Journal ArticleDOI
Powder deposition mechanism during powder spreading with different spreader geometries in powder bed fusion additive manufacturing
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TLDR
In this paper, a discrete element method is used to examine the mechanisms determining powder deposition efficiency during powder spreading in powder bed fusion additive manufacturing, and the results reveal that powder flow in the powder pile is critical for the formation and break of transient jamming.About:
This article is published in Powder Technology.The article was published on 2022-01-01. It has received 12 citations till now. The article focuses on the topics: Deposition (geology) & Fusion.read more
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Powder Spreading over Realistic Laser Melted Surfaces in Metal Additive Manufacturing
TL;DR: In this paper , the influence of the substrate surface topography on powder spreading performance over a set of realistic surfaces was investigated and it was found that a finer more cohesive powder can achieve the best layer coverage over realistic surfaces.
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Particle scale modelling of powder recoating and melt pool dynamics in laser powder bed fusion additive manufacturing: A review
TL;DR: In this article , a review on multi-physics related to metal powder recoating and further melting and solidification process is presented, including model theory and validation, effects of process parameters, and physics of particle flow and size segregation.
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Powder spreading and spreadability in the additive manufacturing of metallic materials: a critical review
TL;DR: In this article , a review of powder spreading and spreadability in metal additive manufacturing is presented, focusing on the current progress in understanding spreading dynamics, the role of powder characteristics, the spreading systems and the testing tools developed for assessing powder spreadability.
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Tailoring hydroxyapatite microspheres by spray-drying for powder bed fusion feedstock
TL;DR: In this article , the physical characteristics of stoichiometric hydroxyapatite microspheres produced by spray-drying process through different operating conditions were evaluated by analysing the particle size, shape, moisture, and agglomerates strength.
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Pressure capability analysis of magnetic powder seals and pole tooth design by multiparameter optimization
Zheng-Wen Li,Decai Li +1 more
TL;DR: In this paper , a theoretical analysis of magnetic powder seal performance is given, and a determinant coefficient is put forward to measure the capacity of magnetometer-based magnetic powder sealing.
References
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Journal ArticleDOI
The physics of jamming for granular materials: a review
TL;DR: Experimental studies seeking to understand random loose and random close packings (rlp and rcp) and dating back to Bernal have probed granular packings and their response to shear and intruder motion, suggesting that rlp's are anisotropic and shear-jammed-like, whereas rcp's are likely isotropically jammed states.
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A Review on Functionally Graded Materials and Structures via Additive Manufacturing: From Multi-Scale Design to Versatile Functional Properties
Yan Li,Zuying Feng,Liang Hao,Lijing Huang,Chenxing Xin,Yushen Wang,Emiliano Bilotti,Khamis Essa,Han Zhang,Li Zheng,Feifei Yan,Ton Peijs +11 more
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Contact thermal conductivity of a powder bed in selective laser sintering
TL;DR: In this paper, a model of independent small thermal contacts is proposed to calculate the effective contact conductivity of cubic-symmetry lattices and the random packing of equal spheres.
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Powder-spreading mechanisms in powder-bed-based additive manufacturing: experiments and computational modeling
TL;DR: In this paper, a combined experimental and computational modeling study on the scraping type of powder-spreading process, in order to understand the fundamental mechanisms of the packing of the powder layer, is presented.
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Attractive particle interaction forces and packing density of fine glass powders
Eric J. R. Parteli,Jochen Schmidt,Christina Blümel,Karl-Ernst Wirth,Wolfgang Peukert,Thorsten Pöschel +5 more
TL;DR: This work proposes a mathematical expression to estimate the packing fraction of fine polydisperse powders as a function of the average particle size and suggests that considering only viscoelastic and adhesive forces in DEM simulations may lead to incorrect numerical predictions of the behavior of fine powders.