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arXiv 1807.06386cond-mat.stat-mechcond-mat.mtrl-sci
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压缩失效作为一个临界转变:实验证据和映射到脱钉普适类

Compressive failure as a critical transition: Experimental evidences and mapping onto the universality class of depinning

Chi-Cong Vu, David Amitrano, Olivier Plé, Jérôme Weiss

摘要:

声发射(AE)的测量过程中进行的压缩加载的混凝土样品与三种不同的微观结构(骨料尺寸和孔隙度)和四个样本大小显示,故障之前的断裂事件,AE能量和故障附近的持续时间的幂律分布的速率的加速,和发散的断裂相关长度和时间走向失败。这表明无序材料的压缩失效是完整状态和失效状态之间的关键过渡。相关的临界指数被认为是独立的样品尺寸和微观结构的无序和接近平均场脱钉值。虽然压缩故障不同于经典的脱钉在几个方面,包括弹性再分布内核的性质,这两个过程之间的类比允许推导(有限)大小的强度,匹配我们广泛的数据集的影响。这种对失败的批判性解释也可能在自然灾害预测方面产生重要影响,如火山爆发,山体滑坡或悬崖崩塌。

英文摘要:

Acoustic emission (AE) measurements performed during the compressive loading of concrete samples with three different microstructures (aggregate sizes and porosity) and four sample sizes revealed that failure is preceded by an acceleration of the rate of fracturing events, power law distributions of AE energies and durations near failure, and a divergence of the fracturing correlation length and time towards failure. This argues for an interpretation of compressive failure of disordered materials as a critical transition between an intact and a failed state. The associated critical exponents were found to be independent of sample size and microstructural disorder and close to mean-field depinning values. Although compressive failure differs from classical depinning in several respects, including the nature of the elastic redistribution kernel, an analogy between the two processes allows deriving (finite)-sizing effects on strength that match our extensive dataset. This critical interpretation of failure may have also important consequences in terms of natural hazards forecasting, such as volcanic eruptions, landslides, or cliff collapses.

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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