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Residual stresses in glasses

: Ballauff, M.


Physical review letters 110 (2013), Nr.21, Art. 215701
ISSN: 0031-9007
ISSN: 1079-7114
Fraunhofer ITWM ()

The history dependence of glasses formed from flow-melted steady states by a sudden cessation of the shear rate γ˙ is studied in colloidal suspensions, by molecular dynamics simulations and by mode-coupling theory. In an ideal glass, stresses relax only partially, leaving behind a finite persistent residual stress. For intermediate times, relaxation curves scale as a function of γt, even though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The theory describes this history dependence of glasses sharing the same thermodynamic state variables but differing static properties.