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Pré-Publication, Document De Travail Année : 2020

Tempering the mechanical response of FCC micro-pillars: an Eulerian plasticity approach

Résumé

The mechanical response of almost pure single-crystal micro-pillars under compression exhibits a highly localized behavior that can endanger the structural stability of a sample. Recent experiments revealed that the mechanical response of a crystal is very sensitive to both the presence of a quenched disorder in the sample and the orientation of the crystal. In this work, we study the influence of disorder and crystal orientation on the large strain response of a 2D FCC crystal with three active glide planes using a very simple Eulerian plasticity model in the FE framework. Our numerical and theoretical results on clean crystal pillars suggest that a single plane or many gliding planes can be activated depending on the crystal orientation. While in the former case, the deformation is localized, leading to ductile rupture, in the latter, a complex interplay between active planes takes place, resulting in a more uniform deformation. The strain-localization can be avoided when inhomogeneities are engineered inside the crystal, or the crystal orientation is altered because of the activation of multiple slip systems, resulting in a "patchwork" of the distribution of the slip systems.

Dates et versions

hal-02644578 , version 1 (28-05-2020)

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Oguz Umut Salman, Ioan R. Ionescu. Tempering the mechanical response of FCC micro-pillars: an Eulerian plasticity approach. 2020. ⟨hal-02644578⟩
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