晶体塑性有限元方法在增材制造金属材料力学性能研究中的应用

Application and Progress of Crystal Plasticity Finite Element Method in the Study of Mechanical Properties in Metal Additive Manufacturing

增材制造作为先进制造技术的代表,已被广泛应用于航空航天等高新技术领域。金属增材制造技术的高能量密度、高热和快速冷却等复杂工艺特点使得成形件的微观结构与传统制造技术所得成形件显著不同,这对金属材料力学性能有着重要影响。晶体塑性有限元方法将晶体塑性理论与有限元方法相结合,能够跨尺度分析增材制造金属材料微观结构与力学性能之间的关系,为优化工艺过程提供支撑。本文综述了近年来晶体塑性有限元方法在金属增材制造中的应用,阐述了代表增材制造金属材料微观结构特征的几何模型的建立方法和有限元应用,提出了相关发展趋势。

Additive manufacturing,as a representative of advanced manufacturing technology,has been widely used in aerospaceand other high-tech fields.Due to the complex processes of high energy density,extreme heating and cooling rates in metal additive manufacturing technology,the microstructure of additively manufactured as-built materials is often obviously different from that produced by traditionally manufactured techno-logy,which has an important impact on the mechanical properties of metal materials.Crystal plasticity finite element method combines the crystal plasticity theory with the finite element method,which can research the relationship between the microstructure and mechanical properties of additively manufactured metallic materials across scales,and provide the strong support for the optimization of additive manufacturing processes.This paper first summarizes recent application of crystal plastic finite element method in metal additive manufacturing,and expounds the establishment method of geometric model,which can represent the microstructure characteristics of additively manufactured metallic materials,and the application of finite element method,finally points out the development trend.