New question #673800 on Yade:
https://answers.launchpad.net/yade/+question/673800

Hi, i would like To have some informations about the interaction between facet 
And sphere using cundall-strack law. I read The "DEM beckgraund" where IT 
explains the Logic of The contact law between sphere-sphere. As Is well 
explained, there Are springs  between The two balls, And knowing The young 
modulus And The elastic lenght of the "Springs" during the contact , IT can 
obtain The forces.

Then, considering a facet- ball  contact, How can IT recover The force? I mean, 
facets ( considering them dynamic, with mass And inertia) don t have thickness. 
How can Yade consider The spring? 

I m facing this problem Becouse i clumped more facets togheter( from a mesh 
file). Clumping them toghether,  i obtained a rigid body. Rigid body Is rigid 
for definition, But Modifyding The facets material, i obtain different forces 
during the  rigid body impact( IT impacts against spheres body) . How can yade 
calculate IT if the body Is rigid And doeSn t have thickness Becouse Is Made by 
facets?



I hope you can understand what i 'm trying To explain. Thanks for your time.

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