Abstract This paper presents a multi-scale modelling framework to evaluate the structure-property relationship of metallic materials fabricated by powder-bed additive manufacturing (AM) technique based on crystal plasticity finite element methods. In this framework, a new synthetic microstructure generation approach is proposed to reconstruct micro-scale models of AMed metals according to the characteristics of grain growth in the fabrication process. The constitutive relation of individual grains in the micro-scale reconstructed models is described with the single-crystal-scale plasticity model. Meanwhile, to reduce the computational cost, a polycrystal-scale plasticity model is also established. The homogeneous elastic moduli tensor is computed according to Mori-Tanaka's theory, while the plastic deformation is described by the equivalent grain set. The proposed multi-scale modelling framework is validated against experiments, where the as-built Ti-6Al-4V samples fabricated by selective laser melting (SLM) are tested under uniaxial tensile, compressive, and cyclic loadings. The presented experimental and computational study demonstrates the capability of the proposed multi-scale modelling framework in the structure-property analysis of AMed metals.

中文翻译：

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增材制造金属材料结构-性能关系的多尺度建模

摘要 本文提出了一种多尺度建模框架，用于评估基于晶体塑性有限元方法的粉末床增材制造（AM）技术制造的金属材料的结构-性能关系。在此框架中，提出了一种新的合成微结构生成方法，根据制造过程中晶粒生长的特征重建 AMed 金属的微观模型。微尺度重构模型中单个晶粒的本构关系用单晶尺度塑性模型来描述。同时，为了降低计算成本，还建立了多晶尺度的塑性模型。根据 Mori-Tanaka 的理论计算均匀弹性模量张量，而塑性变形由等效晶粒集描述。所提出的多尺度建模框架经过实验验证，其中通过选择性激光熔化 (SLM) 制造的竣工 Ti-6Al-4V 样品在单轴拉伸、压缩和循环载荷下进行测试。所提出的实验和计算研究证明了所提出的多尺度建模框架在 AMed 金属的结构特性分析中的能力。