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|
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|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1122/1.5009199|
|Appare nelle tipologie:||01 - Articolo su periodico|