Journal
RHEOLOGICA ACTA
Volume 61, Issue 6, Pages 355-371Publisher
SPRINGER
DOI: 10.1007/s00397-022-01337-0
Keywords
Shear banding; Thixotropy; Creep; Physical aging
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In this study, we investigate the start-up dynamics of aging soft materials under a stress-controlled flow field. We find that the system can undergo structural arrest and shear banding, even when the applied stress is greater than the minimum value associated with the flow curve.
We investigate the start-up dynamics under a stress-controlled flow field in aging soft materials, with the aid of an inelastic structural-kinetic model that exhibits non-monotonic steady-state shear stress-shear rate flow curve. In particular, we focus on the occurrence of both transient and steady-state shear banding in such systems. We find that even when the applied stress is greater than the minimum value of the stress associated with the non-monotonic flow curve, the system could eventually undergo structural arrest, resulting in a complete stoppage of flow. For further increase in stress, the system progressively shows transient shear banding as well as apparent steady-state shear banding. At sufficiently high shear stresses, the model shows an eventual homogeneous steady state. We delineate the effects of inertia and waiting time on the transient and apparent steady-state shear banding.
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