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[Question #690066]: Using O.forces along normal and tangential directions at contact

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From: Rioual <question690066@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 20 Apr 2020 14:28:59 -0000
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New question #690066 on Yade:
https://answers.launchpad.net/yade/+question/690066

Hello,

I would like to add a force at the contact particles with O.forces (doing a loop on all interactions between particles). 
This force evolves in a complex way in time and has a normal component Fn dependant on normal strain rate and tangential component Ft dependant on tangential strain rate. Can I have access easily normal strain rates (U_n) , tangential strain rates ( U_t) and components  of the normal and tangential unit vectors ( n and t)  in global coordinates (to use O.forces) ??? by ScGeom ? How ??

Thanks for your help,

Best 

Vincent 

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