Numerical simulation of selective laser melting based onSPH method

Abstract

<p indent="0mm">The selective laser melting (SLM) is a common additive manufacturing technology. SLM formation involves complex multiphysical phenomena, such as heat transfer, melting, molten flow, and solidification. The development of a numerical method for modeling multitrack powder melting in SLM has important scientific significance and broad application prospects. In this paper, a powder-scale multiphysics numerical model of molten pool dynamics is established using the SPH method. For the first time, the three-dimensional SPH simulation of multilayer multitrack SLM has been realized. First, a key technique for transforming SPH surface particles into interface meshes is proposed, and the multilayer powder bed is realized. Then, the effects of energy density and laser hatch spacing on molten formation are discussed. The optimal simulation condition of a single layer is obtained and further used in multilayer simulation. This work makes up for the deficiency in SPH simulation of powder-scale metal additive manufacturing and can provide a reliable simulation tool for defect analysis, process optimization, and the correlation between process parameters and product performance.