intro to autodyn

1-1ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.

February 27, 2009Inventory #002665

Chapter 1

Introduction to AUTODYN

ANSYS AUTODYN




Training ManualWelcome!• Welcome to the ANSYS AUTODYN training course!

• This training course is intended for all new or occasional ANSYS AUTODYN users, regardless of the CAD software used

• Course Objectives:• Introduction to ANSYS AUTODYN• Detailed understanding of how to set up, solve and post-process

AUTODYN analyses• Detailed understanding of how ANSYS Workbench (in particular,

Explicit Dynamics) and ANSYS AUTODYN can be used for combined solutions

• Training Courses are also available covering the detailed use of other Workbench modules (e.g. DesignModeler, Meshing, Advanced meshing, etc.)

• The ANSYS Explicit Dynamics Training Course is a pre-requisite for this course




Training ManualCourse Materials

• The Training Manual you have is an exact copy of the slides.

• Workshop descriptions and instructions are included in the Workshop Supplement.

• Copies of the workshop files are available on the ANSYS Customer Portal (www.ansys.com).

• Advanced training courses are available on specific topics. Schedule available on the ANSYS web page http://www.ansys.com/ under “Solutions> Services and Support> Training Services”.




Training ManualA. About ANSYS, Inc.ANSYS, Inc. • Developer of ANSYS family of products• Global Headquarters in Canonsburg, PA - USA (south of Pittsburgh)

– Development and sales offices in U.S. and around the world– Publicly traded on NASDAQ stock exchange under “ANSS”– For additional company information as well as descriptions and schedules for

other training courses visit www.ansys.com




Training ManualCourse Overview• Chapter 1: Introduction to ANSYS AUTODYN• Chapter 2: AUTODYN User Interface• Chapter 3: AUTODYN Basics

– Workshop 1: 2D Fragment Impact (Cylinder Impact)

• Chapter 4: AUTODYN and Workbench– Explicit Dynamics– 2D Processing– Pre-Stressing– Workshop 2: 2D Fragment Impact (Workshop 1 model set up in Explicit Dynamics)– Workshop 3: Projectile Impacting Pre-stressed Container

• Chapter 5: Multi-material Euler Solver– Workshop 4: Jet Impact

• Chapter 6: Euler Blast (Ideal Gas) Solver– Workshop 5: Urban Blast

• Chapter 7: ALE Solver• Chapter 8: Mesh Free (SPH) Solver

– Workshop 6: Bird Strike

• Chapter 9: Material Models (Not available in Explicit Dynamics)• Chapter 10: Euler-Lagrange Interactions

– Workshop 7: Explosive Demolition – Workshop 8: Ship Blast




Training ManualANSYS® AUTODYN® - Focus

• Transient dynamic wave propagation– Gases, Liquids, Solids + their Interaction (FSI)

• Non-linear– Material behaviour– Structural behaviour– Contact/Interaction– Fluid Structure Interaction

• Large/extreme deformation

• Large/extreme strain and fragmentation

• Robust Code / Established Algorithms




Training ManualANSYS®AUTODYN® Solutions

Lagrange (FE) Solvers(Solids, shells & beams)

Structural ResponseComplex Materials

Euler (CFD) Solvers (Multi-material, Blast)

Solid / Gas / Fluid FlowBlast WavesInteractions

Solid Impact

FSI (Deforming Structures)

Combined Blast & Impact Loading

Mesh Free Solver

Hypervelocity Impact

Brittle Material Fracture /Fragmentation

ALE Solver

Fluid-Structure Interactionwith Strong Structures

Coupling

Bonding / Contact

Bonding / Contact

Coupling




Training ManualANSYS®AUTODYN® User Interface

Create and ViewAnimations

GIF, MPEG, AVI, GFA

Set Up ModelInteractively

Import ModelsLS-DYNA

NastranICEM-CFD

Access Extensive Material Library

Context-sensitive HelpLinked to extensive

and readable HTML Manuals

Open ArchitectureUser SubroutinesUser Variables

Set Up Parallel Processing

Host ConfigurationDecompositionLoad Balancing

Load / Save ModelStartup FilesRestart Files

Run Analysis InteractivelyVisually Refreshed

Stop / Start at any timeInterrogate progress

View ResultsAdvanced FE & CFD Visualization

Time Histories




Training ManualANSYS® AUTODYN® - Applications

• Typical Applications

– Impact

– Ballistic Protection• Low => Hypervelocity

– Energetic Systems

– Blast Propagation

– Blast Effects on Structures

– Materials Research




Training ManualMaterial Models• AUTODYN has an expanded / advanced selection of material models

Equations of State Strength Models Failure Models

(Hydrodynamic) (Plasticity)

Models Also Available in Explicit Dynamics (ANSYS)




Training ManualDiscretization• AUTODYN solutions are discretized in time and space

• Spatial Discretization

– Components are meshed into a (large) number of smaller elements (cells) or particles

• Structured meshes (2D and 3D)

• Unstructured meshes (3D)

• Mesh free particles (2D and 3D)

• Temporal Discretization

– Time is split into a (large) number of small time steps (cycles)

• Except for Euler sub-cycling, the time steps are the same for all Solvers

• The time steps must satisfy stability criteria




Training ManualLagrange Solvers

Grid inside materials No grid required for exterior

space

• Lagrange Solvers use mesh-based Lagrangian methods




Training ManualEuler Solvers

Grid is fixed in space and

material flows through it

External space needs to be

modelled(Void cells)

• Euler Solvers use mesh-based Eulerian methods




Training ManualALE Solver

• The ALE (Arbitrary Lagrange Euler) Solvers uses a mesh-based hybrid Lagrangian/Eulerian method

Predominantly Lagrangian deformation

Predominantly Eulerian flow




Training ManualMesh-free Solver

Geometry represented as particles

No particles required for

exterior space

• The Mesh-free Solver uses the particle-based Smooth Particle Hydrodynamics (SPH) method




Training ManualComparison of Solvers

Lagrange Euler ALE SPH




Training ManualSymmetries – 2D

Generated Mesh

Axial Symmetry

Planar Symmetry (Єzz = 0)




Training ManualSymmetries – 3D

No symmetry

X, Y & Z symmetryX & Y symmetry

X symmetry




Training ManualAUTODYN Parts• Structured Parts

– Structured group of elements of same element (solver) type

• 2D– Quadrilateral solid– Shell

• 3D– Hexahedral solid– Quadrilateral Shell– Beam

– Implicit connectivity using a structured (I,J,(K)) grid

– Generated in AUTODYN

• Lagrange (Solid, Shell, Beam), ALE & Euler




Training ManualAUTODYN Parts Unstructured Parts

– Unstructured group of elements of compatible element types

• 2D– Quad / Tri solid– Line shell

• 3D– Hexahedral / Tetrahedral solid– Quad / Tri shell– Line Beam

– Uses node/element connectivity tables

– Imported (e.g. from Workbench)• Lagrange (Solid, Shell, Beam)




Training Manual

• The “best” Solver can be selected for each region of the simulation

– Each AUTODYN simulation can have multiple Parts

• Each Part is assigned a solver

• The different Parts can interact with each other through

– Bonding (joins)

– Contact (Lagrange-Lagrange Interactions)

– Coupling (Euler-Lagrange Interactions)

Combining Solvers




Training Manual

Lagrange/LagrangeContact

Euler/LagrangeCoupling

Comparison of Contact and Coupling Interactions




Training ManualUsing ANSYS® AUTODYN Standalone

• Start AUTODYN using the AUTODYN Executable– “C:\Program Files\ANSYS Inc\v120\AISOL\AUTODYN\intel\autodyn.exe”

• Uses AUTODYN project data base / file system




Training ManualUsing ANSYS® AUTODYN in Workbench®

• Analysis Systems

– Setup Lagrange (structural Parts in Explicit Dynamics (ANSYS)

• Interfaces to CAD• ANSYS Geometry tools• ANSYS Meshing tools

– Link to AUTODYN• Add Euler Parts• Add Mesh-free Parts• Use advanced material models• Solve

• Component Systems

– Setup and Solve standalone in AUTODYN

• Uses Workbench Project data base / file system




Training Manual

• Workbench Bodies are imported as AUTODYN Parts

• Workbench Parts are imported as AUTODYN Components

Workbench AUTODYN

Bodies

Part

Parts

Component

Using ANSYS® AUTODYN in Workbench®





• Example: Mine Blast

– Structural (Lagrange) Parts used for the vehicle and the ground

– Euler Part used for the air

– Cannot be solved in Explicit Dynamics (ANSYS)

• Euler solvers are only available in AUTODYN

• Material model for air is only available in AUTODYN





• Example: Bird Strike

– Structural (Lagrange) Parts used for the wing

– Mesh-free (SPH) particles used for the bird (ovoid)

• Lagrange Part “filled” with SPH particles


• Mesh-free solver is only available in AUTODYN





• Example: Metal cylinder with an explosive Core

– Structural (Lagrange) Parts used for the metal cylinder and Explosive

– Body interaction with no friction specified between explosive and cylinder


• Explosive material models are only available in AUTODYN

intro to autodyn

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