标题： 随机钉扎对非晶固体在振荡剪切下屈服转变的影响 显示英文标题

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

摘要： 我们研究了随机钉扎的影响，即对随机选择的粒子中的一部分冻结其弛豫自由度，在振荡剪切下对屈服转变的影响，通过广泛的计算机模拟。 使用Kob-Anderson模型作为我们的玻璃形成体，我们钉扎了一部分粒子。 这些被钉扎的粒子可以在施加的振荡剪切变形下进行仿射运动，但由于随后的塑性事件导致的重排而不能松弛。 随着被钉扎粒子的比例增加，系统从一种脆弱的玻璃形成体转变为一种强的玻璃形成体。 这使我们有机会检查脆性变化如何影响屈服转变。 我们的结果展示了在随机钉扎下强玻璃形成体和脆弱玻璃形成体之间的屈服转变存在显著差异。 这与之前的观察一致，其中通过改变软球模型中的堆积分数来改变脆性，尽管主要区别在于随机钉扎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.