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 postyielding 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. * mlaurati@fisica.ugto.mx arXiv:1709.05570v1 [cond-mat.soft]
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