Experimental and Numerical Study on the Packing Densification of Metal Powder with Gaussian Distribution
Abstract
:1. Introduction
2. Test Rig
2.1. Configuration of Test Rig
2.2. Materials in This Experiment
2.3. Experimental Process Design
2.4. The Calculation of Packing Density
3. DEM Simulation
3.1. The Model for Fine Powders
3.2. Establishment of Vibration Model
4. Results and Discussion
4.1. Dependence of Packing Density on Powder Size Distribution
4.1.1. Simulation Result for Larger Powders
4.1.2. Simulation Result for Fine Powders
4.2. The Packing Density of Powder under Vibration
5. Conclusions
- (1)
- The typical powder size of the powder used in 3D printing is less than 100 μm, which belongs to the category of fine powder. Taking into account the influence of van der Waals forces, a mathematical model suitable for fine powder was constructed on the basis of the classical discrete element model. At the same time, considering the influence of vibration on the packing density of powder, the displacement equation of simple harmonic vibration was converted into a velocity equation, and the function of the DEM mathematical model was expanded.
- (2)
- A three-dimensional vibration experimental platform for powder was designed, and the influence of different vibration conditions on the packing density of powder was experimentally studied. The influence of the amplitude and vibration frequency on the powder packing density is the same; that is, it increases with an increase in amplitude or frequency, and then decreases with a further increase in amplitude or frequency after reaching the maximum. This shows that under each vibration condition, there is an optimal amplitude and frequency for achieving the densest packing of powders.
- (3)
- The research results show that the compact structure formed by only relying on vibration intensity characterization is unreasonable. Therefore, it is necessary to combine the amplitude and frequency to analyze the factors that affect the density.
Author Contributions
Funding
Conflicts of Interest
References
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Powder Distribution | Powder Stiffness × e10 (n/m) | ||||||
---|---|---|---|---|---|---|---|
0.05 | 0.1 | 0.5 | 1 | 5 | 8 | 9 | |
AE | 0.175 | 0.255 | 0.348 | 0.351 | 0.364 | 0.367 | 0.368 |
BE | 0.245 | 0.285 | 0.35 | 0.355 | 0.365 | 0.367 | 0.37 |
CE | 0.34 | 0.335 | 0.365 | 0.365 | 0.372 | 0.371 | 0.371 |
AG | 0.13 | 0.221 | 0.302 | 0.351 | 0.339 | 0.341 | 0.342 |
BG | 0.18 | 0.256 | 0.318 | 0.355 | 0.339 | 0.342 | 0.344 |
CG | 0.26 | 0.312 | 0.328 | 0.365 | 0.348 | 0.349 | 0.35 |
AE1 | 0.32 | 0.37 | 0.42 | 0.446 | 0.455 | 0.458 | 0.461 |
BE1 | 0.33 | 0.375 | 0.425 | 0.448 | 0.456 | 0.458 | 0.463 |
CE1 | 0.34 | 0.379 | 0.429 | 0.451 | 0.458 | 0.459 | 0.464 |
AG1 | 0.35 | 0.38 | 0.43 | 0.45 | 0.46 | 0.465 | 0.478 |
BG1 | 0.355 | 0.386 | 0.433 | 0.455 | 0.468 | 0.469 | 0.48 |
CG1 | 0.358 | 0.389 | 0.436 | 0.456 | 0.468 | 0.473 | 0.485 |
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Yang, H.; Li, S.; Li, Z.; Ji, F. Experimental and Numerical Study on the Packing Densification of Metal Powder with Gaussian Distribution. Metals 2020, 10, 1401. https://doi.org/10.3390/met10111401
Yang H, Li S, Li Z, Ji F. Experimental and Numerical Study on the Packing Densification of Metal Powder with Gaussian Distribution. Metals. 2020; 10(11):1401. https://doi.org/10.3390/met10111401
Chicago/Turabian StyleYang, Huadong, Shiguang Li, Zhen Li, and Fengchao Ji. 2020. "Experimental and Numerical Study on the Packing Densification of Metal Powder with Gaussian Distribution" Metals 10, no. 11: 1401. https://doi.org/10.3390/met10111401