标题： 无定形固体在振荡剪切下的屈服转变的随机钉扎效应 显示英文标题

标题： Effect of Random Pinning on the Yielding Transition of Amorphous Solid under Oscillatory Shear

摘要： 我们通过广泛的计算机模拟，研究了随机固定对振荡剪切下屈服转变的影响，其中我们冻结了一部分随机选择粒子的弛豫自由度。 使用Kob-Anderson模型作为我们的玻璃形成体，我们固定了一部分粒子。 这些固定粒子在施加的振荡剪切变形下可以发生仿射运动，但由于塑性事件后的重新排列被禁止而无法弛豫。 随着固定粒子的比例增加，系统从脆弱玻璃形成体转变为强玻璃形成体。 这为我们提供了检查脆性变化如何影响屈服转变的机会。 我们的结果表明，在随机固定下，强玻璃形成体和脆弱玻璃形成体的屈服转变存在显著差异。 这与之前在软球模型中通过改变堆积分数来改变脆性的观察结果一致，尽管主要区别在于随机固定显著抑制了剪切带的形成，甚至在良好退火的玻璃样品中也是如此。 显示英文摘要

摘要： We investigate the effects of random pinning, where we freeze the relaxation degrees of freedom for a fraction of randomly selected particles, on the yielding transition under oscillatory shear through extensive computer simulations. Using Kob-Anderson model as our model glass former, we pin a fraction of the particles. These pinned particles can move affinely under the imposed oscillatory shear deformation but are not allowed to relax through subsequent rearrangements due to plastic events. As the fraction of pinned particles increases, the system transitions from being a fragile glass former to a strong glass former. This gives us opportunity to examine how changes in fragility impact the yielding transition. Our results demonstrate notable differences in the yielding transition between strong and fragile glass formers under random pinning. This aligns with previous observations where fragility was altered by changing the packing fraction in soft sphere model albeit with a main difference that random pinning significantly suppresses the formation of shear bands, even in well-annealed glass samples.