三维多晶塑性模拟中的晶粒尺寸效应和最薄弱环节理论

IF 1.3 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Comptes Rendus Physique Pub Date : 2021-03-26 DOI:10.5802/CRPHYS.53

L. Gélébart

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引用次数: 2

摘要

将最薄弱环节理论引入到多晶的三维数值模拟中，该理论有时被用于分析尺寸对单晶塑性行为的影响。该方法依赖于源在空间中的随机分布以及与晶体塑性定律相关的强度，该定律具有恒定的每层临界分解剪切应力(CRSS)。它能够再现:(1)霍尔-佩奇定律给出的屈服应力对晶粒尺寸的依赖关系;(2)在晶粒表面经常观察到的强烈的滑移带局部化模式，特别是在淬火或辐照金属中，但难以通过数值模拟再现。

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Grain size effects and weakest link theory in 3D crystal plasticity simulations of polycrystals

The weakest link theory, sometimes proposed to analyze size effects on the plastic behaviour of single crystals, is introduced in 3D numerical simulations of polycrystals. The approach relies on a random distribution of sources in space and strength associated to a crystal plasticity law with constant per layer Critical Resolved Shear Stresses (CRSS). It is able to reproduce: (1) the grain size dependence of the yield stress given by the Hall–Petch law, (2) intense slip band localization patterns as often observed at the grains surface, especially pronounced in quenched or irradiated metals, but difficult to reproduce by numerical simulation.

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来源期刊

Comptes Rendus Physique 物理-天文与天体物理

CiteScore

2.80

自引率

0.00%

发文量

审稿时长

17.2 weeks

期刊介绍： The Comptes Rendus - Physique are an open acess and peer-reviewed electronic scientific journal publishing original research article. It is one of seven journals published by the Académie des sciences. Its objective is to enable researchers to quickly share their work with the international scientific community. The Comptes Rendus - Physique also publish journal articles, thematic issues and articles on the history of the Académie des sciences and its current scientific activity. From 2020 onwards, the journal''s policy is based on a diamond open access model: no fees are charged to authors to publish or to readers to access articles. Thus, articles are accessible immediately, free of charge and permanently after publication. The Comptes Rendus - Physique (8 issues per year) cover all fields of physics and astrophysics and propose dossiers. Thanks to this formula, readers of physics and astrophysics will find, in each issue, the presentation of a subject in particularly rapid development. The authors are chosen from among the most active researchers in the field and each file is coordinated by a guest editor, ensuring that the most recent and significant results are taken into account. In order to preserve the historical purpose of the Comptes Rendus, these issues also leave room for the usual notes and clarifications. The articles are written mainly in English.