Analysis of radiation pressure and aerodynamic forces acting on powder grains in powder-based additive manufacturing

Haeri, Sina and Haeri, Soroush and Hanson, Jack and Lotfian, Saeid (2020) Analysis of radiation pressure and aerodynamic forces acting on powder grains in powder-based additive manufacturing. Powder Technology, 368. pp. 125-129. ISSN 0032-5910

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    Abstract

    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.

    Creators(s): Haeri, Sina ORCID logoORCID: https://orcid.org/0000-0001-8882-4685, Haeri, Soroush, Hanson, Jack and Lotfian, Saeid;
    Item type:Article
    ID code:72188
    Keywords:additive manufacturing, powder bed, laser radiation pressure, powder dynamics, Mechanical engineering and machinery, Chemical Engineering(all), Mechanical Engineering
    Subjects:Technology > Mechanical engineering and machinery
    Department:Strategic Research Themes > Ocean, Air and Space
    Faculty of Engineering > Mechanical and Aerospace Engineering
    Faculty of Engineering > Naval Architecture, Ocean & Marine Engineering
    Depositing user: Pure Administrator
    Date deposited:28 Apr 2020 14:48
    Last modified:05 Jul 2020 21:09
    URI:https://strathprints.strath.ac.uk/id/eprint/72188
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