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Old   May 10, 2006, 16:40
Default frictional model
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Hi all. I'm trying to modify the Schaeffer's frictional viscosity model. But I cannot find the expression of "the second invariant of the deviatoric stress tensor". I have to make a UDF. Dose anyone know the expression of "the second invariant of the deviatoric stress tensor" by using C language?

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Old   October 18, 2010, 02:26
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Hi oka, Could you learn to make a UDF for Schaeffer's frictional viscosity. If yes, please guide me too.
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