Explicit Dynamics Algorithm

Appendix 1: Explicit Dynamics Algorithm

30 minutes

A1.2

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Here are the steps to be followed:

Explicit Dynamics Algorithm

1. Explicit Dynamics Algorithm

A2.1

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The following topics are covered in this lesson.

Lesson content:

Features of General Contact and Contact Pairs

Appendix 2: Features of General Contact and Contact Pairs

60 minutes

A2.2

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Here are the steps to be followed:

Features of General Contact and Contact Pairs

1. Features of General Contact

2. Contact Pairs

A3.1

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The following topics are covered in this lesson.

Lesson content:

Advanced Adaptive Meshing

Appendix 3: Advanced Adaptive Meshing

75 minutes

A3.2

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Here are the steps to be followed:

Advanced Adaptive Meshing

1. Eulerian Adaptive Mesh Domains for

Steady-State Analyses

2. Adaptive Meshing Output and

Diagnostics

3. Additional Features of Adaptive

Meshing

A4.1

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The following topics are covered in this lesson.

Lesson content:

Writing a VUMAT

Appendix 4: Writing a VUMAT

60 minutes

A4.2

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Here are the steps to be followed:

Writing a VUMAT

1. Introduction

2. Motivation

3. Steps Required in Writing a VUMAT

4. VUMAT Interface

5. Example: VUMAT for Kinematic

Hardening Plasticity

A5.1

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The following topics are covered in this lesson.

Lesson content:

Abaqus/Standard to Abaqus/Explicit Co-simulation

Workshop 6: Beam Impact Co-simulation (IA)

Workshop 6: Beam Impact Co-simulation (KW)

Appendix 5: Abaqus/Standard to Abaqus/Explicit Co-simulation

3 hours

Both interactive (IA) and keywords (KW) versions

of the workshop are provided. Complete only one.

A5.2

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Here are the steps to be followed:

Abaqus/Standard to Abaqus/Explicit Co-simulation

1. Introduction

2. Examples

3. Co-simulation modeling

a. General concepts

b. Keyword interface

c. Interactive interface

4. Postprocessing

5. Substructuring

6. Technology notes