Yade

Shear force calculation

Asked by Yor1

Hi Yade users,

I have a general question about Shear and Normal force calculation in DEM code Yade.
Why we calculate the shear force incrementally, whereas we don't calculate the normal force incrementally ?

Best regards.
Jabrane.

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Bruno Chareyre (bruno-chareyre) said : 		#1

Hi there are two main reasons.
1- The normal direction is uniquely defined, the shear direction is not (it is a plane) and for this reason we need to keep track of shear force orientation by time integration
2- The normal behavior is elastic (in most cases) while the shear one is not (in most cases)
Bruno

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Yor1 (jabrane-hamdi) said : 		#2

Hi Bruno,

Thank you !
That resolve my problem.

Best regards.
Jabrane.

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Yor1 (jabrane-hamdi) said : 		#3

Hello Bruno,

I still have question : what do you mean by the normal direction is uniquely defined and shear direction is not ?

Best regards.
Jabrane.

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Bruno Chareyre (bruno-chareyre) said : 		#4

I would suggest the part of the documentation dealing with interactions:
https://yade-dem.org/doc/formulation.html#creating-interaction-between-particles

Bruno