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arXiv 2602.09737cond-mat.mtrl-scicond-mat.softcond-mat.stat-mechphysics.app-ph
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几何如何在晶格断裂中抑制无序

How Geometry Tames Disorder in Lattice Fracture

University of Edinburgh(爱丁堡大学);University College London(伦敦大学学院);ETH Zurich(苏黎世联邦理工学院)

Matthaios Chouzouris, Leo de Waal, Antoine Sanner, Alessandra Lingua, David S. Kammer, Marcelo A. Dias

AI总结:

该研究通过几何参数调控晶格断裂中无序的表现,揭示了Weibull模量和细长比对断裂行为的影响,并挑战了传统增韧机制的解释。

摘要:

我们研究了具有元件失效应力来自Weibull分布的预裂三角梁状晶格的断裂行为。通过统计分析和数值模拟,我们识别并验证了三种不同的断裂阶段:(i) 无序被有效抑制,(ii) 无序在裂纹尖端附近局部表现,改变裂纹形态,(iii) 无序全局表现,导致初始模糊断裂。我们的模型自然揭示了支配这种行为的关键参数:Weibull模量,量化失效阈值的分布范围,以及一个称为细长比的几何量。我们还再现了之前实验和数值研究中报道的无序诱导增韧现象,进一步表明其表现取决于无序的非单调关系。关键的是,我们的结果表明,这种增韧不能简单地与晶格中的损伤量联系起来,挑战了将增加的断裂能仅归因于增强的裂纹曲折性或模糊断裂的解释。总体而言,我们的结果确立了几何作为调节梁状晶格断裂过程中无序表现的强大控制参数,对工程材料中无序诱导增韧有更广泛的意义。

英文摘要:

We investigate the fracture behavior of pre-cracked triangular beam-lattices whose elements have failure stresses drawn from a Weibull distribution. Through a statistical analysis and numerical simulations, we identify and verify the existence of three distinct failure regimes: (i) disorder is effectively suppressed, (ii) disorder manifests locally near the crack tip, modifying the crack morphology, and (iii) disorder manifests globally, leading to initially diffuse failure. Our model naturally reveals the key parameters governing this behavior: the Weibull modulus, quantifying the spread in failure thresholds, and a geometric quantity termed the Slenderness Ratio. We also reproduce the disorder-induced toughening reported in previous experimental and numerical studies, further demonstrating that its manifestation depends non-monotonically on disorder. Crucially, our results indicate that this toughening cannot be simply connected to the amount of damage in the lattice, challenging interpretations that attribute increased fracture energy solely to enhanced crack tortuosity or diffuse failure. Overall, our results establish geometry as a powerful control parameter for regulating how disorder is expressed during fracture in beam-lattices, with broader implications for the disorder-induced toughening in engineered materials.

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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