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DOE OSTI · 2446817

Generalized grain boundary constitutive description implemented in a strain-gradient large-strain FFT-based formulation: Application to nano-metallic laminates

Zecevic, Miroslav·Lebensohn, Ricardo A.·Capolungo, Laurent
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Abstract

Herein this paper presents a general treatment of grain boundary constitutive behavior in the context of strain-gradient (SG) plasticity, and its numerical implementation in a large-strain (LS) elasto-viscoplastic (EVP) fast Fourier transform (FFT)-based micromechanical model. Two novel grain boundary constitutive equations are proposed, allowing for more accurate description of the Burgers vector flow at the grain boundary. The capabilities of the generalized SG-LS-EVPFFT formulation are illustrated for the case of kink-band formation during layer-parallel compression of nano-metallic laminates (NMLs), requiring consideration of the interaction between dislocations and interfaces.

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36 MATERIALS SCIENCEFFT-based methodsgrain boundariesinterface-dominated plasticitykink bandsnano-metallic laminatesstrain-gradient plasticity

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Zecevic, Miroslav, Lebensohn, Ricardo A., Capolungo, Laurent. 2024-09-12. Generalized grain boundary constitutive description implemented in a strain-gradient large-strain FFT-based formulation: Application to nano-metallic laminates. https://doi.org/10.1016/j.jmps.2024.105859

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36 MATERIALS SCIENCE↗