Abstract
The jump condition at a possibly non-material interface for geometrically-necessary dislocation density in field dislocation mechanics (FDM) and its averaged approximation, phenomenological mesoscopic FDM (PMFDM), is derived. In the context of grain boundaries, the condition implies a tensorial constraint on all five grain boundary parameters, slip transmission at the boundary, possible grain boundary motion and dislocation nucleation/annihilation at the grain boundary. The jump condition is physically interpreted in special cases, and the importance of understanding dislocation motion at a boundary/interface as a flux across curves, and not surfaces, is emphasized.
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