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[Question #271394]: Bending and twisting moment in CohFricPhys

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From: Alexander <question271394@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 14 Sep 2015 18:57:34 -0000
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New question #271394 on Yade:
https://answers.launchpad.net/yade/+question/271394

Hello everybody!

Bending and twisting moment in CohFricPhys computes via relative rotations between particles (https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Law2_ScGeom6D_CohFrictPhys_CohesionMoment)

Can anyone help me to understand how computes relative rotations between interacting particles in Law2_ScGeom6D_CohFrictPhys_CohesionMoment. Is it done incrementally at each step via angular velocities like in ("A bonded-particle model for rock" D.O. Potyondya, P.A. Cundall http://mech.spbstu.ru/images/b/bd/Potyondy_Cundall_2004_A_bonded-particle_model_for_rock.pdf)?

If "yes" why in [Bourrier2013] the incremental computations is only for shear force and not for rotational vectors.

with regards Alexander

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