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Selection of process parameters is an important step in Powder-Based Additive Manufacturing (PBAM) of metals. In order to achieve an optimal parameter set, current literature is mainly focused on the understanding of powder dynamics by analysing the aerodynamic forces. In this letter, however, we show the importance of the laser induced force (radiation pressure) on the powder dynamics. Generalised Lorenz-Mie theory has been employed to accurately estimate the radiation pressure and it is shown that its magnitude is significant in comparison to various aerodynamic forces and the grains weight, hence, can significantly contribute to denudation and spatter observed in the manufacturing process. Furthermore, the importance of compressibility and rarefaction effects on the magnitude of drag and lift forces that a particle experiences is demonstrated by estimating the Ma and Kn numbers under process conditions, which directly impact the powder dynamics.
- additive manufacturing
- powder bed
- laser radiation pressure
- powder dynamics
Effects of particle elongation on the binary coalescence dynamics of powder grains for Laser sintering applicationsHaeri, S., Benedetti, L. & Ghita, O., 1 Mar 2020, In: Powder Technology. 363, p. 245-255 11 p.
Research output: Contribution to journal › Article › peer-reviewOpen AccessFile7 Citations (Scopus)2 Downloads (Pure)
28 Oct 2019. 1 p.
Research output: Contribution to conference › Abstract › peer-review
Optimisation of blade type spreaders for powder bed preparation in additive manufacturing using DEM simulationsHaeri, S., 30 Nov 2017, In: Powder Technology. 321, p. 94-104 11 p.
Research output: Contribution to journal › Article › peer-reviewOpen AccessFile63 Citations (Scopus)123 Downloads (Pure)