Characterization of powder bed generation in electron beam additive manufacturing by discrete element method (DEM)

2017 ◽  
Vol 4 (11) ◽  
pp. 11437-11440 ◽  
Author(s):  
Yufan Zhao ◽  
Yuichiro Koizumi ◽  
Kenta Aoyagi ◽  
Kenta Yamanaka ◽  
Akihiko Chiba
Keyword(s):  
Electron Beam ◽  
Additive Manufacturing ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Powder Bed ◽  
Element Method

scholarly journals Discrete Element Method Analysis of the Spreading Mechanism and Its Influence on Powder Bed Characteristics in Additive Manufacturing

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 392
Author(s):  
Valerio Lampitella ◽  
Marco Trofa ◽  
Antonello Astarita ◽  
Gaetano D’Avino
Keyword(s):  
Additive Manufacturing ◽  
Discrete Element Method ◽  
Ad Hoc ◽  
Low Cost ◽  
Discrete Element ◽  
Spreading Process ◽  
Powder Bed ◽  
Physical Phenomena ◽  
Element Method

Laser powder bed fusion additive manufacturing is among the most used industrial processes, allowing for the production of customizable and geometrically complex parts at relatively low cost. Although different aspects of the powder spreading process have been investigated, questions remain on the process repeatability on the actual beam–powder bed interaction. Given the influence of the formed bed on the quality of the final part, understanding the spreading mechanism is crucial for process optimization. In this work, a Discrete Element Method (DEM) model of the spreading process is adopted to investigate the spreading process and underline the physical phenomena occurring. With parameters validated through ad hoc experiments, two spreading velocities, accounting for two different flow regimes, are simulated. The powder distribution in both the accumulation and deposition zone is investigated. Attention is placed on how density, effective layer thickness, and particle size distribution vary throughout the powder bed. The physical mechanism leading to the observed characteristics is discussed, effectively defining the window for the process parameters.

Recent Developments of the Multiphysics Discrete Element Method for Additive Manufacturing Modeling and Simulation

2017 ◽  
Author(s):  
John C. Steuben ◽  
Athanasios P. Iliopoulos ◽  
John G. Michopoulos
Keyword(s):  
Additive Manufacturing ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Additive Manufacture ◽  
Computational Tools ◽  
Computational Performance ◽  
Macro Scale ◽  
Recent Developments ◽  
Am Processes ◽  
Element Method

Recent years have seen a sharp increase in the development and usage of Additive Manufacturing (AM) technologies for a broad range of scientific and industrial purposes. The drastic microstructural differences between materials produced via AM and conventional methods has motivated the development of computational tools that model and simulate AM processes in order to facilitate their control for the purpose of optimizing the desired outcomes. This paper discusses recent advances in the continuing development of the Multiphysics Discrete Element Method (MDEM) for the simulation of AM processes. This particle-based method elegantly encapsulates the relevant physics of powder-based AM processes. In particular, the enrichment of the underlying constitutive behaviors to include thermoplasticity is discussed, as are methodologies for modeling the melting and re-solidification of the feedstock materials. Algorithmic improvements that increase computational performance are also discussed. The MDEM is demonstrated to enable the simulation of the additive manufacture of macro-scale components. Concluding remarks are given on the tasks required for the future development of the MDEM, and the topic of experimental validation is also discussed.

Characterization of CSA cemented-treated sands via discrete element method

2021 ◽  
Author(s):  
Almas Bisserik ◽  
Jong Kim ◽  
Alfrendo Satyanaga ◽  
Sung-Woo Moon
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Element Method

Characterization of the Shear Properties of Hemp Fiber and Core Using the Discrete Element Method

2011 ◽  
Vol 54 (6) ◽  
pp. 2279-2285 ◽  
Author(s):  
M. A. Sadek ◽  
Y. Chen ◽  
C. Laguë ◽  
H. Landry ◽  
Q. Peng ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Discrete Element ◽  
Hemp Fiber ◽  
Shear Properties ◽  
Element Method
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