
Explicit Structural Mechanics Using Workbench LS-DYNA
Statics is a thing of the past - highly nonlinear dynamic simulations for real deformations

In this training, you will learn how to simulate quasi-static processes (forming/joining) and dynamic processes (drop test/crash) with LS-DYNA. This training is offered as a 3-day course or alternatively as a self-paced eLearning course.
Duration
3 days
Prerequisites
Basic knowledge of Ansys Mechanical
Software used
Ansys LS-DYNA
- Using LS-DYNA in the conventional Mechanical environment
- Being able to take advantage of the benefits of explicit time integration
- Being able to reliably complete highly non-linear tasks
- Understanding the criteria for assessing the quality of results
Description
For structural mechanics tasks with pronounced non-linearities and/or short-duration dynamic effects, explicit time integration is a suitable computation method. In this training, you will begin by learning the requisite knowledge of the theory and application of explicit FEM. The focus topics of the course are modeling in Ansys Workbench and considering non-linear materials and contacts. Using realistic examples, you will learn to simulate quasi-static processes such as forming and joining, or dynamic processes such as drop and impact tests. For displaying results, we will introduce LS-PrePost in addition to Ansys Mechanical for advanced evaluations. We will also provide you with the necessary decision-making criteria for assessing the quality of results.
You will learn how to use LS-DYNA in the Workbench environment. You will know how to take advantage of the benefits of explicit time integration and be able to use LS-DYNA for your own applications.
This training is aimed at users whose responsibilities involve short duration dynamics, such as drop tests and crashes. In addition, it will be of interest to all simulation engineers seeking a solution to highly non-linear tasks in structural mechanics.
Get a first impression and test the first eLearning module of this training course without any obligation. No costs, no notice period.
Detailed agenda for this 3-day training
Day 1
01 Theory and Workbench LS-DYNA
- Method selection for the simulation of large deformations, complex contacts, and nonlinear materials
- Comparing explicit and implicit solvers
- Timestep for explicit methods
- Integration of LS-DYNA in Ansys Workbench
- Exercise: Taylor Impact
02 Analysis settings and postprocessing
- Analysis settings: End time, mass scaling, and number of CPUs
- Extend LS-DYNA result files individually (Output Controls)
- Result files and their evaluation in the Workbench
- Demo: Taylor Impact result evaluation
03 Loads, boundary conditions and rigid bodies
- Definition of loads and boundary conditions for an LS-DYNA model in the Workbench
- Special features of rigid bodies and point masses
- Exercise: "Profile bending" forming process with rigid tools
04 LS-PrePost and keyword snippets
- Post-processing with LS-PrePost: Introduction and Best Practice
- Demo: Result evaluation with LS-PrePost inside Workbench
- Building an LS-DYNA input file (*Keyword)
- Possibilities of keyword snippets
- Creating keywords in LS-PrePost
Day 2
05 Contacts and body interaction
- Body Interaction: self-contact for all cases
- Contacts under frictional influence
- Bonded contacts and their many possibilities
- Visualization of typical contact results
- Defining various contact options
- Exercise: Impact of a pipe
06 Contact settings
- Options for matching contact stiffnesses (Penalty & Soft Constrain Formulation)
- Tips for using contact options
- How do keyword snippets work for the contact?
- Exercise: Crimping process with complex contact situation
07 Quasi-static analysis and result verification
- What is the difference between quasi-static and dynamic analyses?
- Checking the energy balance and evaluating the simulation
- What other results need to be checked?
- Exercise: Quasi-static calculation of a three-point bending test
08 Engineering data and material models
- Which LS-DYNA materials are available in the Workbench (Engineering Data)?
- Special LS-DYNA material models and their definition within the Workbench
- Importing material cards using keyword snippets
- Exercise: Deep drawing process with plastic anisotropy
Day 3
09 Meshing and element formulations
- What is Hourglassing and how can the Hourglass control be applied?
- Element formulations for solid elements, shells, and beams in LS-DYNA Solver
- Why does an explicit calculation need a corresponding mesh? (Implementation in Mechanical)
- Tips on mesh generation for an explicit analysis
- Demo: Plate bending with various element types
10 Connections
- Connections using discrete elements and beams
- Joints and their definition
- Creating connections to rigid bodies (Rigid Body Extra Nodes)
- Demo: Mechanisms with joints and beam connections (bolts)
11 Workshop cell phone drop test
- Model creation with non-linear contacts, meshing, and materials definition
- Computation execution
- Results evaluation and model check
- Discussion of results
- Problem handling for contacts and element formulation
12 Overview of advanced topics
- Restart
- Bolt preload and dynamic relaxation
- Multistage computation: birth and death for boundary conditions and contacts
- Initial stresses
- Initial penetrations and interference contacts
- Demo: Dynamic relaxation
- Demo: Interference contacts
Your Trainers

Ralph Rauchheld

Dr.-Ing. Ulrich Stelzmann

Dr. sc. ETH Manfred Maurer

Bernard Feuillard

Dr. Ing. Benoit Fontenier

Ian Turner
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