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arXiv 1710.04841cond-mat.softcond-mat.stat-mechphysics.comp-ph
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剪切小型玻璃成型系统:potential energy前景展望

Shearing small glass-forming systems: a potential energy landscape perspective

Markus Blank-Burian, Andreas Heuer

摘要:

众所周知,理解玻璃形成系统在剪切时的屈服是非常困难的,因为它是一种强烈的非平衡效应。在这里,我们表明的概念的势能景观(PEL),开发的静态,可以扩展到剪切。当引入一个适当的粗粒化的扩展PEL剪切系统,可以区分两种根本不同类型的塑性事件,即固有结构(IS)与最小化结构(MS)的转变。我们将这些概念应用于小系统的非循环和循环剪切,这使我们能够表征基本塑性事件的性质。尽管应力-应变曲线的一般性质与较大的系统相似,但更仔细的分析揭示了显着不同的性质。这使得人们能够识别较大系统中弹性联轴器的影响。MS的概念使我们能够将单个轨迹的应力过冲与MS转变的出现联系起来。此外,极限环的发生可以非常详细地描述小系统的特征,并且可以制定与PEL属性的连接。我们的小系统的宏观极限的结果可能产生的影响进行了讨论。

英文摘要:

Understanding the yielding of glass-forming systems upon shearing is notoriously difficult since it is a strong non-equilibrium effect. Here we show that the concept of the potential energy landscape (PEL), developed for the quiescent state, can be extended to shearing. When introducing an appropriate coarse graining of the extended PEL for sheared systems, one can distinguish two fundamentally different types of plastic events, namely inherent structures (IS) vs. minimized structure (MS) transitions. We apply these concepts to non-cyclic and cyclic shearing of small systems, which allow us to characterize the properties of elementary plastic events. Whereas the general properties of the stress-strain curves are similar to larger systems, a closer analysis reveals significantly different properties. This allows one to identify the impact of the elastic coupling in larger systems. The concept of MS enables us to relate the stress overshoot of a single trajectory to the emergence of an MS transition. Furthermore, the occurrence of limit cycles can be characterized in great detail for the small systems and connections to the properties of the PEL can be formulated. Possible implications of our small-system results for the macroscopic limit are discussed.

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