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Modeling Fracture and Failure with Abaqus
6.12
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Course objectives Upon completion of this course you will be able to:
Use proper modeling techniques for capturing crack-tip singularities in fracture mechanics problems
Use Abaqus/CAE to create meshes appropriate for fracture studies
Calculate stress intensity factors and contour integrals around a crack tip
Simulate material damage and failure
Simulate crack growth using cohesive behavior, VCCT, and XFEM
Simulate low-cycle fatigue crack growth
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 Basic Concepts of Fracture Mechanics
Lecture 2 Modeling Cracks
Lecture 3 Fracture Analysis
Workshop 1 Crack in a Three-point Bend Specimen
Workshop 2 Crack in a Helicopter Airframe Component
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Day 2
Lecture 4 Material Failure and Wear
Lecture 5 Element-based Cohesive Behavior
Workshop 3 Crack Growth in a Three-point Bend Specimen using Cohesive Connections (Part 1)
Workshop 4 Crack Growth in a Helicopter Airframe Component using Cohesive Elements
Lecture 6 Surface-based Cohesive Behavior
Workshop 3 Crack Growth in a Three-point Bend Specimen using Cohesive Connections (Part 2)
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Day 3
Lecture 7 Virtual Crack Closure Technology (VCCT)
Workshop 5 Crack Growth in a Three-point Bend Specimen using VCCT
Lecture 8 Low-cycle Fatigue
Lecture 9 Mesh-independent Fracture Modeling (XFEM)
Workshop 6 Crack Growth in a Three-point Bend Specimen using XFEM
Workshop 7 Modeling Crack Propagation in a Pressure Vessel with Abaqus using XFEM
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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
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
Workshop 7 5/12 Updated for 6.12
L1.1
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The following topics are covered in this lesson.
Lesson content:
Basic Concepts of Fracture Mechanics
Lesson 1: Basic Concepts of Fracture Mechanics
90 minutes
L1.2
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Here are the steps to be followed:
Basic Concepts of Fracture Mechanics
1. Overview
2. Introduction
3. Fracture Mechanisms
4. Linear Elastic Fracture Mechanics
5. Small Scale Yielding
6. Energy Considerations
7. The J-integral
8. Nonlinear Fracture Mechanics
9. Mixed-Mode Fracture
10. Interfacial Fracture
11. Creep Fracture
12. Fatigue
L2.1
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The following topics are covered in this lesson.
Lesson content:
Modeling Cracks
Lesson 2: Modeling Cracks
90 minutes
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Here are the steps to be followed:
Modeling Cracks
1. Crack Modeling Overview
2. Modeling Sharp Cracks in Two
Dimensions
3. Modeling Sharp Cracks in Three
Dimensions
4. Finite-Strain Analysis of Crack Tips
5. Limitations Of 3D Swept Meshing For
Fracture
6. Modeling Cracks with Keyword Options
L3.1
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The following topics are covered in this lesson.
Lesson content:
Fracture Analysis
Workshop Preliminaries
Workshop 1: Crack in a Three-point Bend Specimen
Workshop 2: Crack in a Helicopter Airframe Component
Lesson 3: Fracture Analysis
3 hours
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Here are the steps to be followed:
Fracture Analysis
1. Calculation of Contour Integrals
2. Examples
a. Penny-shaped crack in an
infinite space
b. Conical crack in a half-space
c. Compact Tension Specimen
3. Nodal Normals in Contour Integral
Calculations
4. J-Integrals at Multiple Crack Tips
5. Through Cracks in Shells
6. Mixed-Mode Fracture
7. Material Discontinuities
8. Numerical Calculations with Elastic-
Plastic Materials
9. Residual Stresses
L4.1
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The following topics are covered in this lesson.
Lesson content:
Material Failure and Wear
Lesson 4: Material Failure and Wear
2 hours
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Here are the steps to be followed:
Material Failure and Wear
1. Progressive Damage and Failure
2. Damage Initiation for Ductile Metals
3. Damage Evolution
4. Element Removal
5. Damage in Fiber-Reinforced
Composite Materials
6. Failure in Fasteners
7. Material Wear and Ablation
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The following topics are covered in this lesson.
Lesson content:
Element-based Cohesive Behavior
Workshop 3: Crack Growth in a Three-point Bend Specimen using Cohesive Connections (Part 1)
Workshop 4: Crack Growth in a Helicopter Airframe Component using Cohesive Elements
Lesson 5: Element-based Cohesive Behavior
3 hours
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Here are the steps to be followed:
Element-based Cohesive Behavior
1. Introduction
2. Element Technology
3. Constitutive Response
4. Viscous Regularization
5. Modeling Techniques
6. Examples
L6.1
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The following topics are covered in this lesson.
Lesson content:
Surface-based Cohesive Behavior
Workshop 3: Crack Growth in a Three-point Bend Specimen using Cohesive Connections (Part 2)
Lesson 6: Surface-based Cohesive Behavior
90 minutes
L6.2
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Here are the steps to be followed:
Surface-based Cohesive Behavior
1. Surface-based Cohesive Behavior
2. Element- vs. Surface-based Cohesive
Behavior
L7.1
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The following topics are covered in this lesson.
Lesson content:
Virtual Crack Closure Technique (VCCT)
Workshop 5: Crack Growth in a Three-point Bend Specimen using VCCT
Lesson 7: Virtual Crack Closure Technique (VCCT)
2 hours
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Here are the steps to be followed:
Virtual Crack Closure Technique (VCCT)
1. Introduction
2. VCCT Criterion
3. LEFM Example using
Abaqus/Standard
4. LEFM Example using Abaqus/Explicit
5. Output
6. Ductile Fracture with VCCT
7. VCCT Plug-in
8. Comparison with Cohesive Behavior
9. Examples
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The following topics are covered in this lesson.
Lesson content:
Low-cycle Fatigue
Lesson 8: Low-cycle Fatigue
1 hour
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Here are the steps to be followed:
Low-cycle Fatigue
1. Introduction
2. Low-cycle Fatigue in Bulk Materials
3. Low-cycle Fatigue at Material
Interfaces
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The following topics are covered in this lesson.
Lesson content:
Mesh-independent Fracture Modeling (XFEM)
Workshop 6: Crack Growth in a Three-point Bend Specimen using XFEM
Workshop 7: Modeling Crack Propagation in a Pressure Vessel with Abaqus using XFEM
Lesson 9: Mesh-independent Fracture Modeling (XFEM)
3 hours
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Here are the steps to be followed:
Mesh-independent Fracture Modeling (XFEM)
1. Introduction
2. Basic XFEM Concepts
3. Damage Modeling
4. Creating an XFEM Fracture Model
5. Example 1 – Crack Initiation and
Propagation using Cohesive Damage
6. Example 2 – Crack Initiation and
Propagation using LEFM
7. Example 3 – Low Cycle Fatigue
8. Example 4 – Propagation of an
Existing Crack
9. Example 5 – Delamination and
Through-thickness Crack Propagation
10. Example 6 – Contour Integrals
11. Modeling Tips
12. Limitations
