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Re: [Question #705007]: contact model for overlappped part of a clump

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: "Guo, Chang" <question705007@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 09 Feb 2023 08:10:47 -0000
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Question #705007 on Yade changed:
https://answers.launchpad.net/yade/+question/705007

Guo, Chang posted a new comment:
Dear Karol,

Thanks for your reply.

I didn't express myself clearly. 
Assuming such a situation, there is a single sphere, A, and a clump, B, with two spheres, C and D. C and D have an overlapped zone. Normal stiffness between each pair of particles is kn . There is a contact between A and B and the penetration depth is delta. When this contact isn't at the overlapped zone, the normal force should be delta*kn. However, if this contact is at the overlapped zone, the normal force would be calculated twice, that is, 2*delta*kn. It looks unphysical.

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