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首页> 外文会议>World Congress on Integrated Computational Materials Engineering >DISLOCATION DENSITY BASED CRYSTAL PLASTICITY FINITE ELEMENT MODEL OF POLYCRYSTALS WITH GRAIN BOUNDARY EFFECT
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DISLOCATION DENSITY BASED CRYSTAL PLASTICITY FINITE ELEMENT MODEL OF POLYCRYSTALS WITH GRAIN BOUNDARY EFFECT

机译：基于位错的晶界效应多晶体晶体塑性有限元模型

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Grain boundaries play an important role in determining the mechanical properties of metallic materials. The impedance of dislocation motion at the boundary results in a strengthening mechanism. In addition, dislocations can pile-up, be transmitted or be absorbed by the grain boundaries based on the local stress state and grain boundary character. In this study, a dislocation density based crystal plasticity finite element model is applied to incorporate the interaction between the dislocations and the grain boundaries, and a simulation is conducted on polycrystalline alpha iron deformed to 12% in uniaxial tension. The results indicate that the geometrically necessary dislocation density is generally higher near the grain boundary than within the grain interior. Taylor factor mismatch sometimes reveals strong localization effects near the grain boundaries.
机译：晶界在确定金属材料的机械性能方面发挥着重要作用。边界处位错运动的阻抗导致强化机制。另外，基于局部应力状态和晶界特征，脱位可以堆叠，通过晶界传播或被纹理吸收。在该研究中，应用了位错密度基晶体塑性有限元模型以结合脱位和晶界之间的相互作用，并且在单轴张力中的多晶α铁上进行模拟。结果表明，几何必要的位错密度通常高于晶粒内部的晶界附近。泰勒因子不匹配有时会揭示谷物边界附近的强烈定位效应。

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