ANSYS Workbench LS-DYNA Users Instructions

ANSYS Workbench LS-DYNA Users Instructions

Release 16.0 April 9, 2015 © 2015 ANSYS, Inc.

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ANSYS Workbench LS-DYNA R16.0 V1 Users Instructions

Table of Contents Introduction Installation Instructions Problem Setup • • • • • •

Engineering Data Geometry Body Interactions Meshing Initial Conditions Boundary Conditions

• • • • • •

Stress Strain Global Data Nodal Output Body Data Animation

• • • • • •

Documentation Changes in R15.0.7 Changes in R16.0 Tips Technical Support License Requirements

Analysis Settings Result Processing

LS-DYNA Keywords Additional Information

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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).

Images courtesy of CADFEM GmBH © 2015 ANSYS, Inc.

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. 3/53


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 postprocessing 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 LSDYNA. 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.

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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.

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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.

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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.

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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

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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 LSDYNA are shown in Engineering Data for Workbench LS-DYNA.

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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

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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.

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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.

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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.

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Problem Setup: IC

Initial Conditions can be assigned to parts by inserting them in the ANSYS LSDYNA branch or from the Supports dropdown menu.

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Problem Setup: BC Boundary Conditions (Supports, Loads and Acceleration) can be assigned to parts by inserting them in the ANSYS LSDYNA branch or from the LS-DYNA Environment dropdown menus.

Specifications for Rigid Body and Rigid wall constraints are available from the Constraints dropdown menu

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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

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Results: Nodal data Time history plots at result trackers are shown with Nodal Output. They can show :

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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 .

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Results: Global Data 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.

• • • •

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Results: Global Data 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.

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Results: Global Data 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.

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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.

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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.

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Animations can be generated with one click

select 10 Sec for animation length and show all data

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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.

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$# LS-DYNA Keyword file *KEYWORD *DATABASE_FORMAT 0 0 *CONTROL_TERMINATION 0.0007 10000000 0.001 *CONTROL_TIMESTEP 0 0.9 0 0 0 0 0 *CONTROL_CONTACT 0 0 1 1 0 0 0 0 0 0 0 0 2 1 0 1 0 0 0 0 1 0 0 0 *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 *CONTROL_SHELL 20 1 -1 4 0 0 0 0 0 0 2 *CONTROL_OUTPUT 1 0 0 0 0 0 0 0 *CONTROL_PARALLEL 0 0 1 0 *CONTROL_SOLUTION 0 0 0 0 32/53

1000 100000 0

0

1 0 0 0 0 1

0

1

0 0 0 1 0

0

0

2 0 0 0.5 0

0

0 0

0

0

0

2 0

1 1

1 1

1 0

0 0

0

0

0


LS-DYNA Keywords Generated - Materials

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LS-DYNA Keywords Generated - Model • 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

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LS-DYNA Keywords Generated – Initial and Boundary Conditions • 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.

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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 LSDYNA 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

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LS-DYNA Keywords Supported The list of supported keyword is listed and explained in a separate document: ANSYS Workbench LS-DYNA R16 Supported Keywords.pdf

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Additional Information: Documentation

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 © 2015 ANSYS, Inc.

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Additional Information: Training & Tutorials

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

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Additional Information: Terminology To be added: translation from ANSY Mechanical to LS-DYNA terminology

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Additional Information: Changes in R15.0.7 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

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Additional Information: Changes in R16.0 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

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Additional Information: Tips 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

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Additional Information: Tips – Caution! Do not modify the .k file within Workbench

• 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.

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Additional Information: Tips – Caution! LS-DYNA cannot use pyramid elements

• Check the mesh statistics if you

suspect that they may have been generated by the mesher.

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Additional Information: Tips – Caution! Workbench LS-DYNA with design points

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.

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Additional Information: Tips Cancel the Rigid Body Force To cancel the Rigid Body Force input via the “Tabular Data” click “cancel” rather than the x in the upper right corner.

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Additional Information: Tips Open Solver Files Directory

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Additional Information: Tips Generate .rst file

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

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.

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Additional Information: Tips Commands snippets can be used

• 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

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Additional Information: Tips With the R16.0 license server old licensing preferences can block the usage of Workbench LS-DYNA

• 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

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Additional Information: License Requirement

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-DYNA ANSYS Mechanical LS-DYNA ANSYS Multiphysics LS-DYNA

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Technical Support 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 724.514.3600 Email: [email protected] For existing technical support service requests, please reference the service request number when contacting ANSYS Technical Support.

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