CNISM, Second University of Naples, 81031 Aversa (CE), Italy.
Phys Rev Lett. 2009 Dec 4;103(23):235701. doi: 10.1103/PhysRevLett.103.235701.
Shear stress, as temperature, induces particle motion, and affects the jamming transition from a fluid to a disordered solid state. Here, we show that at finite shear stress, the jamming transition is characterized by the presence of hysteresis, as in a given range of control parameters a flowing or a jammed state can be found, depending on whether the system is prepared coming from the fluid or the jammed phase. At small shear stress, where the hysteresis is negligible, the jamming transition has a mixed first-order second-order character close to that found at the glass transition of thermal systems, with discontinuities in the asymptotic values of two time quantities such as the self-intermediate scattering function.
剪切应力，如同温度一样，会引起颗粒运动，并影响从流体到无序固态的堵塞转变。在这里，我们表明，在有限的剪切应力下，堵塞转变的特征是存在滞后现象，因为在给定的控制参数范围内，可以找到流动或堵塞状态，这取决于系统是从流体相还是堵塞相制备而来。在较小的剪切应力下，滞后现象可以忽略不计，堵塞转变具有混合的一级到二级特征，接近于热系统玻璃化转变时的特征，两个时间量的渐近值（如自中间散射函数）存在不连续性。
