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arXiv 2204.06334cond-mat.stat-mech
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模拟非均匀材料中的裂纹扩展:格里菲斯定律、固有抗裂性和雪崩

Modeling crack propagation in heterogeneous materials: Griffith's law, intrinsic crack resistance and avalanches

Subhadeep Roy, Takahiro Hatano, Purusattam Ray

摘要:

固体中的各种非均匀性,包括原子的离散性,对断裂强度和破坏动力学都有显著的影响。在这里,我们研究的影响,在一个离散模型中的非均质材料的断裂,被称为纤维束模型的初始裂纹。我们发现三个不同的制度断裂动力学取决于初始裂纹尺寸。如果初始裂纹小于某一值,则不影响断裂动力学和临界应力。而对于较大的初始裂纹,裂纹的扩展导致整个系统的崩溃,和临界应力依赖于裂纹尺寸的幂律方式与一个非平凡的指数。该指数以及极限裂纹尺寸取决于系统中的非均匀性强度和应力松弛范围。

英文摘要:

Various kinds of heterogeneity in solids including atomistic discreteness affect the fracture strength as well as the failure dynamics remarkably. Here we study the effects of an initial crack in a discrete model for fracture in heterogeneous materials, known as the fiber bundle model. We find three distinct regimes for fracture dynamics depending on the initial crack size. If the initial crack is smaller than a certain value, it does not affect the rupture dynamics and the critical stress. While for a larger initial crack, the growth of the crack leads to a breakdown of the entire system, and the critical stress depends on the crack size in a power-law manner with a nontrivial exponent. The exponent, as well as the limiting crack size, depend on the strength of heterogeneity and the range of stress relaxation in the system.

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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