Bhaumik Himangsu, Foffi Giuseppe, Sastry Srikanth
Jawaharlal Nehru Center for Advanced Scientific Research, Jakkur Campus, Bengaluru 560064, India.
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France.
Phys Rev Lett. 2022 Mar 4;128(9):098001. doi: 10.1103/PhysRevLett.128.098001.
We investigate avalanches and clusters associated with plastic rearrangements and the nature of structural change in the prototypical strong glass, silica, computationally. We perform a detailed analysis of avalanches, and of spatially disconnected clusters that constitute them, for a wide range of system sizes. Although qualitative aspects of yielding in silica are similar to other glasses, the statistics of clusters exhibits significant differences, which we associate with differences in local structure. Across the yielding transition, anomalous structural change and densification, associated with a suppression of tetrahedral order, is observed to accompany strain localization.
我们通过计算研究了与塑性重排相关的雪崩和团簇，以及典型的强玻璃——二氧化硅中的结构变化性质。我们对各种系统尺寸下的雪崩以及构成它们的空间不相连团簇进行了详细分析。尽管二氧化硅屈服的定性方面与其他玻璃相似，但团簇的统计数据显示出显著差异，我们将其与局部结构的差异联系起来。在屈服转变过程中，观察到与四面体有序性抑制相关的异常结构变化和致密化伴随着应变局部化。
