论文标题
剪切致密的胶体悬浮液中的应力超出，滞后和鲍申格效应
Stress overshoot, hysteresis and Bauschinger effect in sheared dense colloidal suspensions
论文作者
论文摘要
通过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，对恒定剪切速率应用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，它会表现出弹性响应，然后应力过冲，然后是塑性流程。相反，在流动逆转后，不发生应力过冲，并且降低了明显的弹性模量，而数值模拟显示，相对于宏观应力，局部微结构的各向异性延迟。
The mechanical non-linear 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.
