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Dense supercooled colloidal melt in forward shear from a quiescent stateshows overshoot in shear stress at 10% strain with an unchanged fluid structureat equal stress before and after overshoot. In addition, we find overshoot innormal stress with a monotonic increase in osmotic pressure at an identicalstrain. The first and second normal stress become comparable in magnitude andopposite in sign. Functional dependence of the steady state stress and osmoticpressure with Peclet number demonstrate signature of crossover betweenNewtonian and nearly- Newtonian regime. Moreover, instantaneous shear reversalfrom steady state exhibit Bauschinger effect, where strong history dependenceis observed depending on the time of flow reversal. The distribution ofparticulate stress and osmotic pressure at the point of flow reversal is shownto be a signature of the subsequent response. We link the history dependence ofthe stress-strain curves to changes in the fluid structure measured through theangular components of the radial distribution function. A uniform compressionin transition from forward to reversed flowing state is found.

Stress-structure relation in dense colloidal melt under forward and instantaneous reversal of shear