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arXiv 0804.2224cond-mat.mtrl-scicond-mat.stat-mech
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无序晶格模型的裂缝尺寸效应

Fracture size effects from disordered lattice models

Mikko J. Alava, Phani K. V. V. Nukala, Stefano Zapperi

摘要:

我们研究的尺寸效应在缺口无序样品断裂强度的数值模拟断裂的晶格模型。特别地,我们考虑了随机引信模型、随机弹簧模型和随机梁模型,它们都给出了类似的结果。这些使我们能够建立和理解由无序引起的统计效应控制的制度和由断裂力学控制的应力集中控制制度之间的交叉。交叉所描述的比例律,占断裂过程区的存在,我们量化平均超过几个无序配置的模型。该模型允许研究的断裂过程区的发展,随着负载的增加,并表示这方面的抗裂性(R曲线)。

英文摘要:

We study size effects in the fracture strength of notched disordered samples using numerical simulations of lattice models for fracture. In particular, we consider the random fuse model, the random spring model and the random beam model, which all give similar results. These allow us to establish and understand the crossover between a regime controlled by disorder-induced statistical effects and a stress-concentration controlled regime ruled by fracture mechanics. The crossover is described by a scaling law that accounts for the presence of fracture process zone which we quantify by averaging over several disordered configurations of the model. The models allow to study the development of the fracture process zone as the load is increased and to express this in terms of crack resistance (R-curve).

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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