A Roadmap to Linear and Nonlinear Implicit Analysis in LS-DYNA

Below is a condensed presentation of our paper "A Roadmap to Linear and Nonlinear Implicit Analysis in LS-DYNA" that we presented at the 11th International LS-DYNA User's Conference in Salzburg, Austria on May 9-11, 2017.

Here's the Abstract: The default LS-DYNA settings are tailored for running large explicit analyses. For new and even experienced users, it can be challenging setting up an implicit LS-DYNA analysis to match analytical solutions or other standard implicit FEA codes. For example, the default element formulations are based on single-point integration whereas implicit analyses benefits from full-integration. A series of example problems are provided that will allow the simulation engineer to exactly match industry standard implicit codes (complete keyword decks can be found at Along with these example decks, CPU-scaling results will be presented for each implicit analysis type from linear to nonlinear.

We hope you enjoy it as well as our soundtrack selection.

Why Your Project Will be Right

Predictive Engineering has been offering mechanical engineering analysis services for more than twenty years. We have over 800+ successful projects to our credit. Our work has been strain gauged, drop-tested, benchmarked, validated, proof tested, shaker-tabled and implemented in hundreds of designs. We have optimized structures from deep-diving submarines, tail rotor blades on a Sikorsky Helicopter, high-temperature hydrogen reactors, composite antenna systems, 3,000 HP transmissions, NQA-1 nuclear waste processing vessels to R&D satellites for the US Air Force. Additionally, we have extensive experience with LS-DYNA over the last 15 years and have done projects on: projectile impact, pyro-shock detonation, fracture of ductile and brittle materials, drop-testing of composite structures, electron-beam welding and impact of metal, plastic, elastomer and foam structures. Least we be too technical, we have also successfully modeled the shaker-table transport of French fries using the discrete element method (DEM).

Our next FEMAP and NX Nastran training course

We've held our biannual FEMAP trainings for so long now, you can set your seasonal clock by it. If it's spring or fall in Portland, you can count on FEMAP training

Our next scheduled week-long course will be the week of April 24th. As always we'll take the user from the ground floor through FEA best practices. We'll then move into advanced subjects dealing with manifold and non-manifold surface modeling, detailed plate meshing, and tet versus hex meshing.

The fifth day of the course is optional for an additional cost of $575. It finishes with a focus on FEMAP's API interface, a key method for customization and automation.

We recently finished our first-ever online FEMAP API course. It was six sessions totalling over 9 hours of class notes, workshops and instruction. We'll be looking at future options, both for more live online classes and for a self-directed API course based on our new material.

Need FEMAP training for a large group? As always we're available for customized onsite training, just reach out and contact us.


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