Low-strain fatigue in AISI 316L steel surface grains: a three-dimensional discrete dislocation dynamics modelling of the early cycles I. Dislocation microstructures and mechanical behaviour
Low-strain fatigue in AISI 316L steel surface grains: a three-dimensional discrete dislocation dynamics modelling of the early cycles I. Dislocation microstructures and mechanical behaviour
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DOI：
10.1080/14786430410001690051
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发表时间：
2004-08
影响因子：
1.6
通讯作者：
C. Déprés;C. Robertson;M. Fivel
中科院分区：
文献类型：
--
作者：
C. Déprés;C. Robertson;M. Fivel
采用三维离散位错动力学模型，分析了低应变疲劳中位错微观结构形成的早期阶段。在不同的加载幅度和晶粒尺寸的条件下进行了模拟。无论是位错微观结构和相关的机械行为准确地再现在单滑移，以及在双滑移加载条件。由此获得的显微组织进行了定量分析，在每个晶粒的滑移带的数量，带的厚度和带间距。模拟结果表明，交叉滑移的关键作用，无论是在粮食内部的应变的初始传播和随后的应变局部化的形式的滑移带。通过对位错排列的观察，提出了一个完整而详细的持久滑移带形成的方案。
The early stages of the formation of dislocation microstructures in low-strain fatigue are analysed, using three-dimensional discrete dislocation dynamics modelling. Simulations under various conditions of loading amplitude and grain size have been performed. Both the dislocation microstructures and the associated mechanical behaviour are accurately reproduced in single-slip as well as in double-slip loading conditions. The microstructures thus obtained are analysed quantitatively, in terms of number of slip bands per grain, band thickness and band spacing. The simulations show the crucial role of cross-slip both for the initial spreading of strain inside the grain and for the subsequent strain localization in the form of slip bands. A complete and detailed scheme for the persistent slip band formation is proposed, from the observation of the numerical dislocation arrangements.