Michael Ortiz

TL;DR: In this paper, the authors evaluate the extent to which two mechanisms contribute to the observed size effect of the ultimate yield strength of micropillars of diameters in the range of 1-30 µm: dislocation pile-ups, modeled by means of a physically based non-local single-crystal plasticity model; and the short-range interaction of dislocations with the free surface of the microdrone, e.g., through the formation of surface steps.

TL;DR: In this article, a three-dimensional model of intergranular hydrogenembrittlement (HE) is presented to account for the degradation of grainboundary strength that arises from hydrogen coverage.

TL;DR: In this article, a phase-field model of slip over a slip plane is described by means of multiple integer-valued phase fields, and all the terms in the total energy of the crystal, including the long-range elastic energy and the Peierls interplanar energy, can be written explicitly in terms of the multi-phase field.

TL;DR: In this paper, the authors present a modeling approach to bridge the atomistic with macroscopic scales in crystalline materials, including the effect of temperature and strain-rate on the hardening rate.

TL;DR: The here proposed second-order data-driven paradigm is a plug-in method for distance-minimizing as well as entropy-maximizing data- driven schemes and aims to minimize a suitably defined free energy over phase space subject to compatibility and equilibrium constraints.