Priezjev Nikolai V
Department of Mechanical and Materials Engineering, Wright State University, Dayton, Ohio 45435, USA.
Phys Rev E. 2017 Feb;95(2-1):023002. doi: 10.1103/PhysRevE.95.023002. Epub 2017 Feb 8.
Using molecular dynamics simulations, we study the transient response of a binary Lennard-Jones glass subjected to periodic shear deformation. The amorphous solid is modeled as a three-dimensional Kob-Andersen binary mixture at a low temperature. The cyclic loading is applied to slowly annealed, quiescent samples, which induces irreversible particle rearrangements at large strain amplitudes, leading to stress-strain hysteresis and a drift of the potential energy towards higher values. We find that the initial response to cyclic shear near the critical strain amplitude involves disconnected clusters of atoms with large nonaffine displacements. In contrast, the amplitude of shear stress oscillations decreases after a certain number of cycles, which is accompanied by the initiation and subsequent growth of a shear band.
通过分子动力学模拟，我们研究了二元 Lennard-Jones 玻璃在周期性剪切变形下的瞬态响应。该非晶固体被建模为低温下的三维 Kob-Andersen 二元混合物。循环加载应用于缓慢退火的静态样品，这在大应变幅度下会引起不可逆的颗粒重排，导致应力-应变滞后以及势能向更高值的漂移。我们发现，在临界应变幅度附近对循环剪切的初始响应涉及具有大非仿射位移的不相连原子团簇。相比之下，在一定数量的循环之后，剪切应力振荡的幅度会减小，这伴随着剪切带的起始和随后的生长。
