Intro to Autodyn

Chapter 1 Introduction to AUTODYN

ANSYS AUTODYN

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Welcome!

Training Manual

• 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 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Course Materials

Training Manual

•

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”.

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

A. About ANSYS, Inc.

Training Manual

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

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Course Overview

Training Manual

• 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

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

ANSYS® AUTODYN® - Focus

Training Manual

• 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

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

ANSYS®AUTODYN® Solutions

Training Manual

Coupling Lagrange (FE) Solvers (Solids, shells & beams) Structural Response Complex Materials

Interactions

Euler (CFD) Solvers (Multi-material, Blast) Solid / Gas / Fluid Flow Blast Waves

Solid Impact FSI (Deforming Structures)

Bonding / Contact

Combined Blast & Impact Loading

Coupling

Mesh Free Solver ALE Solver

Hypervelocity Impact

Fluid-Structure Interaction with Strong Structures

Brittle Material Fracture / Fragmentation

Bonding / Contact ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

ANSYS®AUTODYN® User Interface Training Manual

Context-sensitive Help Linked to extensive and readable HTML Manuals

Set Up Model Interactively

Create and View Animations

Open Architecture

View Results

User Subroutines User Variables

Advanced FE & CFD Visualization Time Histories

Set Up Parallel Processing

Run Analysis Interactively

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

LS-DYNA Nastran ICEM-CFD

Access Extensive Material Library

GIF, MPEG, AVI, GFA

Visually Refreshed Stop / Start at any time Interrogate progress

Import Models

Load / Save Model Startup Files Restart Files

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Host Configuration Decomposition Load Balancing

February 27, 2009 Inventory #002665

Introduction to AUTODYN

ANSYS® AUTODYN® - Applications

Training Manual

• Typical Applications – Impact – Ballistic Protection • Low => Hypervelocity

– Energetic Systems – Blast Propagation – Blast Effects on Structures – Materials Research

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Material Models

Training Manual

• AUTODYN has an expanded / advanced selection of material models Equations of State

Strength Models

(Hydrodynamic)

(Plasticity)

Failure Models

Models Also Available in Explicit Dynamics (ANSYS) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Discretization

Training Manual

• 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 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Lagrange Solvers

Training Manual

• Lagrange Solvers use mesh-based Lagrangian methods

Grid inside materials

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

No grid required for exterior space

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Euler Solvers

Training Manual

• Euler Solvers use mesh-based Eulerian methods

External space needs to be modelled (Void cells)

Grid is fixed in space and material flows through it

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

ALE Solver

Training Manual

• The ALE (Arbitrary Lagrange Euler) Solvers uses a meshbased hybrid Lagrangian/Eulerian method Predominantly Eulerian flow

Predominantly Lagrangian deformation ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Mesh-free Solver

Training Manual

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

No particles required for exterior space

Geometry represented as particles

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Comparison of Solvers

Lagrange ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

Training Manual

Euler

ALE 1-16

SPH February 27, 2009 Inventory #002665

Introduction to AUTODYN

Symmetries – 2D

Training Manual

Planar Symmetry (Єzz = 0)

Generated Mesh

Axial Symmetry ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Symmetries – 3D

Training Manual

X symmetry

No symmetry

X & Y symmetry ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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X, Y & Z symmetry February 27, 2009 Inventory #002665

Introduction to AUTODYN

AUTODYN Parts

Training Manual

• 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 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

AUTODYN Parts

Training Manual

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) ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Combining Solvers

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)

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Comparison of Contact and Coupling Interactions

Training Manual

Euler/Lagrange Coupling

Lagrange/Lagrange Contact

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Using ANSYS® AUTODYN Standalone

Training Manual

• Start AUTODYN using the AUTODYN Executable – “C:\Program Files\ANSYS Inc\v120\AISOL\AUTODYN\intel\autodyn.exe” • Uses AUTODYN project data base / file system

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Using ANSYS® AUTODYN in Workbench®

Training Manual

• 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

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Using ANSYS® AUTODYN in Workbench®

Training Manual

• Workbench Bodies are imported as AUTODYN Parts • Workbench Parts are imported as AUTODYN Components Workbench

AUTODYN Component

Bodies

Part Parts

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Using ANSYS® AUTODYN in Workbench®

Training Manual

• 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

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Using ANSYS® AUTODYN in Workbench®

Training Manual

• 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

– Cannot be solved in Explicit Dynamics (ANSYS) • Mesh-free solver is only available in AUTODYN

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

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February 27, 2009 Inventory #002665

Introduction to AUTODYN

Using ANSYS® AUTODYN in Workbench®

Training Manual

• 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 – Cannot be solved in Explicit Dynamics (ANSYS) • Explosive material models are only available in AUTODYN

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

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February 27, 2009 Inventory #002665