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Investigation on the micro bending of metallic crystal by the non-local crystal plasticity finite element method

机译：非局部晶体塑性有限元法研究金属晶体微弯曲的研究

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A higher order dislocation density based crystal plasticity finite element method is adopted to investigate the deformation behaviours of metallic crystal during the process of micro bending,both statistically stored dislocations (SSDs) and geometrically necessary dislocations (GNDs) in each slip system are taken as the internal state variables.The combined effects of the microstructure heterogeneous,such as the orientation distribution of grains and dislocation density distribution,are described by means of the non-local model.Two models with different number of grains across the thickness are simulated,with the aim to investigate the evolutions and distributions of SSDs and GNDs,as well as the aggregation of GNDs in the neighbourhood of grain boundary.The calculated dislocation density distribution is compared with the micro hardness distribution obtained from the micro bending experiments.According to the results from the simulations and experiments,the strengthening effect of SSDs and GNDs during the micro bending are discussed,it is confirmed that the present physically based model gives an insight into the deformation mechanism and dislocation density evolution in the micro bending process.
机译：采用更高阶位错密度基晶体塑性有限元方法来研究微弯曲过程中金属晶体的变形行为，每个滑动系统中的统计储存的脱位（SSD）和几何必要的脱位（GNDS）被视为内部状态变量。通过非本地模型描述了微观结构异质的组合效应，例如晶粒和位错密度分布的取向分布。模拟厚度不同的晶粒数量不同的模型。旨在调查SSD和GND的演变和分布，以及GNDS在晶界附近的聚集。计算出的位错密度分布与从微弯曲实验获得的微硬度分布进行了比较。根据结果模拟和实验，SSD的强化效果讨论了在微弯曲期间的GNDS，证实目前物理基础的模型能够深入了解微弯曲过程中的变形机制和位错密度演化。

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