ANSYS Contact Technology Guide

ANSYS Contact Technology Guide

ANSYS Release 9.0

002114 November 2004

ANSYS, Inc. is a UL registered ISO 9001: 2000 Company.

ANSYS Contact Technology Guide

ANSYS Release 9.0

ANSYS, Inc. Southpointe 275 Technology Drive Canonsburg, PA 15317 ansysinfo@ (T) 724-746-3304 (F) 724-514-9494

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Table of Contents

1. Contact Overview ................................................................................................................................ 1?1 1.1. General Contact Classification ....................................................................................................... 1?1 1.2. ANSYS Contact Capabilities ........................................................................................................... 1?1 1.2.1. Surface-to-Surface Contact Elements .................................................................................... 1?2 1.2.2. Node-to-Surface Contact Elements ....................................................................................... 1?3 1.2.3. Node-to-Node Contact Elements .......................................................................................... 1?3

2. GUI Aids for Contact Analyses ............................................................................................................. 2?1 2.1. The Contact Manager ................................................................................................................... 2?1 2.2. The Contact Wizard ...................................................................................................................... 2?2 2.3. Managing Contact Pairs ................................................................................................................ 2?3

3. Surface-to-Surface Contact ................................................................................................................. 3?1 3.1. Using Surface-to-Surface Contact Elements ................................................................................... 3?1 3.2. Steps in a Contact Analysis ............................................................................................................ 3?1 3.3. Creating the Model Geometry and Mesh ....................................................................................... 3?2 3.4. Identifying Contact Pairs ............................................................................................................... 3?2 3.5. Designating Contact and Target Surfaces ...................................................................................... 3?3 3.5.1. Asymmetric Contact vs. Symmetric Contact .......................................................................... 3?4 3.5.1.1. Background ................................................................................................................. 3?4 3.5.1.2. Using KEYOPT(8) ......................................................................................................... 3?4 3.6. Defining the Target Surface .......................................................................................................... 3?4 3.6.1. Pilot Nodes .......................................................................................................................... 3?5 3.6.2. Primitives ............................................................................................................................. 3?5 3.6.3. Element Types and Real Constants ....................................................................................... 3?5 3.6.3.1. Defining Target Element Geometry .............................................................................. 3?5 3.6.4. Using Direct Generation to Create Rigid Target Elements ...................................................... 3?6 3.6.5. Using ANSYS Meshing Tools to Create Rigid Target Elements ................................................ 3?7 3.6.5.1. Some Modeling and Meshing Tips ............................................................................... 3?9 3.6.5.2. Verifying Nodal Number Ordering (Contact Direction) of Target Surface ..................... 3?10 3.7. Defining the Deformable Contact Surface .................................................................................... 3?11 3.7.1. Element Type ..................................................................................................................... 3?11 3.7.2. Real Constants and Material Properties ............................................................................... 3?12 3.7.3. Generating Contact Elements ............................................................................................. 3?13 3.8. Set the Real Constants and Element KEYOPTS .............................................................................. 3?14 3.8.1. Real Constants ................................................................................................................... 3?14 3.8.1.1. Positive and Negative Real Constant Values ............................................................... 3?16 3.8.2. Element KEYOPTS .............................................................................................................. 3?17 3.8.3. Selecting a Contact Algorithm (KEYOPT(2)) ......................................................................... 3?18 3.8.3.1. Background ............................................................................................................... 3?18 3.8.4. Determining Contact Stiffness and Allowable Penetration ................................................... 3?19 3.8.4.1. Background ............................................................................................................... 3?19 3.8.4.2. Using FKN and FTOLN ................................................................................................ 3?20 3.8.4.3. Using FKT and SLTO ................................................................................................... 3?20 3.8.4.4. Using KEYOPT(10) ...................................................................................................... 3?21 3.8.4.5. Chattering Control Parameters ................................................................................... 3?22 3.8.5. Choosing a Friction Model .................................................................................................. 3?22 3.8.5.1. Background ............................................................................................................... 3?22 3.8.5.2. Using TAUMAX, FACT, DC, and COHE ......................................................................... 3?23 3.8.5.3. Static and Dynamic Friction Coefficients .................................................................... 3?23 3.8.6. Selecting Location of Contact Detection ............................................................................. 3?25 3.8.6.1. Background ............................................................................................................... 3?25

ANSYS Contact Technology Guide . ANSYS Release 9.0 . 002114 . ? SAS IP, Inc.

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