ls-dyna实例.pdf

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Table of Contents

Introduction

*AIRBAG

Airbag Deploys into Cylinder

*BOUNDARY_PRESCRIBED_MOTION

Blow Molding

*CONSTRAINED

Two Plates Connected With Butt Welds

Sliding Blocks with Planar Joint

Hinged Shell with Stop Angle (Revolute Joint)

Linearly Constrained Plate

Impulsively Loaded Cap with Shells and Solids

Spot Weld Secures Two Plates

*CONTACT

Shell Rebounds from Plate Using Five Contact Types

Projectile Penetrates Plate

Rigid Sphere Impacts a Plate at High Speed

Corrugated Sheet Contacts Edges

Discrete Nodes Tied to a Surface

*CONTACT-ENTITY

Rigid Sphere Impacts Plate

*CONTROL

CONTACT: Hemispherical Punch

DAMPING: Cantilever Beam

ENERGY: Bar Impact

SHELL: Hemispherical Load

SHELL: Twisted Cantilever Beam

TIMESTEP: Billet Upset

*CONTROL-ADAPTIVE

Deep Drawing with Adaptivity

Square Crush Tube with Adaptivity

Cylinder Undergoing Deformation with Adaptivity

*DAMPING_GLOBAL

Tire Bounces on the Ground and Damps Out

*DEFORMABLE_TO_RIGID

Interaction of Pendulums

*INTEGRATION_SHELL

Cantilever Beam with Lobotto Integration

*INTERFACE_COMPONENT

An Interface File Controls the Response of a Cube

*LOAD_BODY

GENERALIZED: Rotating Elements

Z: Tire Under Gravity Loading Bounces on a Rigid Wall

*MAT

Frazer-Nash Single Element

Piecewise Linear Plasticity Fragmenting Plate

Rigid Sliding Block in Local Coordinate System

Soil and Foam Single Element

Belted Dummy with Springs

Rectangular Cup Drawing

*RIGIDWALL

Rigid Wall Sphere Impacts a Plate

Rotating Shell Strikes Rigid Wall

Cube Rebounding

Symmetric Crush Tube

*SECTION

SHELL: Fuse Plate in Tension Exhibits Hourglassing

SOLID: Breaking Post Exhibits Hourglassing

Acknowledgments

References

Index

LS-DYNA EXAMPLES MANUAL March 1998 Copyright ª 1989-1998 LIVERMORE SOFTWARE TECHNOLOGY CORPORATION All Rights Reserved Written By John D. Reid, Ph.D. Department of Mechanical Engineering University of Nebraska-Lincoln

Mailing Address: Livermore Software Technology Coporation 2876 Waverley Way Livermore, California 94550-1740 Support Address: Livermore Software Technology Corporation 97 Rickenbacker Circle Livermore, California 94550-7612 FAX: 925-449-2507 TEL: 925-449-2500 EMAIL: sales@lstc.com Copyright ª 1989-1998 by Livermore Software Technology Corporation All Rights Reserved

TABLE OF CONTENTS TABLE OF CONTENTS INTRODUCTION ...........................................................................................................................................1 *AIRBAG........................................................................................................................................................3 Airbag Deploys into Cylinder...............................................................................................................3 *BOUNDARY_PRESCRIBED_MOTION...................................................................................................11 Blow Molding .....................................................................................................................................11 *CONSTRAINED .........................................................................................................................................19 Two Plates Connected With Butt Welds.............................................................................................19 Sliding Blocks With Planar Joint ........................................................................................................27 Hinged Shell With Stop Angle (Revolute Joint).................................................................................35 Linearly Constrained Plate..................................................................................................................41 Impulsively Loaded Cap With Shells and Solids................................................................................47 Spot Weld Secures Two Plates ...........................................................................................................55 *CONTACT ..................................................................................................................................................61 Shell Rebounds From Plate Using Five Contact Types ......................................................................61 Projectile Penetrates Plate...................................................................................................................69 Rigid Sphere Impacts a Plate at High Speed.......................................................................................75 Corrugated Sheet Contacts Edges.......................................................................................................83 Discrete Nodes Tied to a Surface........................................................................................................89 *CONTACT_ENTITY..................................................................................................................................95 Rigid Sphere Impacts Plate.................................................................................................................95 *CONTROL ................................................................................................................................................101 CONTACT: Hemispherical Punch ...................................................................................................101 DAMPING: Cantilever Beam...........................................................................................................109 ENERGY: Bar Impact ......................................................................................................................117 SHELL: Hemispherical Load ...........................................................................................................123 SHELL: Twisted Cantilever Beam ...................................................................................................129 TIMESTEP: Billet Upset ..................................................................................................................135 *CONTROL_ADAPTIVE ..........................................................................................................................141 Deep Drawing With Adaptivity ........................................................................................................141 Square Crush Tube With Adaptivity.................................................................................................149 Cylinder Undergoing Deformation With Adaptivity ........................................................................155 iii

TABLE OF CONTENTS *DAMPING_GLOBAL................................................................................................................ .............. 161 Tire Bounces on the Ground and Damps Out .................................................................................. 161 *DEFORMABLE_TO_RIGID ................................................................................................................... 167 Interaction of Pendulums ................................................................................................................. 167 *INTEGRATION_SHELL ......................................................................................................................... 175 Cantilever Beam With Lobotto Integration...................................................................................... 175 *INTERFACE_COMPONENT.................................................................................................................. 181 An Interface File Controls the Response of a Cube ......................................................................... 181 *LOAD_BODY .......................................................................................................................................... 191 GENERALIZED: Rotating Elements ............................................................................................. 191 Z: Tire Under Gravity Loading Bounces on a Rigid Wall .............................................................. 197 *MAT ......................................................................................................................................................... 203 Frazer-Nash Single Element............................................................................................................. 203 Piecewise Linear Plasticity Fragmenting Plate ................................................................................ 209 Rigid Sliding Block in Local Coordinate System ............................................................................ 215 Soil and Foam Single Element ......................................................................................................... 221 Belted Dummy With Springs ........................................................................................................... 227 Rectangular Cup Drawing................................................................................................................ 239 *RIGIDWALL............................................................................................................................................ 247 Rigid Wall Sphere Impacts a Plate................................................................................................... 247 Rotating Shell Strikes Rigid Wall .................................................................................................... 253 Cube Rebounding............................................................................................................................. 259 Symmetric Crush Tube .................................................................................................................... 265 *SECTION.................................................................................................................................................. 271 SHELL: Fuse Plate in Tension Exhibits Hourglassing .................................................................... 271 SOLID: Breaking Post Exhibits Hourglassing ................................................................................. 277 ACKNOWLEDGMENTS .......................................................................................................................... 285 REFERENCES ........................................................................................................................................... 287 INDEX........................................................................................................................................................ 289 iv

INTRODUCTION Introduction This is an assembly of example problems provided by a number of resources. The resources and histories are documented in the acknowledgment and reference sections. Users are encouraged to submit examples which will facilitate the education of LS-DYNA users. October 1997 Modifications • All examples were documented and re-organized for clarity. • All examples ran successfully using LS-DYNA version 940 on a Sun SPARC 10 workstation. • Many examples required changes to make them work. Descriptions of the examples were updated to reflect the examples as they are as of this date. • All graphics in this edition have been replaced with newly created results using LS-TAURUS on the Sun SPARC 10 workstation. • Many new examples were added to the manual. • The examples are now strictly in keyword format. References to ingrid and structured format have been removed for they are no longer consistent with these examples. • Naming Conventions for the examples have been changed as described below. Naming Convention The naming convention for the input decks is: keyword.description.k Keyword defines the major keyword used within the example. Description defines either the action or the physical content of the problem. The “.k” on the end of the filename signifies that the file is a keyword format LS-DYNA input file. 1

INTRODUCTION 2

*AIRBAG_SIMPLE_AIRBAG_MODEL Airbag Deploys into Cylinder LS-DYNA Manual Section: *AIRBAG_SIMPLE_AIRBAG_MODEL Additional Sections: *CONTACT_NODES_TO_SURFACE *RIGIDWALL_PLANAR Example: Airbag Deploys into Cylinder Filename: airbag.deploy.k Description: An airbag inflates below a rigid cylinder, causing the cylinder to fly into the air. Model: The volume pressure relationships is defined by the Simple Airbag Model for control volumes. The bag inflates through the flow of mass into the bag. Input: The control volume defines the thermodynamic relationship for the gas in terms of parameters such as heat capacity, gas incoming mass, and outgoing mass (*AIRBAG_SIMPLE_AIRBAG_MODEL). A rigidwall is used below the airbag to act as ground (*RIGIDWALL_PLANAR). A ground is displayed using rigid shell elements, but is used only for visualization purposes. The contact between the airbag and the cylinder is automatically generated by part id (*CONTACT_NODES_TO_SURFACE). temperature, Results: The plots show the bag expanding. The ASCII file abstat contains information on the computed pressure, volume, mass flow and internal energy of the control volume (*DATABASE_ABSTAT). 3

*AIRBAG_SIMPLE_AIRBAG_MODEL Airbag Deploys into Cylinder List of LS-DYNA input deck: *KEYWORD *TITLE Airbag and Structure $ $ LSTC Example $ $ Last Modified: August 29, 1997 $ $ Airbag with a cylinder on top, deploys and pushes the cylinder into the air. $ $ Airbag is approximately 19 x 25 inches, with 0.015 in thickness $ $ $ Units: lbf-s^2/in, in, s, lbf, psi, lbf-in $ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $ $$$$ Control Ouput $ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $ $...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8 $ *CONTROL_TERMINATION $ endtim endcyc dtmin endneg endmas 3.000E-02 $ *CONTROL_ENERGY $ hgen rwen slnten rylen 2 2 2 $ *CONTROL_OUTPUT $ npopt neecho nrefup iaccop opifs ipnint ikedit 1 3 $ *DATABASE_BINARY_D3PLOT $ dt lcdt 5.000E-04 $ *DATABASE_EXTENT_BINARY $ neiph neips maxint strflg sigflg epsflg rltflg engflg $ cmpflg ieverp beamip 1 $ *DATABASE_BINARY_D3THDT $ dt lcdt 999999 $ $ *DATABASE_ABSTAT $ dt 2.000E-04 $ *DATABASE_GLSTAT $ dt 2.000E-04 $ $ *DATABASE_MATSUM $ dt 2.000E-04 4

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