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arXiv 1610.06804cond-mat.soft
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致密硬质球玻璃的剪切屈服和剪切堵塞

Shear yielding and shear jamming of dense hard sphere glasses

Pierfrancesco Urbani, Francesco Zamponi

摘要:

我们调查的致密硬球玻璃的剪切应变的响应,在很宽的范围内的压力范围从玻璃化转变到无限压力堵塞点。在密度剪切应变平面的相图解析计算使用平均场无限维的解决方案。我们发现,就在上述的玻璃化转变,玻璃一般产量在有限的剪切应变。在平均场图中,屈服转变是存在无序时的旋节点。相反,在较高的密度,我们发现,玻璃一般堵塞在有限的剪切应变:堵塞过渡防止屈服。剪切屈服线和剪切堵塞线在临界点处汇合,在该临界点附近,系统在非常大的剪切应力下屈服。在这一点上,一个高度非平凡的屈服动力学的特点是系统跨越无序骨折的预期。

英文摘要:

We investigate the response of dense hard sphere glasses to a shear strain, in a wide range of pressures ranging from the glass transition to the infinite-pressure jamming point. The phase diagram in the density-shear strain plane is calculated analytically using the mean field infinite dimensional solution. We find that just above the glass transition, the glass generically yields at a finite shear strain. The yielding transition, in the mean field picture, is a spinodal point in presence of disorder. At higher densities, instead, we find that the glass generically jams at a finite shear strain: the jamming transition prevents yielding. The shear yielding and shear jamming lines merge in a critical point, close to which the system yields at extremely large shear stress. Around this point, a highly non-trivial yielding dynamics characterized by system-spanning disordered fractures is expected.

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