Stress tensor for scratch test

[Mustafa-Rifat]

Hi,

I was going through the documentation of schmid factor calculation. I want to see the slip trace of the grains. I have performed a scratch test on my sample. The ebsd map is shown below with the x and y direction. I was wondering what my stress tensor should be for this. Scratch is not uniaxial as it both indents and moves forward. So there should be a z component of the stress tensor along with a y component, according to the image attached.
My question is: should the stress tensor be:
sigma = stressTensor(diag([0 1 1]));
sigma = stressTensor(diag([0 1 -1]));

[kilir]

Hi,
from my point of view, as soon as things move, the stress tensor for every point is a function of the material response to being displaced/deformed, e.g. by the scratching thing you use. For a constant displacement rate, it will also depend on the orientation of your grain.
Cheers,
Rüdiger

[Mustafa-Rifat]

So it won't be as simple as:
sigma = stressTensor(diag([0 1 1]));
or sigma = stressTensor(diag([0 1 -1]));?
How do I get the stress tensor values? Finite Element Analysis?