Thanks for the replies.
I am still a bit unclear. Is there a relation between the slip planes, critically resolved shear stress that we study in material science and the stresses that we find on oblique planes in strength of materials. Or are they separate? If they are separate, where do the...
A polycrystalline material is made up of many grains and grain boundaries. Each grain consists of lattices in different planes and hence different slip planes. Is that why we find stresses on different planes using mohrs circle(or analytically) even in a uniaxial tensile test.