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arXiv 1301.4080cond-mat.softcond-mat.dis-nn
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玻璃局部弹性模量空间分布的测量

Measuring Spatial Distribution of Local Elastic Modulus in Glasses

Hideyuki Mizuno, Stefano Mossa, Jean-Louis Barrat

摘要:

玻璃表现出空间不均匀的弹性性质,这可以通过在局部尺度上测量其弹性模量来研究。在文献中已经提出了各种方法来评估局部弹性模量。第一种可能性是测量局部应力-局部应变曲线并从曲线的斜率获得局部弹性模量,或者等效地使用局部波动公式。另一种可能的途径是假设仿射应变,并使用所施加的全局应变而不是局部应变来计算局部模量。最近,第三种技术已经被引入,这是很容易实现,并具有低计算成本的优点。在这篇文章中,我们比较了这三种方法,使用相同的模型玻璃,并揭示了它们之间的差异所造成的非仿射变形。

英文摘要:

Glasses exhibit spatially inhomogeneous elastic properties, which can be investigated by measuring their elastic moduli at a local scale. Various methods to evaluate the local elastic modulus have been proposed in the literature. A first possibility is to measure the local stress-local strain curve and to obtain the local elastic modulus from the slope of the curve, or equivalently to use a local fluctuation formula. Another possible route is to assume an affine strain and to use the applied global strain instead of the local strain for the calculation of the local modulus. Most recently a third technique has been introduced, which is easy to be implemented and has the advantage of low computational cost. In this contribution, we compare these three approaches by using the same model glass and reveal the differences among them caused by the non-affine deformations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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