具有可调吸引力的软堵塞材料中的非均匀剪切流
Inhomogeneous shear flows in soft jammed materials with tunable attractive forces
摘要：
我们进行分子动力学模拟，以表征发生在软堵塞材料的非均匀剪切流。我们使用粗糙的墙壁施加一个简单的剪切流和研究的非热运动的堵塞组件的软粒子，无论是纯粹的排斥相互作用，并在存在一个额外的短程吸引力的不同强度。在稳态下，当剪切速率变小时，所有系统都出现明显的流动不均匀性。偏离线性流动的幅度更大，并且当引力强度增加时，其寿命变得非常长，但与永久剪切带不同。流动不均匀性发生在由动态和静态屈服应力值限定的应力窗口中。吸引力增强了流动的不均匀性，因为它们加速应力松弛，从而有效地使系统更接近不均匀性最明显的屈服应力状态。目前的情况下，了解颗粒粘附剪切本地化的影响，这是基于详细的分子动力学模拟与现实的颗粒相互作用，定性不同于以前的定性解释和特设的理论建模。
英文摘要：
We perform molecular dynamics simulations to characterize the occurrence of inhomogeneous shear flows in soft jammed materials. We use rough walls to impose a simple shear flow and study the athermal motion of jammed assemblies of soft particles, both for purely repulsive interactions and in the presence of an additional short-range attraction of varying strength. In steady state, pronounced flow inhomogeneities emerge for all systems when the shear rate becomes small. Deviations from linear flow are stronger in magnitude and become very long-lived when the strength of the attraction increases, but differ from permanent shear-bands. Flow inhomogeneities occur in a stress window bounded by the dynamic and static yield stress values. Attractive forces enhance the flow heterogeneities because they accelerate stress relaxation, thus effectively moving the system closer to the yield stress regime where inhomogeneities are most pronounced. The present scenario for understanding the effect of particle adhesion on shear localization, which is based on detailed molecular dynamics simulations with realistic particle interactions, differs qualitatively from previous qualitative explanations and ad-hoc theoretical modelling.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
