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arXiv cond-mat/0405437cond-mat.stat-mech
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混合模光纤束模型中的交越行为

Crossover behavior in a mixed mode fiber bundle model

Srutarshi Pradhan, Bikas K. Chakrabarti, Alex Hansen

摘要:

在光纤束模型中引入了一种混合模式的负载分配方案。该模型在负载分担规则的两个极端条件下,精确地简化为等负载分担(ELS)和局部负载分担(LLS)模型。我们确定了两个不同的制度:a)ELS模式占主导地位的平均场制度和b)LLS模式占主导地位的短程制度。通过强度变化、雪崩统计、磁化率和弛豫时间变化、断裂纤维之间的相关性及其聚类分析的数值研究,探讨了交叉行为。通过分析簇大小分布的矩,我们找到了这些区域的交叉点。因此,即使在一维情况下,纤维束模型也表现出从平均场到短程相互作用的交叉行为。

英文摘要:

We introduce a mixed-mode load sharing scheme in fiber bundle model. This model reduces exactly to equal load sharing (ELS) and local load sharing (LLS) models at the two extreme conditions of the load sharing rule. We identify two distinct regimes: a) Mean-field regime where ELS mode dominates and b) short range regime dominated by LLS mode. The crossover behavior is explored through the numerical study of strength variation, the avalanche statistics, susceptibility and relaxation time variations, the correlations among the broken fibers and their cluster analysis. Analyzing the moments of the cluster size distributions we locate the crossover point of these regimes. We thus conclude that even in one dimension, fiber bundle model shows crossover behavior from mean-field to short range interactions.

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