Dilatancy of Shear Transformations in a Colloidal Glass

@article{Lu2017DilatancyOS,
  title={Dilatancy of Shear Transformations in a Colloidal Glass},
  author={Y. Z. Lu and Min Jiang and X. Lu and Zuoxiang Qin and Y. J. Huang and J. Shen},
  journal={Physical review applied},
  year={2017},
  volume={9},
  pages={014023}
}
Shear transformations, as fundamental rearrangement events operating in local regions, hold the key of plastic flow of amorphous solids. Despite their importance, the dynamic features of shear transformations are far from clear, which is the focus of the present study. Here, we use a colloidal glass under shear as the prototype to directly observe the shear-transformation events in real space. By tracing the colloidal-particle rearrangements, we quantitatively determine two basic properties of… Expand
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References

SHOWING 1-10 OF 42 REFERENCES
Local shear transformations in deformed and quiescent hard-sphere colloidal glasses.
TLDR
It is found that shear transformation zones exist and are active in both sheared and quiescent colloidal glasses, revealed by a distinctive fourfold signature in spatial autocorrelations of the local shear strain. Expand
Origin of stress overshoot in amorphous solids
Based on the shear-transformation-zone (STZ) theory, we propose a constitutive model for describing homogeneous elastoplastic deformation of amorphous solids where the interaction of shearExpand
Plastic deformation of metallic glasses: Size of shear transformation zones from molecular dynamics simulations
Plastic deformation in metallic glasses well below their glass transition temperatures Tg occurs spatially heterogeneously within highly localized regions, termed shear transformation zones (STZs).Expand
Elastic signature of flow events in supercooled liquids under shear.
TLDR
It is shown that, in the Newtonian regime, thermal activation triggers shear transformations, i.e., local irreversible shear events that produce Eshelby (long-ranged, anisotropic) deformation fields as previously seen in low-T glasses. Expand
Dynamics of viscoplastic deformation in amorphous solids
We propose a dynamical theory of low-temperature shear deformation in amorphous solids. Our analysis is based on molecular-dynamics simulations of a two-dimensional, two-component noncrystallineExpand
Long-range strain correlations in sheared colloidal glasses.
TLDR
By imposing an external stress, the applied shear induces a transition from homogeneous to inhomogeneous flow at a critical shear rate, and the role of strain correlations in this transition is investigated. Expand
Shear transformation zone dynamics model for metallic glasses incorporating free volume as a state variable
Abstract A mesoscale model, shear transformation zone dynamics (STZ dynamics), is employed to investigate the connections between the structure and deformation of metallic glasses. The present STZExpand
Activation energy of shear transformation zones: a key for understanding rheology of glasses and liquids.
  • S. G. Mayr
  • Materials Science, Medicine
  • Physical review letters
  • 2006
TLDR
A rheology model is proposed to quantitatively explain viscosity by determining the activation energy barrier and plastic yield strain of individual shear transformation zones as a function of size and external stress loading in classical molecular dynamics computer simulations on the model glass, CuTi. Expand
Analysis of plastic flow in an amorphous soap bubble raft by the use of an inter-bubble potential
Abstract The changes in potential energy, free volume, and internal shear strain in clusters undergoing shear transformations during the shearing of amorphous soap bubble rafts have been analysed byExpand
Structural Rearrangements That Govern Flow in Colloidal Glasses
TLDR
Using continuum models, the interplay between applied strain and thermal fluctuations that governs the formation of thermally induced structural rearrangements in both colloidal and molecular glasses is elucidated. Expand
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