Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, 14109 Berlin, Germany.
Phys Rev Lett. 2013 May 24;110(21):215701. doi: 10.1103/PhysRevLett.110.215701.
The history dependence of glasses formed from flow-melted steady states by a sudden cessation of the shear rate γ[over ˙] is studied in colloidal suspensions, by molecular dynamics simulations and by mode-coupling theory. In an ideal glass, stresses relax only partially, leaving behind a finite persistent residual stress. For intermediate times, relaxation curves scale as a function of γ[over ˙]t, even though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The theory describes this history dependence of glasses sharing the same thermodynamic state variables but differing static properties.
通过分子动力学模拟和模式耦合理论研究了在胶体悬浮液中由剪切速率γ[over ˙]的突然停止而从流动熔融稳定态形成的玻璃的历史依赖性。在理想玻璃中，应力仅部分松弛，留下有限的持久残余应力。对于中间时间，即使没有流动，弛豫曲线也会作为γ[over ˙]t 的函数进行缩放。宏观应力演化与微观均方位移显示的残余液化的长度尺度相关。该理论描述了具有相同热力学状态变量但具有不同静态特性的玻璃的这种历史依赖性。
