Reversible plastic events during oscillatory deformation of amorphous solids.
Reversible plastic events during oscillatory deformation of amorphous solids.
复制标题
非晶固体振荡变形过程中的可逆塑性事件。
DOI：
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发表时间：
2015
影响因子：
2.4
通讯作者：
Nikolai V Priezjev
中科院分区：
文献类型：
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作者：
Nikolai V Priezjev
利用分子动力学模拟研究了振荡剪切应变对三维二元玻璃中单个粒子非仿射重排的影响。在远低于玻璃化转变的温度下，无定形材料由Kob-Andersen混合物表示。我们发现，在周期性的剪切变形的材料，一些粒子进行可逆的非仿射位移的振幅近似幂律分布。我们的模拟结果表明，粒子与大振幅的非仿射位移表现出集体行为，即，他们往往聚集成相对紧凑的集群，成为可比的屈服应变附近的系统大小。沿着可逆位移，还存在许多不可逆位移。随着应变幅的增加，在一个循环期间不可逆位移的概率增加，这导致材料的永久结构松弛。
The effect of oscillatory shear strain on nonaffine rearrangements of individual particles in a three-dimensional binary glass is investigated using molecular dynamics simulations. The amorphous material is represented by the Kob-Andersen mixture at the temperature well below the glass transition. We find that during periodic shear deformation of the material, some particles undergo reversible nonaffine displacements with amplitudes that are approximately power-law distributed. Our simulations show that particles with large amplitudes of nonaffine displacement exhibit a collective behavior; namely, they tend to aggregate into relatively compact clusters that become comparable with the system size near the yield strain. Along with reversible displacements there exist a number of irreversible ones. With increasing strain amplitude, the probability of irreversible displacements during one cycle increases, which leads to permanent structural relaxation of the material.