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

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jan Stránský <question690066@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 21 Apr 2020 13:03:37 -0000
Reply-to: question690066@xxxxxxxxxxxxxxxxxxxxx
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Question #690066 on Yade changed:
https://answers.launchpad.net/yade/+question/690066

    Status: Open => Answered

Jan Stránský proposed the following answer:
> IMO if you do not really really need it (which should be the case) or
do not know exactly what you are doing (you would not ask), then do not
use shear components in local coordinate system.

Also sorry for not being clear, the best is (IMO) not to use shear components at all and simply work in global coordinate system. E.g. the phys.shearForce, geom.shearIncrement... are just one vector.
If you need/want to decompose it into two in-tangential-plane components, it is possible, but, as mentioned above, often (always?) it is not necessary.

If it is still not clear, maybe you can describe more in detail "evolves
in a complex way in time" for "if you do not really really need it"
verification.

cheers
Jan

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