Application and development of numerical simulation on mesoscopic analysis of powder compaction
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摘要:
数值模拟技术已经成为研究粉末压制过程的重要手段。研究人员运用离散单元法（discrete element method，DEM）从细观角度研究粉末颗粒的力学行为，分析力链特性及力链演化过程，揭示细观结构对宏观性质的影响；使用多粒子有限元法（multi-particle finite element method，MPFEM）从颗粒层面对不同粉末的压制变形机理进行研究。本文对离散单元法和多粒子有限元法两种数值模拟方法在粉末压制中的应用及发展进行综述，总结了多粒子有限元法在粉末压制数值模拟中的难点，分析得到在动态载作用下对粉末力链演化规律及颗粒致密机理的研究可作为未来探索方向的展望。
Abstract:In recent years, numerical simulation technology has become an important method to study the powder compaction process. The discrete element method (DEM) is used to study the mechanical behavior of powder particles from the mesoscopic perspective, analyze the characteristics and evolution process of force chain, and reveal the influence of the mesoscopic structure on the macroscopic properties. The multi-particle finite element method (MPFEM) is used to study the compression deformation mechanisms of the different powders at the particle level. The application and development of DEM and MPFEM on the powder compaction were reviewed in this paper, and the difficulties of MPFEM used in powder compaction were summarized.It was concluded that the study on the evolution law of powder force chain and the mechanism of particle densification under the dynamic loading could be regarded as a prospect for future exploration
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