We investigate the process of shear melting and resolidification of a colloidal glass, directly after loading (preyielding) and after a series of consecutive strain sweeps (postyielding). The postyielding glass shows a significant softening compared with the preyielding glass, together with the absence of history effects in successive shear melting protocols, indicating a reproducible process of fluidisation and resolidification into a glass state unaffected by residual stresses. However, a significant hysteresis characterizes strain sweeps with increasing or decreasing strain amplitude. The appearance of history and hysteresis effects coincides with the formation of a glass state, whereas it is not observed in the liquid. We can describe the onset of shear melting over a broad range of volume fractions and frequencies using a recently developed model which describes the yielding process in terms of loss of long-lived nearest neighbors.
A well defined glass state obtained by oscillatory shear / L. Pérez-Ocampo, A. Zaccone, M. Laurati. - In: JOURNAL OF RHEOLOGY. - ISSN 0148-6055. - 62:1(2018 Jan 08), pp. 197-207.
Titolo: | A well defined glass state obtained by oscillatory shear |
Autori: | ZACCONE, ALESSIO (Penultimo) |
Settore Scientifico Disciplinare: | Settore FIS/03 - Fisica della Materia Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici |
Data di pubblicazione: | 8-gen-2018 |
Rivista: | |
Tipologia: | Article (author) |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1122/1.5009199 |
Appare nelle tipologie: | 01 - Articolo su periodico |
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