arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.0299cond-mat.soft
收藏

软玻璃材料中的动态交叉长度

Dynamic crossover length in soft-glassy materials

R. Benzi, M. Bernaschi, M. Sbragaglia, S. Succi

摘要:

基于介观尺度模拟的二元混合物具有非常低的表面张力和积极的分离压力(挫折),我们测量的相关长度的应力场内的流动混合物,作为一个函数的频率施加的负载。两个标度制度被清楚地确定,与尖锐的液体和固体区域之间的交叉,与指数-1/2和-1,分别。交叉相关长度被证明是密切相关的密度场,其集体动力学的相干激发的典型规模被证明是负责非平凡的流变效应,包括屈服应力的出现。

英文摘要:

Based upon mesoscale simulations of binary mixtures with very low surface tension and positive disjoining pressure (frustration), we measure the correlation length of the stress field within the flowing mixture, as a function of the frequency of the applied load. Two scaling regimes are clearly identified, with a sharp crossover between the liquid and solid regions, with exponent -1/2 and -1, respectively. The crossover correlation length is shown to be closely connected to the typical scale of the coherent excitations of the density field, whose collective dynamics is shown to be responsible for non-trivial rheological effects including the emergence of yield stress.

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。

↑