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Yielding of a Model Glassformer: an Interpretation with an Effective System of Icosahedra
- Publication Year :
- 2018
-
Abstract
- We consider the yielding under simple shear of a binary Lennard-Jones glassformer whose super-Arrhenius dynamics are correlated with the formation of icosahedral structures. We recast this glassformer as an effective system of icosahedra [Pinney et al. J. Chem. Phys. 143 244507 (2015)]. Looking at the small-strain region of sheared simulations, we observe that shear rates affect the shear localisation behavior particularly at temperatures below the glass transition as defined with a fit to the Vogel-Fulcher-Tamman equation. At higher temperature, shear localisation starts immediately upon shearing for all shear rates. At lower temperatures, faster shear rates can result in a delayed start in shear localisation; which begins close to the yield stress. Building from a previous work which considered steady-state shear [Pinney et al. J. Chem. Phys. 143 244507 (2016)], we interpret the response to shear and the shear localisation in terms of a \emph{local} effective temperature with our system of icosahedra. We find that the effective temperatures of the regions undergoing shear localisation increase significantly with increasing strain (before reaching a steady state plateau).<br />Comment: 13 pages, accepted in Phys. Rev. E
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1803.03776
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevE.97.032609