Oscillatory athermal quasistatic deformation of a model glass.
Oscillatory athermal quasistatic deformation of a model glass.
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DOI：
10.1103/physreve.88.020301
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
D. Fiocco;G. Foffi;S. Sastry
中科院分区：
文献类型：
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作者：
D. Fiocco;G. Foffi;S. Sastry
我们报告了三维模型玻璃成型机致密非晶样品的振荡非热准静态剪切变形的计算机模拟。当变形幅度变化时，可以观察到动态转变：当振幅较大时，系统表现出扩散行为并失去对初始条件的记忆，而当振幅较小时，则观察到局部化。我们的结果表明，在驱动胶体系统中发现的相同类型的转变存在于非晶固体（例如，金属玻璃）的情况下。跃迁的开始与能量耗散的开始有关。对于大的系统尺寸，可以观察到剪切带，但不影响转变的质量方面。
We report computer simulations of oscillatory athermal quasistatic shear deformation of dense amorphous samples of a three-dimensional model glass former. A dynamical transition is observed as the amplitude of the deformation is varied: For large values of the amplitude the system exhibits diffusive behavior and loss of memory of the initial conditions, whereas localization is observed for small amplitudes. Our results suggest that the same kind of transition found in driven colloidal systems is present in the case of amorphous solids (e.g., metallic glasses). The onset of the transition is shown to be related to the onset of energy dissipation. Shear banding is observed for large system sizes, without, however, affecting qualitative aspects of the transition.