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Friction Command

The command has been deprecated. You should set crack friction properties using a ContactCracks command and set material-to-material friction using a Contact material property instead.

The Friction command can set the default contact conditions on crack surfaces or set custom material-to-material contact for multimaterial mode MPM:

Friction (frict),<(matid)>

where

When the Friction command is by itself, it defines the default frictional properties for crack contact. When it is used inside a material definition block, however, it defines custom frictional properties for contact between the current material and the other material specified in (matid) (which is required) when using multimaterial mode MPM.

Notes

  1. You only need to enter the Friction command for one of the two materials in each pair. Since you have to provide the material ID, you should use the Friction command in the second material after the first one has already been defined.
  2. Frictional energy on crack surfaces can optionally be converted into heat when running conduction calculations.
  3. The Friction command is only allowed for MPM analyses.