摘要翻译:
我们讨论了玻璃形成系统中力学性能介于液体和固体之间的有趣的温度范围。我们用一种有效的Monte-Carlo方法计算了弹性模量,并证明了在该温度范围内,弹性模量在短时间内有限,在长时间内消失,其中“短”和“长”取决于温度。利用统计力学的一些精确结果,提出了一种利用分子动力学模拟计算剪切模量的新方法,并与Monte-Carlo方法进行了比较。最后的结论是,这些体系不是通常意义上的“粘性流体”,因为它们实际的时间依赖性连接了具有变化的局部剪切模量的类固体材料。
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英文标题:
《Mechanical Properties of Glass Forming Systems》
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作者:
Valery Ilyin, Nataliya Makedonska, Itamar Procaccia and Nurith
Schupper
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最新提交年份:
2007
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分类信息:
一级分类:Physics 物理学
二级分类:Statistical Mechanics 统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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一级分类:Physics 物理学
二级分类:Materials Science 材料科学
分类描述:Techniques, synthesis, characterization, structure. Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术,合成,表征,结构。结构相变,力学性质,声子。缺陷,吸附质,界面
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英文摘要:
We address the interesting temperature range of a glass forming system where the mechanical properties are intermediate between those of a liquid and a solid. We employ an efficient Monte-Carlo method to calculate the elastic moduli, and show that in this range of temperatures the moduli are finite for short times and vanish for long times, where `short' and `long' depend on the temperature. By invoking some exact results from statistical mechanics we offer an alternative method to compute shear moduli using Molecular Dynamics simulations, and compare those to the Monte-Carlo method. The final conclusion is that these systems are not "viscous fluids" in the usual sense, as their actual time-dependence concatenates solid-like materials with varying local shear moduli.
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PDF链接:
https://arxiv.org/pdf/705.1834


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