Workbench Mechanical - Introduction to Contact
Workbench Mechanical - Introduction to Contact
Workbench Mechanical - Introduction to Contact
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<strong>Workbench</strong> <strong>Mechanical</strong> - <strong>Introduction</strong> <strong>to</strong> <strong>Contact</strong><br />
B. <strong>Contact</strong> Formulations<br />
• For nonlinear solid body contact of faces, Pure Penalty or<br />
Augmented Lagrange formulations can be used:<br />
– Both of these are penalty-based contact formulations:<br />
F = k<br />
normal normal penetration<br />
Here, for a finite contact force F normal , there is a concept of contact<br />
stiffness k normal . The higher the contact stiffness, the lower the<br />
penetration x penetration , as shown in the figure below<br />
x<br />
Training Manual<br />
– Ideally, for an infinite k normal , one would get zero penetration. This is not<br />
numerically possible with penalty-based methods, but as long as<br />
x penetration is small or negligible, the solution results will be accurate.<br />
F n<br />
x p<br />
ANSYS, Inc. Proprietary<br />
© 2009 ANSYS, Inc. All rights reserved.<br />
3-5<br />
April 30, 2009<br />
Inven<strong>to</strong>ry #002659
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