ANSYS Contact Technology Guide

1 ANSYS ContactTechnology GuideANSYS Release 2004 ANSYS , Inc. is aUL registeredISO 9001: Contact Technology GuideANSYS Release , Technology DriveCanonsburg, PA 724-746-3304(F) 724-514-9494 Copyright and Trademark InformationCopyright 2004 SAS IP, Inc. All rights reserved. Unauthorized use, distribution or duplication is , DesignSpace, CFX, DesignModeler, DesignXplorer, ANSYS Workbench environment, AI*Environment, CADOE and any and all ANSYS , Inc. productnames referenced on any media, manual or the like, are registered trademarks or trademarks of subsidiaries of ANSYS , Inc.

2 Located in the United States orother countries. ICEM CFD is a trademark licensed by ANSYS , Inc. All other trademarks and registered trademarks are property of their respective , Inc. is a UL registered ISO 9001: 2000 Inc. products may contain Patent No. 6,055, , Windows, Windows 2000 and Windows XP are registered trademarks of Microsoft and Mechanical Desktop are registered trademarks of Autodesk, is a registered trademark of SolidWorks is a registered trademark of Parametric Technology , Solid Edge and Parasolid are registered trademarks of Electronic Data Systems Corporation (EDS).

3 ACIS and ACIS Geometric Modeler are registered trademarks of Spatial Technology , License Manager is a trademark of Macrovision ANSYS , Inc. software product and program documentation is ANSYS Confidential Information and are furnished by ANSYS , Inc. under an ANSYS software license agreement that contains provisions concerning non-disclosure, copying, length and nature of use, warranties, disclaimers and remedies,and other provisions. The Program and Documentation may be used or copied only in accordance with the terms of that license the ANSYS , Inc.

4 Online documentation or the ANSYS , Inc. documentation CD for the complete Legal this is a copy of a document published by and reproduced with the permission of ANSYS , Inc., it might not reflect the organization or physical appearanceof the original. ANSYS , Inc. is not liable for any errors or omissions introduced by the copying process. Such errors are the responsibility of the partyproviding the of Contents1. Contact Overview .. 1 General Contact Classification .. 1 ANSYS Contact Capabilities.

5 1 Surface-to-Surface Contact Elements .. 1 Node-to-Surface Contact Elements .. 1 Node-to-Node Contact Elements .. 1 32. GUI Aids for Contact Analyses .. 2 The Contact Manager .. 2 The Contact Wizard .. 2 Managing Contact Pairs .. 2 33. Surface-to-Surface Contact .. 3 Using Surface-to-Surface Contact Elements .. 3 Steps in a Contact Analysis .. 3 Creating the Model Geometry and Mesh .. 3 Identifying Contact Pairs .. 3 Designating Contact and Target Surfaces .. 3 Asymmetric Contact vs.

6 Symmetric Contact .. 3 Background .. 3 Using KEYOPT(8) .. 3 Defining the Target Surface .. 3 Pilot Nodes .. 3 Primitives .. 3 Element Types and Real Constants .. 3 Defining Target Element Geometry .. 3 Using Direct Generation to Create Rigid Target Elements .. 3 Using ANSYS Meshing Tools to Create Rigid Target Elements .. 3 Some Modeling and Meshing Tips .. 3 Verifying Nodal Number Ordering ( Contact Direction) of Target Surface .. 3 Defining the Deformable Contact Surface.

7 3 Element Type .. 3 Real Constants and Material Properties .. 3 Generating Contact Elements .. 3 Set the Real Constants and Element KEYOPTS .. 3 Real Constants .. 3 Positive and Negative Real Constant Values .. 3 Element KEYOPTS .. 3 Selecting a Contact Algorithm (KEYOPT(2)) .. 3 Background .. 3 Determining Contact Stiffness and Allowable Penetration .. 3 Background .. 3 Using FKN and FTOLN .. 3 Using FKT and SLTO .. 3 Using KEYOPT(10) .. 3 Chattering Control Parameters.

8 3 Choosing a Friction Model .. 3 Background .. 3 Using TAUMAX, FACT, DC, and COHE .. 3 Static and Dynamic Friction Coefficients .. 3 Selecting Location of Contact Detection .. 3 Background .. 3 25 ANSYS Contact Technology Guide . ANSYS Release . 002114 . SAS IP, Using KEYOPT(4) and TOLS .. 3 Adjusting Initial Contact Conditions .. 3 Background .. 3 Using PMIN, PMAX, CNOF, ICONT, KEYOPT(5), and KEYOPT(9) .. 3 Physically Moving Contact Nodes Towards the Target Surface.

9 3 Determining Contact Status and the Pinball Region .. 3 Background .. 3 Using PINB .. 3 Avoiding Spurious Contact in Self Contact Problems .. 3 Selecting Surface Interaction Models .. 3 Background .. 3 Using KEYOPT(12) and FKOP .. 3 Bonded Contact for Shell-Shell Assemblies .. 3 Modeling Contact with Superelements .. 3 Background .. 3 Using KEYOPT(3) .. 3 Accounting for Thickness Effect .. 3 Background .. 3 Using KEYOPT(11) .. 3 Using Time Step Control .. 3 Background.

10 3 Using KEYOPT(7) .. 3 Using the Birth and Death Option .. 3 Controlling the Motion of the Rigid Target Surface (Rigid-to-Flexible Contact ) .. 3 Applying Necessary Boundary Conditions to the Deformable Elements .. 3 Defining Solution and Load Step Options .. 3 Solving the Problem .. 3 Reviewing the Results .. 3 Points to Remember .. 3 Reviewing Results in POST1 .. 3 Reviewing Results in POST26 .. 3 454. Node-to-Surface Contact .. 4 The Node-to-Surface Contact Element.