Yielding of a Model Glassformer: an Interpretation with an Effective System of Icosahedra
arXiv:1803.03776 · doi:10.1103/PhysRevE.97.032609
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).
arXiv comment13 pages, accepted in Phys. Rev. E
References in corpus (64)
- Dynamics of Viscoplastic Deformation in Amorphous Solids
- Theoretical perspective on the glass transition and amorphous materials
- Yield Stress Materials in Soft Condensed Matter
- Supercooled Liquids for Pedestrians
- Theory of Structural Glasses and Supercooled Liquids
- Rheological constitutive equation for model of soft glassy materials
- The Physics of the Colloidal Glass Transition
- Fractal free energy landscapes in structural glasses
- The role of local structure in dynamical arrest
- Thermodynamic signature of growing amorphous order in glass-forming liquids
- Deformation and Failure of Amorphous Solidlike Materials
- Models and algorithms for the next generation of glass transition studies
- Strain localization and percolation of stable structure in amorphous solids
- Local elasticity map and plasticity in a model Lennard-Jones glass
- Roles of icosahedral and crystal-like order in hard spheres glass transition
- Bulk Metallic Glasses Deform via Slip Avalanches
- Plastic Response of a 2D Lennard-Jones amorphous solid: Detailed analysis of the local rearrangements at very slow strain-rate
- A mode-coupling theory for the pasty rheology of soft glassy materials
- Effective Temperatures of a Driven System Near Jamming
- A study of the static yield stress in a binary Lennard-Jones glass
- Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures
- Shear banding and flow-concentration coupling in colloidal glasses
- Strain localization in a shear transformation zone model for amorphous solids
- Shearing a Glassy Material: Numerical Tests of Nonequilibrium Mode-Coupling Approaches and Experimental Proposals
- Shear yielding of amorphous glassy solids: Effect of temperature and strain rate
- Identification of structure in condensed matter with the topological cluster classification
- Evaluation of the "disorder temperature" and "free volume" formalisms via simulations of shear banding in amorphous solids
- Anharmonicity and quasi-localization of the excess low-frequency vibrations in jammed solids
- The building blocks of dynamical heterogeneities in dense granular media
- Decoupling of diffusion from structural relaxation and spatial heterogeneity in a supercooled simple liquid
- Growing timescales and lengthscales characterizing vibrations of amorphous solids
- Breakdown of Elasticity in Amorphous Solids
- Spontaneous formation of permanent shear bands in a mesoscopic model of flowing disordered matter
- Identification of long-lived clusters and their link to slow dynamics in a model glass former
- Equilibrium phase diagram of a randomly pinned glass-former
- Correlation of Local Order with Particle Mobility in Supercooled Liquids is Highly System Dependent
- RUMD: A general purpose molecular dynamics package optimized to utilize GPU hardware down to a few thousand particles
- Rate dependent shear bands in a shear transformation zone model of amorphous solids
- Localised soft modes and the supercooled liquid's irreversible passage through its configuration space
- Information-theoretic measurements of coupling between structure and dynamics in glass-formers
- Decorrelation of the static and dynamic length scales in hard-sphere glass-formers
- Predicting plasticity with soft vibrational modes: from dislocations to glasses
- Growing static and dynamic length scales in a glass-forming liquid
- Effects of inertia on the steady-shear rheology of disordered solids
- Strong geometric frustration in model glassformers
- Yielding of binary colloidal glasses
- On the relevance of disorder in athermal amorphous materials under shear
- Predicting plastic flow events in athermal shear-strained amorphous solids
- Ergodicity and Slowing Down in Glass-Forming Systems with Soft Potentials: No Finite-Temperature Singularities
- Soft modes and non-affine rearrangements in the inherent structures of supercooled liquids
- Characterizing order in amorphous systems
- Shear banding of colloidal glasses - a dynamic first order transition?
- From glass formation to icosahedral ordering by curving three-dimensional space
- Locally favoured structures and dynamic length scales in a simple glass-former
- Shear-induced anisotropic decay of correlations in hard-sphere colloidal glasses
- Using mutual information to measure order in model glass-formers
- Statistical Mechanics and Dynamics of a 3-Dimensional Glass-Forming System
- Single particle fluctuations and directional correlations in driven hard sphere glasses
- Patch-repetition correlation length in glassy systems
- Correlation between crystalline order and vitrification in colloidal monolayers
- Recasting a model atomistic glassformer as a system of icosahedra
- Plastic response and correlations in athermally sheared amorphous solids
- Non-Affine Displacements and the Non-Linear Response of a Strained Amorphous Solid
- Structure in Sheared Supercooled Liquids: Dynamical Rearrangements of an Effective System of Icosahedra