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Long-Lived Neighbors Determine the Rheological Response of Glasses
- Source :
- Physical Review Letters. 118
- Publication Year :
- 2017
- Publisher :
- American Physical Society (APS), 2017.
-
Abstract
- Glasses exhibit a liquid-like structure but a solid-like rheological response with plastic deformations only occurring beyond yielding. Thus, predicting the rheological behavior from the microscopic structure is difficult, but important for materials science. Here, we consider colloidal suspensions and propose to supplement the static structural information with the local dynamics, namely the rearrangement and breaking of the cage of neighbors. This is quantified by the mean squared nonaffine displacement and the number of particles that remain nearest neighbors for a long time, i.e. long-lived neighbors, respectively. Both quantities are followed under shear using confocal microscopy and are the basis to calculate the affine and nonaffine contributions to the elastic stress, which is complemented by the viscous stress to give the total stress. During start-up of shear, the model predicts three transient regimes that result from the interplay of affine, nonaffine and viscous contributions. Our prediction quantitatively agrees with rheological data and their dependencies on volume fraction and shear rate.<br />5 pages, 3 figures, Accepted for publication in Phys. Rev. Lett. Supplemental Information available as ancillary file
- Subjects :
- cond-mat.soft
Materials science
Particle number
FOS: Physical sciences
General Physics and Astronomy
02 engineering and technology
Condensed Matter - Soft Condensed Matter
021001 nanoscience & nanotechnology
01 natural sciences
Viscoelasticity
Condensed Matter::Soft Condensed Matter
Shear rate
Colloids, Glasses, Rheology, Confocal Microscopy
Shear (geology)
Rheology
0103 physical sciences
Volume fraction
Soft Condensed Matter (cond-mat.soft)
Affine transformation
Statistical physics
010306 general physics
0210 nano-technology
Subjects
Details
- ISSN :
- 10797114 and 00319007
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters
- Accession number :
- edsair.doi.dedup.....55f568ed3dec62541e18104da8b5b733