Interface-Dominated Plasticity and Kink Bands in Metallic Nanolaminates

The theoretical and computational framework of finite deformation mesoscale field dislocation mechanics (MFDM) is used to understand the salient aspects kink-band formation in Cu-Nb nano-metallic laminates (NMLs). A conceptually minimal, plane-strain idealization three-dimensional geometry, including crystalline orientation, additively manufactured NML model NMLs. Importantly, natural jump/interface condition MFDM imposing continuity (certain components) plastic strain rates across interfaces allows theory-driven ‘communication’ flow laminate boundaries our element implementation. Kink bands under layer parallel compression NMLs accord with experimental observations arise numerical simulations. possible mechanisms for orientation kink are discussed, within scope idealized framework. We also report results corresponding various parametric studies that provide preliminary insights clear questions future work on understanding intricate underlying bands.