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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Crystal plasticity-based micromechanical finite element modelling of ductile void growth for an aluminium alloy under multiaxial loading conditions
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Crystal plasticity-based micromechanical finite element modelling of ductile void growth for an aluminium alloy under multiaxial loading conditions

机译：基于晶体塑性的铝合金在多轴载荷条件下延性空洞生长的微机械有限元建模

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摘要

This work proposes a crystal plasticity-based micromechanical finite element model to account for the inelastic crystallographic slip in an aluminium alloy and its effect on the development of micro-voids. Three-dimensional unit cell with periodic boundary conditions is used to represent the porous single crystal, which is subject to multiaxial external loads with constant stress triaxiality. The effects of stress triaxiality and crystallographic orientation on the ductile failure response for the porous single crystal are then quantified. Through the Taylor-Reuss mean field homogenisation, the stress-strain responses for porous polycrystal under multiaxial stress states are also investigated and compared with the conventional modelling results. The present work indicates that void coalescence strain at single crystal level strongly depends on the crystallographic orientation, particularly when stress triaxiality is low, and the overall stress-strain response of porous polycrystal can be affected by the crystallographic slip-based micro-void growth and polycrystallinity of the material.
机译：这项工作提出了一种基于晶体可塑性的微机械有限元模型，以解释铝合金中的非弹性晶体滑移及其对微孔发展的影响。具有周期性边界条件的三维晶胞用于表示多孔单晶，该单晶要承受三轴恒定应力的多轴外部载荷。然后，定量分析了应力三轴性和晶体学取向对多孔单晶延性破坏响应的影响。通过Taylor-Reuss平均场均化，还研究了多孔多晶体在多轴应力状态下的应力应变响应，并将其与常规建模结果进行了比较。目前的工作表明，单晶水平的空洞聚结应变在很大程度上取决于晶体学的取向，特别是当应力三轴性较低时，多孔多晶的整体应力应变响应会受到基于晶体滑移的微孔生长和材料的多晶性。

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