Olsson Peter, Teitel S
Department of Physics, Umeå University, 901 87 Umeå, Sweden.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Jul;88(1):010301. doi: 10.1103/PhysRevE.88.010301. Epub 2013 Jul 2.
Numerical simulations of soft-core frictionless disks in two dimensions are carried out to study the behavior of a simple liquid as a function of temperature T, packing fraction φ, and uniform applied shear strain rate γ[over ·]. Inferring the hard-core limit from our soft-core results, we find that it depends on the two parameters φ and T/γ[over ·]. Here T/γ[over ·]→0 defines the athermal limit in which a shear-driven jamming transition occurs at a well defined φ(J) and T/γ[over ·]→∞ defines the thermalized limit where an equilibrium glass transition may take place at φ(G). This conclusion argues that athermal jamming and equilibrium glassy behavior are not controlled by the same critical point. Preliminary results suggest φ(G)<φ(J).
对二维软核无摩擦圆盘进行了数值模拟，以研究一种简单液体的行为随温度T、堆积分数φ和均匀施加的剪切应变率γ̇的变化情况。从我们的软核结果推断硬核极限，我们发现它取决于两个参数φ和T/γ̇。这里T/γ̇→0定义了无热极限，在该极限下，在一个明确的φ(J)处发生剪切驱动的堵塞转变，而T/γ̇→∞定义了热化极限，在该极限下，在φ(G)处可能发生平衡玻璃化转变。这一结论表明，无热堵塞和平衡玻璃态行为不是由同一个临界点控制的。初步结果表明φ(G)<φ(J)。
