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Re: [Question #235934]: Reference for coeff of restitution in Hertz-Mindlin with non-linear damping

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Yuxuan Wen <question235934@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 01 Aug 2019 02:22:35 -0000
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Question #235934 on Yade changed:
https://answers.launchpad.net/yade/+question/235934

Yuxuan Wen posted a new comment:
Hello Guys,

I just checked the source file of  Hertz-Mindlin model and found that the shear stiffness ks is a little different with that in Tsuji's paper (1992).  In the source file it is expressed as:
    Real Kso = 2*sqrt(4*R)*G/(2-V); // coefficient for shear stiffness" 
in line 58. See https://github.com/yade/trunk/blob/master/pkg/dem/HertzMindlin.cpp
But in Tsuji's paper, it is Kso = 2*sqrt(2*R)*G/(2-V), so a factor of sqrt(2) exists between these 2 expressions. 

Does it matter or is it just a typo? Should we correct it?

Thank you.

Regards,
Yuxuan

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