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harmonic average of stiffness

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Nasibeh Moradi <nasibeh.moradi@xxxxxxxxx>
Date: Mon, 19 Apr 2010 13:24:22 +0430

hi,

in contact law, harmonic average is used  for computing kn and ks in contact
between 2 body, why harmonic average?
in some papers, the springs are in serie, then k=ka*kb/(ka+kb),
but in harmonic average k=2*ka*kb/(ka+kb)

Nasibeh Moradi