Regensburg 2016 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 5: Nanomaterials I: Mechanics

MM 5.3: Talk

Monday, March 7, 2016, 10:45–11:00, H53

Modeling the Mechanics of Metallic Nanolattices — •Alexander Stukowski¹ and Bernhard Eidel² — ¹Technische Universität Darmstadt — ²Universität Siegen

Ultralight metallic lattices are a special form of cellular material with structural features on the micron and nanometer scales. Very recent advances in fabrication techniques and several promising applications have sparked great interest in the optimization of such materials and in developing an understanding of the underlying physical mechanisms that determine their stiffness and strength.

Continuum mechanics descriptions alone, however, are unable to describe important small-scale materials phenomena, most notably the transition from nanoelasticity to nanoplasticity. In this contribution we present results from fully atomistic simulations of metallic nanolattices, which have been performed for the first time to investigate the competing elastic and inelastic processes that determine the performance of these structural materials. Our large-scale simulations indicate that the prevailing plastic deformation mechanisms in thin-walled, Ni-based nanolattices is twinning while the deformation of full-profile lattice structures beyond the elastic regime is carried by dislocations. The extent of the elastic regime is controlled by the shape and architecture of the structures, but also local features such as notches and fillets that can induce or prevent stress concentrations.