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From Explicit to Implicit Simulation Models in Ansys LS-DYNA

Course Overview

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 the basic setup 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.

Prerequisites

  • Basic knowledge of LS-DYNA or prior completion of the Introduction to Ansys LS-DYNA course is recommended.

Teaching Method

Lectures and computer practical sessions to validate acquired knowledge. 

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Learning Outcome

Following completion of this course, you will be able to:

  • Convert complex LS-DYNA models originally intended for explicit analyses to work also for implicit, quasi-static simulations.
  • Select element formulations and material models suitable for implicit analyses.
  • Define Mortar contacts.
  • Set up analyses of a sequence of load steps.
  • Tailor implicit solution settings for your particular application.
  • Troubleshoot issues related to implicit convergence.

 Available Dates

Currently, no training dates available

Learning Options

Training materials for this course are available with an Ansys Learning Hub Subscription. If there is no active public schedule available, private training can be arranged. Please contact us.

 Agenda

This is a 2-day classroom course covering both lectures and workshops. For virtual training, this course is covered over 2 x 2-hour sessions lectures only.

Virtual Classroom Session 1 / Live Classroom Day 1

  • Module 1 – Background and Basics
  • Workshop – Bending Stiffness of a Crash Box
  • Workshop – Torsional Stiffness of a BiW
  • Module 2 – Contacts
  • Workshop – Bolt Pre-Tensioning and Contact
  • Workshop – Plastic Bending
  • Module 3 – Multiple Load Steps
  • Workshop – Torque Loading of a Pipe Joint
  • Workshop – Basic Set Up of L-Bracket
  • Module 4 – Element Types and Material Models
  • Workshop – Rubber Block Indentation
  • Workshop – Tensile Test (Shell Model)
  • Workshop – Closing of a Hatch

Virtual Classroom Session 2 / Live Classroom Day 2

  • Module 5 – Advanced Setup
  • Workshop – Compression w/Failure
  • Workshop – Rubber Block Indentation (cont’d)
  • Module 6 – Troubleshooting Convergence Issues
  • Workshop – Poor Convergence of a ROPS Analysis
  • Workshop – Problematic Hood Assembly
  • Workshop – Poor Convergence of Plastic Bending
  • Module 7 – Conversion Examples
  • Workshop – Explicit to Implicit: Door Stiffness
  • Workshop – Explicit to Implicit: Instrument Panel Overload
  • Workshop – Explicit to Implicit: Dummy Seating

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