S

Quantity averaging the influence of various grain orientations on the

resolved shear stress

,

τ

, in a

polycrystal

:

σ

=

M

τ

where

M

is the Sachs factor and

σ

is the

flow stress

. The averaging is undertaken under the supposition that each

grain

deforms separately. Reciprocal Sachs factor can be used for polycrystals, instead of

Schmid factor

, whose magnitude is defined for a single grain only. Reciprocal Sachs factor is 0.446 in a nontextured polycrystal with

FCC structure

.