Critical resolved shear stress is an important factor to the deformation of materials.
The numerical value of crss determines the deform mechanism and the ductility of materials.
Is there some generalized theory which can explain the influence?
Thank you.

Hi EVM,

 

I had not encoutered it before, so mechanical design can live without it...

http://en.wikipedia.org/wiki/Critical_resolved_shear_stress

 

It looks like one more attempt to deduce mechanical properties of materials from their crystal structure, and, how to say, such attempts fail with a high regularity. I wouldn't invest too much time searching for such theories. Young's modulus can be more or less explained, but deformation and ductility aren't predicted usually.

 

Anyway, single crystals are an exception in mechanical design; I know of nickel-alloy turbine blades, which are grown single-crystal. Even for them, crystallography make inaccurate predictions - and grain boundaries define much more how polycrystals behave.