Techniques and Tips for Building Robust, Accurate and Efficient Abaqus Models
Advances in computer and solver technology, pre-processing capabilities and powerful new functionality with every release of Abaqus have made the analysis of large assembly models commonplace. Notwithstanding these developments, the consequences of adopting poor modeling techniques and a failure to systematically evaluate the quality of the models built seems to have more of an impact than ever. Poorly built models can unnecessarily consume computational resources for extended periods of time. Models not carefully built can also display a lack of robustness and exhibit non-convergence when redesigned parts are inserted into the assembly model. Perhaps most seriously, powerful techniques that help the analyst resolve initial rigid body motion issues and overcome local buckling and other instabilities are often misused leading to grossly inaccurate results. This seminar will focus on techniques and tips for building more robust and efficient models and discuss strategies to evaluate the accuracy of the results predicted by the model. The topics that will be covered include:
• Linear/Coarse/Simplified Models: Scoping, prepping and debugging.
• Preventive Care: Using syntaxcheck and datacheck analyses.
• Loads and Boundary Conditions: what to do and what to avoid.
• Material Properties: Keeping the engineering problem to be solved at the forefront.
• Initial Rigid Body Motion: Strategies and checks.
• Static Stabilization: When and why to use and more importantly when not to use.
• Overconstraints: Learning to fix overconstraint issues for contact situations and connector elements.
• Element Selection: Hazards and pitfalls, good safe choices.
• Output: Free body diagrams, load paths, contact output, heat transfer output.
• Implicit Dynamics: Usage guidance.
• Simple explanations of important Abaqus concepts that effect modeling choices: implicit vs. explicit dynamics, penalty methods vs. Lagrange multipliers etc.