Analysis of radiation pressure and aerodynamic forces acting on powder grains in powder-based additive manufacturing
Analysis of radiation pressure and aerodynamic forces acting on powder grains in powder-based additive manufacturing
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DOI：
10.1016/j.powtec.2020.04.031
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发表时间：
2020-05
影响因子：
5.2
通讯作者：
S. Haeri;S. Haeri;Jack Hanson;S. Lotfian
中科院分区：
文献类型：
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作者：
S. Haeri;S. Haeri;Jack Hanson;S. Lotfian
工艺参数的选择是金属粉末增材制造（PBAM）的重要步骤。为了实现最佳的参数设置，目前的文献主要集中在通过分析空气动力学的粉末动力学的理解。然而，在这封信中，我们显示的激光诱导力（辐射压力）的粉末动力学的重要性。广义洛伦兹-米氏理论已被用来准确地估计辐射压力，它表明，其幅度是显着的各种空气动力学和晶粒重量相比，因此，可以显着地有助于剥蚀和飞溅在制造过程中观察到的。此外，压缩性和稀疏效应的重要性的阻力和升力的大小，一个颗粒的经验证明通过估计theMaandKnumbers在工艺条件下，这直接影响粉末动力学。
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 theMaandKnnumbers under process conditions, which directly impact the powder dynamics.