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arXiv 0807.4826cond-mat.stat-mech
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阈值分布中具有多个间断的随机纤维丛

A random fiber bundle with many discontinuities in the threshold distribution

Uma Divakaran, Amit Dutta

摘要:

研究了在阈值分布中具有$n$ -间断的随机纤维丛模型(RFBM)在全局载荷分担方案下的崩溃问题。换句话说,混合基于其阈值强度识别的$n+1$不同类别的纤维,使得$i-th$类别中的纤维的强度均匀地分布在值$σ_{2i-2}$和$σ_{2i-1}$之间,其中$1 \leq i \leq n+1$。此外,在$i-th$和$i+1-th$类之间的阈值分布中存在差距。我们表明,虽然临界应力取决于系统的参数值,临界指数是相同的RFBM的递归动力学与均匀分布和全球负载共享。另一方面,雪崩尺寸分布(ASD)对于较小的雪崩尺寸值显示出非普适的非幂律行为,其仅在接近临界分布时才变得突出。我们建立了一个任意的$n$的雪崩尺寸分布的行为是定性类似的RFBM与一个单一的不连续性的阈值分布($n=1$),特别是当密度和范围的阈值属于最强($n+1$)-th类的纤维在所有的情况下保持相同。

英文摘要:

We study the breakdown of a random fiber bundle model (RFBM) with $n$-discontinuities in the threshold distribution using the global load sharing scheme. In other words, $n+1$ different classes of fibers identified on the basis of their threshold strengths are mixed such that the strengths of the fibers in the $i-th$ class are uniformly distributed between the values $σ_{2i-2}$ and $σ_{2i-1}$ where $1 \leq i \leq n+1$. Moreover, there is a gap in the threshold distribution between $i-th$ and $i+1-th$ class. We show that although the critical stress depends on the parameter values of the system, the critical exponents are identical to that obtained in the recursive dynamics of a RFBM with a uniform distribution and global load sharing. The avalanche size distribution (ASD), on the other hand, shows a non-universal, non-power law behavior for smaller values of avalanche sizes which becomes prominent only when a critical distribution is approached. We establish that the behavior of the avalanche size distribution for an arbitrary $n$ is qualitatively similar to a RFBM with a single discontinuity in the threshold distribution ($n=1$), especially when the density and the range of threshold values of fibers belonging to strongest ($n+1$)-th class is kept identical in all the cases.

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