ABAQUS Tutorial: Multiple Step Analysis
1-1- Defining Initial Stresses Using Stress Output From A User-specified Output Database File
1-1-1- Importing Data From An Output Database File
What is Multiple Step Analysis?
Multiple step analysis is an analysis approach used in finite element analysis (FEA) software. It involves performing the analysis in multiple sequential steps that represent different stages of loading or phenomena. This allows the model to simulate time-dependent processes in a step-wise manner.
Some examples of when multiple step analysis is useful:
• Applying loads gradually over time – Instead of applying all loads at once, you can apply them in steps to more accurately simulate how loads develop in reality.
• Simulating transient loads – Loads that vary with time, like impact or impulse loads, can be applied in multiple steps to capture the time-varying nature.
• Modeling time-dependent material behavior – Materials like concrete, polymers, and composites exhibit time-dependent behavior under load. Multiple step analysis allows the material properties to be updated at each step to reflect this.
• Simulating temperature changes over time – Temperature loads can be applied in steps, with the material properties updated accordingly at each step.
• Modeling damage evolution – Damage mechanics models require the damage parameter to be updated at each step based on the cumulative damage. Multiple step analysis facilitates this.
• Integrating with external/internal solvers– Nonlinear analysis often requires iterating between FEA and different external/internal solvers. Multiple step analysis allows data to be exchanged between steps.
What you’ll learn in multiple step analysis
- How to transfer analysis results from Abaqus/standard to Abaqus/explicit
- How to do a sequentially coupled thermal-stress analysis in ABAQUS
- How to define stress, strain, &, etc. as an initial condition in Abaqus
- How to do multi-step analysis in Abaqus
- How to define laminated composite materials
- How to define initial condition by ODB file
- how to perform heat transfer analysis
- How to perform impact analysis
- How to create rigid bodies
- How to create a *.res file
Multiple-step analysis package motivations
- In analyses such as fire analysis, it is necessary to use temperature and stress results in the next analysis as initial conditions.
- Simulate a preloading phase where the capabilities of ABAQUS/Explicit are not needed (no contact, etc.).
- Simulate further forming steps after an intermediary spring back phase.
- Simulate a transient event after steady-state conditions have been found (e.g., with a steady-state transport simulation).
Who this course is for
- Civil and mechanical engineers who need to perform multiple-step analysis
- Advanced students, Ph.D. students, or researchers for their Abaqus FEA projects
- Any Abaqus Application Engineer who is involved with various FEA simulation projects on a daily basis
What you’ll gain
- You will be able to perform multiple-step analysis by Abaqus
- You will be able to improve your ability to use Abaqus solvers (standard, explicit, etc.)
The purpose of this Abaqus tutorial video is to learn how to apply thermal stresses resulting from heat transfer analysis of a composite material as an initial condition for dynamic explicit impact analysis.