离散位错动力学模拟FCC多晶晶内塑性变形局部化

IF 1.9 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Modelling and Simulation in Materials Science and Engineering Pub Date : 2023-11-10 DOI:10.1088/1361-651x/ad02b0

Baptiste Joste, Benoit Devincre, Riccardo Gatti, Henry Proudhon

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引用次数: 0

摘要

摘要采用离散位错动力学(DDDs)模拟方法研究了多晶中应变局部化机制。首先，采用弹性有限元法模拟计算了与晶粒间应变不相容相关的晶内应力分布。测试了许多配置以评估应力非均质性，并构成了DDD模拟的数据库。通过对这些微观组织的分析，提出了一种识别最可能出现局部变形的晶粒的准则。然后，采用DDD模拟方法探讨了晶粒尺度上的塑性应变局部化现象。这些模拟结果表明，靠近多晶四节点的应力集中对塑性应变局部化起着重要作用。这项工作为未来的研究铺平了道路，这要感谢关于滑移带起始和应变松弛现象的DDD模拟。

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Simulation of intragranular plastic deformation localization in FCC polycrystals by Discrete Dislocation Dynamics

Abstract Strain localization mechanisms taking place in polycrystal grains are investigated using Discrete Dislocation Dynamics (DDDs) simulations. First, elastic Finite Element Method simulations are used to calculate the intragranular stress distribution linked to strain incompatibilities between grains. Many configurations are tested to evaluate the stress heterogeneity and constitute a database for DDD simulations. From the analysis of these microstructures, a criterion is proposed to identify the grains where the emergence of the localization of the deformation is the most likely. Then, DDD simulations are used to explore the plastic strain localization phenomenon at the grain scale. Those simulations show that stress concentrations close to a polycrystal quadruple node can play a fundamental role in plastic strain localization. This work paves the way for future investigations to be made thanks to DDD simulations regarding slip band initiation and strain relaxation phenomena.

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来源期刊

Modelling and Simulation in Materials Science and Engineering 工程技术-材料科学：综合

CiteScore

3.30

自引率

5.60%

发文量

审稿时长

1.7 months

期刊介绍： Serving the multidisciplinary materials community, the journal aims to publish new research work that advances the understanding and prediction of material behaviour at scales from atomistic to macroscopic through modelling and simulation. Subject coverage: Modelling and/or simulation across materials science that emphasizes fundamental materials issues advancing the understanding and prediction of material behaviour. Interdisciplinary research that tackles challenging and complex materials problems where the governing phenomena may span different scales of materials behaviour, with an emphasis on the development of quantitative approaches to explain and predict experimental observations. Material processing that advances the fundamental materials science and engineering underpinning the connection between processing and properties. Covering all classes of materials, and mechanical, microstructural, electronic, chemical, biological, and optical properties.