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首页> 外文期刊>Finite elements in analysis & design >A crystal plasticity based finite element framework for RVE calculations of two-phase materials: Void nucleation in dual-phase steels
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A crystal plasticity based finite element framework for RVE calculations of two-phase materials: Void nucleation in dual-phase steels

机译：基于晶体塑性的有限元框架，用于两相材料的rve计算：双相钢中的空隙成核

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摘要

A crystal plasticity based finite element (CPFE) framework is developed for performing representative volume element (RVE) calculations on two-phase materials. The present paper investigates the mechanical response and the evolution of microstructure of dual-phase (DP) steels under uniaxial tensile loading, with a special focus on void nucleation. The spatial distribution and morphology of the ferrite and martensite grains in DP steels are explicitly accounted for by generating three-dimensional RVEs with Voronoi tessellations. The effects of microstructural parameters-the volume fraction, morphology and spatial distribution of the martensite phase, and the grain size and orientation distribution of the ferrite phase-on the initiation and spread of localized plastic deformation (leading to void nucleation) are investigated in detail. The soft ferrite phase is modelled by a local crystal plasticity theory with anisotropic elasticity, and the hard martensite phase by the J2 flow theory with isotropic elasticity. The developed CPFE framework successfully predicts both the overall and the local mechanical response, and is perfectly capable of distinguishing between different void nucleation mechanisms experimentally observed for DP steels.
机译：基于晶体可塑性的有限元（CPFE）框架用于对两相材料进行代表体积元素（RVE）计算。本文研究了单轴拉伸下双相（DP）钢微观结构的机械响应和演化，特别关注空隙成核。通过使用voronoi曲面细分的三维圆形来明确地解释了DP钢中铁素体和马氏体谷物的空间分布和形态。微观结构参数的影响 - 马氏体相位的体积分数，形态和空间分布，以及铁氧体相位对局部化塑性变形的启动和扩散的晶粒尺寸和取向分布（导致核成核）进行了详细研究。软铁素体相由具有各向异性弹性的局部晶体塑性理论建模，J2流动理论具有各向同性弹性的硬马氏体相。开发的CPFE框架成功地预测了整体和本地机械响应，并且能够区分对DP钢的实验观察的不同无效核切割机制。

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