Question #661573 on Yade changed:
https://answers.launchpad.net/yade/+question/661573
Status: Open => Answered
Bruno Chareyre proposed the following answer:
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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