Calculation of Schmid factor for Titanium

[Karthik Palaniappan]

Sir,

I need to calculate the Schmid factor for the EBSD data under a simple shear load. How can I input the stress tensor for simple shear loading in mtex and calculate the Schmid factors for various slip systems. Is there a code to do this?

Thanks in advance

[ruediger Kilian]

Hi,
"simple shear" should refer to simple shear progressive deformation or flow. For infinitesimal strain, stress axes are parallel to the instantaneous stretching axes, i.e. 45° to the flow plane.
Does that help?
Cheers,
Rüdiger

[Karthik Palaniappan]

Hi, I am on machining problem, where I come across a large strain. In that case, how do I define the stress tensor. Furthermore, my EBSD data is obtained from the plane containing the RD-ND. How do I take care of this coordinate system. Please help. 

Thanks in advance

[Rüdiger Kilian]

Hi,
Mtex uses a coordiante system with x,y,z. You need to know which of the names you use for your coordinate axes correspond to x or to y, there's no way of guessing that and it'll depend on your instrument/acquisition setup.

With respect to your stress tensor, - like I mentioned earlier, - if it is just the Schmid factor, you use the principal stresses being parallel to the instantaneous stretching axes, finite strain is irrelevant here. I.e for simple shear, 45° with respect to the flow plane.

Hope helps.
Cheers,
Rüdiger