Training Course Descriptions
Contact in Abaqus/Standard and Other Convergence Issues
Objective:
This 3-day course is a combination of two existing 2-day courses offered by SIMULIA:
This combined course provides an in-depth discussion of the details of using contact in Abaqus/Standard with an emphasis on convergence-related issues for contact, complicated material models, and geometrically unstable behavior in both Abaqus/Standard and Abaqus/Explicit.
With respect to contact analyses, SIMULIA engineers have developed many techniques and guidelines for solving challenging contact problems. This seminar teaches users how to:
- Define appropriate surfaces (rigid or deformable)
- Model frictional contact
- Model large sliding between deformable bodies
- Analyze dynamic impact problems
- Resolve overclosures in interference fit problems
- Avoid overconstraining the model
- Avoid rigid body motions and unstable motions
- Use pre-tension sections to simulate assembly loads
With respect to convergence issues, many years of practical experience in understanding and resolving convergence issues have been condensed into this course. Some of the topics to be covered are:
- How nonlinear problems are solved in Abaqus
- How to develop Abaqus models that will converge
- How to identify modeling errors that cause models to experience convergence difficulties
- How to recognize when a problem is too difficult or too ill-posed to be solved effectively
The hands-on workshops included in the course provide an opportunity to use the concepts developed in the lectures and to learn how to post-process the results of these analyses.
Who should attend:
This course is recommended for engineers with experience using Abaqus/Standard.
Agenda (May vary with location)
| Day 1 | Defining Contact in Abaqus
Finite Sliding
Small Sliding
Frictional Contact
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| Day 2 | Output and Post-processing
Contact Modeling Techniques
Introduction to Nonlinear FEA
Nonlinear FEA with Abaqus/Standard
Solution of Unstable Problems
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| Day 3 | Why Abaqus Fails to Find a Converged Solution
Convergence Issues: Element Behavior
Convergence Issues: Constraints and Loading
Convergence Issues: Material Behavior
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Additional Material
The Contact Element Approach
Thermal-Stress Interfaces
Pore Pressure Interface Elements
Contact in Dynamics: Implicit Integration
When seals are compressed, complex contact conditions usually develop. As this seal is compressed between two rigid bodies, the green surface folds over and contacts the red surface on the middle portion of the seal. As the seal continues to be compressed, the middle portion bends down to correct the lowest portion.
Many assembly processes involve highly nonlinear motions of the components. Obtaining a converged solution is challenging when components snap together, as occurs when the pipe is pushed into the plastic clip. The nodes shown in red have difficulties resolving the changing contact conditions in the assembly. This seminar will explain the modeling techniques necessary to solve such challenging problems.
Course was last updated April 2006
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