  Using a correlation between local yielding and a multiaxial
strength-to-stiffness parameter, the continuum-scale yield surface for a
polyphase, polycrystalline solid is predicted. The predicted surface explicitly
accounts for microstructure through the quantification of strength-to-stiffness
based on a finite element model of a crystal-scale sample. The multiaxial
strength-to-stiffness is evaluated from the elastic response of the sample and
the restricted slip, single-crystal yield surface. Macroscopic yielding is
defined by the propogation of a yield band through the sample and is detected
with the aid of a flood fill agorithm. The methodology is demonstrated with the
evaluation of a plane-stress yield surface for a dual-phase superaustenitic
stainless steel.
