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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2008.00970cond-mat.soft
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拉伸下polymer链条的疲劳和失效

Fatigue and failure of a polymer chain under tension

Harish Charan, Alex Hansen, H. G. E. Hentschel, Itamar Procaccia

摘要:

保持在温度$T$和固定张力下的聚合物链的断裂对于在恒定外部应变和随机扰动下失效的广泛系统是典型的。过去的研究集中在分析和数值研究的平均崩溃率这样的链。令人惊讶的是,似乎缺乏崩溃率的概率分布函数(PDF)的分析计算。由于罕见的快速坍缩事件可能是重要的,甚至是灾难性的,我们在这里提出了一个理论,这种分布,其尾部的压力快率。我们表明,尾部的PDF是一个幂律与{ \em普遍}指数,理论上确定的。大量的数值验证了所提供的理论。吸取了与同类其他问题有关的经验教训。

英文摘要:

The rupture of a polymer chain maintained at temperature $T$ under fixed tension is prototypical to a wide array of systems failing under constant external strain and random perturbations. Past research focused on analytic and numerical studies of the mean rate of collapse of such a chain. Surprisingly, an analytic calculation of the probability distribution function (PDF) of collapse rates appears to be lacking. Since rare events of rapid collapse can be important and even catastrophic, we present here a theory of this distribution, with a stress on its tail of fast rates. We show that the tail of the PDF is a power law with a {\em universal} exponent that is theoretically determined. Extensive numerics validate the offered theory. Lessons pertaining to other problems of the same type are drawn.

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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