Contact Regions |
 
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Contact Regions |
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Monitoring of clashing introduces a significant computational overhead, as all elements in the first set are checked for contact with all elements in the second set, for all the clashing regions that you have defined. When defining contact regions, you should be careful that you specify reasonable data to prevent excessive runtimes, by ensuring that the program is not checking for contact between points that will never approach. It is generally recommended that similar spatial discretisations be used for any element sets which may come into contact with each other. The choice of which element set is designated as first or second should be irrelevant – it is merely a convenience for the internal operation of the contact modelling algorithm.
You can optionally specify that active contact elements are be echoed to the output file. If you invoke this option, the output file shows you exactly what elements contact each other at every solution time. This feature is particularly useful as it allows you to refine the contact set element definitions and consequently reduce run times.
•*CLASHING is used to specify regions where clashing may occur, and suitable contact stiffness and damping values.