From Explicit to Implicit Simulation Models in LS-DYNA

Product development today means satisfying requirements within a variety of fields like crash safety, durability and sound comfort for a passenger car. In a CAE-driven development process, this putshigh demands on the multi-disciplinary capabilities of analysis tools. The one-code strategy of LS-DYNA provides a complete solution for these demands, making it possible to use the same analysis model for many different load cases, from largedeformation rapid events like drop test and crash analyses to non-linear quasi-static analyses, and linear dynamics in the frequency domain.

Many possibilities exist to reuse the same models developed for rapid events and explicit time integration also for non-linear quasi-static analyses and linear statics with only minor modifications, and many users could benefit from taking advantage of these.

This course addresses the conversion of an existing explicit LS-DYNA model to an implicit version of it. In detail, it focuses on how to set up non-linear implicit analyses in LS-DYNA starting out from explicit (crash-worthiness-type) models. It is a hands-on course with many workshop examples, ranging from basic set-up of linear stiffness analyses to more involved non-linear sub-system analyses. Practical troubleshooting tips and guidance on how to avoid many common pitfalls are also given.

No previous knowledge of implicit analyses in LS-DYNA is required, as the course starts out on a basic level in this filed, but basic knowledge of LS-DYNA or prior attendance at the seminar „Introduction to LS-DYNA“ is recommended.

Content

- Basic set-up using control card templates
- Contacts
- Multiple load steps
- Elements and materials for implicit analyses
- Advanced set-up: possible control card modifications
- Troubleshooting convergence issues
- Conversion examples