Modeling Contact with

Abaqus/Standard

Modeling Contact with Abaqus/Standard

Day 1

• Lecture 1: Introduction

• Lecture 2: Contact Workflow

• Workshop 1 Compression of a Rubber Seal

• Lecture 3: Surface-based Contact

• Workshop 2 Lap Joint Analysis

• Lecture 4: Contact Logic and Diagnostics Tools

• Workshop 3 Bolted Flange Analysis

Modeling Contact with Abaqus/Standard

Day 2

• Lecture 5: Contact Properties

• Workshop 4 Disk Forging Analysis

• Lecture 6: Interference Fits

• Workshop 5 Interference Fit Analysis

• Lecture 7: Additional Features

• Workshop 6 Pipe Reel Analysis

• Lecture 8: Modeling Tips

• Workshop 7 Snap Fit Analysis

Modeling Contact with Abaqus/Standard

Appendices

• Appendix 1: Node-to-Surface Formulation

• Appendix 2: Contact Elements

• Appendix 3: Dynamic Contact using Implicit Integration

Modeling Contact with Abaqus/Standard

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, 2009.

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 6.9-EF Release Notes and the notices at:

http://www.simulia.com/products/products_legal.html.

Modeling Contact with Abaqus/Standard

Revision Status

Lecture 1 9/09 Updated for 6.9-EF

Lecture 2 9/09 Updated for 6.9-EF

Lecture 3 9/09 Updated for 6.9-EF

Lecture 4 9/09 Updated for 6.9-EF

Lecture 5 9/09 Updated for 6.9-EF

Lecture 6 9/09 Updated for 6.9-EF

Lecture 7 9/09 Updated for 6.9-EF

Lecture 8 9/09 Updated for 6.9-EF

Workshop 1 9/09 Updated for 6.9-EF

Workshop 2 9/09 Updated for 6.9-EF

Workshop 3 9/09 Updated for 6.9-EF

Workshop 4 9/09 Updated for 6.9-EF

Workshop 5 9/09 Updated for 6.9-EF

Workshop 6 9/09 Updated for 6.9-EF

Workshop 7 9/09 Updated for 6.9-EF

Answer 1 9/09 Updated for 6.9-EF

Answer 4 9/09 Updated for 6.9-EF

Appendix 1 9/09 Updated for 6.9-EF

Appendix 2 9/09 Updated for 6.9-EF

Appendix 3 9/09 Updated for 6.9-EF

Introduction

Lecture 1

L1.2

Modeling Contact with Abaqus/Standard

Overview

• General Considerations

• Surface-based Contact

• Contact Examples

• Ingredients of a Contact Model

Contact Workflow

Lecture 2

L2.2

Modeling Contact with Abaqus/Standard

Overview

• Defining Contact Pairs

• Defining Surfaces for Contact Pairs

• Defining General Contact

Surface-based Contact

Lecture 3

L3.2

Modeling Contact with Abaqus/Standard

Overview

• Contact Formulations

• Contact Discretization

• Contact Enforcement Methods

• Relative Sliding Between Bodies

• Output of Contact Results

• Summary

Contact Logic and Diagnostics Tools

Lecture 4

L4.2

Modeling Contact with Abaqus/Standard

Overview

• Newton Method

• The Contact Algorithm

• Contact Iterations

• Contact Diagnostics (Visual)

• Contact Diagnostics (Text)

• Understanding the logic that Abaqus uses to solve contact problems is

helpful for:

• Understanding output

• Troubleshooting convergence problems

• Tools are available in Abaqus/CAE to visualize contact output.

• This greatly simplifies the troubleshooting process.

Contact Properties

Lecture 5

L5.2

Modeling Contact with Abaqus/Standard

Overview

• Pressure-Overclosure Models

• Friction Models

• Friction Enforcement

Interference Fits

Lecture 6

L6.2

Modeling Contact with Abaqus/Standard

Overview

• Initial Overclosure

• Strain-free Adjustments

• Interference Fit Problems

• Interference Fit Techniques for Contact Pairs

• Precise Specification of Clearance or Overclosure

• Interference Fit Example

• Geometric Smoothing for Curved Surfaces

Additional Features

Lecture 7

L7.2

Modeling Contact with Abaqus/Standard

Overview

• Tie Constraints

• Rigid Bodies and Contact

• Pre-Tensioning of Cross-Sections

• Pressure Penetration

Modeling Tips

Lecture 8

L8.2

Modeling Contact with Abaqus/Standard

Overview

• Initial Rigid Body Motion

• Overconstraint

• Contact with Quadratic Elements

• Unsymmetric Matrices in Finite-Sliding Problems

• Dynamic Instabilities

• Modeling Corners

Node-to-Surface Formulation

Appendix 1

A1.2

Modeling Contact with Abaqus/Standard

Overview

• Discretization

• Finite-sliding: Surface Considerations

• Small Sliding Characteristics

• Small-sliding: Local Contact Plane

• Small-sliding: Surface Considerations

Contact Elements

Appendix 2

A2.2

Modeling Contact with Abaqus/Standard

Overview

• Surface-Based vs. Contact Element Approach

• Contact Elements

• Output of Results for Contact Elements

• Visualization of Contact Problems (Contact Element Approach)

Dynamic Contact using Implicit Integration

Appendix 3

A3.2

Modeling Contact with Abaqus/Standard

Overview

• Time Integration Issues

• Implicit Dynamics

• Damping

• Impact Problems

• Contact in Linear Perturbation Procedures