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The gradient crystal plasticity framework of Wulfinghoff et al. [53]incorporating an equivalent plastic strain and grain boundary yielding, isextended with additional grain boundary hardening. By comparison to averagedresults from many discrete dislocation dynamics (DDD) simulations of analuminum type tricrystal under tensile loading, the new hardening parameter inthe continuum model is calibrated. It is shown that although the grainboundaries (GBs) in the discrete simulations are impenetrable, an infinite GByield strength corresponding to microhard GB conditions, is not applicable inthe continuum model. A combination of a finite GB yield strength with anisotropic bulk Voce hardening relation alone also fails to model the plasticstrain profiles obtained by DDD. Instead, a finite GB yield strength incombination with GB hardening depending on the equivalent plastic strain at theGBs is shown to give a better agreement to DDD results. The differences in theplastic strain profiles obtained in DDD simulations by using differentorientations of the central grain could not be captured, indicating that themisorientation dependent elastic interaction of dislocations reaching over theGBs should be included in the continuum model.

Equivalent Plastic Strain Gradient Plasticity with Grain Boundary Hardening and Comparison to Discrete Dislocation Dynamics