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首页> 外文期刊>Journal of the Mechanics and Physics of Solids >A dislocation density based crystal plasticity finite element model: Application to a two-phase polycrystalline HCP/BCC composites
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A dislocation density based crystal plasticity finite element model: Application to a two-phase polycrystalline HCP/BCC composites

机译：基于位错密度的晶体可塑性有限元模型：在两相HCP / BCC复合材料中的应用

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摘要

We present a multiscale model for anisotropic, elasto-plastic, rate- and temperature-sensitive deformation of polycrystalline aggregates to large plastic strains. The model accounts for a dislocation-based hardening law for multiple slip modes and links a single-crystal to a polycrystalline response using a crystal plasticity finite element based homogenization. It is capable of predicting local stress and strain fields based on evolving microstructure including the explicit evolution of dislocation density and crystallographic grain reorientation. We apply the model to simulate monotonic mechanical response of a hexagonal close-packed metal, zirconium (Zr), and a body-centered cubic metal, niobium (Nb), and study the texture evolution and deformation mechanisms in a two-phase Zr/Nb layered composite under severe plastic deformation. The model predicts well the texture in both co-deforming phases to very large plastic strains. In addition, it offers insights into the active slip systems underlying texture evolution, indicating that the observed textures develop by a combination of prismatic, pyramidal, and anomalous basal slip in Zr and primarily {110}<111> slip and secondly {112}<111> slip in Nb.
机译：我们为各向异性，弹塑性，速率和温度敏感的多晶聚集体向大塑性应变变形提出了一种多尺度模型。该模型考虑了多种滑模的基于位错的硬化定律，并使用基于晶体可塑性有限元的均质化将单晶与多晶响应联系起来。它能够基于不断发展的微观结构（包括位错密度的显着演变和晶体学晶粒的重新定向）来预测局部应力和应变场。我们将该模型应用于模拟六方密堆积金属锆（Zr）和体心立方金属铌（Nb）的单调机械响应，并研究了两相Zr /中的织构演化和变形机理Nb层状复合材料在严重塑性变形下。该模型可以很好地预测两个共变形阶段中非常大的塑性应变的织构。此外，它还提供了深入了解纹理演化的活动滑移系统的信息，表明所观察到的纹理是由Zr中棱柱形，金字塔形和反常基底滑移（主要是{110} <111>滑移，其次是{112} < 111>滑入Nb。

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