LS-DYNA-Intro 14.5 L12 Quick Guide to ANSYS LS-DYNA Extension

© 2012 ANSYS, Inc. November 8, 2012 1 Release 14.5

14.5 Release

Lecture 12 Introduction to ANSYS LS-DYNA Extension

Introduction to ANSYS LS-DYNA


• ANSYS LS-DYNA in Workbench

– Very powerful for geometry modeling and mesh generation

– Extremely easy to setup contact and boundary conditions

– Capability of design optimization

– Have to start three different user interfaces for pre-processing, solving, and post-processing

• ACT (Application Extension Toolkit)

– Easy to use and comprehensive toolkit for performing customization within ANSYS Mechanical

– Become full release in R14.5

What is ANSYS LS-DYNA Extension


• ANSYS LS-DYNA Extension: ANSYS LS-DYNA integrated with ACT Interface

– Single user interface that integrates pre-processing, solving, and post-processing together

– Much convenient and easy to use

– Partnered with LSTC in its development

– Available after R14.5 release

– Work with existing ANSYS LS-DYNA license

– User can customize user interface to expand its features by themselves with the least amount of work, when they have ACT development license from ANSYS

What is ANSYS LS-DYNA Extension


• In ANSYS R14.5 Workbench, “Extension” is added into the pull-down menu

• Click on Extension and then Install Extension to browse to the file “LSDYNA.wbex” and install ANSYS LS-DYNA Extension

Start ANSYS LS-DYNA Extension


• Click on Extension again and then Manage Extension

• In Extension Manager, check the box of LSDYNA and then Close to load the extension

• ANSYS LS-DYNA system will be added under Analysis System in Workbench Toolbox as a new system. See next slide.



• To create an ANSYS LS-DYNA project

– Drag and drop ANSYS LS-DYNA system to Project Schematic

– Or double click on ANSYS LS-DYNA system



• Workshop 8 “Soft Ring Impact” in the ANSYS LS-DYNA Training course is used to demonstrate the use of ANSYS LS-DYNA Extension

• In the Workshop 8, Keyword Snippet is used to

– Change the contact type

– Increase the slave penalty stiffness

– So over-penetration could be prevented between the soft and the hard materials

• Using ANSYS LS-DYNA Extension, slave penalty stiffness can be specified directly in user interface. No need to use Keyword Snippet.



• In Engineering Data, add a new material Soft

Model Setup in ANSYS LS-DYNA Extension


• In Geometry, load the geometry file of soft ring and hard wall

• Double click on Model to open the model




ANSYS LS-DYNA Extension Pre and Post Toolbar


• Pre-processing toolbar

– For each Part in the model

• Specify different Section properties such as element formulations

• Specify different Hourglass Controls

• Define Airbag, not available in R14.5

– Include more contact definitions and Constraints

– Define Results Trackers for Time History plot

• Post-processing toolbar

– Enable ASCII output plot

• More options will be added into the toolbar in future

Overview of the Extension Toolbar


• Complete definition of geometry



• Under Step Controls of Analysis Settings,change End Time to 5E-4 s

• More options are available


Memory Allocation, HPC

Switching analysis type, single/double precision, units

Specify global damping

Specify global hourglass control

Specify global control if model has ALE parts

Specify output control


• Under Output Controls of Analysis Settings

– Change Calculate Results At to Equally Spaced Points

– Change Value to 100

• Under Time History Output Controls of Analysis Settings

– Change Calculate Results At toEqually Spaced Points

– Change Value to 10

– Change Output to Global Data



• Right click on Analysis Settings to apply Fixed Support boundary condition to the Wall

• More boundary condition types areavailable

– Fixed Rotation

– Elastic Support

– Nodal Force

– Nodal Displacement

– Temperature

– Convection

– Heat Flux

– Radiation


Not available in R14.5


• Right click on Initial Condition to insert Velocity and scope it to Ring

– X Component = 0 m/s

– Y Component = 200 m/s

– Z Component = -150 m/s



• Right Click on Solution and then Insert Deformation and Total

• Save the project

• Click on Solve to run the simulation



Solve Output under Solution Information


• Contains the following information

– LS-DYNA version number and your system information

– Initialization details

– Warning messages

– Error messages

– Time step size and other cycle details

– Timing information

• If these is a problem with your model, look at the Solver Output first to diagnose the problem

• If you need to submit a Service Request to ANSYS Technical Support, make sure the Solver Output (or files d3hsp and messag) is attached to the Service Request

Solve Output under Solution Information


• Plot Total Deformation, observe the over-penetration

Post-Processing Results in the LS-DYNA Extension

Over-Penetration


• Under Connections and then Contacts, create Frictionless – Ring To Wall with Top as the Shell Face

• Suppress Body Interaction

• Right click on ANSYS LS-DYNA and then insert Contact Properties

• Change Contact toFrictionless – Ring To Wall

• Change Type to Forming

• Change Slave Penalty Scale Factor to10

• Change Master Penalty Scale Factor to 1

• Click on Solve to re-run the analysis



Post-Process Solution: No Over-Penetration


• In LSDYNA Post tool bar, click on ASCII and then Global Data

• Global Data will be inserted under Solution

• Click on Tabular Data in the details of Global Data

• Click on the symbol in the Tabular Data to add a new line

Post-Process Solution: Time History


• Click on the yellow field to see the list and then select the variable, for example, Kinetic Energy

• Click on the symbol and then the yellow field again to add more variables such as Total Energy, Internal Energy, Hourglass Energy, and External Work to Tabular Data

• Click on Apply to plot time history of these variables



• Click on Worksheet on the top tool bar to show the time history plot


LS-DYNA-Intro 14.5 L12 Quick Guide to ANSYS LS-DYNA Extension

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