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Interface-dominated plasticity and kink bands in metallic nanolaminates

Abhishek Arora's picture

Abhishek Arora, Rajat Arora, Amit Acharya

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

Link to paper: Interface_dominated_plasticity_and_kink_bands_in_metallic_nanolaminates

With the same model, in past work, we were able to obtain similar scalings for drastically different size effects as observed in micropillar compression experiments, without any ad-hoc modifications to theory including boundary conditions. 

Link to micropillar work: mechanics_of_micropillar_confined_thin_film_plasticity

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