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Analysis of Nonlinear Shrinkage for the Bound Metal Deposition Manufacturing using Multi-scale ApproachWe consider problem of nonlinear shrinkage of the metal part during bound metal deposition manufacturing on the ground and in zero-G. To analyze this problem we developed multi-scale physics-based approach that spans atomistic dynamics at the scale of nanoseconds and the full part shrinkage at the time scale of hours. Using this approach we estimated
the key parameters of the problem including grain boundary width, coefficient of surface diffusion, initial redistribution of particles during debinding stage, micro-structure evolution from round particles to densely packed grains and corresponding change of the total and chemical free energy, and sintering stress. The introduced method was used to predict shrinkage at the level of two particles, filament cross-section, sub-model, and the whole green, brown, and metal parts. To further improve accuracy and reliability of the shrinkage predictions we propose concept of intelligent additive manufacturing of metal powders in space that combines the strengths of both physics-based and data-driven methods of analysis of AM.
Document ID
20210010310
Document Type
Technical Memorandum (TM)
Authors
Dmitry G Luchinsky (Wyle (United States) El Segundo, California, United States)
Vasyl Hafiychuk (Wyle (United States) El Segundo, California, United States)
Kevin R Wheeler (Ames Research Center Mountain View, California, United States)
Tracie J Prater (Marshall Space Flight Center Redstone Arsenal, Alabama, United States)
Date Acquired
February 18, 2021
Publication Date
March 11, 2021
Publication Information
Subject Category
Numerical Analysis
Report/Patent Number
NASA/TM-20210010310
L-12456
Funding Number(s)
TASK: 15182.03.00.004.001
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
Single Expert
Keywords
bound metal deposition
additive manufacturing
molecular dynamics
discrete element modeling
phase field model
finite element model

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