A well defined glass state obtained by oscillatory shear
Journal of Rheology
Society of Rheology
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Pérez-Ocampo, L., Zaccone, A., & Laurati, M. (2018). A well defined glass state obtained by oscillatory shear. Journal of Rheology, 62 (1), 197-207. https://doi.org/10.1122/1.5009199
We investigate the process of shear melting and re-solidification of a colloidal glass, directly after loading (pre-yielding) and after a series of consecutive strain sweeps (post-yielding). The post-yielding glass shows a significant softening compared to the pre-yielding glass, together with the absence of history effects in successive shear melting protocols, indicating a reproducible process of fluidisation and re-solidification into a glass state unaffected by residual stresses. However, a significant hysteresis characterises 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 neighbours.
External DOI: https://doi.org/10.1122/1.5009199
This record's URL: https://www.repository.cam.ac.uk/handle/1810/270528