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. 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.

2 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).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.

3 The Program and Documentation may be used or copied only in accordance with the terms of that license the ANSYS , Inc. 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 .. 1 Surface-to-Surface Contact Elements .. 1 Node-to-Surface Contact Elements .. 1 Node-to-Node Contact Elements .. 1 32.

4 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. 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.

5 3 Verifying Nodal Number Ordering ( Contact Direction) of Target Surface .. 3 Defining the Deformable Contact Surface .. 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 .. 3 Choosing a Friction Model .. 3 Background .. 3 Using TAUMAX, FACT, DC, and COHE .. 3 Static and Dynamic Friction Coefficients.

6 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 .. 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).

7 3 Accounting for Thickness Effect .. 3 Background .. 3 Using KEYOPT(11) .. 3 Using Time Step Control .. 3 Background .. 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 .. 4 Performing a Node-to-Surface Contact Analysis .. 4 CONTA175 KEYOPTS .. 4 KEYOPT(3) .. 4 KEYOPT(4).

8 4 CONTA175 Real Constants .. 4 Using CONTA175 for Multiphysics Contact .. 4 35. Multiphysics Contact .. 5 Modeling Thermal Contact .. 5 Thermal Contact Behavior vs. Contact Status .. 5 Free Thermal Surface .. 5 Temperature on Target Surface .. 5 Modeling Conduction .. 5 Using TCC .. 5 Using the Quasi Solver Option .. 5 Modeling Convection .. 5 Modeling Radiation .. 5 Background .. 5 Using SBCT and RDVF .. 5 Modeling Heat Generation Due to Friction .. 5 4 ANSYS Contact Technology GuideANSYS Contact Technology Guide . ANSYS Release . 002114 . SAS IP, Background .. 5 Using FHTG and FWGT .. 5 Modeling External Heat Flux .. 5 Modeling Electric Contact .. 5 Modeling Surface Interaction.

9 5 Background .. 5 Using ECC .. 5 Modeling Heat Generation Due to Electric Current .. 5 Modeling Magnetic Contact .. 5 Using MCC .. 5 Modeling Perfect Magnetic Contact .. 5 86. Node-to-Node Contact .. 6 Node-to-Node Contact Elements .. 6 Performing a Node-to-Node Contact Analysis .. 6 Creating Geometry and Meshing the Model .. 6 Generating Contact Elements .. 6 Generating Contact Elements Automatically at Coincident Nodes .. 6 Generating Contact Elements Automatically at Offset Nodes .. 6 Node Ordering .. 6 Defining the Contact Normal .. 6 Defining the Initial Interference or Gap .. 6 Selecting the Contact Algorithm .. 6 Applying Necessary Boundary Conditions .. 6 Defining the Solution Options.

10 6 Solving the Problem .. 6 Reviewing the Results .. 6 77. Multipoint Constraints and Assemblies .. 7 Modeling Solid-Solid and Shell-Shell Assemblies .. 7 Modeling a Shell-Solid Assembly .. 7 Surface-Based Constraints .. 7 Defining Surface-Based Constraints .. 7 Modeling a Beam-Solid Assembly .. 7 Restrictions and Recommendations for Internal MPC .. 7 118. Spot Welds .. 8 Defining a Spot Weld Set .. 8 Creating a Basic Spot Weld Set with SWGEN .. 8 The Components of a Spot Weld .. 8 Adding Surfaces to a Basic Set .. 8 Listing and Deleting Spot Welds .. 8 11 List of Contact Manager Toolbar .. 2 Example of a Contact Wizard Dialog .. 2 Localized Contact Zones .. 3 ANSYS Geometric Entities and Their Corresponding Rigid Target Elements.