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[Jan Stránský <question703791@xxxxxxxxxxxxxxxxxxxxx>]

Question #703791 on Yade changed:
https://answers.launchpad.net/yade/+question/703791

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

> a positive shear force is applied

no, the script applies strain (of course, stress is then a consequence)
[1]

> I want to apply a positive shear stress to stress σxz and then a
negative shear force to stress σxz.

if you are ok with the same approach (apply strain), then simply:
###
O.cell.velGrad = Matrix3(0, 0, .1, 0, 0, 0, 0, 0, 0)
# some running until "then"
O.cell.velGrad = Matrix3(0, 0, -.1, 0, 0, 0, 0, 0, 0) # note the opposite non-zero value
###

Cheers
Jan

[1] https://gitlab.com/yade-
dev/trunk/blob/master/doc/sphinx/tutorial/04-periodic-simple-
shear.py#L75

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