The mechanical nonlinear response of dense Brownian suspensions of polymer gel particles is studied experimentally and by means of numerical simulations. It is shown that the response to the application of a constant shear rate depends on the previous history of the suspension. When the flow starts from a suspension at rest, it exhibits an elastic response followed by a stress overshoot and then a plastic flow regime. Conversely, after flow reversal, the stress overshoot does not occur, and the apparent elastic modulus is reduced while numerical simulations reveal that the anisotropy of the local microstructure is delayed relative to the macroscopic stress.

中文翻译：

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剪切致密胶体悬浮液中的应力过冲、滞后和包辛格效应

通过实验和数值模拟研究了聚合物凝胶颗粒的致密布朗悬浮液的机械非线性响应。结果表明，对应用恒定剪切速率的响应取决于悬浮液的先前历史。当流动从静止的悬浮液开始时，它表现出弹性响应，然后是应力过冲，然后是塑性流动状态。相反，在流动反转后，不会发生应力超调，表观弹性模量降低，而数值模拟表明局部微观结构的各向异性相对于宏观应力有所延迟。