ANSYS Workbench LS-DYNA Users Instructions R16.0...2015/04/09 · interface was created using the ANSYS Customization Toolkit (ACT), a product of ANSYS, Inc. designed to enable customization

© 2015 ANSYS, Inc. ANSYS Workbench LS-DYNA R16.0 V1 Users Instructions1/53

ANSYS Workbench LS-DYNAUsers Instructions

Release 16.0

April 9, 2015


Table of Contents

IntroductionInstallation Instructions Problem Setup• Engineering Data

• Geometry

• Body Interactions

• Meshing

• Initial Conditions

• Boundary Conditions

Analysis SettingsResult Processing• Stress

• Strain

• Global Data

• Nodal Output

• Body Data

• Animation

LS-DYNA KeywordsAdditional Information• Documentation

• Changes in R15.0.7

• Changes in R16.0

• Tips

• Technical Support

• License Requirements


Introduction

ANSYS Workbench LS-DYNA is a Graphical User Interface (GUI) for running ANSYS LS-DYNA. It provides the extensive power of ANSYS Workbench environment to facilitate the use of the LS-DYNA program by greatly reducing the effort required to set-up and run complex problems.

Workbench LS-DYNA R16.0 uses LS-DYNA version R7.1.1 Revision 88541

Comprehensive CAD to solution capabilities include:• CAD import from all leading sources• Geometry clean-up to facilitate fast accurate explicit analysis• Parameters usable for optimization based on varying geometry,

material models and boundary conditions• State of the art meshing designed to produce high quality meshes

ideally suited for explicit simulations• Automatic Explicit preference for high quality meshing• Mesh generation in parallel without additional license requirement• Highly efficient parallel simulations• Comprehensive post processing

In summary it is LS-DYNA empowered by ANSYS Workbench for ease of use and quick solutions unmatched by any other comprehensive pre and post processing environment offered in a single intuitive fully interactive, modern Graphical User Interface (GUI).

Workbench LS-DYNA is the result of a collaborative effort between Livermore Software Technology Corporation (LSTC) and ANSYS, Inc. The interface was created using the ANSYS Customization Toolkit (ACT), a product of ANSYS, Inc. designed to enable customization of the user interface of ANSYS products.

Images courtesy of CADFEM GmBH


Introduction

The ANSYS LS-DYNA program is able to run the complete keyword set published in the LS-DYNA® KEYWORD USER'S MANUAL (Version 971 R7.1). In the current implementation, a limited subset of the extensive list of keyword inputs can be generated by Workbench LS-DYNA. The keywords generated through the standard user interface are supported by ANSYS technical support. The following areas of use are not supported with Workbench LS-DYNA:• User-defined material definition• LS-DYNA user subroutines• Mesh-free methods: SPH & EFG• Some special elements such as Seat belt and others• Fluid Structure Interaction (FSI)

Advanced, knowledgeable users may modify the input file generated

and take advantage of the full keyword set, however ANSYS, Inc. does

not provide technical support for modified input files. Note that post-

processing may not work correctly with modified .k files. For those

cases use LS-Prepost available in the standard the installation.

The Workbench LS-DYNA environment is available to all customers with an ANSYS LS-DYNA license and requires that license to run problems (see: License Requirements).

SMP and MPP Parallel processing are both available, they do however require the use of ANSYS LS-DYNA HPC licenses. The standard ANSYS HPC packs and HPC Workgroup licenses do not work with ANSYS LS-DYNA. Use ANSYS LS-DYNA HPC licenses for running in parallel.

These instructions assume that the users is familiar with the Mechanical GUI and the basics of LS-DYNA.


Installation Instructions

If you have not already done so, install the

ANSYS Structural and ANSYS Explicit

products before the Workbench

LS-DYNA installation.

Administrator rights are required to install

Workbench LS-DYNA.

Multiple versions of Workbench LS-DYNA

can be installed with the use of the

environmental variable AWP_ROOT145,

AWP_Root150. and AWP_Root160. Set the

value of the variable to the install directory.

Use this environmental variable for

Network Installations.

Download Workbench LS-DYNA R16.0.zip.

from the Customer Portal Extension Library.

Unzip the file into a temporary directory.

Right click on the setup.exe file and select

Run as administrator.


Installation Instructions

Click Run in Unknown Publisher

warning. Click Next on Welcome page.

Select, “I agree” to accept license, then

follow instructions on the screen.

Start Workbench: Start/All

Programs/ANSYS 16.0/Workbench 16.0

In the Workbench project page select

Tools/Options.


Select Extensions/Manage Extensions

Click on the box to the left of LSDYNA to

add the Workbench LS-DYNA Extension

to Workbench.

Once the installation is complete,

Workbench LS-DYNA will show up in

the Toolbox and you can start to set-up

and run problems. (see Problem Setup)

Saving an empty project with the

extension installed may be useful for

future use so the extension does not

need to be added for each new project.


Un-Installation Instructions

Use the standard Windows

un-installation process.

In the Windows Control Panel select

Add/Remove programs

or Program Features

Select Workbench LSDYNA

Click on Uninstall


Problem Setup: Materials

These instructions will be most useful

for users who are familiar with the

Workbench ANSYS Mechanical user

interface as well as the use of the ANSYS

LS-DYNA program.

For background information or a

refresher, refer to:

Introduction to ANSYS Mechanical 15.0

Problem setup is most efficiently done

when following the workflow offered by

Workbench LS-DYNA. Starting with the

project page:

Start with the Definition of Materials

Models from Engineering Data. Only the

material models supported by ANSYS LS-

DYNA are shown in Engineering Data for

Workbench LS-DYNA.


Problem Setup: Geometry

Select Geometry to be used, by creating

new geometry using DesignModeler or

SpaceClaim.

Alternatively import geometry from a

CAD model or a previously created

(.agdb) file.

Edit Model will start the Mechanical GUI

Once the Mechanical GUI is open the

details of each part of the geometry can

be viewed


Problem Setup: Contact

Body Interaction parameters are

defined in the Connection branch of the

Model tree. Different types of contact

can be selected from the Contact

dropdown menu in the Connection

toolbar.

For the majority of problems Automatic

Contact can be used, requiring no

additional input by the user.

By default all bodies participate in

contact. The default contact is

frictionless, but can be changed.

Details of the contact are shown in the

Details of Body Interaction window.


Problem Setup: Springs

Springs can be added in Connections .

Both Longitudinal Stiffness and Damping

are supported.

Pre-loads are supported since R15.0.

Spring behavior: linear only.


Problem Setup: Meshing

Meshing is a critical part of explicit

simulations. Uniform size hexahedral

elements are ideal for accurate and fast

simulations. For complex geometries it

is difficult to generate an all hex mesh.

Workbench meshing continues to

improve the quality of the mesh

produced. As an example Multizone

meshing can automatically decompose

complex geometry into sweepeable

parts and create an all hex mesh.

Workbench LS-DYNA automatically

selects the explicit preference for

meshing, thus the mesher attempts to

produce a mesh well suited for ANSYS

LS-DYNA. The user need only specify an

element size to be used.


Problem Setup: IC

Initial Conditions can be assigned to

parts by inserting them in the ANSYS

LSDYNA branch or from the Supports

dropdown menu.


Problem Setup: BC

Boundary Conditions (Supports, Loads

and Acceleration) can be assigned to

parts by inserting them in the ANSYS LS-

DYNA branch or from the LS-DYNA

Environment dropdown menus.

Specifications for

Rigid Body and Rigid wall

constraints are available

from the Constraints

dropdown menu


Problem Setup: Nodal Data

To collect Nodal Data, insert one or

more Result Trackers prior to running

the simulation. Result trackers must be

scoped to a node.

Add Nodal Output below the solution,

scope it to a node and select the type of

output.


Analysis Settings

Analysis settings control the running of

the simulation. The End Time is the only

required input.

SMP or MPP parallel processing can be

activated by changing the Number of

CPU’s. Note that ANSYS LS-DYNA HPC

licenses are required for using more

than 1 core.


Analysis Settings

Additional Analysis controls can be used

to select:

Single or double precision

Frequency of result outputs

Frequency of time history outputs

Note that by default Strain results are

not included in the output, and must be

selected by the user.

After the Analysis Settings are specified,

click on Solve to start ANSYS LS-DYNA.


Analysis Settings

Additional Controls

Using Section in the part definition,

additional controls of Element

Formulation and Hourglass Control are

also available to further specify how the

problem is to be run.


Result Processing

Once ANSYS LS-DYNA has been started,

Solution Information will display the

message file as the calculation runs.

Clicking on Stop Solution will terminate

the ANSYS LS-DYNA run.


Result Processing

Stress and Plastic Strain are

written by default (can be

suppressed) but Strain is not

written by default and must

be selected by the user if

desired.

Results can be inserted from

the Solution branch of the

tree.


Result Processing

Results can also be added from the

Solution toolbar

LS-DYNA keeps track of Total Strain and

Plastic Strain. Elastic Strain will always

show as 0. To plot plastic strain, use the

worksheet as shown on the next page.


Result Processing

LS-DYNA keeps track of Total Strain and

Plastic Strain. Elastic Strain will always

show as 0. To plot elastic plastic strain

or elastic strain, click on Solution, then

click on Worksheet

and select from the User Defined Result

Expressions within the Worksheet. Right

click on the expression and select Create

User Defined Result


Results: Nodal data

Time history plots at result trackers are

shown with Nodal Output. They can

show :


Results: Global Data

Time History Outputs (ASCII files) can be

requested. All the files listed below can

be created by ANSYS LS-DYNA from the

Workbench LS-DYNA GUI. Please note

however that some date in the ASCII

files currently can not be viewed .



To view Time History Outputs select the ones desired from

the ASCII drop down menu.

Using LS-DYNA terminology, the following results can be

viewed within Workbench LS-DYNA:

• GLSTAT ( Global Data : Kinetic Energy, Hourglass, ....)

• BNDOUT ( Boundary Conditions Data )

• RCFORC ( Contact Forces Data)

• SPCFORC ( Reaction Forces on Boundary Conditions using *BOUNDARY_SPC ( Fixed Support)

To view Reaction Force

• MATSUM ( Body Data)

• NODOUT ( Nodal Data) Trackers must be defined during pre-processing for the nodal data to

be available during Results processing.



Insert Global Data in Solution.

Define the time histories desired for

each plot In Details of Global Data click

on Tabular Data.

Expand the Datas pop-up box,

then click on the small table symbol,

then select from the dropdown box:

Multiple Items can be selected by

clicking on the Datas symbol again and

selecting the additional items to be

plotted on the same frame.


To view the Global Data time history,

right click on Global Data under Solution

and select Generate. Then click on

Worksheet to view the results.



Results: Contact Force

Insert Contact Forces from the ASCII

dropdown list.

Select Body Interaction in Details of

“Contact Force”.

Right click on Contact Force and select

Generate.


Results: More ASCII Output

Similar to the Contact Force plot,

Material Output (Body data) and

Reaction Force plots can be added from

the ASCII Dropdown list and plotted.


Animations can be generated with one click

select 10 Sec for animation

length and show all data


LS-DYNA Keywords

As noted in the Introduction, only the

keywords generated through the

standard Workbench LS-DYNA user

interface are supported by ANSYS

Technical Support.

This section describes the Keywords that

are generated and lists the Keywords

that are supported.

$# LS-DYNA Keyword file

*KEYWORD

*DATABASE_FORMAT

0 0

*CONTROL_TERMINATION

0.0007 10000000 0.001 1000 100000

*CONTROL_TIMESTEP

0 0.9 0 0 0 0 1 0

0 0 0

*CONTROL_CONTACT

0 0 1 1 1 0 2 0

0 0 0 0 0 0 0 0

0 0 0 0 0 0 0

2 1 0 1 0 1 0.5

0 0 0 0 0 0 0 0

1 0 0 0 1

*CONTROL_ENERGY

2 2 2 2

*CONTROL_ACCURACY

1 4 0

0

*CONTROL_BULK_VISCOSITY

1.5 0.06 -2

*CONTROL_SOLID

1 0 0 0

0 0 0 0 0 0 0 0 0 0

*CONTROL_SHELL

20 1 -1 4 2 1 1 1

0 0 0 0 0 1 1 0

0 0 2

*CONTROL_OUTPUT

1 0 0 0 0 0 0 0

0 0 0 0 0

*CONTROL_PARALLEL

0 0 1 0

*CONTROL_SOLUTION

0 0 0 0


LS-DYNA Keywords Generated - Materials


• Body Interactions

– Frictionless and Frictional creates

*CONTACT_AUTOMATIC_SINGLE_SURFACE

– Angular Velocity

– Both create keyword *INITIAL_VELOCITY.

• Manual Contact Regions

– Bonded creates *CONTACT_TIED keywords, either NODES_TO_SURFACE or

SURFACE_TO_SURFACE with the OFFSET option

– Bonded Breakable creates

*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE_TIEBREAK or

*CONTACT_ONEWAY_AUTOMATIC_SURFACE_TO_SURFACE_TIEBREAK

– Frictionless and Frictional creates *CONTACT_AUTOMATIC keywords, either

NODES_TO_SURFACE or SURFACE_TO_SURFACE

• Spot welds

– Breakable and Non-Breakable creates *CONSTRAINED_SPOTWELD

LS-DYNA Keywords Generated - Model


• Initial conditions

– Velocity

– Angular Velocity

– Both create keyword *INITIAL_VELOCITY.

• Loads

– Inertial: Acceleration and Standard Earth Gravity. Both create keyword

*LOAD_BODY_X, Y or Z depending on direction of acceleration.

– Pressure: creates *LOAD_SEGMENT_SET.

– Force: creates *LOAD_NODE_SET.

• Supports

– Fixed Support: creates *BOUNDARY_SPC.

– Displacement: creates *BOUNDARY_PRESCRIBED_MOTION_SET.

– Velocity : creates *BOUNDARY_PRESCRIBED_MOTION_SET.

– Impedance Boundary: creates BOUNDARY_NON_REFLECTING.

– Simply Supported: creates *BOUNDARY_SPC.

– Fixed Rotation: creates *BOUNDARY_SPC.

LS-DYNA Keywords Generated – Initial and Boundary Conditions


Keywords: User Defined

Advanced users can take advantage of

the file include capability of LS-DYNA by

specifying the name of the file to be

included.

An include file *INCLUDE Filename1

keyword card will be generated pointing

to the file specified by the user.

Included files can contain any valid LS-

DYNA keyword cards created by the

user. Using include files eliminates the

necessity of editing the .k input file by

the user each time the file is created by

Workbench LS-DYNA.

Note that included file can contain other

include file statements, providing a

fairly general capability for simply

adding predefined inputs.

ANSYS Support does not provide

technical assistance for keywords not

generated by Workbench LS-DYNA


The list of supported keyword is listed and explained in a

separate document:

ANSYS Workbench LS-DYNA R16 Supported Keywords.pdf

LS-DYNA Keywords Supported


For an example of a quick step by step problem set-up,

please see the document: ANSYS Workbench LS-DYNA

Problem Set-up Examples.pdf which is part of the extension

package.

ANSYS Workbench LS-DYNA (ACT Extension) Training

The LS_DYNA Keyword User’s Manual (R7.1 May 26, 2014), is

located in the ANSYS installation directory. The default is:

C:\Program Files\ANSYS Inc\v160\ansys\docu

LS-DYNA_manual_Vol_I_R7.1.pdf

LS-DYNA_manual_Vol_II_R7.1.pdf

LS-DYNA_manual_Vol_III_R7.1.pdf

Additional Information: Documentation


For an examples of a quick step by step problem set-up

please see the document:

ANSYS Workbench LS-DYNA Problem Set-up Examples R16.0.pdf

included in this ACT Extension installation file.

also

Workbench LS-DYNA training course material on the ANSYS

Customer Portal:

ANSYS Workbench LS-DYNA (ACT Extension) Training

Additional Information: Training & Tutorials


To be added:

translation from ANSY Mechanical to LS-DYNA terminology

Additional Information: Terminology


Fixes and Changes in R15.0.7 • Fix error in the calculation of fiber orientation when generating ACP LS-DYNA models (*ELEMENT_SHELL_COMPOSITE)

• Fix error in the calculation of the offset value when generating ACP LS-DYNA models (*ELEMENT_SHELL_COMPOSITE)

• Fix error in the naming of MAT_RATE_SENSITIVE_POWERLAW_PLASTICITY

• Fix error in the naming of *MAT_MODIFIED_PIECEWISE_LINEAR_PLASTICITY

• Fix error in the orientation of beams elements

• Fix error with unit system µmks, stresses were not correctly converted to Mechanical units

• Fix error with remote point creation when used with a local coordinate system

• Fix error with definition of tension/compression springs

• Fix error with missing ReferenceAppliedBy property in the joint Definition (the property was filtered)

• Reset the contact default settings for soft behavior back to the R14.5 value (soft=2)

• Change Default Hourglass to type 5

Additional Information: Changes in R15.0.7


Fixes and Changes in R16.0 • Enhanced parameter support

• Boundary condition activation and deactivation

• Adaptivity (AMR)

• Drawbeads

• Scoped acceleration

• Arbitrary Lagrange Euler (ALE)

• Additional controls:

– Cycle limit, result generation by time or cycles

– Start time for initial velocities

– “dynain” file generation

For more information see: R16.0 Workbench LS-DYNA Update

Additional Information: Changes in R16.0


Do not modify the .k file within Workbench

LS-DYNA cannot use pyramid elements

Workbench LS-DYNA with design points

Cancel the Rigid Body Force

Open Solver Files Directory

Generate .rst file

"The current project has been modified. Do you want to save it?"

Commands snippets can be used

With the R16.0 license server old licensing preferences can block

the usage of Workbench LS-DYNA

Additional Information: Tips


• If possible use the “Input File Include” option in the

Constraints drop down menu.

• Alternatively, modify the .k file and launch LS-DYNA

with the Classic APDL Product Launcher and view the

results with LS-Prepost.

• LS-DYNA cannot use pyramid elements. Check the

mesh statistics if you suspect that they may have

been generated by the mesher.

Additional Information: Tips – Caution!

Do not modify the .k file within Workbench


• Check the mesh statistics if you

suspect that they may have been

generated by the mesher.


LS-DYNA cannot use pyramid elements


There is a know problem when using the option to export

each design point (by checking the Exported box in the table

of design points). This writes a new Workbench project for

each design point but the file log.html is deleted and the

Mechanical GUI cannot be opened. Possible error message:

Work around:

Copy the original log.html file to each _dp project.


Workbench LS-DYNA with design points


To cancel the Rigid Body Force

input via the “Tabular Data”

click “cancel” rather than the x

in the upper right corner.


Cancel the Rigid Body Force



Open Solver Files Directory



Generate .rst file



Once Workbench LS-DYNA has been installed, Workbench thinks

that you have made a change to the “project” even before doing

anything, so do not be surprise to see the message shown below

when trying to close Workbench or opening a project.

“The current project has been modified. Do you want to save it?”


• At the body level

– to modify the material, formulation

(section)

– hourglass and equation of state

– Note the section and hourglass can be

se directly through the GUI thus

snippets may not be needed.

• at the contact level

– to use contact types not supported by

Workbench LS-DYNA

• At the environment level

– No command snippets are supported at the

environment level. This capability is partially

replaced by the input file include object


Commands snippets can be used


• Solution:

– Launch the License Mgmt. Center

– Stop the License Manager

– Delete the file:

license.preferences.xml

• Stored in folder:%APPDATA%\Ansys\v160\licensing

– Restart the License Manager


With the R16.0 license server

old licensing preferences can block the usage of Workbench LS-DYNA


Note:

The ANSYS Workbench LS-DYNA User Interface is

available for use only by licensees of: ANSYS LS-DYNA, Legacy LS-DYNA PC & Legacy LS-DYNA PrePost

who are current on TECS.

It is not available for Add-On licenses:

ANSYS Mechanical Emag LS-DYNAANSYS Mechanical LS-DYNAANSYS Multiphysics LS-DYNA

Additional Information: License Requirement


For technical assistance, please contact ANSYS Technical Support using any of the methods below:

Web: http://www1.ansys.com/customer/Phone: 800.711.7199 or 724.514.3600Email: [email protected]

For existing technical support service requests, please reference the service request number when contacting ANSYS Technical Support.

Technical Support

Documents

ANSYS Workbench LS-DYNA Users Instructions R16.0...2015/04/09 · interface was created using the ANSYS Customization Toolkit (ACT), a product of ANSYS, Inc. designed to enable customization