  The interactions between dislocations and interface/grain boundaries,
including dislocation absorption, transmission, and reflection, have garnered
significant attention from the research community for their impact on the
mechanical properties of materials. However, the traditional approaches used to
simulate grain boundaries lack physical fidelity and are often incompatible
across different simulation methods. We review a new mesoscale interface
boundary condition based on Burgers vector conservation and kinetic dislocation
reaction processes. The main focus of the paper is to demonstrate how to unify
this boundary condition with different plasticity simulation approaches such as
the crystal plasticity finite element, continuum dislocation dynamics, and
discrete dislocation dynamics methods. To validate our interface boundary
condition, we implemented simulations using both the crystal plasticity finite
element method and a two-dimensional continuum dislocation dynamics model. Our
results show that our compact and physically realistic interface boundary
condition can be easily integrated into multiscale simulation methods and yield
novel results consistent with experimental observations.
