ANSYS AUTODYN

68 Pages·2007·2.42 MB·English

® ®
ANSYS AUTODYN

Explicit Software for Nonlinear Dynamics

ANSYS® AUTODYN® version 11.0

What’s New?
i
AUTODYN® version 11.0, What’s New?

TABLE OF CONTENTS

1. Introduction
2. ANSYS AUTODYN and ANSYS Workbench
2.1. ANSYS AUTODYN
2.2. Meshing and ANSYS AUTODYN
2.3. Advanced Meshing and ANSYS AUTODYN
2.4. FEModeler and ANSYS AUTODYN
3. Solver Enhancements
3.1. Trajectory Contact (BETA Option)
3.2. Group Contact
3.3. Automatic Mass Scaling
3.4. New Multi-material Pressure Equilibrium Option
3.5. Enhancements to the ANP Tetrahedral Element
3.6. HP-MPI for Parallel Processing on Linux
4. Material Modelling Enhancements
4.1. Hyperelasticity
4.1.1. Introduction to Hyperelastic Material Models
4.1.2. Neo-Hookean
4.1.3. Mooney-Rivlin
4.1.3.1. 2-Parameter Mooney-Rivlin Model
4.1.3.2. 3-Parameter Mooney-Rivlin Model
4.1.3.3. 5-Parameter Mooney-Rivlin Model
4.1.3.4. 9-Parameter Mooney-Rivlin Model
4.1.4. Yeoh
4.1.4.1. Yeoh 1st order
4.1.4.2. Yeoh 2nd order
4.1.4.3. Yeoh 3rd order
4.1.5. Ogden
4.1.5.1. Ogden 1st Order
4.1.5.2. Ogden 2nd Order
4.1.5.3. Ogden 3rd Order
4.1.6. Arruda-Boyce
4.1.7. Material Data and Examples
4.2. Compaction model enhancements
4.3. New Powder Burn Model
4.3.1. Theory
4.3.2. Material Data Input
4.3.3. Example
4.4. JWL, Miller extension
4.5. Time Dependant Energy Deposition Extension to JWL Equation of
State
4.6. Lee-Tarver Enhancement
4.6.1. Improved Stability for Multi-material Euler Applications
4.6.2. Improved Post-burn behavior for all Solvers
5. Pre- and Post- Processing
5.1. Improved Memory Management During Pre-processing
5.2. Results Files
5.3. Improved Compression for Save Files
5.4. Unstructured Parts to initialize 3D Multi-material Euler
1
AUTODYN® version 11.0, What’s New?

5.5. Unstructured Parts to initialize SPH
5.6. Interactive Selection of Parts
5.7. Highlight Parts
5.8. Interactive Selection of Gauges
5.9. Group Operations
5.9.1. Delete Elements
5.9.2. Split Nodes
5.10. Automatic parallel decomposition of Euler-FCT parts
6. Extended Unit Systems
6.1. US Customary Units
6.2. Micron Unit System
7. Supported Operating Systems and Compilers
8. Installation
8.1. Windows 32-bit
8.2. Windows 64-bit (Limitations)
8.3. Linux Installation
9. Licensing

2
AUTODYN® version 11.0, What’s New?

1. INTRODUCTION

ANSYS AUTODYN release 11.0 is the first release of the ANSYS AUTODYN
software within the ANSYS Workbench framework. ANSYS Workbench brings
many new possibilities to the ANSYS AUTODYN user in terms of CAD
geometry import, complex geometry generation, meshing and ease of use. To
complement the significantly enhanced model generation capabilities, a range
of new solver, material modeling and post-processing features enable larger
simulations to be solved in a faster time.

The main new features of the ANSYS AUTODYN 11.0 release are

• ANSYS AUTODYN and ANSYS Workbench
o Meshing (for each ANSYS AUTODYN-3D licensee)
(cid:131) Robust and Easy to use meshing tool
(cid:131) 3D Tetrahedral, Hexahedral, Quad and Tri meshing
(cid:131) Geometry import capabilities from DesignModeler for
an extensive list of third party CAD systems
o FEModeler (for each ANSYS AUTODYN-3D licensee)
(cid:131) Links to Finite Element Meshes
• ANSYS CDWRITE, ABAQUS, NASTRAN
o Design Modeler (Optional)
(cid:131) Geometry editor for existing CAD models
(cid:131) Parametric feature-based solid modeler
o Advanced Meshing (Optional)
(cid:131) Hexahedral meshing for complex geometries
(cid:131) Advanced mesh controls

• Solvers
o New trajectory based 3D contact algorithm
(cid:131) Increased flexibility (no external gap)
(cid:131) Significant efficiency improvements
o Contact selection by group
o Extended material modeling capabilities for ANP-Tet
o Automatic mass scaling
o New pressure equilibrium option for Euler

• Materials
o Hyperelasticity
o New Powder Burn model
o Extended Granular strength model
o JWL-Miller
o Simple thermobaric representation

• Pre- and Post-processing
o Improved memory management for pre- and post-processing
o Results files for more efficient post-processing
o Better compression of binary data files
o Extended unit systems
3
AUTODYN® version 11.0, What’s New?

o Interactive selection of Parts
o Interactive selection of Gauges
o Multi-material Euler Fill using Unstructured Parts
o Initialize SPH regions using Unstructured Parts

These and other new features are now described in detail.

2. ANSYS AUTODYN AND ANSYS WORKBENCH

The ANSYS AUTODYN 11.0 software is supplied as an integral part of the
ANSYS Workbench environment.

The ANSYS Workbench, together with the Workbench projects and tabs,
provides a unified working environment for developing and managing a variety
of CAE information and makes it easier for you to set up and work with data at
a high level.

Typical tasks you can perform in Workbench are:

• Creating models using DesignModeler or importing models from a
variety of CAD systems.
• Generating a numerical mesh suitable for a variety of FE and CFD
methods using Meshing or Advanced Meshing
• Performing implicit finite element analyses using Simulation for
structural, thermal, and electromagnetic simulations.
• Performing explicit transient nonlinear dynamics simulations of solids,
fluids, gases, and their interaction using ANSYS AUTODYN
• Optimizing designs using DesignXplorer or DesignXplorer VT, and
implementing a chosen design back into the original model.

Additionally, Workbench includes the following modules:

• Engineering Data: A repository of material data for use by a selection
of other Workbench applications.
• FE Modeler: Uses input from NASTRAN, ABAQUS, or Simulation, and
allows navigating and visualizing of the finite element model for
downstream analysis in ANSYS or ANSYS AUTODYN.
• Other modules for use in specialized applications such as
Computational Fluid Dynamics (CFD) simulations.

With the ANSYS AUTODYN 11.0 release, four typical work flows are available
to the user. These are described below.

2.1. ANSYS AUTODYN

4
AUTODYN® version 11.0, What’s New?

ANSYS AUTODYN can be launched from the start of the Workbench (Start,
Programs, ANSYS 11.0, ANSYS Workbench).

ANSYS AUTODYN Icon on start page of ANSYS Workbench

The ANSYS AUTODYN application will appear inside the Workbench. The
integrated capabilities of ANSYS AUTODYN can be used to setup models,
run simulations, post-process results.

2.2. MESHING AND ANSYS AUTODYN

The new Meshing application in the ANSYS Workbench is available to
ANSYS AUTODYN-3D licensees. This application provides robust, powerful
and easy to use mesh generation capabilities. This includes automated
meshing methods for
• Hexahedral elements (sweepable geometries)
• Tetrahedral meshing (patch based and patch independent)
• Quad and tri shell elements
• Beam elements

Additionally controls are available to refine the mesh in regions of interest or
ignore small geometric features that do not need to be represented in the
simulation.

5
AUTODYN® version 11.0, What’s New?

Patch Independent
Tet Mesh
Swept Hex Mesh

Example mesh produced using Meshing

The meshing application also allows import of geometry from a wide range of
sources
• ANSYS DesignModeler
DesignModeler is a parametric feature-based solid modeler designed
so that you can intuitively and quickly begin drawing 2D sketches,
modeling 3D parts, or uploading 3D CAD models for engineering
analysis pre-processing.

If you have never used a parametric solid modeler, you will find
DesignModeler easy to learn and use. If you are an experienced user
in parametric modeling, DesignModeler offers you the functionality and
power you need to convert 2D sketches of lines, arcs, and splines into
3D models.

This is the recommended application for geometry generation and
preparation for ANSYS AUTODYN simulations.

• 3D CAD models
3D CAD models can be loaded directly into the Meshing application.
Providing the geometry is suitable and clean, the numerical mesh can
be generated.

• FEModeler
FEModeler works with the standard finite element representation used
inside ANSYS Workbench. FE Modeler supports robust data transfer
from NASTRAN, ABAQUS, or ANSYS. FEModeler can be used to:
o Import an FE model from NASTRAN bulk data files, ABAQUS
input files or ANSYS CDB Files. Alternatively FE information can
be imported from Simulation.
6
AUTODYN® version 11.0, What’s New?

o Navigate and visualize the data contained in the model.
o Create named components based on element selections
o Convert FE meshes into geometric bodies

FEModeler is available to all ANSYS AUTODYN-3D licensees

Typical workflows for using ANSYS AUTODYN and the Meshing application
inside Workbench are shown in the figure below.
7
AUTODYN® version 11.0, What’s New?

DesignModeler

CAD

FEModeler

Typical workflows using ANSYS AUTODYN and Meshing inside ANSYS Workbench

The project page of ANSYS workbench is used to manage the above
workflow and allows transparent communication of information from one
application to another.

Once you have created or opened an existing Workbench project from the
Start Page, a Project Page replaces the Start Page as your project
management tool, providing useful options as you move through the various
Workbench modules.

8
AUTODYN® version 11.0, What’s New?

Example project page navigation for ANSYS AUTODYN and Meshing

In the above example, a geometry has been generated in the DesignModeler
application. This geometry has then been transferred to the Meshing
application. Selecting the Meshing application on the project page exposes
the ANSYS AUTODYN tasks:
• Start ANSYS AUTODYN
Selecting this task will start ANSYS AUTODYN. No links to other
applications will be made.
• Proceed to ANSYS AUTODYN1
ANSYS AUTODYN will start and automatically load the FE model from
the selected meshing task on the project page. A persistent link
between the ANSYS AUTODYN model and the model in the Meshing
application is created. This allows changes to geometry and mesh to
feed directly into the ANSYS AUTODYN model with minimal user
intervention.

Using “Proceed to ANSYS AUTODYN” automatically transfers the following
data to the ANSYS AUTODYN application
• Mesh
o Nodes, elements, connectivity
o Bodies defined in the Meshing application will be imported as
ANSYS AUTODYN Parts. Body Names will be transferred to the
Part Names. Duplicate names will be appended with an
identifying number
o An ANSYS AUTODYN component will also be generated for
each Part defined in the Meshing application. If a multi-body
Part, the component will include all associated bodies.
• Material assignments

1 Note this option is not currently available on Windows 64 bit installation. To transfer the
mesh to ANSYS AUTODYN use New FE Model, Target System Nastran, Generate Data.
From the AUTODYN applet use Import, MSC.Nastran.
9