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[Jan Stránský <question690066@xxxxxxxxxxxxxxxxxxxxx>]

Question #690066 on Yade changed:
https://answers.launchpad.net/yade/+question/690066

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> normal strain rates (U_n)

geom.incidentVel [1], together with geom.refR1[2] and geom.refR2 [3] to
convert velocity to strain rate

> tangential strain rates ( U_t)

geom.shearInc [4], together with O.dt to convert strain increment to
strain rate

> components of the normal and tangential unit vectors ( n and t) in
global coordinates

n = geom.normal [5]

t is more tricky, there is no unique "t unit vectors", but only the
tangential plane is defined uniquely. You can choose some two
perpendicular vectors arbitrarily if you really need it (often working
with global coordinate system but assuming vectors being only in the
tangential plane is suitable).

cheers
Jan

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ScGeom.incidentVel
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ScGeom.refR1
[3] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ScGeom.refR2
[4] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ScGeom.shearInc
[5] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.ScGeom6D.normal

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