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首页> 外文会议>2003 TMS Annual Meeting Mar 2-6, 2003 San Diego, California >A FINITE ELEMENT MODEL FOR CRYSTAL PLASTICITY DURING LARGE DEFORMATION AND COMPARISON WITH EXPERIMENTAL MEASUREMENTS
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A FINITE ELEMENT MODEL FOR CRYSTAL PLASTICITY DURING LARGE DEFORMATION AND COMPARISON WITH EXPERIMENTAL MEASUREMENTS

机译：大变形过程中晶体塑性的有限元模型及与实验测量的比较

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摘要

A finite element-based macro/micro model formulation is presented for crystal plasticity during large deformation of metals. The model development is based on the updated Lagrangian approach for large plastic deformation, coupled with a micromechanical description of multisurface plastic flows associated with single crystals. Both the incremental objective stress time integration scheme and total formulation are incorporated. The macroscopic stress is linked to the microstructural behavior of crystals by tracking the motion of the active slip systems underlining the plastic deformation. The microscopic treatment entails a multi-surface-type stress update algorithm, which ensures the plastic deformation defined by each slip system to be on the yield surface. Numerical results are presented for both large strain deformations and plastic flow in single crystals. The results are compared with data available in literature.
机译：提出了一种基于有限元的宏观/微观模型公式，用于在金属大变形期间实现晶体可塑性。该模型的开发基于用于较大塑性变形的更新拉格朗日方法，并结合了与单晶相关的多表面塑性流动的微观力学描述。增量目标应力时间积分方案和总公式均被纳入。通过跟踪强调塑性变形的主动滑移系统的运动，宏观应力与晶体的微观结构行为相关联。微观处理需要采用多表面类型的应力更新算法，该算法可确保每个滑移系统定义的塑性变形位于屈服面上。给出了大应变变形和单晶塑性流动的数值结果。将结果与文献中的数据进行比较。

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